Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/mm/page_alloc.c | |
3 | * | |
4 | * Manages the free list, the system allocates free pages here. | |
5 | * Note that kmalloc() lives in slab.c | |
6 | * | |
7 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
8 | * Swap reorganised 29.12.95, Stephen Tweedie | |
9 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
10 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 | |
11 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 | |
12 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 | |
13 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 | |
14 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/stddef.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/compiler.h> | |
9f158333 | 24 | #include <linux/kernel.h> |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/suspend.h> | |
27 | #include <linux/pagevec.h> | |
28 | #include <linux/blkdev.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/notifier.h> | |
31 | #include <linux/topology.h> | |
32 | #include <linux/sysctl.h> | |
33 | #include <linux/cpu.h> | |
34 | #include <linux/cpuset.h> | |
bdc8cb98 | 35 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
36 | #include <linux/nodemask.h> |
37 | #include <linux/vmalloc.h> | |
4be38e35 | 38 | #include <linux/mempolicy.h> |
6811378e | 39 | #include <linux/stop_machine.h> |
c713216d MG |
40 | #include <linux/sort.h> |
41 | #include <linux/pfn.h> | |
3fcfab16 | 42 | #include <linux/backing-dev.h> |
933e312e | 43 | #include <linux/fault-inject.h> |
1da177e4 LT |
44 | |
45 | #include <asm/tlbflush.h> | |
ac924c60 | 46 | #include <asm/div64.h> |
1da177e4 LT |
47 | #include "internal.h" |
48 | ||
49 | /* | |
13808910 | 50 | * Array of node states. |
1da177e4 | 51 | */ |
13808910 CL |
52 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
53 | [N_POSSIBLE] = NODE_MASK_ALL, | |
54 | [N_ONLINE] = { { [0] = 1UL } }, | |
55 | #ifndef CONFIG_NUMA | |
56 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
57 | #ifdef CONFIG_HIGHMEM | |
58 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
59 | #endif | |
60 | [N_CPU] = { { [0] = 1UL } }, | |
61 | #endif /* NUMA */ | |
62 | }; | |
63 | EXPORT_SYMBOL(node_states); | |
64 | ||
6c231b7b | 65 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 66 | unsigned long totalreserve_pages __read_mostly; |
1da177e4 | 67 | long nr_swap_pages; |
8ad4b1fb | 68 | int percpu_pagelist_fraction; |
1da177e4 | 69 | |
d9c23400 MG |
70 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
71 | int pageblock_order __read_mostly; | |
72 | #endif | |
73 | ||
d98c7a09 | 74 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 75 | |
1da177e4 LT |
76 | /* |
77 | * results with 256, 32 in the lowmem_reserve sysctl: | |
78 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
79 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
80 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
81 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
82 | * HIGHMEM allocation will (224M+784M)/256 of ram reserved in ZONE_DMA | |
a2f1b424 AK |
83 | * |
84 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
85 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 86 | */ |
2f1b6248 | 87 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 88 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 89 | 256, |
4b51d669 | 90 | #endif |
fb0e7942 | 91 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 92 | 256, |
fb0e7942 | 93 | #endif |
e53ef38d | 94 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 95 | 32, |
e53ef38d | 96 | #endif |
2a1e274a | 97 | 32, |
2f1b6248 | 98 | }; |
1da177e4 LT |
99 | |
100 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 101 | |
15ad7cdc | 102 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 103 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 104 | "DMA", |
4b51d669 | 105 | #endif |
fb0e7942 | 106 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 107 | "DMA32", |
fb0e7942 | 108 | #endif |
2f1b6248 | 109 | "Normal", |
e53ef38d | 110 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 111 | "HighMem", |
e53ef38d | 112 | #endif |
2a1e274a | 113 | "Movable", |
2f1b6248 CL |
114 | }; |
115 | ||
1da177e4 LT |
116 | int min_free_kbytes = 1024; |
117 | ||
86356ab1 YG |
118 | unsigned long __meminitdata nr_kernel_pages; |
119 | unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 120 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 121 | |
c713216d MG |
122 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
123 | /* | |
124 | * MAX_ACTIVE_REGIONS determines the maxmimum number of distinct | |
125 | * ranges of memory (RAM) that may be registered with add_active_range(). | |
126 | * Ranges passed to add_active_range() will be merged if possible | |
127 | * so the number of times add_active_range() can be called is | |
128 | * related to the number of nodes and the number of holes | |
129 | */ | |
130 | #ifdef CONFIG_MAX_ACTIVE_REGIONS | |
131 | /* Allow an architecture to set MAX_ACTIVE_REGIONS to save memory */ | |
132 | #define MAX_ACTIVE_REGIONS CONFIG_MAX_ACTIVE_REGIONS | |
133 | #else | |
134 | #if MAX_NUMNODES >= 32 | |
135 | /* If there can be many nodes, allow up to 50 holes per node */ | |
136 | #define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50) | |
137 | #else | |
138 | /* By default, allow up to 256 distinct regions */ | |
139 | #define MAX_ACTIVE_REGIONS 256 | |
140 | #endif | |
141 | #endif | |
142 | ||
98011f56 JB |
143 | static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS]; |
144 | static int __meminitdata nr_nodemap_entries; | |
145 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
146 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
fb01439c | 147 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE |
98011f56 JB |
148 | static unsigned long __meminitdata node_boundary_start_pfn[MAX_NUMNODES]; |
149 | static unsigned long __meminitdata node_boundary_end_pfn[MAX_NUMNODES]; | |
fb01439c | 150 | #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */ |
2a1e274a | 151 | unsigned long __initdata required_kernelcore; |
484f51f8 | 152 | static unsigned long __initdata required_movablecore; |
e228929b | 153 | unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; |
2a1e274a MG |
154 | |
155 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
156 | int movable_zone; | |
157 | EXPORT_SYMBOL(movable_zone); | |
c713216d MG |
158 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
159 | ||
418508c1 MS |
160 | #if MAX_NUMNODES > 1 |
161 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
162 | EXPORT_SYMBOL(nr_node_ids); | |
163 | #endif | |
164 | ||
9ef9acb0 MG |
165 | int page_group_by_mobility_disabled __read_mostly; |
166 | ||
b2a0ac88 MG |
167 | static void set_pageblock_migratetype(struct page *page, int migratetype) |
168 | { | |
169 | set_pageblock_flags_group(page, (unsigned long)migratetype, | |
170 | PB_migrate, PB_migrate_end); | |
171 | } | |
172 | ||
13e7444b | 173 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 174 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 175 | { |
bdc8cb98 DH |
176 | int ret = 0; |
177 | unsigned seq; | |
178 | unsigned long pfn = page_to_pfn(page); | |
c6a57e19 | 179 | |
bdc8cb98 DH |
180 | do { |
181 | seq = zone_span_seqbegin(zone); | |
182 | if (pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
183 | ret = 1; | |
184 | else if (pfn < zone->zone_start_pfn) | |
185 | ret = 1; | |
186 | } while (zone_span_seqretry(zone, seq)); | |
187 | ||
188 | return ret; | |
c6a57e19 DH |
189 | } |
190 | ||
191 | static int page_is_consistent(struct zone *zone, struct page *page) | |
192 | { | |
14e07298 | 193 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 194 | return 0; |
1da177e4 | 195 | if (zone != page_zone(page)) |
c6a57e19 DH |
196 | return 0; |
197 | ||
198 | return 1; | |
199 | } | |
200 | /* | |
201 | * Temporary debugging check for pages not lying within a given zone. | |
202 | */ | |
203 | static int bad_range(struct zone *zone, struct page *page) | |
204 | { | |
205 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 206 | return 1; |
c6a57e19 DH |
207 | if (!page_is_consistent(zone, page)) |
208 | return 1; | |
209 | ||
1da177e4 LT |
210 | return 0; |
211 | } | |
13e7444b NP |
212 | #else |
213 | static inline int bad_range(struct zone *zone, struct page *page) | |
214 | { | |
215 | return 0; | |
216 | } | |
217 | #endif | |
218 | ||
224abf92 | 219 | static void bad_page(struct page *page) |
1da177e4 | 220 | { |
224abf92 | 221 | printk(KERN_EMERG "Bad page state in process '%s'\n" |
7365f3d1 HD |
222 | KERN_EMERG "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n" |
223 | KERN_EMERG "Trying to fix it up, but a reboot is needed\n" | |
224 | KERN_EMERG "Backtrace:\n", | |
224abf92 NP |
225 | current->comm, page, (int)(2*sizeof(unsigned long)), |
226 | (unsigned long)page->flags, page->mapping, | |
227 | page_mapcount(page), page_count(page)); | |
1da177e4 | 228 | dump_stack(); |
334795ec HD |
229 | page->flags &= ~(1 << PG_lru | |
230 | 1 << PG_private | | |
1da177e4 | 231 | 1 << PG_locked | |
1da177e4 LT |
232 | 1 << PG_active | |
233 | 1 << PG_dirty | | |
334795ec HD |
234 | 1 << PG_reclaim | |
235 | 1 << PG_slab | | |
1da177e4 | 236 | 1 << PG_swapcache | |
676165a8 NP |
237 | 1 << PG_writeback | |
238 | 1 << PG_buddy ); | |
1da177e4 LT |
239 | set_page_count(page, 0); |
240 | reset_page_mapcount(page); | |
241 | page->mapping = NULL; | |
9f158333 | 242 | add_taint(TAINT_BAD_PAGE); |
1da177e4 LT |
243 | } |
244 | ||
1da177e4 LT |
245 | /* |
246 | * Higher-order pages are called "compound pages". They are structured thusly: | |
247 | * | |
248 | * The first PAGE_SIZE page is called the "head page". | |
249 | * | |
250 | * The remaining PAGE_SIZE pages are called "tail pages". | |
251 | * | |
252 | * All pages have PG_compound set. All pages have their ->private pointing at | |
253 | * the head page (even the head page has this). | |
254 | * | |
41d78ba5 HD |
255 | * The first tail page's ->lru.next holds the address of the compound page's |
256 | * put_page() function. Its ->lru.prev holds the order of allocation. | |
257 | * This usage means that zero-order pages may not be compound. | |
1da177e4 | 258 | */ |
d98c7a09 HD |
259 | |
260 | static void free_compound_page(struct page *page) | |
261 | { | |
d85f3385 | 262 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
263 | } |
264 | ||
1da177e4 LT |
265 | static void prep_compound_page(struct page *page, unsigned long order) |
266 | { | |
267 | int i; | |
268 | int nr_pages = 1 << order; | |
269 | ||
33f2ef89 | 270 | set_compound_page_dtor(page, free_compound_page); |
d85f3385 | 271 | set_compound_order(page, order); |
6d777953 | 272 | __SetPageHead(page); |
d85f3385 | 273 | for (i = 1; i < nr_pages; i++) { |
1da177e4 LT |
274 | struct page *p = page + i; |
275 | ||
d85f3385 | 276 | __SetPageTail(p); |
d85f3385 | 277 | p->first_page = page; |
1da177e4 LT |
278 | } |
279 | } | |
280 | ||
281 | static void destroy_compound_page(struct page *page, unsigned long order) | |
282 | { | |
283 | int i; | |
284 | int nr_pages = 1 << order; | |
285 | ||
d85f3385 | 286 | if (unlikely(compound_order(page) != order)) |
224abf92 | 287 | bad_page(page); |
1da177e4 | 288 | |
6d777953 | 289 | if (unlikely(!PageHead(page))) |
d85f3385 | 290 | bad_page(page); |
6d777953 | 291 | __ClearPageHead(page); |
d85f3385 | 292 | for (i = 1; i < nr_pages; i++) { |
1da177e4 LT |
293 | struct page *p = page + i; |
294 | ||
6d777953 | 295 | if (unlikely(!PageTail(p) | |
d85f3385 | 296 | (p->first_page != page))) |
224abf92 | 297 | bad_page(page); |
d85f3385 | 298 | __ClearPageTail(p); |
1da177e4 LT |
299 | } |
300 | } | |
1da177e4 | 301 | |
17cf4406 NP |
302 | static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) |
303 | { | |
304 | int i; | |
305 | ||
725d704e | 306 | VM_BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM); |
6626c5d5 AM |
307 | /* |
308 | * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO | |
309 | * and __GFP_HIGHMEM from hard or soft interrupt context. | |
310 | */ | |
725d704e | 311 | VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt()); |
17cf4406 NP |
312 | for (i = 0; i < (1 << order); i++) |
313 | clear_highpage(page + i); | |
314 | } | |
315 | ||
6aa3001b AM |
316 | static inline void set_page_order(struct page *page, int order) |
317 | { | |
4c21e2f2 | 318 | set_page_private(page, order); |
676165a8 | 319 | __SetPageBuddy(page); |
1da177e4 LT |
320 | } |
321 | ||
322 | static inline void rmv_page_order(struct page *page) | |
323 | { | |
676165a8 | 324 | __ClearPageBuddy(page); |
4c21e2f2 | 325 | set_page_private(page, 0); |
1da177e4 LT |
326 | } |
327 | ||
328 | /* | |
329 | * Locate the struct page for both the matching buddy in our | |
330 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
331 | * | |
332 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
333 | * the following equation: | |
334 | * B2 = B1 ^ (1 << O) | |
335 | * For example, if the starting buddy (buddy2) is #8 its order | |
336 | * 1 buddy is #10: | |
337 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
338 | * | |
339 | * 2) Any buddy B will have an order O+1 parent P which | |
340 | * satisfies the following equation: | |
341 | * P = B & ~(1 << O) | |
342 | * | |
d6e05edc | 343 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER |
1da177e4 LT |
344 | */ |
345 | static inline struct page * | |
346 | __page_find_buddy(struct page *page, unsigned long page_idx, unsigned int order) | |
347 | { | |
348 | unsigned long buddy_idx = page_idx ^ (1 << order); | |
349 | ||
350 | return page + (buddy_idx - page_idx); | |
351 | } | |
352 | ||
353 | static inline unsigned long | |
354 | __find_combined_index(unsigned long page_idx, unsigned int order) | |
355 | { | |
356 | return (page_idx & ~(1 << order)); | |
357 | } | |
358 | ||
359 | /* | |
360 | * This function checks whether a page is free && is the buddy | |
361 | * we can do coalesce a page and its buddy if | |
13e7444b | 362 | * (a) the buddy is not in a hole && |
676165a8 | 363 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
364 | * (c) a page and its buddy have the same order && |
365 | * (d) a page and its buddy are in the same zone. | |
676165a8 NP |
366 | * |
367 | * For recording whether a page is in the buddy system, we use PG_buddy. | |
368 | * Setting, clearing, and testing PG_buddy is serialized by zone->lock. | |
1da177e4 | 369 | * |
676165a8 | 370 | * For recording page's order, we use page_private(page). |
1da177e4 | 371 | */ |
cb2b95e1 AW |
372 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
373 | int order) | |
1da177e4 | 374 | { |
14e07298 | 375 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 376 | return 0; |
13e7444b | 377 | |
cb2b95e1 AW |
378 | if (page_zone_id(page) != page_zone_id(buddy)) |
379 | return 0; | |
380 | ||
381 | if (PageBuddy(buddy) && page_order(buddy) == order) { | |
382 | BUG_ON(page_count(buddy) != 0); | |
6aa3001b | 383 | return 1; |
676165a8 | 384 | } |
6aa3001b | 385 | return 0; |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
389 | * Freeing function for a buddy system allocator. | |
390 | * | |
391 | * The concept of a buddy system is to maintain direct-mapped table | |
392 | * (containing bit values) for memory blocks of various "orders". | |
393 | * The bottom level table contains the map for the smallest allocatable | |
394 | * units of memory (here, pages), and each level above it describes | |
395 | * pairs of units from the levels below, hence, "buddies". | |
396 | * At a high level, all that happens here is marking the table entry | |
397 | * at the bottom level available, and propagating the changes upward | |
398 | * as necessary, plus some accounting needed to play nicely with other | |
399 | * parts of the VM system. | |
400 | * At each level, we keep a list of pages, which are heads of continuous | |
676165a8 | 401 | * free pages of length of (1 << order) and marked with PG_buddy. Page's |
4c21e2f2 | 402 | * order is recorded in page_private(page) field. |
1da177e4 LT |
403 | * So when we are allocating or freeing one, we can derive the state of the |
404 | * other. That is, if we allocate a small block, and both were | |
405 | * free, the remainder of the region must be split into blocks. | |
406 | * If a block is freed, and its buddy is also free, then this | |
407 | * triggers coalescing into a block of larger size. | |
408 | * | |
409 | * -- wli | |
410 | */ | |
411 | ||
48db57f8 | 412 | static inline void __free_one_page(struct page *page, |
1da177e4 LT |
413 | struct zone *zone, unsigned int order) |
414 | { | |
415 | unsigned long page_idx; | |
416 | int order_size = 1 << order; | |
b2a0ac88 | 417 | int migratetype = get_pageblock_migratetype(page); |
1da177e4 | 418 | |
224abf92 | 419 | if (unlikely(PageCompound(page))) |
1da177e4 LT |
420 | destroy_compound_page(page, order); |
421 | ||
422 | page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1); | |
423 | ||
725d704e NP |
424 | VM_BUG_ON(page_idx & (order_size - 1)); |
425 | VM_BUG_ON(bad_range(zone, page)); | |
1da177e4 | 426 | |
d23ad423 | 427 | __mod_zone_page_state(zone, NR_FREE_PAGES, order_size); |
1da177e4 LT |
428 | while (order < MAX_ORDER-1) { |
429 | unsigned long combined_idx; | |
1da177e4 LT |
430 | struct page *buddy; |
431 | ||
1da177e4 | 432 | buddy = __page_find_buddy(page, page_idx, order); |
cb2b95e1 | 433 | if (!page_is_buddy(page, buddy, order)) |
1da177e4 | 434 | break; /* Move the buddy up one level. */ |
13e7444b | 435 | |
1da177e4 | 436 | list_del(&buddy->lru); |
b2a0ac88 | 437 | zone->free_area[order].nr_free--; |
1da177e4 | 438 | rmv_page_order(buddy); |
13e7444b | 439 | combined_idx = __find_combined_index(page_idx, order); |
1da177e4 LT |
440 | page = page + (combined_idx - page_idx); |
441 | page_idx = combined_idx; | |
442 | order++; | |
443 | } | |
444 | set_page_order(page, order); | |
b2a0ac88 MG |
445 | list_add(&page->lru, |
446 | &zone->free_area[order].free_list[migratetype]); | |
1da177e4 LT |
447 | zone->free_area[order].nr_free++; |
448 | } | |
449 | ||
224abf92 | 450 | static inline int free_pages_check(struct page *page) |
1da177e4 | 451 | { |
92be2e33 NP |
452 | if (unlikely(page_mapcount(page) | |
453 | (page->mapping != NULL) | | |
454 | (page_count(page) != 0) | | |
1da177e4 LT |
455 | (page->flags & ( |
456 | 1 << PG_lru | | |
457 | 1 << PG_private | | |
458 | 1 << PG_locked | | |
459 | 1 << PG_active | | |
1da177e4 LT |
460 | 1 << PG_slab | |
461 | 1 << PG_swapcache | | |
b5810039 | 462 | 1 << PG_writeback | |
676165a8 NP |
463 | 1 << PG_reserved | |
464 | 1 << PG_buddy )))) | |
224abf92 | 465 | bad_page(page); |
1da177e4 | 466 | if (PageDirty(page)) |
242e5468 | 467 | __ClearPageDirty(page); |
689bcebf HD |
468 | /* |
469 | * For now, we report if PG_reserved was found set, but do not | |
470 | * clear it, and do not free the page. But we shall soon need | |
471 | * to do more, for when the ZERO_PAGE count wraps negative. | |
472 | */ | |
473 | return PageReserved(page); | |
1da177e4 LT |
474 | } |
475 | ||
476 | /* | |
477 | * Frees a list of pages. | |
478 | * Assumes all pages on list are in same zone, and of same order. | |
207f36ee | 479 | * count is the number of pages to free. |
1da177e4 LT |
480 | * |
481 | * If the zone was previously in an "all pages pinned" state then look to | |
482 | * see if this freeing clears that state. | |
483 | * | |
484 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
485 | * pinned" detection logic. | |
486 | */ | |
48db57f8 NP |
487 | static void free_pages_bulk(struct zone *zone, int count, |
488 | struct list_head *list, int order) | |
1da177e4 | 489 | { |
c54ad30c | 490 | spin_lock(&zone->lock); |
1da177e4 LT |
491 | zone->all_unreclaimable = 0; |
492 | zone->pages_scanned = 0; | |
48db57f8 NP |
493 | while (count--) { |
494 | struct page *page; | |
495 | ||
725d704e | 496 | VM_BUG_ON(list_empty(list)); |
1da177e4 | 497 | page = list_entry(list->prev, struct page, lru); |
48db57f8 | 498 | /* have to delete it as __free_one_page list manipulates */ |
1da177e4 | 499 | list_del(&page->lru); |
48db57f8 | 500 | __free_one_page(page, zone, order); |
1da177e4 | 501 | } |
c54ad30c | 502 | spin_unlock(&zone->lock); |
1da177e4 LT |
503 | } |
504 | ||
48db57f8 | 505 | static void free_one_page(struct zone *zone, struct page *page, int order) |
1da177e4 | 506 | { |
006d22d9 CL |
507 | spin_lock(&zone->lock); |
508 | zone->all_unreclaimable = 0; | |
509 | zone->pages_scanned = 0; | |
0798e519 | 510 | __free_one_page(page, zone, order); |
006d22d9 | 511 | spin_unlock(&zone->lock); |
48db57f8 NP |
512 | } |
513 | ||
514 | static void __free_pages_ok(struct page *page, unsigned int order) | |
515 | { | |
516 | unsigned long flags; | |
1da177e4 | 517 | int i; |
689bcebf | 518 | int reserved = 0; |
1da177e4 | 519 | |
1da177e4 | 520 | for (i = 0 ; i < (1 << order) ; ++i) |
224abf92 | 521 | reserved += free_pages_check(page + i); |
689bcebf HD |
522 | if (reserved) |
523 | return; | |
524 | ||
9858db50 NP |
525 | if (!PageHighMem(page)) |
526 | debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order); | |
dafb1367 | 527 | arch_free_page(page, order); |
48db57f8 | 528 | kernel_map_pages(page, 1 << order, 0); |
dafb1367 | 529 | |
c54ad30c | 530 | local_irq_save(flags); |
f8891e5e | 531 | __count_vm_events(PGFREE, 1 << order); |
48db57f8 | 532 | free_one_page(page_zone(page), page, order); |
c54ad30c | 533 | local_irq_restore(flags); |
1da177e4 LT |
534 | } |
535 | ||
a226f6c8 DH |
536 | /* |
537 | * permit the bootmem allocator to evade page validation on high-order frees | |
538 | */ | |
539 | void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order) | |
540 | { | |
541 | if (order == 0) { | |
542 | __ClearPageReserved(page); | |
543 | set_page_count(page, 0); | |
7835e98b | 544 | set_page_refcounted(page); |
545b1ea9 | 545 | __free_page(page); |
a226f6c8 | 546 | } else { |
a226f6c8 DH |
547 | int loop; |
548 | ||
545b1ea9 | 549 | prefetchw(page); |
a226f6c8 DH |
550 | for (loop = 0; loop < BITS_PER_LONG; loop++) { |
551 | struct page *p = &page[loop]; | |
552 | ||
545b1ea9 NP |
553 | if (loop + 1 < BITS_PER_LONG) |
554 | prefetchw(p + 1); | |
a226f6c8 DH |
555 | __ClearPageReserved(p); |
556 | set_page_count(p, 0); | |
557 | } | |
558 | ||
7835e98b | 559 | set_page_refcounted(page); |
545b1ea9 | 560 | __free_pages(page, order); |
a226f6c8 DH |
561 | } |
562 | } | |
563 | ||
1da177e4 LT |
564 | |
565 | /* | |
566 | * The order of subdivision here is critical for the IO subsystem. | |
567 | * Please do not alter this order without good reasons and regression | |
568 | * testing. Specifically, as large blocks of memory are subdivided, | |
569 | * the order in which smaller blocks are delivered depends on the order | |
570 | * they're subdivided in this function. This is the primary factor | |
571 | * influencing the order in which pages are delivered to the IO | |
572 | * subsystem according to empirical testing, and this is also justified | |
573 | * by considering the behavior of a buddy system containing a single | |
574 | * large block of memory acted on by a series of small allocations. | |
575 | * This behavior is a critical factor in sglist merging's success. | |
576 | * | |
577 | * -- wli | |
578 | */ | |
085cc7d5 | 579 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
580 | int low, int high, struct free_area *area, |
581 | int migratetype) | |
1da177e4 LT |
582 | { |
583 | unsigned long size = 1 << high; | |
584 | ||
585 | while (high > low) { | |
586 | area--; | |
587 | high--; | |
588 | size >>= 1; | |
725d704e | 589 | VM_BUG_ON(bad_range(zone, &page[size])); |
b2a0ac88 | 590 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
591 | area->nr_free++; |
592 | set_page_order(&page[size], high); | |
593 | } | |
1da177e4 LT |
594 | } |
595 | ||
1da177e4 LT |
596 | /* |
597 | * This page is about to be returned from the page allocator | |
598 | */ | |
17cf4406 | 599 | static int prep_new_page(struct page *page, int order, gfp_t gfp_flags) |
1da177e4 | 600 | { |
92be2e33 NP |
601 | if (unlikely(page_mapcount(page) | |
602 | (page->mapping != NULL) | | |
603 | (page_count(page) != 0) | | |
334795ec HD |
604 | (page->flags & ( |
605 | 1 << PG_lru | | |
1da177e4 LT |
606 | 1 << PG_private | |
607 | 1 << PG_locked | | |
1da177e4 LT |
608 | 1 << PG_active | |
609 | 1 << PG_dirty | | |
334795ec | 610 | 1 << PG_slab | |
1da177e4 | 611 | 1 << PG_swapcache | |
b5810039 | 612 | 1 << PG_writeback | |
676165a8 NP |
613 | 1 << PG_reserved | |
614 | 1 << PG_buddy )))) | |
224abf92 | 615 | bad_page(page); |
1da177e4 | 616 | |
689bcebf HD |
617 | /* |
618 | * For now, we report if PG_reserved was found set, but do not | |
619 | * clear it, and do not allocate the page: as a safety net. | |
620 | */ | |
621 | if (PageReserved(page)) | |
622 | return 1; | |
623 | ||
d77c2d7c | 624 | page->flags &= ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_readahead | |
1da177e4 | 625 | 1 << PG_referenced | 1 << PG_arch_1 | |
5409bae0 | 626 | 1 << PG_owner_priv_1 | 1 << PG_mappedtodisk); |
4c21e2f2 | 627 | set_page_private(page, 0); |
7835e98b | 628 | set_page_refcounted(page); |
cc102509 NP |
629 | |
630 | arch_alloc_page(page, order); | |
1da177e4 | 631 | kernel_map_pages(page, 1 << order, 1); |
17cf4406 NP |
632 | |
633 | if (gfp_flags & __GFP_ZERO) | |
634 | prep_zero_page(page, order, gfp_flags); | |
635 | ||
636 | if (order && (gfp_flags & __GFP_COMP)) | |
637 | prep_compound_page(page, order); | |
638 | ||
689bcebf | 639 | return 0; |
1da177e4 LT |
640 | } |
641 | ||
56fd56b8 MG |
642 | /* |
643 | * Go through the free lists for the given migratetype and remove | |
644 | * the smallest available page from the freelists | |
645 | */ | |
646 | static struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
647 | int migratetype) | |
648 | { | |
649 | unsigned int current_order; | |
650 | struct free_area * area; | |
651 | struct page *page; | |
652 | ||
653 | /* Find a page of the appropriate size in the preferred list */ | |
654 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
655 | area = &(zone->free_area[current_order]); | |
656 | if (list_empty(&area->free_list[migratetype])) | |
657 | continue; | |
658 | ||
659 | page = list_entry(area->free_list[migratetype].next, | |
660 | struct page, lru); | |
661 | list_del(&page->lru); | |
662 | rmv_page_order(page); | |
663 | area->nr_free--; | |
664 | __mod_zone_page_state(zone, NR_FREE_PAGES, - (1UL << order)); | |
665 | expand(zone, page, order, current_order, area, migratetype); | |
666 | return page; | |
667 | } | |
668 | ||
669 | return NULL; | |
670 | } | |
671 | ||
672 | ||
b2a0ac88 MG |
673 | /* |
674 | * This array describes the order lists are fallen back to when | |
675 | * the free lists for the desirable migrate type are depleted | |
676 | */ | |
677 | static int fallbacks[MIGRATE_TYPES][MIGRATE_TYPES-1] = { | |
64c5e135 MG |
678 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, |
679 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, | |
680 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }, | |
681 | [MIGRATE_RESERVE] = { MIGRATE_RESERVE, MIGRATE_RESERVE, MIGRATE_RESERVE }, /* Never used */ | |
b2a0ac88 MG |
682 | }; |
683 | ||
c361be55 MG |
684 | /* |
685 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 686 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
687 | * boundary. If alignment is required, use move_freepages_block() |
688 | */ | |
689 | int move_freepages(struct zone *zone, | |
690 | struct page *start_page, struct page *end_page, | |
691 | int migratetype) | |
692 | { | |
693 | struct page *page; | |
694 | unsigned long order; | |
d100313f | 695 | int pages_moved = 0; |
c361be55 MG |
696 | |
697 | #ifndef CONFIG_HOLES_IN_ZONE | |
698 | /* | |
699 | * page_zone is not safe to call in this context when | |
700 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
701 | * anyway as we check zone boundaries in move_freepages_block(). | |
702 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 703 | * grouping pages by mobility |
c361be55 MG |
704 | */ |
705 | BUG_ON(page_zone(start_page) != page_zone(end_page)); | |
706 | #endif | |
707 | ||
708 | for (page = start_page; page <= end_page;) { | |
709 | if (!pfn_valid_within(page_to_pfn(page))) { | |
710 | page++; | |
711 | continue; | |
712 | } | |
713 | ||
714 | if (!PageBuddy(page)) { | |
715 | page++; | |
716 | continue; | |
717 | } | |
718 | ||
719 | order = page_order(page); | |
720 | list_del(&page->lru); | |
721 | list_add(&page->lru, | |
722 | &zone->free_area[order].free_list[migratetype]); | |
723 | page += 1 << order; | |
d100313f | 724 | pages_moved += 1 << order; |
c361be55 MG |
725 | } |
726 | ||
d100313f | 727 | return pages_moved; |
c361be55 MG |
728 | } |
729 | ||
730 | int move_freepages_block(struct zone *zone, struct page *page, int migratetype) | |
731 | { | |
732 | unsigned long start_pfn, end_pfn; | |
733 | struct page *start_page, *end_page; | |
734 | ||
735 | start_pfn = page_to_pfn(page); | |
d9c23400 | 736 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 737 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
738 | end_page = start_page + pageblock_nr_pages - 1; |
739 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
740 | |
741 | /* Do not cross zone boundaries */ | |
742 | if (start_pfn < zone->zone_start_pfn) | |
743 | start_page = page; | |
744 | if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
745 | return 0; | |
746 | ||
747 | return move_freepages(zone, start_page, end_page, migratetype); | |
748 | } | |
749 | ||
5adc5be7 MG |
750 | /* Return the page with the lowest PFN in the list */ |
751 | static struct page *min_page(struct list_head *list) | |
752 | { | |
753 | unsigned long min_pfn = -1UL; | |
754 | struct page *min_page = NULL, *page;; | |
755 | ||
756 | list_for_each_entry(page, list, lru) { | |
757 | unsigned long pfn = page_to_pfn(page); | |
758 | if (pfn < min_pfn) { | |
759 | min_pfn = pfn; | |
760 | min_page = page; | |
761 | } | |
762 | } | |
763 | ||
764 | return min_page; | |
765 | } | |
766 | ||
b2a0ac88 MG |
767 | /* Remove an element from the buddy allocator from the fallback list */ |
768 | static struct page *__rmqueue_fallback(struct zone *zone, int order, | |
769 | int start_migratetype) | |
770 | { | |
771 | struct free_area * area; | |
772 | int current_order; | |
773 | struct page *page; | |
774 | int migratetype, i; | |
775 | ||
776 | /* Find the largest possible block of pages in the other list */ | |
777 | for (current_order = MAX_ORDER-1; current_order >= order; | |
778 | --current_order) { | |
779 | for (i = 0; i < MIGRATE_TYPES - 1; i++) { | |
780 | migratetype = fallbacks[start_migratetype][i]; | |
781 | ||
56fd56b8 MG |
782 | /* MIGRATE_RESERVE handled later if necessary */ |
783 | if (migratetype == MIGRATE_RESERVE) | |
784 | continue; | |
e010487d | 785 | |
b2a0ac88 MG |
786 | area = &(zone->free_area[current_order]); |
787 | if (list_empty(&area->free_list[migratetype])) | |
788 | continue; | |
789 | ||
5adc5be7 | 790 | /* Bias kernel allocations towards low pfns */ |
b2a0ac88 MG |
791 | page = list_entry(area->free_list[migratetype].next, |
792 | struct page, lru); | |
5adc5be7 MG |
793 | if (unlikely(start_migratetype != MIGRATE_MOVABLE)) |
794 | page = min_page(&area->free_list[migratetype]); | |
b2a0ac88 MG |
795 | area->nr_free--; |
796 | ||
797 | /* | |
c361be55 | 798 | * If breaking a large block of pages, move all free |
46dafbca MG |
799 | * pages to the preferred allocation list. If falling |
800 | * back for a reclaimable kernel allocation, be more | |
801 | * agressive about taking ownership of free pages | |
b2a0ac88 | 802 | */ |
d9c23400 | 803 | if (unlikely(current_order >= (pageblock_order >> 1)) || |
46dafbca MG |
804 | start_migratetype == MIGRATE_RECLAIMABLE) { |
805 | unsigned long pages; | |
806 | pages = move_freepages_block(zone, page, | |
807 | start_migratetype); | |
808 | ||
809 | /* Claim the whole block if over half of it is free */ | |
d9c23400 | 810 | if (pages >= (1 << (pageblock_order-1))) |
46dafbca MG |
811 | set_pageblock_migratetype(page, |
812 | start_migratetype); | |
813 | ||
b2a0ac88 | 814 | migratetype = start_migratetype; |
c361be55 | 815 | } |
b2a0ac88 MG |
816 | |
817 | /* Remove the page from the freelists */ | |
818 | list_del(&page->lru); | |
819 | rmv_page_order(page); | |
820 | __mod_zone_page_state(zone, NR_FREE_PAGES, | |
821 | -(1UL << order)); | |
822 | ||
d9c23400 | 823 | if (current_order == pageblock_order) |
b2a0ac88 MG |
824 | set_pageblock_migratetype(page, |
825 | start_migratetype); | |
826 | ||
827 | expand(zone, page, order, current_order, area, migratetype); | |
828 | return page; | |
829 | } | |
830 | } | |
831 | ||
56fd56b8 MG |
832 | /* Use MIGRATE_RESERVE rather than fail an allocation */ |
833 | return __rmqueue_smallest(zone, order, MIGRATE_RESERVE); | |
b2a0ac88 MG |
834 | } |
835 | ||
56fd56b8 | 836 | /* |
1da177e4 LT |
837 | * Do the hard work of removing an element from the buddy allocator. |
838 | * Call me with the zone->lock already held. | |
839 | */ | |
b2a0ac88 MG |
840 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
841 | int migratetype) | |
1da177e4 | 842 | { |
1da177e4 LT |
843 | struct page *page; |
844 | ||
56fd56b8 | 845 | page = __rmqueue_smallest(zone, order, migratetype); |
b2a0ac88 | 846 | |
56fd56b8 MG |
847 | if (unlikely(!page)) |
848 | page = __rmqueue_fallback(zone, order, migratetype); | |
b2a0ac88 MG |
849 | |
850 | return page; | |
1da177e4 LT |
851 | } |
852 | ||
853 | /* | |
854 | * Obtain a specified number of elements from the buddy allocator, all under | |
855 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
856 | * Returns the number of new pages which were placed at *list. | |
857 | */ | |
858 | static int rmqueue_bulk(struct zone *zone, unsigned int order, | |
b2a0ac88 MG |
859 | unsigned long count, struct list_head *list, |
860 | int migratetype) | |
1da177e4 | 861 | { |
1da177e4 | 862 | int i; |
1da177e4 | 863 | |
c54ad30c | 864 | spin_lock(&zone->lock); |
1da177e4 | 865 | for (i = 0; i < count; ++i) { |
b2a0ac88 | 866 | struct page *page = __rmqueue(zone, order, migratetype); |
085cc7d5 | 867 | if (unlikely(page == NULL)) |
1da177e4 | 868 | break; |
535131e6 MG |
869 | list_add(&page->lru, list); |
870 | set_page_private(page, migratetype); | |
1da177e4 | 871 | } |
c54ad30c | 872 | spin_unlock(&zone->lock); |
085cc7d5 | 873 | return i; |
1da177e4 LT |
874 | } |
875 | ||
4ae7c039 | 876 | #ifdef CONFIG_NUMA |
8fce4d8e | 877 | /* |
4037d452 CL |
878 | * Called from the vmstat counter updater to drain pagesets of this |
879 | * currently executing processor on remote nodes after they have | |
880 | * expired. | |
881 | * | |
879336c3 CL |
882 | * Note that this function must be called with the thread pinned to |
883 | * a single processor. | |
8fce4d8e | 884 | */ |
4037d452 | 885 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 886 | { |
4ae7c039 | 887 | unsigned long flags; |
4037d452 | 888 | int to_drain; |
4ae7c039 | 889 | |
4037d452 CL |
890 | local_irq_save(flags); |
891 | if (pcp->count >= pcp->batch) | |
892 | to_drain = pcp->batch; | |
893 | else | |
894 | to_drain = pcp->count; | |
895 | free_pages_bulk(zone, to_drain, &pcp->list, 0); | |
896 | pcp->count -= to_drain; | |
897 | local_irq_restore(flags); | |
4ae7c039 CL |
898 | } |
899 | #endif | |
900 | ||
1da177e4 LT |
901 | static void __drain_pages(unsigned int cpu) |
902 | { | |
c54ad30c | 903 | unsigned long flags; |
1da177e4 LT |
904 | struct zone *zone; |
905 | int i; | |
906 | ||
907 | for_each_zone(zone) { | |
908 | struct per_cpu_pageset *pset; | |
909 | ||
f2e12bb2 CL |
910 | if (!populated_zone(zone)) |
911 | continue; | |
912 | ||
e7c8d5c9 | 913 | pset = zone_pcp(zone, cpu); |
1da177e4 LT |
914 | for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
915 | struct per_cpu_pages *pcp; | |
916 | ||
917 | pcp = &pset->pcp[i]; | |
c54ad30c | 918 | local_irq_save(flags); |
48db57f8 NP |
919 | free_pages_bulk(zone, pcp->count, &pcp->list, 0); |
920 | pcp->count = 0; | |
c54ad30c | 921 | local_irq_restore(flags); |
1da177e4 LT |
922 | } |
923 | } | |
924 | } | |
1da177e4 | 925 | |
296699de | 926 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
927 | |
928 | void mark_free_pages(struct zone *zone) | |
929 | { | |
f623f0db RW |
930 | unsigned long pfn, max_zone_pfn; |
931 | unsigned long flags; | |
b2a0ac88 | 932 | int order, t; |
1da177e4 LT |
933 | struct list_head *curr; |
934 | ||
935 | if (!zone->spanned_pages) | |
936 | return; | |
937 | ||
938 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db RW |
939 | |
940 | max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
941 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) | |
942 | if (pfn_valid(pfn)) { | |
943 | struct page *page = pfn_to_page(pfn); | |
944 | ||
7be98234 RW |
945 | if (!swsusp_page_is_forbidden(page)) |
946 | swsusp_unset_page_free(page); | |
f623f0db | 947 | } |
1da177e4 | 948 | |
b2a0ac88 MG |
949 | for_each_migratetype_order(order, t) { |
950 | list_for_each(curr, &zone->free_area[order].free_list[t]) { | |
f623f0db | 951 | unsigned long i; |
1da177e4 | 952 | |
f623f0db RW |
953 | pfn = page_to_pfn(list_entry(curr, struct page, lru)); |
954 | for (i = 0; i < (1UL << order); i++) | |
7be98234 | 955 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 956 | } |
b2a0ac88 | 957 | } |
1da177e4 LT |
958 | spin_unlock_irqrestore(&zone->lock, flags); |
959 | } | |
e2c55dc8 | 960 | #endif /* CONFIG_PM */ |
1da177e4 LT |
961 | |
962 | /* | |
963 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
964 | */ | |
965 | void drain_local_pages(void) | |
966 | { | |
967 | unsigned long flags; | |
968 | ||
969 | local_irq_save(flags); | |
970 | __drain_pages(smp_processor_id()); | |
971 | local_irq_restore(flags); | |
972 | } | |
e2c55dc8 MG |
973 | |
974 | void smp_drain_local_pages(void *arg) | |
975 | { | |
976 | drain_local_pages(); | |
977 | } | |
978 | ||
979 | /* | |
980 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator | |
981 | */ | |
982 | void drain_all_local_pages(void) | |
983 | { | |
984 | unsigned long flags; | |
985 | ||
986 | local_irq_save(flags); | |
987 | __drain_pages(smp_processor_id()); | |
988 | local_irq_restore(flags); | |
989 | ||
990 | smp_call_function(smp_drain_local_pages, NULL, 0, 1); | |
991 | } | |
1da177e4 | 992 | |
1da177e4 LT |
993 | /* |
994 | * Free a 0-order page | |
995 | */ | |
1da177e4 LT |
996 | static void fastcall free_hot_cold_page(struct page *page, int cold) |
997 | { | |
998 | struct zone *zone = page_zone(page); | |
999 | struct per_cpu_pages *pcp; | |
1000 | unsigned long flags; | |
1001 | ||
1da177e4 LT |
1002 | if (PageAnon(page)) |
1003 | page->mapping = NULL; | |
224abf92 | 1004 | if (free_pages_check(page)) |
689bcebf HD |
1005 | return; |
1006 | ||
9858db50 NP |
1007 | if (!PageHighMem(page)) |
1008 | debug_check_no_locks_freed(page_address(page), PAGE_SIZE); | |
dafb1367 | 1009 | arch_free_page(page, 0); |
689bcebf HD |
1010 | kernel_map_pages(page, 1, 0); |
1011 | ||
e7c8d5c9 | 1012 | pcp = &zone_pcp(zone, get_cpu())->pcp[cold]; |
1da177e4 | 1013 | local_irq_save(flags); |
f8891e5e | 1014 | __count_vm_event(PGFREE); |
1da177e4 | 1015 | list_add(&page->lru, &pcp->list); |
535131e6 | 1016 | set_page_private(page, get_pageblock_migratetype(page)); |
1da177e4 | 1017 | pcp->count++; |
48db57f8 NP |
1018 | if (pcp->count >= pcp->high) { |
1019 | free_pages_bulk(zone, pcp->batch, &pcp->list, 0); | |
1020 | pcp->count -= pcp->batch; | |
1021 | } | |
1da177e4 LT |
1022 | local_irq_restore(flags); |
1023 | put_cpu(); | |
1024 | } | |
1025 | ||
1026 | void fastcall free_hot_page(struct page *page) | |
1027 | { | |
1028 | free_hot_cold_page(page, 0); | |
1029 | } | |
1030 | ||
1031 | void fastcall free_cold_page(struct page *page) | |
1032 | { | |
1033 | free_hot_cold_page(page, 1); | |
1034 | } | |
1035 | ||
8dfcc9ba NP |
1036 | /* |
1037 | * split_page takes a non-compound higher-order page, and splits it into | |
1038 | * n (1<<order) sub-pages: page[0..n] | |
1039 | * Each sub-page must be freed individually. | |
1040 | * | |
1041 | * Note: this is probably too low level an operation for use in drivers. | |
1042 | * Please consult with lkml before using this in your driver. | |
1043 | */ | |
1044 | void split_page(struct page *page, unsigned int order) | |
1045 | { | |
1046 | int i; | |
1047 | ||
725d704e NP |
1048 | VM_BUG_ON(PageCompound(page)); |
1049 | VM_BUG_ON(!page_count(page)); | |
7835e98b NP |
1050 | for (i = 1; i < (1 << order); i++) |
1051 | set_page_refcounted(page + i); | |
8dfcc9ba | 1052 | } |
8dfcc9ba | 1053 | |
1da177e4 LT |
1054 | /* |
1055 | * Really, prep_compound_page() should be called from __rmqueue_bulk(). But | |
1056 | * we cheat by calling it from here, in the order > 0 path. Saves a branch | |
1057 | * or two. | |
1058 | */ | |
a74609fa NP |
1059 | static struct page *buffered_rmqueue(struct zonelist *zonelist, |
1060 | struct zone *zone, int order, gfp_t gfp_flags) | |
1da177e4 LT |
1061 | { |
1062 | unsigned long flags; | |
689bcebf | 1063 | struct page *page; |
1da177e4 | 1064 | int cold = !!(gfp_flags & __GFP_COLD); |
a74609fa | 1065 | int cpu; |
64c5e135 | 1066 | int migratetype = allocflags_to_migratetype(gfp_flags); |
1da177e4 | 1067 | |
689bcebf | 1068 | again: |
a74609fa | 1069 | cpu = get_cpu(); |
48db57f8 | 1070 | if (likely(order == 0)) { |
1da177e4 LT |
1071 | struct per_cpu_pages *pcp; |
1072 | ||
a74609fa | 1073 | pcp = &zone_pcp(zone, cpu)->pcp[cold]; |
1da177e4 | 1074 | local_irq_save(flags); |
a74609fa | 1075 | if (!pcp->count) { |
941c7105 | 1076 | pcp->count = rmqueue_bulk(zone, 0, |
b2a0ac88 | 1077 | pcp->batch, &pcp->list, migratetype); |
a74609fa NP |
1078 | if (unlikely(!pcp->count)) |
1079 | goto failed; | |
1da177e4 | 1080 | } |
b92a6edd | 1081 | |
535131e6 | 1082 | /* Find a page of the appropriate migrate type */ |
b92a6edd MG |
1083 | list_for_each_entry(page, &pcp->list, lru) |
1084 | if (page_private(page) == migratetype) | |
535131e6 | 1085 | break; |
535131e6 | 1086 | |
b92a6edd MG |
1087 | /* Allocate more to the pcp list if necessary */ |
1088 | if (unlikely(&page->lru == &pcp->list)) { | |
535131e6 MG |
1089 | pcp->count += rmqueue_bulk(zone, 0, |
1090 | pcp->batch, &pcp->list, migratetype); | |
1091 | page = list_entry(pcp->list.next, struct page, lru); | |
535131e6 | 1092 | } |
b92a6edd MG |
1093 | |
1094 | list_del(&page->lru); | |
1095 | pcp->count--; | |
7fb1d9fc | 1096 | } else { |
1da177e4 | 1097 | spin_lock_irqsave(&zone->lock, flags); |
b2a0ac88 | 1098 | page = __rmqueue(zone, order, migratetype); |
a74609fa NP |
1099 | spin_unlock(&zone->lock); |
1100 | if (!page) | |
1101 | goto failed; | |
1da177e4 LT |
1102 | } |
1103 | ||
f8891e5e | 1104 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
ca889e6c | 1105 | zone_statistics(zonelist, zone); |
a74609fa NP |
1106 | local_irq_restore(flags); |
1107 | put_cpu(); | |
1da177e4 | 1108 | |
725d704e | 1109 | VM_BUG_ON(bad_range(zone, page)); |
17cf4406 | 1110 | if (prep_new_page(page, order, gfp_flags)) |
a74609fa | 1111 | goto again; |
1da177e4 | 1112 | return page; |
a74609fa NP |
1113 | |
1114 | failed: | |
1115 | local_irq_restore(flags); | |
1116 | put_cpu(); | |
1117 | return NULL; | |
1da177e4 LT |
1118 | } |
1119 | ||
7fb1d9fc | 1120 | #define ALLOC_NO_WATERMARKS 0x01 /* don't check watermarks at all */ |
3148890b NP |
1121 | #define ALLOC_WMARK_MIN 0x02 /* use pages_min watermark */ |
1122 | #define ALLOC_WMARK_LOW 0x04 /* use pages_low watermark */ | |
1123 | #define ALLOC_WMARK_HIGH 0x08 /* use pages_high watermark */ | |
1124 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
1125 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
1126 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
7fb1d9fc | 1127 | |
933e312e AM |
1128 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
1129 | ||
1130 | static struct fail_page_alloc_attr { | |
1131 | struct fault_attr attr; | |
1132 | ||
1133 | u32 ignore_gfp_highmem; | |
1134 | u32 ignore_gfp_wait; | |
54114994 | 1135 | u32 min_order; |
933e312e AM |
1136 | |
1137 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1138 | ||
1139 | struct dentry *ignore_gfp_highmem_file; | |
1140 | struct dentry *ignore_gfp_wait_file; | |
54114994 | 1141 | struct dentry *min_order_file; |
933e312e AM |
1142 | |
1143 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1144 | ||
1145 | } fail_page_alloc = { | |
1146 | .attr = FAULT_ATTR_INITIALIZER, | |
6b1b60f4 DM |
1147 | .ignore_gfp_wait = 1, |
1148 | .ignore_gfp_highmem = 1, | |
54114994 | 1149 | .min_order = 1, |
933e312e AM |
1150 | }; |
1151 | ||
1152 | static int __init setup_fail_page_alloc(char *str) | |
1153 | { | |
1154 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
1155 | } | |
1156 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
1157 | ||
1158 | static int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1159 | { | |
54114994 AM |
1160 | if (order < fail_page_alloc.min_order) |
1161 | return 0; | |
933e312e AM |
1162 | if (gfp_mask & __GFP_NOFAIL) |
1163 | return 0; | |
1164 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) | |
1165 | return 0; | |
1166 | if (fail_page_alloc.ignore_gfp_wait && (gfp_mask & __GFP_WAIT)) | |
1167 | return 0; | |
1168 | ||
1169 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
1170 | } | |
1171 | ||
1172 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1173 | ||
1174 | static int __init fail_page_alloc_debugfs(void) | |
1175 | { | |
1176 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
1177 | struct dentry *dir; | |
1178 | int err; | |
1179 | ||
1180 | err = init_fault_attr_dentries(&fail_page_alloc.attr, | |
1181 | "fail_page_alloc"); | |
1182 | if (err) | |
1183 | return err; | |
1184 | dir = fail_page_alloc.attr.dentries.dir; | |
1185 | ||
1186 | fail_page_alloc.ignore_gfp_wait_file = | |
1187 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
1188 | &fail_page_alloc.ignore_gfp_wait); | |
1189 | ||
1190 | fail_page_alloc.ignore_gfp_highmem_file = | |
1191 | debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
1192 | &fail_page_alloc.ignore_gfp_highmem); | |
54114994 AM |
1193 | fail_page_alloc.min_order_file = |
1194 | debugfs_create_u32("min-order", mode, dir, | |
1195 | &fail_page_alloc.min_order); | |
933e312e AM |
1196 | |
1197 | if (!fail_page_alloc.ignore_gfp_wait_file || | |
54114994 AM |
1198 | !fail_page_alloc.ignore_gfp_highmem_file || |
1199 | !fail_page_alloc.min_order_file) { | |
933e312e AM |
1200 | err = -ENOMEM; |
1201 | debugfs_remove(fail_page_alloc.ignore_gfp_wait_file); | |
1202 | debugfs_remove(fail_page_alloc.ignore_gfp_highmem_file); | |
54114994 | 1203 | debugfs_remove(fail_page_alloc.min_order_file); |
933e312e AM |
1204 | cleanup_fault_attr_dentries(&fail_page_alloc.attr); |
1205 | } | |
1206 | ||
1207 | return err; | |
1208 | } | |
1209 | ||
1210 | late_initcall(fail_page_alloc_debugfs); | |
1211 | ||
1212 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1213 | ||
1214 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
1215 | ||
1216 | static inline int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1217 | { | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
1222 | ||
1da177e4 LT |
1223 | /* |
1224 | * Return 1 if free pages are above 'mark'. This takes into account the order | |
1225 | * of the allocation. | |
1226 | */ | |
1227 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 1228 | int classzone_idx, int alloc_flags) |
1da177e4 LT |
1229 | { |
1230 | /* free_pages my go negative - that's OK */ | |
d23ad423 CL |
1231 | long min = mark; |
1232 | long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1; | |
1da177e4 LT |
1233 | int o; |
1234 | ||
7fb1d9fc | 1235 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 1236 | min -= min / 2; |
7fb1d9fc | 1237 | if (alloc_flags & ALLOC_HARDER) |
1da177e4 LT |
1238 | min -= min / 4; |
1239 | ||
1240 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
1241 | return 0; | |
1242 | for (o = 0; o < order; o++) { | |
1243 | /* At the next order, this order's pages become unavailable */ | |
1244 | free_pages -= z->free_area[o].nr_free << o; | |
1245 | ||
1246 | /* Require fewer higher order pages to be free */ | |
1247 | min >>= 1; | |
1248 | ||
1249 | if (free_pages <= min) | |
1250 | return 0; | |
1251 | } | |
1252 | return 1; | |
1253 | } | |
1254 | ||
9276b1bc PJ |
1255 | #ifdef CONFIG_NUMA |
1256 | /* | |
1257 | * zlc_setup - Setup for "zonelist cache". Uses cached zone data to | |
1258 | * skip over zones that are not allowed by the cpuset, or that have | |
1259 | * been recently (in last second) found to be nearly full. See further | |
1260 | * comments in mmzone.h. Reduces cache footprint of zonelist scans | |
1261 | * that have to skip over alot of full or unallowed zones. | |
1262 | * | |
1263 | * If the zonelist cache is present in the passed in zonelist, then | |
1264 | * returns a pointer to the allowed node mask (either the current | |
37b07e41 | 1265 | * tasks mems_allowed, or node_states[N_HIGH_MEMORY].) |
9276b1bc PJ |
1266 | * |
1267 | * If the zonelist cache is not available for this zonelist, does | |
1268 | * nothing and returns NULL. | |
1269 | * | |
1270 | * If the fullzones BITMAP in the zonelist cache is stale (more than | |
1271 | * a second since last zap'd) then we zap it out (clear its bits.) | |
1272 | * | |
1273 | * We hold off even calling zlc_setup, until after we've checked the | |
1274 | * first zone in the zonelist, on the theory that most allocations will | |
1275 | * be satisfied from that first zone, so best to examine that zone as | |
1276 | * quickly as we can. | |
1277 | */ | |
1278 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1279 | { | |
1280 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1281 | nodemask_t *allowednodes; /* zonelist_cache approximation */ | |
1282 | ||
1283 | zlc = zonelist->zlcache_ptr; | |
1284 | if (!zlc) | |
1285 | return NULL; | |
1286 | ||
1287 | if (jiffies - zlc->last_full_zap > 1 * HZ) { | |
1288 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); | |
1289 | zlc->last_full_zap = jiffies; | |
1290 | } | |
1291 | ||
1292 | allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ? | |
1293 | &cpuset_current_mems_allowed : | |
37b07e41 | 1294 | &node_states[N_HIGH_MEMORY]; |
9276b1bc PJ |
1295 | return allowednodes; |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * Given 'z' scanning a zonelist, run a couple of quick checks to see | |
1300 | * if it is worth looking at further for free memory: | |
1301 | * 1) Check that the zone isn't thought to be full (doesn't have its | |
1302 | * bit set in the zonelist_cache fullzones BITMAP). | |
1303 | * 2) Check that the zones node (obtained from the zonelist_cache | |
1304 | * z_to_n[] mapping) is allowed in the passed in allowednodes mask. | |
1305 | * Return true (non-zero) if zone is worth looking at further, or | |
1306 | * else return false (zero) if it is not. | |
1307 | * | |
1308 | * This check -ignores- the distinction between various watermarks, | |
1309 | * such as GFP_HIGH, GFP_ATOMIC, PF_MEMALLOC, ... If a zone is | |
1310 | * found to be full for any variation of these watermarks, it will | |
1311 | * be considered full for up to one second by all requests, unless | |
1312 | * we are so low on memory on all allowed nodes that we are forced | |
1313 | * into the second scan of the zonelist. | |
1314 | * | |
1315 | * In the second scan we ignore this zonelist cache and exactly | |
1316 | * apply the watermarks to all zones, even it is slower to do so. | |
1317 | * We are low on memory in the second scan, and should leave no stone | |
1318 | * unturned looking for a free page. | |
1319 | */ | |
1320 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zone **z, | |
1321 | nodemask_t *allowednodes) | |
1322 | { | |
1323 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1324 | int i; /* index of *z in zonelist zones */ | |
1325 | int n; /* node that zone *z is on */ | |
1326 | ||
1327 | zlc = zonelist->zlcache_ptr; | |
1328 | if (!zlc) | |
1329 | return 1; | |
1330 | ||
1331 | i = z - zonelist->zones; | |
1332 | n = zlc->z_to_n[i]; | |
1333 | ||
1334 | /* This zone is worth trying if it is allowed but not full */ | |
1335 | return node_isset(n, *allowednodes) && !test_bit(i, zlc->fullzones); | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Given 'z' scanning a zonelist, set the corresponding bit in | |
1340 | * zlc->fullzones, so that subsequent attempts to allocate a page | |
1341 | * from that zone don't waste time re-examining it. | |
1342 | */ | |
1343 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zone **z) | |
1344 | { | |
1345 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1346 | int i; /* index of *z in zonelist zones */ | |
1347 | ||
1348 | zlc = zonelist->zlcache_ptr; | |
1349 | if (!zlc) | |
1350 | return; | |
1351 | ||
1352 | i = z - zonelist->zones; | |
1353 | ||
1354 | set_bit(i, zlc->fullzones); | |
1355 | } | |
1356 | ||
1357 | #else /* CONFIG_NUMA */ | |
1358 | ||
1359 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1360 | { | |
1361 | return NULL; | |
1362 | } | |
1363 | ||
1364 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zone **z, | |
1365 | nodemask_t *allowednodes) | |
1366 | { | |
1367 | return 1; | |
1368 | } | |
1369 | ||
1370 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zone **z) | |
1371 | { | |
1372 | } | |
1373 | #endif /* CONFIG_NUMA */ | |
1374 | ||
7fb1d9fc | 1375 | /* |
0798e519 | 1376 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
1377 | * a page. |
1378 | */ | |
1379 | static struct page * | |
1380 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, | |
1381 | struct zonelist *zonelist, int alloc_flags) | |
753ee728 | 1382 | { |
9276b1bc | 1383 | struct zone **z; |
7fb1d9fc | 1384 | struct page *page = NULL; |
9276b1bc | 1385 | int classzone_idx = zone_idx(zonelist->zones[0]); |
1192d526 | 1386 | struct zone *zone; |
9276b1bc PJ |
1387 | nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */ |
1388 | int zlc_active = 0; /* set if using zonelist_cache */ | |
1389 | int did_zlc_setup = 0; /* just call zlc_setup() one time */ | |
b377fd39 | 1390 | enum zone_type highest_zoneidx = -1; /* Gets set for policy zonelists */ |
7fb1d9fc | 1391 | |
9276b1bc | 1392 | zonelist_scan: |
7fb1d9fc | 1393 | /* |
9276b1bc | 1394 | * Scan zonelist, looking for a zone with enough free. |
7fb1d9fc RS |
1395 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1396 | */ | |
9276b1bc PJ |
1397 | z = zonelist->zones; |
1398 | ||
7fb1d9fc | 1399 | do { |
b377fd39 MG |
1400 | /* |
1401 | * In NUMA, this could be a policy zonelist which contains | |
1402 | * zones that may not be allowed by the current gfp_mask. | |
1403 | * Check the zone is allowed by the current flags | |
1404 | */ | |
1405 | if (unlikely(alloc_should_filter_zonelist(zonelist))) { | |
1406 | if (highest_zoneidx == -1) | |
1407 | highest_zoneidx = gfp_zone(gfp_mask); | |
1408 | if (zone_idx(*z) > highest_zoneidx) | |
1409 | continue; | |
1410 | } | |
1411 | ||
9276b1bc PJ |
1412 | if (NUMA_BUILD && zlc_active && |
1413 | !zlc_zone_worth_trying(zonelist, z, allowednodes)) | |
1414 | continue; | |
1192d526 | 1415 | zone = *z; |
7fb1d9fc | 1416 | if ((alloc_flags & ALLOC_CPUSET) && |
02a0e53d | 1417 | !cpuset_zone_allowed_softwall(zone, gfp_mask)) |
9276b1bc | 1418 | goto try_next_zone; |
7fb1d9fc RS |
1419 | |
1420 | if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { | |
3148890b NP |
1421 | unsigned long mark; |
1422 | if (alloc_flags & ALLOC_WMARK_MIN) | |
1192d526 | 1423 | mark = zone->pages_min; |
3148890b | 1424 | else if (alloc_flags & ALLOC_WMARK_LOW) |
1192d526 | 1425 | mark = zone->pages_low; |
3148890b | 1426 | else |
1192d526 | 1427 | mark = zone->pages_high; |
0798e519 PJ |
1428 | if (!zone_watermark_ok(zone, order, mark, |
1429 | classzone_idx, alloc_flags)) { | |
9eeff239 | 1430 | if (!zone_reclaim_mode || |
1192d526 | 1431 | !zone_reclaim(zone, gfp_mask, order)) |
9276b1bc | 1432 | goto this_zone_full; |
0798e519 | 1433 | } |
7fb1d9fc RS |
1434 | } |
1435 | ||
1192d526 | 1436 | page = buffered_rmqueue(zonelist, zone, order, gfp_mask); |
0798e519 | 1437 | if (page) |
7fb1d9fc | 1438 | break; |
9276b1bc PJ |
1439 | this_zone_full: |
1440 | if (NUMA_BUILD) | |
1441 | zlc_mark_zone_full(zonelist, z); | |
1442 | try_next_zone: | |
1443 | if (NUMA_BUILD && !did_zlc_setup) { | |
1444 | /* we do zlc_setup after the first zone is tried */ | |
1445 | allowednodes = zlc_setup(zonelist, alloc_flags); | |
1446 | zlc_active = 1; | |
1447 | did_zlc_setup = 1; | |
1448 | } | |
7fb1d9fc | 1449 | } while (*(++z) != NULL); |
9276b1bc PJ |
1450 | |
1451 | if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) { | |
1452 | /* Disable zlc cache for second zonelist scan */ | |
1453 | zlc_active = 0; | |
1454 | goto zonelist_scan; | |
1455 | } | |
7fb1d9fc | 1456 | return page; |
753ee728 MH |
1457 | } |
1458 | ||
1da177e4 LT |
1459 | /* |
1460 | * This is the 'heart' of the zoned buddy allocator. | |
1461 | */ | |
1462 | struct page * fastcall | |
dd0fc66f | 1463 | __alloc_pages(gfp_t gfp_mask, unsigned int order, |
1da177e4 LT |
1464 | struct zonelist *zonelist) |
1465 | { | |
260b2367 | 1466 | const gfp_t wait = gfp_mask & __GFP_WAIT; |
7fb1d9fc | 1467 | struct zone **z; |
1da177e4 LT |
1468 | struct page *page; |
1469 | struct reclaim_state reclaim_state; | |
1470 | struct task_struct *p = current; | |
1da177e4 | 1471 | int do_retry; |
7fb1d9fc | 1472 | int alloc_flags; |
1da177e4 LT |
1473 | int did_some_progress; |
1474 | ||
1475 | might_sleep_if(wait); | |
1476 | ||
933e312e AM |
1477 | if (should_fail_alloc_page(gfp_mask, order)) |
1478 | return NULL; | |
1479 | ||
6b1de916 | 1480 | restart: |
7fb1d9fc | 1481 | z = zonelist->zones; /* the list of zones suitable for gfp_mask */ |
1da177e4 | 1482 | |
7fb1d9fc | 1483 | if (unlikely(*z == NULL)) { |
523b9458 CL |
1484 | /* |
1485 | * Happens if we have an empty zonelist as a result of | |
1486 | * GFP_THISNODE being used on a memoryless node | |
1487 | */ | |
1da177e4 LT |
1488 | return NULL; |
1489 | } | |
6b1de916 | 1490 | |
7fb1d9fc | 1491 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 1492 | zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET); |
7fb1d9fc RS |
1493 | if (page) |
1494 | goto got_pg; | |
1da177e4 | 1495 | |
952f3b51 CL |
1496 | /* |
1497 | * GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and | |
1498 | * __GFP_NOWARN set) should not cause reclaim since the subsystem | |
1499 | * (f.e. slab) using GFP_THISNODE may choose to trigger reclaim | |
1500 | * using a larger set of nodes after it has established that the | |
1501 | * allowed per node queues are empty and that nodes are | |
1502 | * over allocated. | |
1503 | */ | |
1504 | if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE) | |
1505 | goto nopage; | |
1506 | ||
0798e519 | 1507 | for (z = zonelist->zones; *z; z++) |
43b0bc00 | 1508 | wakeup_kswapd(*z, order); |
1da177e4 | 1509 | |
9bf2229f | 1510 | /* |
7fb1d9fc RS |
1511 | * OK, we're below the kswapd watermark and have kicked background |
1512 | * reclaim. Now things get more complex, so set up alloc_flags according | |
1513 | * to how we want to proceed. | |
1514 | * | |
1515 | * The caller may dip into page reserves a bit more if the caller | |
1516 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
4eac915d PJ |
1517 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will |
1518 | * set both ALLOC_HARDER (!wait) and ALLOC_HIGH (__GFP_HIGH). | |
9bf2229f | 1519 | */ |
3148890b | 1520 | alloc_flags = ALLOC_WMARK_MIN; |
7fb1d9fc RS |
1521 | if ((unlikely(rt_task(p)) && !in_interrupt()) || !wait) |
1522 | alloc_flags |= ALLOC_HARDER; | |
1523 | if (gfp_mask & __GFP_HIGH) | |
1524 | alloc_flags |= ALLOC_HIGH; | |
bdd804f4 PJ |
1525 | if (wait) |
1526 | alloc_flags |= ALLOC_CPUSET; | |
1da177e4 LT |
1527 | |
1528 | /* | |
1529 | * Go through the zonelist again. Let __GFP_HIGH and allocations | |
7fb1d9fc | 1530 | * coming from realtime tasks go deeper into reserves. |
1da177e4 LT |
1531 | * |
1532 | * This is the last chance, in general, before the goto nopage. | |
1533 | * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc. | |
9bf2229f | 1534 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1da177e4 | 1535 | */ |
7fb1d9fc RS |
1536 | page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags); |
1537 | if (page) | |
1538 | goto got_pg; | |
1da177e4 LT |
1539 | |
1540 | /* This allocation should allow future memory freeing. */ | |
b84a35be | 1541 | |
b43a57bb | 1542 | rebalance: |
b84a35be NP |
1543 | if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) |
1544 | && !in_interrupt()) { | |
1545 | if (!(gfp_mask & __GFP_NOMEMALLOC)) { | |
885036d3 | 1546 | nofail_alloc: |
b84a35be | 1547 | /* go through the zonelist yet again, ignoring mins */ |
7fb1d9fc | 1548 | page = get_page_from_freelist(gfp_mask, order, |
47f3a867 | 1549 | zonelist, ALLOC_NO_WATERMARKS); |
7fb1d9fc RS |
1550 | if (page) |
1551 | goto got_pg; | |
885036d3 | 1552 | if (gfp_mask & __GFP_NOFAIL) { |
3fcfab16 | 1553 | congestion_wait(WRITE, HZ/50); |
885036d3 KK |
1554 | goto nofail_alloc; |
1555 | } | |
1da177e4 LT |
1556 | } |
1557 | goto nopage; | |
1558 | } | |
1559 | ||
1560 | /* Atomic allocations - we can't balance anything */ | |
1561 | if (!wait) | |
1562 | goto nopage; | |
1563 | ||
1da177e4 LT |
1564 | cond_resched(); |
1565 | ||
1566 | /* We now go into synchronous reclaim */ | |
3e0d98b9 | 1567 | cpuset_memory_pressure_bump(); |
1da177e4 LT |
1568 | p->flags |= PF_MEMALLOC; |
1569 | reclaim_state.reclaimed_slab = 0; | |
1570 | p->reclaim_state = &reclaim_state; | |
1571 | ||
5ad333eb | 1572 | did_some_progress = try_to_free_pages(zonelist->zones, order, gfp_mask); |
1da177e4 LT |
1573 | |
1574 | p->reclaim_state = NULL; | |
1575 | p->flags &= ~PF_MEMALLOC; | |
1576 | ||
1577 | cond_resched(); | |
1578 | ||
e2c55dc8 MG |
1579 | if (order != 0) |
1580 | drain_all_local_pages(); | |
1581 | ||
1da177e4 | 1582 | if (likely(did_some_progress)) { |
7fb1d9fc RS |
1583 | page = get_page_from_freelist(gfp_mask, order, |
1584 | zonelist, alloc_flags); | |
1585 | if (page) | |
1586 | goto got_pg; | |
1da177e4 LT |
1587 | } else if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) { |
1588 | /* | |
1589 | * Go through the zonelist yet one more time, keep | |
1590 | * very high watermark here, this is only to catch | |
1591 | * a parallel oom killing, we must fail if we're still | |
1592 | * under heavy pressure. | |
1593 | */ | |
7fb1d9fc | 1594 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 1595 | zonelist, ALLOC_WMARK_HIGH|ALLOC_CPUSET); |
7fb1d9fc RS |
1596 | if (page) |
1597 | goto got_pg; | |
1da177e4 | 1598 | |
a8bbf72a MG |
1599 | /* The OOM killer will not help higher order allocs so fail */ |
1600 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
1601 | goto nopage; | |
1602 | ||
9b0f8b04 | 1603 | out_of_memory(zonelist, gfp_mask, order); |
1da177e4 LT |
1604 | goto restart; |
1605 | } | |
1606 | ||
1607 | /* | |
1608 | * Don't let big-order allocations loop unless the caller explicitly | |
1609 | * requests that. Wait for some write requests to complete then retry. | |
1610 | * | |
1611 | * In this implementation, __GFP_REPEAT means __GFP_NOFAIL for order | |
1612 | * <= 3, but that may not be true in other implementations. | |
1613 | */ | |
1614 | do_retry = 0; | |
1615 | if (!(gfp_mask & __GFP_NORETRY)) { | |
5ad333eb AW |
1616 | if ((order <= PAGE_ALLOC_COSTLY_ORDER) || |
1617 | (gfp_mask & __GFP_REPEAT)) | |
1da177e4 LT |
1618 | do_retry = 1; |
1619 | if (gfp_mask & __GFP_NOFAIL) | |
1620 | do_retry = 1; | |
1621 | } | |
1622 | if (do_retry) { | |
3fcfab16 | 1623 | congestion_wait(WRITE, HZ/50); |
1da177e4 LT |
1624 | goto rebalance; |
1625 | } | |
1626 | ||
1627 | nopage: | |
1628 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) { | |
1629 | printk(KERN_WARNING "%s: page allocation failure." | |
1630 | " order:%d, mode:0x%x\n", | |
1631 | p->comm, order, gfp_mask); | |
1632 | dump_stack(); | |
578c2fd6 | 1633 | show_mem(); |
1da177e4 | 1634 | } |
1da177e4 | 1635 | got_pg: |
1da177e4 LT |
1636 | return page; |
1637 | } | |
1638 | ||
1639 | EXPORT_SYMBOL(__alloc_pages); | |
1640 | ||
1641 | /* | |
1642 | * Common helper functions. | |
1643 | */ | |
dd0fc66f | 1644 | fastcall unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
1645 | { |
1646 | struct page * page; | |
1647 | page = alloc_pages(gfp_mask, order); | |
1648 | if (!page) | |
1649 | return 0; | |
1650 | return (unsigned long) page_address(page); | |
1651 | } | |
1652 | ||
1653 | EXPORT_SYMBOL(__get_free_pages); | |
1654 | ||
dd0fc66f | 1655 | fastcall unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 LT |
1656 | { |
1657 | struct page * page; | |
1658 | ||
1659 | /* | |
1660 | * get_zeroed_page() returns a 32-bit address, which cannot represent | |
1661 | * a highmem page | |
1662 | */ | |
725d704e | 1663 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); |
1da177e4 LT |
1664 | |
1665 | page = alloc_pages(gfp_mask | __GFP_ZERO, 0); | |
1666 | if (page) | |
1667 | return (unsigned long) page_address(page); | |
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | EXPORT_SYMBOL(get_zeroed_page); | |
1672 | ||
1673 | void __pagevec_free(struct pagevec *pvec) | |
1674 | { | |
1675 | int i = pagevec_count(pvec); | |
1676 | ||
1677 | while (--i >= 0) | |
1678 | free_hot_cold_page(pvec->pages[i], pvec->cold); | |
1679 | } | |
1680 | ||
1681 | fastcall void __free_pages(struct page *page, unsigned int order) | |
1682 | { | |
b5810039 | 1683 | if (put_page_testzero(page)) { |
1da177e4 LT |
1684 | if (order == 0) |
1685 | free_hot_page(page); | |
1686 | else | |
1687 | __free_pages_ok(page, order); | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | EXPORT_SYMBOL(__free_pages); | |
1692 | ||
1693 | fastcall void free_pages(unsigned long addr, unsigned int order) | |
1694 | { | |
1695 | if (addr != 0) { | |
725d704e | 1696 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
1697 | __free_pages(virt_to_page((void *)addr), order); |
1698 | } | |
1699 | } | |
1700 | ||
1701 | EXPORT_SYMBOL(free_pages); | |
1702 | ||
1da177e4 LT |
1703 | static unsigned int nr_free_zone_pages(int offset) |
1704 | { | |
e310fd43 MB |
1705 | /* Just pick one node, since fallback list is circular */ |
1706 | pg_data_t *pgdat = NODE_DATA(numa_node_id()); | |
1da177e4 LT |
1707 | unsigned int sum = 0; |
1708 | ||
e310fd43 MB |
1709 | struct zonelist *zonelist = pgdat->node_zonelists + offset; |
1710 | struct zone **zonep = zonelist->zones; | |
1711 | struct zone *zone; | |
1da177e4 | 1712 | |
e310fd43 MB |
1713 | for (zone = *zonep++; zone; zone = *zonep++) { |
1714 | unsigned long size = zone->present_pages; | |
1715 | unsigned long high = zone->pages_high; | |
1716 | if (size > high) | |
1717 | sum += size - high; | |
1da177e4 LT |
1718 | } |
1719 | ||
1720 | return sum; | |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL | |
1725 | */ | |
1726 | unsigned int nr_free_buffer_pages(void) | |
1727 | { | |
af4ca457 | 1728 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 1729 | } |
c2f1a551 | 1730 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 LT |
1731 | |
1732 | /* | |
1733 | * Amount of free RAM allocatable within all zones | |
1734 | */ | |
1735 | unsigned int nr_free_pagecache_pages(void) | |
1736 | { | |
2a1e274a | 1737 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 1738 | } |
08e0f6a9 CL |
1739 | |
1740 | static inline void show_node(struct zone *zone) | |
1da177e4 | 1741 | { |
08e0f6a9 | 1742 | if (NUMA_BUILD) |
25ba77c1 | 1743 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 1744 | } |
1da177e4 | 1745 | |
1da177e4 LT |
1746 | void si_meminfo(struct sysinfo *val) |
1747 | { | |
1748 | val->totalram = totalram_pages; | |
1749 | val->sharedram = 0; | |
d23ad423 | 1750 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 1751 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
1752 | val->totalhigh = totalhigh_pages; |
1753 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
1754 | val->mem_unit = PAGE_SIZE; |
1755 | } | |
1756 | ||
1757 | EXPORT_SYMBOL(si_meminfo); | |
1758 | ||
1759 | #ifdef CONFIG_NUMA | |
1760 | void si_meminfo_node(struct sysinfo *val, int nid) | |
1761 | { | |
1762 | pg_data_t *pgdat = NODE_DATA(nid); | |
1763 | ||
1764 | val->totalram = pgdat->node_present_pages; | |
d23ad423 | 1765 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 1766 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 1767 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
d23ad423 CL |
1768 | val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], |
1769 | NR_FREE_PAGES); | |
98d2b0eb CL |
1770 | #else |
1771 | val->totalhigh = 0; | |
1772 | val->freehigh = 0; | |
1773 | #endif | |
1da177e4 LT |
1774 | val->mem_unit = PAGE_SIZE; |
1775 | } | |
1776 | #endif | |
1777 | ||
1778 | #define K(x) ((x) << (PAGE_SHIFT-10)) | |
1779 | ||
1780 | /* | |
1781 | * Show free area list (used inside shift_scroll-lock stuff) | |
1782 | * We also calculate the percentage fragmentation. We do this by counting the | |
1783 | * memory on each free list with the exception of the first item on the list. | |
1784 | */ | |
1785 | void show_free_areas(void) | |
1786 | { | |
c7241913 | 1787 | int cpu; |
1da177e4 LT |
1788 | struct zone *zone; |
1789 | ||
1790 | for_each_zone(zone) { | |
c7241913 | 1791 | if (!populated_zone(zone)) |
1da177e4 | 1792 | continue; |
c7241913 JS |
1793 | |
1794 | show_node(zone); | |
1795 | printk("%s per-cpu:\n", zone->name); | |
1da177e4 | 1796 | |
6b482c67 | 1797 | for_each_online_cpu(cpu) { |
1da177e4 LT |
1798 | struct per_cpu_pageset *pageset; |
1799 | ||
e7c8d5c9 | 1800 | pageset = zone_pcp(zone, cpu); |
1da177e4 | 1801 | |
c7241913 JS |
1802 | printk("CPU %4d: Hot: hi:%5d, btch:%4d usd:%4d " |
1803 | "Cold: hi:%5d, btch:%4d usd:%4d\n", | |
1804 | cpu, pageset->pcp[0].high, | |
1805 | pageset->pcp[0].batch, pageset->pcp[0].count, | |
1806 | pageset->pcp[1].high, pageset->pcp[1].batch, | |
1807 | pageset->pcp[1].count); | |
1da177e4 LT |
1808 | } |
1809 | } | |
1810 | ||
a25700a5 | 1811 | printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
d23ad423 | 1812 | " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n", |
65e458d4 CL |
1813 | global_page_state(NR_ACTIVE), |
1814 | global_page_state(NR_INACTIVE), | |
b1e7a8fd | 1815 | global_page_state(NR_FILE_DIRTY), |
ce866b34 | 1816 | global_page_state(NR_WRITEBACK), |
fd39fc85 | 1817 | global_page_state(NR_UNSTABLE_NFS), |
d23ad423 | 1818 | global_page_state(NR_FREE_PAGES), |
972d1a7b CL |
1819 | global_page_state(NR_SLAB_RECLAIMABLE) + |
1820 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
65ba55f5 | 1821 | global_page_state(NR_FILE_MAPPED), |
a25700a5 AM |
1822 | global_page_state(NR_PAGETABLE), |
1823 | global_page_state(NR_BOUNCE)); | |
1da177e4 LT |
1824 | |
1825 | for_each_zone(zone) { | |
1826 | int i; | |
1827 | ||
c7241913 JS |
1828 | if (!populated_zone(zone)) |
1829 | continue; | |
1830 | ||
1da177e4 LT |
1831 | show_node(zone); |
1832 | printk("%s" | |
1833 | " free:%lukB" | |
1834 | " min:%lukB" | |
1835 | " low:%lukB" | |
1836 | " high:%lukB" | |
1837 | " active:%lukB" | |
1838 | " inactive:%lukB" | |
1839 | " present:%lukB" | |
1840 | " pages_scanned:%lu" | |
1841 | " all_unreclaimable? %s" | |
1842 | "\n", | |
1843 | zone->name, | |
d23ad423 | 1844 | K(zone_page_state(zone, NR_FREE_PAGES)), |
1da177e4 LT |
1845 | K(zone->pages_min), |
1846 | K(zone->pages_low), | |
1847 | K(zone->pages_high), | |
c8785385 CL |
1848 | K(zone_page_state(zone, NR_ACTIVE)), |
1849 | K(zone_page_state(zone, NR_INACTIVE)), | |
1da177e4 LT |
1850 | K(zone->present_pages), |
1851 | zone->pages_scanned, | |
1852 | (zone->all_unreclaimable ? "yes" : "no") | |
1853 | ); | |
1854 | printk("lowmem_reserve[]:"); | |
1855 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1856 | printk(" %lu", zone->lowmem_reserve[i]); | |
1857 | printk("\n"); | |
1858 | } | |
1859 | ||
1860 | for_each_zone(zone) { | |
8f9de51a | 1861 | unsigned long nr[MAX_ORDER], flags, order, total = 0; |
1da177e4 | 1862 | |
c7241913 JS |
1863 | if (!populated_zone(zone)) |
1864 | continue; | |
1865 | ||
1da177e4 LT |
1866 | show_node(zone); |
1867 | printk("%s: ", zone->name); | |
1da177e4 LT |
1868 | |
1869 | spin_lock_irqsave(&zone->lock, flags); | |
1870 | for (order = 0; order < MAX_ORDER; order++) { | |
8f9de51a KK |
1871 | nr[order] = zone->free_area[order].nr_free; |
1872 | total += nr[order] << order; | |
1da177e4 LT |
1873 | } |
1874 | spin_unlock_irqrestore(&zone->lock, flags); | |
8f9de51a KK |
1875 | for (order = 0; order < MAX_ORDER; order++) |
1876 | printk("%lu*%lukB ", nr[order], K(1UL) << order); | |
1da177e4 LT |
1877 | printk("= %lukB\n", K(total)); |
1878 | } | |
1879 | ||
1880 | show_swap_cache_info(); | |
1881 | } | |
1882 | ||
1883 | /* | |
1884 | * Builds allocation fallback zone lists. | |
1a93205b CL |
1885 | * |
1886 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 1887 | */ |
f0c0b2b8 KH |
1888 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
1889 | int nr_zones, enum zone_type zone_type) | |
1da177e4 | 1890 | { |
1a93205b CL |
1891 | struct zone *zone; |
1892 | ||
98d2b0eb | 1893 | BUG_ON(zone_type >= MAX_NR_ZONES); |
2f6726e5 | 1894 | zone_type++; |
02a68a5e CL |
1895 | |
1896 | do { | |
2f6726e5 | 1897 | zone_type--; |
070f8032 | 1898 | zone = pgdat->node_zones + zone_type; |
1a93205b | 1899 | if (populated_zone(zone)) { |
070f8032 CL |
1900 | zonelist->zones[nr_zones++] = zone; |
1901 | check_highest_zone(zone_type); | |
1da177e4 | 1902 | } |
02a68a5e | 1903 | |
2f6726e5 | 1904 | } while (zone_type); |
070f8032 | 1905 | return nr_zones; |
1da177e4 LT |
1906 | } |
1907 | ||
f0c0b2b8 KH |
1908 | |
1909 | /* | |
1910 | * zonelist_order: | |
1911 | * 0 = automatic detection of better ordering. | |
1912 | * 1 = order by ([node] distance, -zonetype) | |
1913 | * 2 = order by (-zonetype, [node] distance) | |
1914 | * | |
1915 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
1916 | * the same zonelist. So only NUMA can configure this param. | |
1917 | */ | |
1918 | #define ZONELIST_ORDER_DEFAULT 0 | |
1919 | #define ZONELIST_ORDER_NODE 1 | |
1920 | #define ZONELIST_ORDER_ZONE 2 | |
1921 | ||
1922 | /* zonelist order in the kernel. | |
1923 | * set_zonelist_order() will set this to NODE or ZONE. | |
1924 | */ | |
1925 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1926 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
1927 | ||
1928 | ||
1da177e4 | 1929 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
1930 | /* The value user specified ....changed by config */ |
1931 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1932 | /* string for sysctl */ | |
1933 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
1934 | char numa_zonelist_order[16] = "default"; | |
1935 | ||
1936 | /* | |
1937 | * interface for configure zonelist ordering. | |
1938 | * command line option "numa_zonelist_order" | |
1939 | * = "[dD]efault - default, automatic configuration. | |
1940 | * = "[nN]ode - order by node locality, then by zone within node | |
1941 | * = "[zZ]one - order by zone, then by locality within zone | |
1942 | */ | |
1943 | ||
1944 | static int __parse_numa_zonelist_order(char *s) | |
1945 | { | |
1946 | if (*s == 'd' || *s == 'D') { | |
1947 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1948 | } else if (*s == 'n' || *s == 'N') { | |
1949 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
1950 | } else if (*s == 'z' || *s == 'Z') { | |
1951 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
1952 | } else { | |
1953 | printk(KERN_WARNING | |
1954 | "Ignoring invalid numa_zonelist_order value: " | |
1955 | "%s\n", s); | |
1956 | return -EINVAL; | |
1957 | } | |
1958 | return 0; | |
1959 | } | |
1960 | ||
1961 | static __init int setup_numa_zonelist_order(char *s) | |
1962 | { | |
1963 | if (s) | |
1964 | return __parse_numa_zonelist_order(s); | |
1965 | return 0; | |
1966 | } | |
1967 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
1968 | ||
1969 | /* | |
1970 | * sysctl handler for numa_zonelist_order | |
1971 | */ | |
1972 | int numa_zonelist_order_handler(ctl_table *table, int write, | |
1973 | struct file *file, void __user *buffer, size_t *length, | |
1974 | loff_t *ppos) | |
1975 | { | |
1976 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
1977 | int ret; | |
1978 | ||
1979 | if (write) | |
1980 | strncpy(saved_string, (char*)table->data, | |
1981 | NUMA_ZONELIST_ORDER_LEN); | |
1982 | ret = proc_dostring(table, write, file, buffer, length, ppos); | |
1983 | if (ret) | |
1984 | return ret; | |
1985 | if (write) { | |
1986 | int oldval = user_zonelist_order; | |
1987 | if (__parse_numa_zonelist_order((char*)table->data)) { | |
1988 | /* | |
1989 | * bogus value. restore saved string | |
1990 | */ | |
1991 | strncpy((char*)table->data, saved_string, | |
1992 | NUMA_ZONELIST_ORDER_LEN); | |
1993 | user_zonelist_order = oldval; | |
1994 | } else if (oldval != user_zonelist_order) | |
1995 | build_all_zonelists(); | |
1996 | } | |
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | ||
1da177e4 | 2001 | #define MAX_NODE_LOAD (num_online_nodes()) |
f0c0b2b8 KH |
2002 | static int node_load[MAX_NUMNODES]; |
2003 | ||
1da177e4 | 2004 | /** |
4dc3b16b | 2005 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
2006 | * @node: node whose fallback list we're appending |
2007 | * @used_node_mask: nodemask_t of already used nodes | |
2008 | * | |
2009 | * We use a number of factors to determine which is the next node that should | |
2010 | * appear on a given node's fallback list. The node should not have appeared | |
2011 | * already in @node's fallback list, and it should be the next closest node | |
2012 | * according to the distance array (which contains arbitrary distance values | |
2013 | * from each node to each node in the system), and should also prefer nodes | |
2014 | * with no CPUs, since presumably they'll have very little allocation pressure | |
2015 | * on them otherwise. | |
2016 | * It returns -1 if no node is found. | |
2017 | */ | |
f0c0b2b8 | 2018 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 2019 | { |
4cf808eb | 2020 | int n, val; |
1da177e4 LT |
2021 | int min_val = INT_MAX; |
2022 | int best_node = -1; | |
2023 | ||
4cf808eb LT |
2024 | /* Use the local node if we haven't already */ |
2025 | if (!node_isset(node, *used_node_mask)) { | |
2026 | node_set(node, *used_node_mask); | |
2027 | return node; | |
2028 | } | |
1da177e4 | 2029 | |
37b07e41 | 2030 | for_each_node_state(n, N_HIGH_MEMORY) { |
4cf808eb | 2031 | cpumask_t tmp; |
1da177e4 LT |
2032 | |
2033 | /* Don't want a node to appear more than once */ | |
2034 | if (node_isset(n, *used_node_mask)) | |
2035 | continue; | |
2036 | ||
1da177e4 LT |
2037 | /* Use the distance array to find the distance */ |
2038 | val = node_distance(node, n); | |
2039 | ||
4cf808eb LT |
2040 | /* Penalize nodes under us ("prefer the next node") */ |
2041 | val += (n < node); | |
2042 | ||
1da177e4 LT |
2043 | /* Give preference to headless and unused nodes */ |
2044 | tmp = node_to_cpumask(n); | |
2045 | if (!cpus_empty(tmp)) | |
2046 | val += PENALTY_FOR_NODE_WITH_CPUS; | |
2047 | ||
2048 | /* Slight preference for less loaded node */ | |
2049 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
2050 | val += node_load[n]; | |
2051 | ||
2052 | if (val < min_val) { | |
2053 | min_val = val; | |
2054 | best_node = n; | |
2055 | } | |
2056 | } | |
2057 | ||
2058 | if (best_node >= 0) | |
2059 | node_set(best_node, *used_node_mask); | |
2060 | ||
2061 | return best_node; | |
2062 | } | |
2063 | ||
f0c0b2b8 KH |
2064 | |
2065 | /* | |
2066 | * Build zonelists ordered by node and zones within node. | |
2067 | * This results in maximum locality--normal zone overflows into local | |
2068 | * DMA zone, if any--but risks exhausting DMA zone. | |
2069 | */ | |
2070 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 2071 | { |
19655d34 | 2072 | enum zone_type i; |
f0c0b2b8 | 2073 | int j; |
1da177e4 | 2074 | struct zonelist *zonelist; |
f0c0b2b8 KH |
2075 | |
2076 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2077 | zonelist = pgdat->node_zonelists + i; | |
2078 | for (j = 0; zonelist->zones[j] != NULL; j++) | |
2079 | ; | |
2080 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); | |
2081 | zonelist->zones[j] = NULL; | |
2082 | } | |
2083 | } | |
2084 | ||
523b9458 CL |
2085 | /* |
2086 | * Build gfp_thisnode zonelists | |
2087 | */ | |
2088 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
2089 | { | |
2090 | enum zone_type i; | |
2091 | int j; | |
2092 | struct zonelist *zonelist; | |
2093 | ||
2094 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2095 | zonelist = pgdat->node_zonelists + MAX_NR_ZONES + i; | |
2096 | j = build_zonelists_node(pgdat, zonelist, 0, i); | |
2097 | zonelist->zones[j] = NULL; | |
2098 | } | |
2099 | } | |
2100 | ||
f0c0b2b8 KH |
2101 | /* |
2102 | * Build zonelists ordered by zone and nodes within zones. | |
2103 | * This results in conserving DMA zone[s] until all Normal memory is | |
2104 | * exhausted, but results in overflowing to remote node while memory | |
2105 | * may still exist in local DMA zone. | |
2106 | */ | |
2107 | static int node_order[MAX_NUMNODES]; | |
2108 | ||
2109 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
2110 | { | |
2111 | enum zone_type i; | |
2112 | int pos, j, node; | |
2113 | int zone_type; /* needs to be signed */ | |
2114 | struct zone *z; | |
2115 | struct zonelist *zonelist; | |
2116 | ||
2117 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2118 | zonelist = pgdat->node_zonelists + i; | |
2119 | pos = 0; | |
2120 | for (zone_type = i; zone_type >= 0; zone_type--) { | |
2121 | for (j = 0; j < nr_nodes; j++) { | |
2122 | node = node_order[j]; | |
2123 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
2124 | if (populated_zone(z)) { | |
2125 | zonelist->zones[pos++] = z; | |
2126 | check_highest_zone(zone_type); | |
2127 | } | |
2128 | } | |
2129 | } | |
2130 | zonelist->zones[pos] = NULL; | |
2131 | } | |
2132 | } | |
2133 | ||
2134 | static int default_zonelist_order(void) | |
2135 | { | |
2136 | int nid, zone_type; | |
2137 | unsigned long low_kmem_size,total_size; | |
2138 | struct zone *z; | |
2139 | int average_size; | |
2140 | /* | |
2141 | * ZONE_DMA and ZONE_DMA32 can be very small area in the sytem. | |
2142 | * If they are really small and used heavily, the system can fall | |
2143 | * into OOM very easily. | |
2144 | * This function detect ZONE_DMA/DMA32 size and confgigures zone order. | |
2145 | */ | |
2146 | /* Is there ZONE_NORMAL ? (ex. ppc has only DMA zone..) */ | |
2147 | low_kmem_size = 0; | |
2148 | total_size = 0; | |
2149 | for_each_online_node(nid) { | |
2150 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2151 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2152 | if (populated_zone(z)) { | |
2153 | if (zone_type < ZONE_NORMAL) | |
2154 | low_kmem_size += z->present_pages; | |
2155 | total_size += z->present_pages; | |
2156 | } | |
2157 | } | |
2158 | } | |
2159 | if (!low_kmem_size || /* there are no DMA area. */ | |
2160 | low_kmem_size > total_size/2) /* DMA/DMA32 is big. */ | |
2161 | return ZONELIST_ORDER_NODE; | |
2162 | /* | |
2163 | * look into each node's config. | |
2164 | * If there is a node whose DMA/DMA32 memory is very big area on | |
2165 | * local memory, NODE_ORDER may be suitable. | |
2166 | */ | |
37b07e41 LS |
2167 | average_size = total_size / |
2168 | (nodes_weight(node_states[N_HIGH_MEMORY]) + 1); | |
f0c0b2b8 KH |
2169 | for_each_online_node(nid) { |
2170 | low_kmem_size = 0; | |
2171 | total_size = 0; | |
2172 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2173 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2174 | if (populated_zone(z)) { | |
2175 | if (zone_type < ZONE_NORMAL) | |
2176 | low_kmem_size += z->present_pages; | |
2177 | total_size += z->present_pages; | |
2178 | } | |
2179 | } | |
2180 | if (low_kmem_size && | |
2181 | total_size > average_size && /* ignore small node */ | |
2182 | low_kmem_size > total_size * 70/100) | |
2183 | return ZONELIST_ORDER_NODE; | |
2184 | } | |
2185 | return ZONELIST_ORDER_ZONE; | |
2186 | } | |
2187 | ||
2188 | static void set_zonelist_order(void) | |
2189 | { | |
2190 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
2191 | current_zonelist_order = default_zonelist_order(); | |
2192 | else | |
2193 | current_zonelist_order = user_zonelist_order; | |
2194 | } | |
2195 | ||
2196 | static void build_zonelists(pg_data_t *pgdat) | |
2197 | { | |
2198 | int j, node, load; | |
2199 | enum zone_type i; | |
1da177e4 | 2200 | nodemask_t used_mask; |
f0c0b2b8 KH |
2201 | int local_node, prev_node; |
2202 | struct zonelist *zonelist; | |
2203 | int order = current_zonelist_order; | |
1da177e4 LT |
2204 | |
2205 | /* initialize zonelists */ | |
523b9458 | 2206 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 LT |
2207 | zonelist = pgdat->node_zonelists + i; |
2208 | zonelist->zones[0] = NULL; | |
2209 | } | |
2210 | ||
2211 | /* NUMA-aware ordering of nodes */ | |
2212 | local_node = pgdat->node_id; | |
2213 | load = num_online_nodes(); | |
2214 | prev_node = local_node; | |
2215 | nodes_clear(used_mask); | |
f0c0b2b8 KH |
2216 | |
2217 | memset(node_load, 0, sizeof(node_load)); | |
2218 | memset(node_order, 0, sizeof(node_order)); | |
2219 | j = 0; | |
2220 | ||
1da177e4 | 2221 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
9eeff239 CL |
2222 | int distance = node_distance(local_node, node); |
2223 | ||
2224 | /* | |
2225 | * If another node is sufficiently far away then it is better | |
2226 | * to reclaim pages in a zone before going off node. | |
2227 | */ | |
2228 | if (distance > RECLAIM_DISTANCE) | |
2229 | zone_reclaim_mode = 1; | |
2230 | ||
1da177e4 LT |
2231 | /* |
2232 | * We don't want to pressure a particular node. | |
2233 | * So adding penalty to the first node in same | |
2234 | * distance group to make it round-robin. | |
2235 | */ | |
9eeff239 | 2236 | if (distance != node_distance(local_node, prev_node)) |
f0c0b2b8 KH |
2237 | node_load[node] = load; |
2238 | ||
1da177e4 LT |
2239 | prev_node = node; |
2240 | load--; | |
f0c0b2b8 KH |
2241 | if (order == ZONELIST_ORDER_NODE) |
2242 | build_zonelists_in_node_order(pgdat, node); | |
2243 | else | |
2244 | node_order[j++] = node; /* remember order */ | |
2245 | } | |
1da177e4 | 2246 | |
f0c0b2b8 KH |
2247 | if (order == ZONELIST_ORDER_ZONE) { |
2248 | /* calculate node order -- i.e., DMA last! */ | |
2249 | build_zonelists_in_zone_order(pgdat, j); | |
1da177e4 | 2250 | } |
523b9458 CL |
2251 | |
2252 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
2253 | } |
2254 | ||
9276b1bc | 2255 | /* Construct the zonelist performance cache - see further mmzone.h */ |
f0c0b2b8 | 2256 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc PJ |
2257 | { |
2258 | int i; | |
2259 | ||
2260 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2261 | struct zonelist *zonelist; | |
2262 | struct zonelist_cache *zlc; | |
2263 | struct zone **z; | |
2264 | ||
2265 | zonelist = pgdat->node_zonelists + i; | |
2266 | zonelist->zlcache_ptr = zlc = &zonelist->zlcache; | |
2267 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); | |
2268 | for (z = zonelist->zones; *z; z++) | |
2269 | zlc->z_to_n[z - zonelist->zones] = zone_to_nid(*z); | |
2270 | } | |
2271 | } | |
2272 | ||
f0c0b2b8 | 2273 | |
1da177e4 LT |
2274 | #else /* CONFIG_NUMA */ |
2275 | ||
f0c0b2b8 KH |
2276 | static void set_zonelist_order(void) |
2277 | { | |
2278 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
2279 | } | |
2280 | ||
2281 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 2282 | { |
19655d34 CL |
2283 | int node, local_node; |
2284 | enum zone_type i,j; | |
1da177e4 LT |
2285 | |
2286 | local_node = pgdat->node_id; | |
19655d34 | 2287 | for (i = 0; i < MAX_NR_ZONES; i++) { |
1da177e4 LT |
2288 | struct zonelist *zonelist; |
2289 | ||
2290 | zonelist = pgdat->node_zonelists + i; | |
2291 | ||
19655d34 | 2292 | j = build_zonelists_node(pgdat, zonelist, 0, i); |
1da177e4 LT |
2293 | /* |
2294 | * Now we build the zonelist so that it contains the zones | |
2295 | * of all the other nodes. | |
2296 | * We don't want to pressure a particular node, so when | |
2297 | * building the zones for node N, we make sure that the | |
2298 | * zones coming right after the local ones are those from | |
2299 | * node N+1 (modulo N) | |
2300 | */ | |
2301 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
2302 | if (!node_online(node)) | |
2303 | continue; | |
19655d34 | 2304 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); |
1da177e4 LT |
2305 | } |
2306 | for (node = 0; node < local_node; node++) { | |
2307 | if (!node_online(node)) | |
2308 | continue; | |
19655d34 | 2309 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); |
1da177e4 LT |
2310 | } |
2311 | ||
2312 | zonelist->zones[j] = NULL; | |
2313 | } | |
2314 | } | |
2315 | ||
9276b1bc | 2316 | /* non-NUMA variant of zonelist performance cache - just NULL zlcache_ptr */ |
f0c0b2b8 | 2317 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc PJ |
2318 | { |
2319 | int i; | |
2320 | ||
2321 | for (i = 0; i < MAX_NR_ZONES; i++) | |
2322 | pgdat->node_zonelists[i].zlcache_ptr = NULL; | |
2323 | } | |
2324 | ||
1da177e4 LT |
2325 | #endif /* CONFIG_NUMA */ |
2326 | ||
6811378e | 2327 | /* return values int ....just for stop_machine_run() */ |
f0c0b2b8 | 2328 | static int __build_all_zonelists(void *dummy) |
1da177e4 | 2329 | { |
6811378e | 2330 | int nid; |
9276b1bc PJ |
2331 | |
2332 | for_each_online_node(nid) { | |
7ea1530a CL |
2333 | pg_data_t *pgdat = NODE_DATA(nid); |
2334 | ||
2335 | build_zonelists(pgdat); | |
2336 | build_zonelist_cache(pgdat); | |
9276b1bc | 2337 | } |
6811378e YG |
2338 | return 0; |
2339 | } | |
2340 | ||
f0c0b2b8 | 2341 | void build_all_zonelists(void) |
6811378e | 2342 | { |
f0c0b2b8 KH |
2343 | set_zonelist_order(); |
2344 | ||
6811378e | 2345 | if (system_state == SYSTEM_BOOTING) { |
423b41d7 | 2346 | __build_all_zonelists(NULL); |
6811378e YG |
2347 | cpuset_init_current_mems_allowed(); |
2348 | } else { | |
2349 | /* we have to stop all cpus to guaranntee there is no user | |
2350 | of zonelist */ | |
2351 | stop_machine_run(__build_all_zonelists, NULL, NR_CPUS); | |
2352 | /* cpuset refresh routine should be here */ | |
2353 | } | |
bd1e22b8 | 2354 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
2355 | /* |
2356 | * Disable grouping by mobility if the number of pages in the | |
2357 | * system is too low to allow the mechanism to work. It would be | |
2358 | * more accurate, but expensive to check per-zone. This check is | |
2359 | * made on memory-hotadd so a system can start with mobility | |
2360 | * disabled and enable it later | |
2361 | */ | |
d9c23400 | 2362 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
2363 | page_group_by_mobility_disabled = 1; |
2364 | else | |
2365 | page_group_by_mobility_disabled = 0; | |
2366 | ||
2367 | printk("Built %i zonelists in %s order, mobility grouping %s. " | |
2368 | "Total pages: %ld\n", | |
f0c0b2b8 KH |
2369 | num_online_nodes(), |
2370 | zonelist_order_name[current_zonelist_order], | |
9ef9acb0 | 2371 | page_group_by_mobility_disabled ? "off" : "on", |
f0c0b2b8 KH |
2372 | vm_total_pages); |
2373 | #ifdef CONFIG_NUMA | |
2374 | printk("Policy zone: %s\n", zone_names[policy_zone]); | |
2375 | #endif | |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | /* | |
2379 | * Helper functions to size the waitqueue hash table. | |
2380 | * Essentially these want to choose hash table sizes sufficiently | |
2381 | * large so that collisions trying to wait on pages are rare. | |
2382 | * But in fact, the number of active page waitqueues on typical | |
2383 | * systems is ridiculously low, less than 200. So this is even | |
2384 | * conservative, even though it seems large. | |
2385 | * | |
2386 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
2387 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
2388 | */ | |
2389 | #define PAGES_PER_WAITQUEUE 256 | |
2390 | ||
cca448fe | 2391 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 2392 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
2393 | { |
2394 | unsigned long size = 1; | |
2395 | ||
2396 | pages /= PAGES_PER_WAITQUEUE; | |
2397 | ||
2398 | while (size < pages) | |
2399 | size <<= 1; | |
2400 | ||
2401 | /* | |
2402 | * Once we have dozens or even hundreds of threads sleeping | |
2403 | * on IO we've got bigger problems than wait queue collision. | |
2404 | * Limit the size of the wait table to a reasonable size. | |
2405 | */ | |
2406 | size = min(size, 4096UL); | |
2407 | ||
2408 | return max(size, 4UL); | |
2409 | } | |
cca448fe YG |
2410 | #else |
2411 | /* | |
2412 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
2413 | * a suitable size for its wait_table. So we use the maximum size now. | |
2414 | * | |
2415 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
2416 | * | |
2417 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
2418 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
2419 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
2420 | * | |
2421 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
2422 | * or more by the traditional way. (See above). It equals: | |
2423 | * | |
2424 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
2425 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
2426 | * powerpc (64K page size) : = (32G +16M)byte. | |
2427 | */ | |
2428 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
2429 | { | |
2430 | return 4096UL; | |
2431 | } | |
2432 | #endif | |
1da177e4 LT |
2433 | |
2434 | /* | |
2435 | * This is an integer logarithm so that shifts can be used later | |
2436 | * to extract the more random high bits from the multiplicative | |
2437 | * hash function before the remainder is taken. | |
2438 | */ | |
2439 | static inline unsigned long wait_table_bits(unsigned long size) | |
2440 | { | |
2441 | return ffz(~size); | |
2442 | } | |
2443 | ||
2444 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
2445 | ||
56fd56b8 | 2446 | /* |
d9c23400 | 2447 | * Mark a number of pageblocks as MIGRATE_RESERVE. The number |
56fd56b8 MG |
2448 | * of blocks reserved is based on zone->pages_min. The memory within the |
2449 | * reserve will tend to store contiguous free pages. Setting min_free_kbytes | |
2450 | * higher will lead to a bigger reserve which will get freed as contiguous | |
2451 | * blocks as reclaim kicks in | |
2452 | */ | |
2453 | static void setup_zone_migrate_reserve(struct zone *zone) | |
2454 | { | |
2455 | unsigned long start_pfn, pfn, end_pfn; | |
2456 | struct page *page; | |
2457 | unsigned long reserve, block_migratetype; | |
2458 | ||
2459 | /* Get the start pfn, end pfn and the number of blocks to reserve */ | |
2460 | start_pfn = zone->zone_start_pfn; | |
2461 | end_pfn = start_pfn + zone->spanned_pages; | |
d9c23400 MG |
2462 | reserve = roundup(zone->pages_min, pageblock_nr_pages) >> |
2463 | pageblock_order; | |
56fd56b8 | 2464 | |
d9c23400 | 2465 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
56fd56b8 MG |
2466 | if (!pfn_valid(pfn)) |
2467 | continue; | |
2468 | page = pfn_to_page(pfn); | |
2469 | ||
2470 | /* Blocks with reserved pages will never free, skip them. */ | |
2471 | if (PageReserved(page)) | |
2472 | continue; | |
2473 | ||
2474 | block_migratetype = get_pageblock_migratetype(page); | |
2475 | ||
2476 | /* If this block is reserved, account for it */ | |
2477 | if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) { | |
2478 | reserve--; | |
2479 | continue; | |
2480 | } | |
2481 | ||
2482 | /* Suitable for reserving if this block is movable */ | |
2483 | if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) { | |
2484 | set_pageblock_migratetype(page, MIGRATE_RESERVE); | |
2485 | move_freepages_block(zone, page, MIGRATE_RESERVE); | |
2486 | reserve--; | |
2487 | continue; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * If the reserve is met and this is a previous reserved block, | |
2492 | * take it back | |
2493 | */ | |
2494 | if (block_migratetype == MIGRATE_RESERVE) { | |
2495 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
2496 | move_freepages_block(zone, page, MIGRATE_MOVABLE); | |
2497 | } | |
2498 | } | |
2499 | } | |
ac0e5b7a | 2500 | |
1da177e4 LT |
2501 | /* |
2502 | * Initially all pages are reserved - free ones are freed | |
2503 | * up by free_all_bootmem() once the early boot process is | |
2504 | * done. Non-atomic initialization, single-pass. | |
2505 | */ | |
c09b4240 | 2506 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 2507 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 2508 | { |
1da177e4 | 2509 | struct page *page; |
29751f69 AW |
2510 | unsigned long end_pfn = start_pfn + size; |
2511 | unsigned long pfn; | |
1da177e4 | 2512 | |
cbe8dd4a | 2513 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 DH |
2514 | /* |
2515 | * There can be holes in boot-time mem_map[]s | |
2516 | * handed to this function. They do not | |
2517 | * exist on hotplugged memory. | |
2518 | */ | |
2519 | if (context == MEMMAP_EARLY) { | |
2520 | if (!early_pfn_valid(pfn)) | |
2521 | continue; | |
2522 | if (!early_pfn_in_nid(pfn, nid)) | |
2523 | continue; | |
2524 | } | |
d41dee36 AW |
2525 | page = pfn_to_page(pfn); |
2526 | set_page_links(page, zone, nid, pfn); | |
7835e98b | 2527 | init_page_count(page); |
1da177e4 LT |
2528 | reset_page_mapcount(page); |
2529 | SetPageReserved(page); | |
b2a0ac88 MG |
2530 | |
2531 | /* | |
2532 | * Mark the block movable so that blocks are reserved for | |
2533 | * movable at startup. This will force kernel allocations | |
2534 | * to reserve their blocks rather than leaking throughout | |
2535 | * the address space during boot when many long-lived | |
56fd56b8 MG |
2536 | * kernel allocations are made. Later some blocks near |
2537 | * the start are marked MIGRATE_RESERVE by | |
2538 | * setup_zone_migrate_reserve() | |
b2a0ac88 | 2539 | */ |
d9c23400 | 2540 | if ((pfn & (pageblock_nr_pages-1))) |
56fd56b8 | 2541 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
b2a0ac88 | 2542 | |
1da177e4 LT |
2543 | INIT_LIST_HEAD(&page->lru); |
2544 | #ifdef WANT_PAGE_VIRTUAL | |
2545 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
2546 | if (!is_highmem_idx(zone)) | |
3212c6be | 2547 | set_page_address(page, __va(pfn << PAGE_SHIFT)); |
1da177e4 | 2548 | #endif |
1da177e4 LT |
2549 | } |
2550 | } | |
2551 | ||
6ea6e688 PM |
2552 | static void __meminit zone_init_free_lists(struct pglist_data *pgdat, |
2553 | struct zone *zone, unsigned long size) | |
1da177e4 | 2554 | { |
b2a0ac88 MG |
2555 | int order, t; |
2556 | for_each_migratetype_order(order, t) { | |
2557 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
2558 | zone->free_area[order].nr_free = 0; |
2559 | } | |
2560 | } | |
2561 | ||
2562 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
2563 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 2564 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
2565 | #endif |
2566 | ||
d09c6b80 | 2567 | static int __devinit zone_batchsize(struct zone *zone) |
e7c8d5c9 CL |
2568 | { |
2569 | int batch; | |
2570 | ||
2571 | /* | |
2572 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 2573 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
2574 | * |
2575 | * OK, so we don't know how big the cache is. So guess. | |
2576 | */ | |
2577 | batch = zone->present_pages / 1024; | |
ba56e91c SR |
2578 | if (batch * PAGE_SIZE > 512 * 1024) |
2579 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
2580 | batch /= 4; /* We effectively *= 4 below */ |
2581 | if (batch < 1) | |
2582 | batch = 1; | |
2583 | ||
2584 | /* | |
0ceaacc9 NP |
2585 | * Clamp the batch to a 2^n - 1 value. Having a power |
2586 | * of 2 value was found to be more likely to have | |
2587 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 2588 | * |
0ceaacc9 NP |
2589 | * For example if 2 tasks are alternately allocating |
2590 | * batches of pages, one task can end up with a lot | |
2591 | * of pages of one half of the possible page colors | |
2592 | * and the other with pages of the other colors. | |
e7c8d5c9 | 2593 | */ |
0ceaacc9 | 2594 | batch = (1 << (fls(batch + batch/2)-1)) - 1; |
ba56e91c | 2595 | |
e7c8d5c9 CL |
2596 | return batch; |
2597 | } | |
2598 | ||
2caaad41 CL |
2599 | inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
2600 | { | |
2601 | struct per_cpu_pages *pcp; | |
2602 | ||
1c6fe946 MD |
2603 | memset(p, 0, sizeof(*p)); |
2604 | ||
2caaad41 CL |
2605 | pcp = &p->pcp[0]; /* hot */ |
2606 | pcp->count = 0; | |
2caaad41 CL |
2607 | pcp->high = 6 * batch; |
2608 | pcp->batch = max(1UL, 1 * batch); | |
2609 | INIT_LIST_HEAD(&pcp->list); | |
2610 | ||
2611 | pcp = &p->pcp[1]; /* cold*/ | |
2612 | pcp->count = 0; | |
2caaad41 | 2613 | pcp->high = 2 * batch; |
e46a5e28 | 2614 | pcp->batch = max(1UL, batch/2); |
2caaad41 CL |
2615 | INIT_LIST_HEAD(&pcp->list); |
2616 | } | |
2617 | ||
8ad4b1fb RS |
2618 | /* |
2619 | * setup_pagelist_highmark() sets the high water mark for hot per_cpu_pagelist | |
2620 | * to the value high for the pageset p. | |
2621 | */ | |
2622 | ||
2623 | static void setup_pagelist_highmark(struct per_cpu_pageset *p, | |
2624 | unsigned long high) | |
2625 | { | |
2626 | struct per_cpu_pages *pcp; | |
2627 | ||
2628 | pcp = &p->pcp[0]; /* hot list */ | |
2629 | pcp->high = high; | |
2630 | pcp->batch = max(1UL, high/4); | |
2631 | if ((high/4) > (PAGE_SHIFT * 8)) | |
2632 | pcp->batch = PAGE_SHIFT * 8; | |
2633 | } | |
2634 | ||
2635 | ||
e7c8d5c9 CL |
2636 | #ifdef CONFIG_NUMA |
2637 | /* | |
2caaad41 CL |
2638 | * Boot pageset table. One per cpu which is going to be used for all |
2639 | * zones and all nodes. The parameters will be set in such a way | |
2640 | * that an item put on a list will immediately be handed over to | |
2641 | * the buddy list. This is safe since pageset manipulation is done | |
2642 | * with interrupts disabled. | |
2643 | * | |
2644 | * Some NUMA counter updates may also be caught by the boot pagesets. | |
b7c84c6a CL |
2645 | * |
2646 | * The boot_pagesets must be kept even after bootup is complete for | |
2647 | * unused processors and/or zones. They do play a role for bootstrapping | |
2648 | * hotplugged processors. | |
2649 | * | |
2650 | * zoneinfo_show() and maybe other functions do | |
2651 | * not check if the processor is online before following the pageset pointer. | |
2652 | * Other parts of the kernel may not check if the zone is available. | |
2caaad41 | 2653 | */ |
88a2a4ac | 2654 | static struct per_cpu_pageset boot_pageset[NR_CPUS]; |
2caaad41 CL |
2655 | |
2656 | /* | |
2657 | * Dynamically allocate memory for the | |
e7c8d5c9 CL |
2658 | * per cpu pageset array in struct zone. |
2659 | */ | |
6292d9aa | 2660 | static int __cpuinit process_zones(int cpu) |
e7c8d5c9 CL |
2661 | { |
2662 | struct zone *zone, *dzone; | |
37c0708d CL |
2663 | int node = cpu_to_node(cpu); |
2664 | ||
2665 | node_set_state(node, N_CPU); /* this node has a cpu */ | |
e7c8d5c9 CL |
2666 | |
2667 | for_each_zone(zone) { | |
e7c8d5c9 | 2668 | |
66a55030 CL |
2669 | if (!populated_zone(zone)) |
2670 | continue; | |
2671 | ||
23316bc8 | 2672 | zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset), |
37c0708d | 2673 | GFP_KERNEL, node); |
23316bc8 | 2674 | if (!zone_pcp(zone, cpu)) |
e7c8d5c9 | 2675 | goto bad; |
e7c8d5c9 | 2676 | |
23316bc8 | 2677 | setup_pageset(zone_pcp(zone, cpu), zone_batchsize(zone)); |
8ad4b1fb RS |
2678 | |
2679 | if (percpu_pagelist_fraction) | |
2680 | setup_pagelist_highmark(zone_pcp(zone, cpu), | |
2681 | (zone->present_pages / percpu_pagelist_fraction)); | |
e7c8d5c9 CL |
2682 | } |
2683 | ||
2684 | return 0; | |
2685 | bad: | |
2686 | for_each_zone(dzone) { | |
64191688 AM |
2687 | if (!populated_zone(dzone)) |
2688 | continue; | |
e7c8d5c9 CL |
2689 | if (dzone == zone) |
2690 | break; | |
23316bc8 NP |
2691 | kfree(zone_pcp(dzone, cpu)); |
2692 | zone_pcp(dzone, cpu) = NULL; | |
e7c8d5c9 CL |
2693 | } |
2694 | return -ENOMEM; | |
2695 | } | |
2696 | ||
2697 | static inline void free_zone_pagesets(int cpu) | |
2698 | { | |
e7c8d5c9 CL |
2699 | struct zone *zone; |
2700 | ||
2701 | for_each_zone(zone) { | |
2702 | struct per_cpu_pageset *pset = zone_pcp(zone, cpu); | |
2703 | ||
f3ef9ead DR |
2704 | /* Free per_cpu_pageset if it is slab allocated */ |
2705 | if (pset != &boot_pageset[cpu]) | |
2706 | kfree(pset); | |
e7c8d5c9 | 2707 | zone_pcp(zone, cpu) = NULL; |
e7c8d5c9 | 2708 | } |
e7c8d5c9 CL |
2709 | } |
2710 | ||
9c7b216d | 2711 | static int __cpuinit pageset_cpuup_callback(struct notifier_block *nfb, |
e7c8d5c9 CL |
2712 | unsigned long action, |
2713 | void *hcpu) | |
2714 | { | |
2715 | int cpu = (long)hcpu; | |
2716 | int ret = NOTIFY_OK; | |
2717 | ||
2718 | switch (action) { | |
ce421c79 | 2719 | case CPU_UP_PREPARE: |
8bb78442 | 2720 | case CPU_UP_PREPARE_FROZEN: |
ce421c79 AW |
2721 | if (process_zones(cpu)) |
2722 | ret = NOTIFY_BAD; | |
2723 | break; | |
2724 | case CPU_UP_CANCELED: | |
8bb78442 | 2725 | case CPU_UP_CANCELED_FROZEN: |
ce421c79 | 2726 | case CPU_DEAD: |
8bb78442 | 2727 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
2728 | free_zone_pagesets(cpu); |
2729 | break; | |
2730 | default: | |
2731 | break; | |
e7c8d5c9 CL |
2732 | } |
2733 | return ret; | |
2734 | } | |
2735 | ||
74b85f37 | 2736 | static struct notifier_block __cpuinitdata pageset_notifier = |
e7c8d5c9 CL |
2737 | { &pageset_cpuup_callback, NULL, 0 }; |
2738 | ||
78d9955b | 2739 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 CL |
2740 | { |
2741 | int err; | |
2742 | ||
2743 | /* Initialize per_cpu_pageset for cpu 0. | |
2744 | * A cpuup callback will do this for every cpu | |
2745 | * as it comes online | |
2746 | */ | |
2747 | err = process_zones(smp_processor_id()); | |
2748 | BUG_ON(err); | |
2749 | register_cpu_notifier(&pageset_notifier); | |
2750 | } | |
2751 | ||
2752 | #endif | |
2753 | ||
577a32f6 | 2754 | static noinline __init_refok |
cca448fe | 2755 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
2756 | { |
2757 | int i; | |
2758 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe | 2759 | size_t alloc_size; |
ed8ece2e DH |
2760 | |
2761 | /* | |
2762 | * The per-page waitqueue mechanism uses hashed waitqueues | |
2763 | * per zone. | |
2764 | */ | |
02b694de YG |
2765 | zone->wait_table_hash_nr_entries = |
2766 | wait_table_hash_nr_entries(zone_size_pages); | |
2767 | zone->wait_table_bits = | |
2768 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
2769 | alloc_size = zone->wait_table_hash_nr_entries |
2770 | * sizeof(wait_queue_head_t); | |
2771 | ||
2772 | if (system_state == SYSTEM_BOOTING) { | |
2773 | zone->wait_table = (wait_queue_head_t *) | |
2774 | alloc_bootmem_node(pgdat, alloc_size); | |
2775 | } else { | |
2776 | /* | |
2777 | * This case means that a zone whose size was 0 gets new memory | |
2778 | * via memory hot-add. | |
2779 | * But it may be the case that a new node was hot-added. In | |
2780 | * this case vmalloc() will not be able to use this new node's | |
2781 | * memory - this wait_table must be initialized to use this new | |
2782 | * node itself as well. | |
2783 | * To use this new node's memory, further consideration will be | |
2784 | * necessary. | |
2785 | */ | |
8691f3a7 | 2786 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
2787 | } |
2788 | if (!zone->wait_table) | |
2789 | return -ENOMEM; | |
ed8ece2e | 2790 | |
02b694de | 2791 | for(i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 2792 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
2793 | |
2794 | return 0; | |
ed8ece2e DH |
2795 | } |
2796 | ||
c09b4240 | 2797 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e DH |
2798 | { |
2799 | int cpu; | |
2800 | unsigned long batch = zone_batchsize(zone); | |
2801 | ||
2802 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
2803 | #ifdef CONFIG_NUMA | |
2804 | /* Early boot. Slab allocator not functional yet */ | |
23316bc8 | 2805 | zone_pcp(zone, cpu) = &boot_pageset[cpu]; |
ed8ece2e DH |
2806 | setup_pageset(&boot_pageset[cpu],0); |
2807 | #else | |
2808 | setup_pageset(zone_pcp(zone,cpu), batch); | |
2809 | #endif | |
2810 | } | |
f5335c0f AB |
2811 | if (zone->present_pages) |
2812 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n", | |
2813 | zone->name, zone->present_pages, batch); | |
ed8ece2e DH |
2814 | } |
2815 | ||
718127cc YG |
2816 | __meminit int init_currently_empty_zone(struct zone *zone, |
2817 | unsigned long zone_start_pfn, | |
a2f3aa02 DH |
2818 | unsigned long size, |
2819 | enum memmap_context context) | |
ed8ece2e DH |
2820 | { |
2821 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
2822 | int ret; |
2823 | ret = zone_wait_table_init(zone, size); | |
2824 | if (ret) | |
2825 | return ret; | |
ed8ece2e DH |
2826 | pgdat->nr_zones = zone_idx(zone) + 1; |
2827 | ||
ed8ece2e DH |
2828 | zone->zone_start_pfn = zone_start_pfn; |
2829 | ||
2830 | memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn); | |
2831 | ||
2832 | zone_init_free_lists(pgdat, zone, zone->spanned_pages); | |
718127cc YG |
2833 | |
2834 | return 0; | |
ed8ece2e DH |
2835 | } |
2836 | ||
c713216d MG |
2837 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
2838 | /* | |
2839 | * Basic iterator support. Return the first range of PFNs for a node | |
2840 | * Note: nid == MAX_NUMNODES returns first region regardless of node | |
2841 | */ | |
a3142c8e | 2842 | static int __meminit first_active_region_index_in_nid(int nid) |
c713216d MG |
2843 | { |
2844 | int i; | |
2845 | ||
2846 | for (i = 0; i < nr_nodemap_entries; i++) | |
2847 | if (nid == MAX_NUMNODES || early_node_map[i].nid == nid) | |
2848 | return i; | |
2849 | ||
2850 | return -1; | |
2851 | } | |
2852 | ||
2853 | /* | |
2854 | * Basic iterator support. Return the next active range of PFNs for a node | |
2855 | * Note: nid == MAX_NUMNODES returns next region regardles of node | |
2856 | */ | |
a3142c8e | 2857 | static int __meminit next_active_region_index_in_nid(int index, int nid) |
c713216d MG |
2858 | { |
2859 | for (index = index + 1; index < nr_nodemap_entries; index++) | |
2860 | if (nid == MAX_NUMNODES || early_node_map[index].nid == nid) | |
2861 | return index; | |
2862 | ||
2863 | return -1; | |
2864 | } | |
2865 | ||
2866 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID | |
2867 | /* | |
2868 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
2869 | * Architectures may implement their own version but if add_active_range() | |
2870 | * was used and there are no special requirements, this is a convenient | |
2871 | * alternative | |
2872 | */ | |
6f076f5d | 2873 | int __meminit early_pfn_to_nid(unsigned long pfn) |
c713216d MG |
2874 | { |
2875 | int i; | |
2876 | ||
2877 | for (i = 0; i < nr_nodemap_entries; i++) { | |
2878 | unsigned long start_pfn = early_node_map[i].start_pfn; | |
2879 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
2880 | ||
2881 | if (start_pfn <= pfn && pfn < end_pfn) | |
2882 | return early_node_map[i].nid; | |
2883 | } | |
2884 | ||
2885 | return 0; | |
2886 | } | |
2887 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
2888 | ||
2889 | /* Basic iterator support to walk early_node_map[] */ | |
2890 | #define for_each_active_range_index_in_nid(i, nid) \ | |
2891 | for (i = first_active_region_index_in_nid(nid); i != -1; \ | |
2892 | i = next_active_region_index_in_nid(i, nid)) | |
2893 | ||
2894 | /** | |
2895 | * free_bootmem_with_active_regions - Call free_bootmem_node for each active range | |
88ca3b94 RD |
2896 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
2897 | * @max_low_pfn: The highest PFN that will be passed to free_bootmem_node | |
c713216d MG |
2898 | * |
2899 | * If an architecture guarantees that all ranges registered with | |
2900 | * add_active_ranges() contain no holes and may be freed, this | |
2901 | * this function may be used instead of calling free_bootmem() manually. | |
2902 | */ | |
2903 | void __init free_bootmem_with_active_regions(int nid, | |
2904 | unsigned long max_low_pfn) | |
2905 | { | |
2906 | int i; | |
2907 | ||
2908 | for_each_active_range_index_in_nid(i, nid) { | |
2909 | unsigned long size_pages = 0; | |
2910 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
2911 | ||
2912 | if (early_node_map[i].start_pfn >= max_low_pfn) | |
2913 | continue; | |
2914 | ||
2915 | if (end_pfn > max_low_pfn) | |
2916 | end_pfn = max_low_pfn; | |
2917 | ||
2918 | size_pages = end_pfn - early_node_map[i].start_pfn; | |
2919 | free_bootmem_node(NODE_DATA(early_node_map[i].nid), | |
2920 | PFN_PHYS(early_node_map[i].start_pfn), | |
2921 | size_pages << PAGE_SHIFT); | |
2922 | } | |
2923 | } | |
2924 | ||
2925 | /** | |
2926 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 2927 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d MG |
2928 | * |
2929 | * If an architecture guarantees that all ranges registered with | |
2930 | * add_active_ranges() contain no holes and may be freed, this | |
88ca3b94 | 2931 | * function may be used instead of calling memory_present() manually. |
c713216d MG |
2932 | */ |
2933 | void __init sparse_memory_present_with_active_regions(int nid) | |
2934 | { | |
2935 | int i; | |
2936 | ||
2937 | for_each_active_range_index_in_nid(i, nid) | |
2938 | memory_present(early_node_map[i].nid, | |
2939 | early_node_map[i].start_pfn, | |
2940 | early_node_map[i].end_pfn); | |
2941 | } | |
2942 | ||
fb01439c MG |
2943 | /** |
2944 | * push_node_boundaries - Push node boundaries to at least the requested boundary | |
2945 | * @nid: The nid of the node to push the boundary for | |
2946 | * @start_pfn: The start pfn of the node | |
2947 | * @end_pfn: The end pfn of the node | |
2948 | * | |
2949 | * In reserve-based hot-add, mem_map is allocated that is unused until hotadd | |
2950 | * time. Specifically, on x86_64, SRAT will report ranges that can potentially | |
2951 | * be hotplugged even though no physical memory exists. This function allows | |
2952 | * an arch to push out the node boundaries so mem_map is allocated that can | |
2953 | * be used later. | |
2954 | */ | |
2955 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE | |
2956 | void __init push_node_boundaries(unsigned int nid, | |
2957 | unsigned long start_pfn, unsigned long end_pfn) | |
2958 | { | |
2959 | printk(KERN_DEBUG "Entering push_node_boundaries(%u, %lu, %lu)\n", | |
2960 | nid, start_pfn, end_pfn); | |
2961 | ||
2962 | /* Initialise the boundary for this node if necessary */ | |
2963 | if (node_boundary_end_pfn[nid] == 0) | |
2964 | node_boundary_start_pfn[nid] = -1UL; | |
2965 | ||
2966 | /* Update the boundaries */ | |
2967 | if (node_boundary_start_pfn[nid] > start_pfn) | |
2968 | node_boundary_start_pfn[nid] = start_pfn; | |
2969 | if (node_boundary_end_pfn[nid] < end_pfn) | |
2970 | node_boundary_end_pfn[nid] = end_pfn; | |
2971 | } | |
2972 | ||
2973 | /* If necessary, push the node boundary out for reserve hotadd */ | |
98011f56 | 2974 | static void __meminit account_node_boundary(unsigned int nid, |
fb01439c MG |
2975 | unsigned long *start_pfn, unsigned long *end_pfn) |
2976 | { | |
2977 | printk(KERN_DEBUG "Entering account_node_boundary(%u, %lu, %lu)\n", | |
2978 | nid, *start_pfn, *end_pfn); | |
2979 | ||
2980 | /* Return if boundary information has not been provided */ | |
2981 | if (node_boundary_end_pfn[nid] == 0) | |
2982 | return; | |
2983 | ||
2984 | /* Check the boundaries and update if necessary */ | |
2985 | if (node_boundary_start_pfn[nid] < *start_pfn) | |
2986 | *start_pfn = node_boundary_start_pfn[nid]; | |
2987 | if (node_boundary_end_pfn[nid] > *end_pfn) | |
2988 | *end_pfn = node_boundary_end_pfn[nid]; | |
2989 | } | |
2990 | #else | |
2991 | void __init push_node_boundaries(unsigned int nid, | |
2992 | unsigned long start_pfn, unsigned long end_pfn) {} | |
2993 | ||
98011f56 | 2994 | static void __meminit account_node_boundary(unsigned int nid, |
fb01439c MG |
2995 | unsigned long *start_pfn, unsigned long *end_pfn) {} |
2996 | #endif | |
2997 | ||
2998 | ||
c713216d MG |
2999 | /** |
3000 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
3001 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
3002 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
3003 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
3004 | * |
3005 | * It returns the start and end page frame of a node based on information | |
3006 | * provided by an arch calling add_active_range(). If called for a node | |
3007 | * with no available memory, a warning is printed and the start and end | |
88ca3b94 | 3008 | * PFNs will be 0. |
c713216d | 3009 | */ |
a3142c8e | 3010 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
3011 | unsigned long *start_pfn, unsigned long *end_pfn) |
3012 | { | |
3013 | int i; | |
3014 | *start_pfn = -1UL; | |
3015 | *end_pfn = 0; | |
3016 | ||
3017 | for_each_active_range_index_in_nid(i, nid) { | |
3018 | *start_pfn = min(*start_pfn, early_node_map[i].start_pfn); | |
3019 | *end_pfn = max(*end_pfn, early_node_map[i].end_pfn); | |
3020 | } | |
3021 | ||
633c0666 | 3022 | if (*start_pfn == -1UL) |
c713216d | 3023 | *start_pfn = 0; |
fb01439c MG |
3024 | |
3025 | /* Push the node boundaries out if requested */ | |
3026 | account_node_boundary(nid, start_pfn, end_pfn); | |
c713216d MG |
3027 | } |
3028 | ||
2a1e274a MG |
3029 | /* |
3030 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
3031 | * assumption is made that zones within a node are ordered in monotonic | |
3032 | * increasing memory addresses so that the "highest" populated zone is used | |
3033 | */ | |
3034 | void __init find_usable_zone_for_movable(void) | |
3035 | { | |
3036 | int zone_index; | |
3037 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
3038 | if (zone_index == ZONE_MOVABLE) | |
3039 | continue; | |
3040 | ||
3041 | if (arch_zone_highest_possible_pfn[zone_index] > | |
3042 | arch_zone_lowest_possible_pfn[zone_index]) | |
3043 | break; | |
3044 | } | |
3045 | ||
3046 | VM_BUG_ON(zone_index == -1); | |
3047 | movable_zone = zone_index; | |
3048 | } | |
3049 | ||
3050 | /* | |
3051 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
3052 | * because it is sized independant of architecture. Unlike the other zones, | |
3053 | * the starting point for ZONE_MOVABLE is not fixed. It may be different | |
3054 | * in each node depending on the size of each node and how evenly kernelcore | |
3055 | * is distributed. This helper function adjusts the zone ranges | |
3056 | * provided by the architecture for a given node by using the end of the | |
3057 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
3058 | * zones within a node are in order of monotonic increases memory addresses | |
3059 | */ | |
3060 | void __meminit adjust_zone_range_for_zone_movable(int nid, | |
3061 | unsigned long zone_type, | |
3062 | unsigned long node_start_pfn, | |
3063 | unsigned long node_end_pfn, | |
3064 | unsigned long *zone_start_pfn, | |
3065 | unsigned long *zone_end_pfn) | |
3066 | { | |
3067 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
3068 | if (zone_movable_pfn[nid]) { | |
3069 | /* Size ZONE_MOVABLE */ | |
3070 | if (zone_type == ZONE_MOVABLE) { | |
3071 | *zone_start_pfn = zone_movable_pfn[nid]; | |
3072 | *zone_end_pfn = min(node_end_pfn, | |
3073 | arch_zone_highest_possible_pfn[movable_zone]); | |
3074 | ||
3075 | /* Adjust for ZONE_MOVABLE starting within this range */ | |
3076 | } else if (*zone_start_pfn < zone_movable_pfn[nid] && | |
3077 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
3078 | *zone_end_pfn = zone_movable_pfn[nid]; | |
3079 | ||
3080 | /* Check if this whole range is within ZONE_MOVABLE */ | |
3081 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
3082 | *zone_start_pfn = *zone_end_pfn; | |
3083 | } | |
3084 | } | |
3085 | ||
c713216d MG |
3086 | /* |
3087 | * Return the number of pages a zone spans in a node, including holes | |
3088 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
3089 | */ | |
6ea6e688 | 3090 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3091 | unsigned long zone_type, |
3092 | unsigned long *ignored) | |
3093 | { | |
3094 | unsigned long node_start_pfn, node_end_pfn; | |
3095 | unsigned long zone_start_pfn, zone_end_pfn; | |
3096 | ||
3097 | /* Get the start and end of the node and zone */ | |
3098 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3099 | zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; | |
3100 | zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
3101 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3102 | node_start_pfn, node_end_pfn, | |
3103 | &zone_start_pfn, &zone_end_pfn); | |
c713216d MG |
3104 | |
3105 | /* Check that this node has pages within the zone's required range */ | |
3106 | if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) | |
3107 | return 0; | |
3108 | ||
3109 | /* Move the zone boundaries inside the node if necessary */ | |
3110 | zone_end_pfn = min(zone_end_pfn, node_end_pfn); | |
3111 | zone_start_pfn = max(zone_start_pfn, node_start_pfn); | |
3112 | ||
3113 | /* Return the spanned pages */ | |
3114 | return zone_end_pfn - zone_start_pfn; | |
3115 | } | |
3116 | ||
3117 | /* | |
3118 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 3119 | * then all holes in the requested range will be accounted for. |
c713216d | 3120 | */ |
a3142c8e | 3121 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
3122 | unsigned long range_start_pfn, |
3123 | unsigned long range_end_pfn) | |
3124 | { | |
3125 | int i = 0; | |
3126 | unsigned long prev_end_pfn = 0, hole_pages = 0; | |
3127 | unsigned long start_pfn; | |
3128 | ||
3129 | /* Find the end_pfn of the first active range of pfns in the node */ | |
3130 | i = first_active_region_index_in_nid(nid); | |
3131 | if (i == -1) | |
3132 | return 0; | |
3133 | ||
b5445f95 MG |
3134 | prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn); |
3135 | ||
9c7cd687 MG |
3136 | /* Account for ranges before physical memory on this node */ |
3137 | if (early_node_map[i].start_pfn > range_start_pfn) | |
b5445f95 | 3138 | hole_pages = prev_end_pfn - range_start_pfn; |
c713216d MG |
3139 | |
3140 | /* Find all holes for the zone within the node */ | |
3141 | for (; i != -1; i = next_active_region_index_in_nid(i, nid)) { | |
3142 | ||
3143 | /* No need to continue if prev_end_pfn is outside the zone */ | |
3144 | if (prev_end_pfn >= range_end_pfn) | |
3145 | break; | |
3146 | ||
3147 | /* Make sure the end of the zone is not within the hole */ | |
3148 | start_pfn = min(early_node_map[i].start_pfn, range_end_pfn); | |
3149 | prev_end_pfn = max(prev_end_pfn, range_start_pfn); | |
3150 | ||
3151 | /* Update the hole size cound and move on */ | |
3152 | if (start_pfn > range_start_pfn) { | |
3153 | BUG_ON(prev_end_pfn > start_pfn); | |
3154 | hole_pages += start_pfn - prev_end_pfn; | |
3155 | } | |
3156 | prev_end_pfn = early_node_map[i].end_pfn; | |
3157 | } | |
3158 | ||
9c7cd687 MG |
3159 | /* Account for ranges past physical memory on this node */ |
3160 | if (range_end_pfn > prev_end_pfn) | |
0c6cb974 | 3161 | hole_pages += range_end_pfn - |
9c7cd687 MG |
3162 | max(range_start_pfn, prev_end_pfn); |
3163 | ||
c713216d MG |
3164 | return hole_pages; |
3165 | } | |
3166 | ||
3167 | /** | |
3168 | * absent_pages_in_range - Return number of page frames in holes within a range | |
3169 | * @start_pfn: The start PFN to start searching for holes | |
3170 | * @end_pfn: The end PFN to stop searching for holes | |
3171 | * | |
88ca3b94 | 3172 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
3173 | */ |
3174 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
3175 | unsigned long end_pfn) | |
3176 | { | |
3177 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
3178 | } | |
3179 | ||
3180 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 3181 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3182 | unsigned long zone_type, |
3183 | unsigned long *ignored) | |
3184 | { | |
9c7cd687 MG |
3185 | unsigned long node_start_pfn, node_end_pfn; |
3186 | unsigned long zone_start_pfn, zone_end_pfn; | |
3187 | ||
3188 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3189 | zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type], | |
3190 | node_start_pfn); | |
3191 | zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type], | |
3192 | node_end_pfn); | |
3193 | ||
2a1e274a MG |
3194 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3195 | node_start_pfn, node_end_pfn, | |
3196 | &zone_start_pfn, &zone_end_pfn); | |
9c7cd687 | 3197 | return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
c713216d | 3198 | } |
0e0b864e | 3199 | |
c713216d | 3200 | #else |
6ea6e688 | 3201 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3202 | unsigned long zone_type, |
3203 | unsigned long *zones_size) | |
3204 | { | |
3205 | return zones_size[zone_type]; | |
3206 | } | |
3207 | ||
6ea6e688 | 3208 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3209 | unsigned long zone_type, |
3210 | unsigned long *zholes_size) | |
3211 | { | |
3212 | if (!zholes_size) | |
3213 | return 0; | |
3214 | ||
3215 | return zholes_size[zone_type]; | |
3216 | } | |
0e0b864e | 3217 | |
c713216d MG |
3218 | #endif |
3219 | ||
a3142c8e | 3220 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
c713216d MG |
3221 | unsigned long *zones_size, unsigned long *zholes_size) |
3222 | { | |
3223 | unsigned long realtotalpages, totalpages = 0; | |
3224 | enum zone_type i; | |
3225 | ||
3226 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3227 | totalpages += zone_spanned_pages_in_node(pgdat->node_id, i, | |
3228 | zones_size); | |
3229 | pgdat->node_spanned_pages = totalpages; | |
3230 | ||
3231 | realtotalpages = totalpages; | |
3232 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3233 | realtotalpages -= | |
3234 | zone_absent_pages_in_node(pgdat->node_id, i, | |
3235 | zholes_size); | |
3236 | pgdat->node_present_pages = realtotalpages; | |
3237 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
3238 | realtotalpages); | |
3239 | } | |
3240 | ||
835c134e MG |
3241 | #ifndef CONFIG_SPARSEMEM |
3242 | /* | |
3243 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
3244 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
3245 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
3246 | * round what is now in bits to nearest long in bits, then return it in |
3247 | * bytes. | |
3248 | */ | |
3249 | static unsigned long __init usemap_size(unsigned long zonesize) | |
3250 | { | |
3251 | unsigned long usemapsize; | |
3252 | ||
d9c23400 MG |
3253 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
3254 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
3255 | usemapsize *= NR_PAGEBLOCK_BITS; |
3256 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
3257 | ||
3258 | return usemapsize / 8; | |
3259 | } | |
3260 | ||
3261 | static void __init setup_usemap(struct pglist_data *pgdat, | |
3262 | struct zone *zone, unsigned long zonesize) | |
3263 | { | |
3264 | unsigned long usemapsize = usemap_size(zonesize); | |
3265 | zone->pageblock_flags = NULL; | |
3266 | if (usemapsize) { | |
3267 | zone->pageblock_flags = alloc_bootmem_node(pgdat, usemapsize); | |
3268 | memset(zone->pageblock_flags, 0, usemapsize); | |
3269 | } | |
3270 | } | |
3271 | #else | |
3272 | static void inline setup_usemap(struct pglist_data *pgdat, | |
3273 | struct zone *zone, unsigned long zonesize) {} | |
3274 | #endif /* CONFIG_SPARSEMEM */ | |
3275 | ||
d9c23400 MG |
3276 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
3277 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ | |
3278 | static inline void __init set_pageblock_order(unsigned int order) | |
3279 | { | |
3280 | /* Check that pageblock_nr_pages has not already been setup */ | |
3281 | if (pageblock_order) | |
3282 | return; | |
3283 | ||
3284 | /* | |
3285 | * Assume the largest contiguous order of interest is a huge page. | |
3286 | * This value may be variable depending on boot parameters on IA64 | |
3287 | */ | |
3288 | pageblock_order = order; | |
3289 | } | |
3290 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
3291 | ||
3292 | /* Defined this way to avoid accidently referencing HUGETLB_PAGE_ORDER */ | |
3293 | #define set_pageblock_order(x) do {} while (0) | |
3294 | ||
3295 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
3296 | ||
1da177e4 LT |
3297 | /* |
3298 | * Set up the zone data structures: | |
3299 | * - mark all pages reserved | |
3300 | * - mark all memory queues empty | |
3301 | * - clear the memory bitmaps | |
3302 | */ | |
86356ab1 | 3303 | static void __meminit free_area_init_core(struct pglist_data *pgdat, |
1da177e4 LT |
3304 | unsigned long *zones_size, unsigned long *zholes_size) |
3305 | { | |
2f1b6248 | 3306 | enum zone_type j; |
ed8ece2e | 3307 | int nid = pgdat->node_id; |
1da177e4 | 3308 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
718127cc | 3309 | int ret; |
1da177e4 | 3310 | |
208d54e5 | 3311 | pgdat_resize_init(pgdat); |
1da177e4 LT |
3312 | pgdat->nr_zones = 0; |
3313 | init_waitqueue_head(&pgdat->kswapd_wait); | |
3314 | pgdat->kswapd_max_order = 0; | |
3315 | ||
3316 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
3317 | struct zone *zone = pgdat->node_zones + j; | |
0e0b864e | 3318 | unsigned long size, realsize, memmap_pages; |
1da177e4 | 3319 | |
c713216d MG |
3320 | size = zone_spanned_pages_in_node(nid, j, zones_size); |
3321 | realsize = size - zone_absent_pages_in_node(nid, j, | |
3322 | zholes_size); | |
1da177e4 | 3323 | |
0e0b864e MG |
3324 | /* |
3325 | * Adjust realsize so that it accounts for how much memory | |
3326 | * is used by this zone for memmap. This affects the watermark | |
3327 | * and per-cpu initialisations | |
3328 | */ | |
3329 | memmap_pages = (size * sizeof(struct page)) >> PAGE_SHIFT; | |
3330 | if (realsize >= memmap_pages) { | |
3331 | realsize -= memmap_pages; | |
3332 | printk(KERN_DEBUG | |
3333 | " %s zone: %lu pages used for memmap\n", | |
3334 | zone_names[j], memmap_pages); | |
3335 | } else | |
3336 | printk(KERN_WARNING | |
3337 | " %s zone: %lu pages exceeds realsize %lu\n", | |
3338 | zone_names[j], memmap_pages, realsize); | |
3339 | ||
6267276f CL |
3340 | /* Account for reserved pages */ |
3341 | if (j == 0 && realsize > dma_reserve) { | |
0e0b864e | 3342 | realsize -= dma_reserve; |
6267276f CL |
3343 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
3344 | zone_names[0], dma_reserve); | |
0e0b864e MG |
3345 | } |
3346 | ||
98d2b0eb | 3347 | if (!is_highmem_idx(j)) |
1da177e4 LT |
3348 | nr_kernel_pages += realsize; |
3349 | nr_all_pages += realsize; | |
3350 | ||
3351 | zone->spanned_pages = size; | |
3352 | zone->present_pages = realsize; | |
9614634f | 3353 | #ifdef CONFIG_NUMA |
d5f541ed | 3354 | zone->node = nid; |
8417bba4 | 3355 | zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio) |
9614634f | 3356 | / 100; |
0ff38490 | 3357 | zone->min_slab_pages = (realsize * sysctl_min_slab_ratio) / 100; |
9614634f | 3358 | #endif |
1da177e4 LT |
3359 | zone->name = zone_names[j]; |
3360 | spin_lock_init(&zone->lock); | |
3361 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 3362 | zone_seqlock_init(zone); |
1da177e4 | 3363 | zone->zone_pgdat = pgdat; |
1da177e4 | 3364 | |
3bb1a852 | 3365 | zone->prev_priority = DEF_PRIORITY; |
1da177e4 | 3366 | |
ed8ece2e | 3367 | zone_pcp_init(zone); |
1da177e4 LT |
3368 | INIT_LIST_HEAD(&zone->active_list); |
3369 | INIT_LIST_HEAD(&zone->inactive_list); | |
3370 | zone->nr_scan_active = 0; | |
3371 | zone->nr_scan_inactive = 0; | |
2244b95a | 3372 | zap_zone_vm_stats(zone); |
53e9a615 | 3373 | atomic_set(&zone->reclaim_in_progress, 0); |
1da177e4 LT |
3374 | if (!size) |
3375 | continue; | |
3376 | ||
d9c23400 | 3377 | set_pageblock_order(HUGETLB_PAGE_ORDER); |
835c134e | 3378 | setup_usemap(pgdat, zone, size); |
a2f3aa02 DH |
3379 | ret = init_currently_empty_zone(zone, zone_start_pfn, |
3380 | size, MEMMAP_EARLY); | |
718127cc | 3381 | BUG_ON(ret); |
1da177e4 | 3382 | zone_start_pfn += size; |
1da177e4 LT |
3383 | } |
3384 | } | |
3385 | ||
577a32f6 | 3386 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 3387 | { |
1da177e4 LT |
3388 | /* Skip empty nodes */ |
3389 | if (!pgdat->node_spanned_pages) | |
3390 | return; | |
3391 | ||
d41dee36 | 3392 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 LT |
3393 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
3394 | if (!pgdat->node_mem_map) { | |
e984bb43 | 3395 | unsigned long size, start, end; |
d41dee36 AW |
3396 | struct page *map; |
3397 | ||
e984bb43 BP |
3398 | /* |
3399 | * The zone's endpoints aren't required to be MAX_ORDER | |
3400 | * aligned but the node_mem_map endpoints must be in order | |
3401 | * for the buddy allocator to function correctly. | |
3402 | */ | |
3403 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); | |
3404 | end = pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
3405 | end = ALIGN(end, MAX_ORDER_NR_PAGES); | |
3406 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
3407 | map = alloc_remap(pgdat->node_id, size); |
3408 | if (!map) | |
3409 | map = alloc_bootmem_node(pgdat, size); | |
e984bb43 | 3410 | pgdat->node_mem_map = map + (pgdat->node_start_pfn - start); |
1da177e4 | 3411 | } |
12d810c1 | 3412 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
3413 | /* |
3414 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
3415 | */ | |
c713216d | 3416 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 3417 | mem_map = NODE_DATA(0)->node_mem_map; |
c713216d MG |
3418 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
3419 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) | |
3420 | mem_map -= pgdat->node_start_pfn; | |
3421 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ | |
3422 | } | |
1da177e4 | 3423 | #endif |
d41dee36 | 3424 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
3425 | } |
3426 | ||
86356ab1 | 3427 | void __meminit free_area_init_node(int nid, struct pglist_data *pgdat, |
1da177e4 LT |
3428 | unsigned long *zones_size, unsigned long node_start_pfn, |
3429 | unsigned long *zholes_size) | |
3430 | { | |
3431 | pgdat->node_id = nid; | |
3432 | pgdat->node_start_pfn = node_start_pfn; | |
c713216d | 3433 | calculate_node_totalpages(pgdat, zones_size, zholes_size); |
1da177e4 LT |
3434 | |
3435 | alloc_node_mem_map(pgdat); | |
3436 | ||
3437 | free_area_init_core(pgdat, zones_size, zholes_size); | |
3438 | } | |
3439 | ||
c713216d | 3440 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
418508c1 MS |
3441 | |
3442 | #if MAX_NUMNODES > 1 | |
3443 | /* | |
3444 | * Figure out the number of possible node ids. | |
3445 | */ | |
3446 | static void __init setup_nr_node_ids(void) | |
3447 | { | |
3448 | unsigned int node; | |
3449 | unsigned int highest = 0; | |
3450 | ||
3451 | for_each_node_mask(node, node_possible_map) | |
3452 | highest = node; | |
3453 | nr_node_ids = highest + 1; | |
3454 | } | |
3455 | #else | |
3456 | static inline void setup_nr_node_ids(void) | |
3457 | { | |
3458 | } | |
3459 | #endif | |
3460 | ||
c713216d MG |
3461 | /** |
3462 | * add_active_range - Register a range of PFNs backed by physical memory | |
3463 | * @nid: The node ID the range resides on | |
3464 | * @start_pfn: The start PFN of the available physical memory | |
3465 | * @end_pfn: The end PFN of the available physical memory | |
3466 | * | |
3467 | * These ranges are stored in an early_node_map[] and later used by | |
3468 | * free_area_init_nodes() to calculate zone sizes and holes. If the | |
3469 | * range spans a memory hole, it is up to the architecture to ensure | |
3470 | * the memory is not freed by the bootmem allocator. If possible | |
3471 | * the range being registered will be merged with existing ranges. | |
3472 | */ | |
3473 | void __init add_active_range(unsigned int nid, unsigned long start_pfn, | |
3474 | unsigned long end_pfn) | |
3475 | { | |
3476 | int i; | |
3477 | ||
3478 | printk(KERN_DEBUG "Entering add_active_range(%d, %lu, %lu) " | |
3479 | "%d entries of %d used\n", | |
3480 | nid, start_pfn, end_pfn, | |
3481 | nr_nodemap_entries, MAX_ACTIVE_REGIONS); | |
3482 | ||
3483 | /* Merge with existing active regions if possible */ | |
3484 | for (i = 0; i < nr_nodemap_entries; i++) { | |
3485 | if (early_node_map[i].nid != nid) | |
3486 | continue; | |
3487 | ||
3488 | /* Skip if an existing region covers this new one */ | |
3489 | if (start_pfn >= early_node_map[i].start_pfn && | |
3490 | end_pfn <= early_node_map[i].end_pfn) | |
3491 | return; | |
3492 | ||
3493 | /* Merge forward if suitable */ | |
3494 | if (start_pfn <= early_node_map[i].end_pfn && | |
3495 | end_pfn > early_node_map[i].end_pfn) { | |
3496 | early_node_map[i].end_pfn = end_pfn; | |
3497 | return; | |
3498 | } | |
3499 | ||
3500 | /* Merge backward if suitable */ | |
3501 | if (start_pfn < early_node_map[i].end_pfn && | |
3502 | end_pfn >= early_node_map[i].start_pfn) { | |
3503 | early_node_map[i].start_pfn = start_pfn; | |
3504 | return; | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | /* Check that early_node_map is large enough */ | |
3509 | if (i >= MAX_ACTIVE_REGIONS) { | |
3510 | printk(KERN_CRIT "More than %d memory regions, truncating\n", | |
3511 | MAX_ACTIVE_REGIONS); | |
3512 | return; | |
3513 | } | |
3514 | ||
3515 | early_node_map[i].nid = nid; | |
3516 | early_node_map[i].start_pfn = start_pfn; | |
3517 | early_node_map[i].end_pfn = end_pfn; | |
3518 | nr_nodemap_entries = i + 1; | |
3519 | } | |
3520 | ||
3521 | /** | |
3522 | * shrink_active_range - Shrink an existing registered range of PFNs | |
3523 | * @nid: The node id the range is on that should be shrunk | |
3524 | * @old_end_pfn: The old end PFN of the range | |
3525 | * @new_end_pfn: The new PFN of the range | |
3526 | * | |
3527 | * i386 with NUMA use alloc_remap() to store a node_mem_map on a local node. | |
3528 | * The map is kept at the end physical page range that has already been | |
3529 | * registered with add_active_range(). This function allows an arch to shrink | |
3530 | * an existing registered range. | |
3531 | */ | |
3532 | void __init shrink_active_range(unsigned int nid, unsigned long old_end_pfn, | |
3533 | unsigned long new_end_pfn) | |
3534 | { | |
3535 | int i; | |
3536 | ||
3537 | /* Find the old active region end and shrink */ | |
3538 | for_each_active_range_index_in_nid(i, nid) | |
3539 | if (early_node_map[i].end_pfn == old_end_pfn) { | |
3540 | early_node_map[i].end_pfn = new_end_pfn; | |
3541 | break; | |
3542 | } | |
3543 | } | |
3544 | ||
3545 | /** | |
3546 | * remove_all_active_ranges - Remove all currently registered regions | |
88ca3b94 | 3547 | * |
c713216d MG |
3548 | * During discovery, it may be found that a table like SRAT is invalid |
3549 | * and an alternative discovery method must be used. This function removes | |
3550 | * all currently registered regions. | |
3551 | */ | |
88ca3b94 | 3552 | void __init remove_all_active_ranges(void) |
c713216d MG |
3553 | { |
3554 | memset(early_node_map, 0, sizeof(early_node_map)); | |
3555 | nr_nodemap_entries = 0; | |
fb01439c MG |
3556 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE |
3557 | memset(node_boundary_start_pfn, 0, sizeof(node_boundary_start_pfn)); | |
3558 | memset(node_boundary_end_pfn, 0, sizeof(node_boundary_end_pfn)); | |
3559 | #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */ | |
c713216d MG |
3560 | } |
3561 | ||
3562 | /* Compare two active node_active_regions */ | |
3563 | static int __init cmp_node_active_region(const void *a, const void *b) | |
3564 | { | |
3565 | struct node_active_region *arange = (struct node_active_region *)a; | |
3566 | struct node_active_region *brange = (struct node_active_region *)b; | |
3567 | ||
3568 | /* Done this way to avoid overflows */ | |
3569 | if (arange->start_pfn > brange->start_pfn) | |
3570 | return 1; | |
3571 | if (arange->start_pfn < brange->start_pfn) | |
3572 | return -1; | |
3573 | ||
3574 | return 0; | |
3575 | } | |
3576 | ||
3577 | /* sort the node_map by start_pfn */ | |
3578 | static void __init sort_node_map(void) | |
3579 | { | |
3580 | sort(early_node_map, (size_t)nr_nodemap_entries, | |
3581 | sizeof(struct node_active_region), | |
3582 | cmp_node_active_region, NULL); | |
3583 | } | |
3584 | ||
a6af2bc3 | 3585 | /* Find the lowest pfn for a node */ |
c713216d MG |
3586 | unsigned long __init find_min_pfn_for_node(unsigned long nid) |
3587 | { | |
3588 | int i; | |
a6af2bc3 | 3589 | unsigned long min_pfn = ULONG_MAX; |
1abbfb41 | 3590 | |
c713216d MG |
3591 | /* Assuming a sorted map, the first range found has the starting pfn */ |
3592 | for_each_active_range_index_in_nid(i, nid) | |
a6af2bc3 | 3593 | min_pfn = min(min_pfn, early_node_map[i].start_pfn); |
c713216d | 3594 | |
a6af2bc3 MG |
3595 | if (min_pfn == ULONG_MAX) { |
3596 | printk(KERN_WARNING | |
3597 | "Could not find start_pfn for node %lu\n", nid); | |
3598 | return 0; | |
3599 | } | |
3600 | ||
3601 | return min_pfn; | |
c713216d MG |
3602 | } |
3603 | ||
3604 | /** | |
3605 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
3606 | * | |
3607 | * It returns the minimum PFN based on information provided via | |
88ca3b94 | 3608 | * add_active_range(). |
c713216d MG |
3609 | */ |
3610 | unsigned long __init find_min_pfn_with_active_regions(void) | |
3611 | { | |
3612 | return find_min_pfn_for_node(MAX_NUMNODES); | |
3613 | } | |
3614 | ||
3615 | /** | |
3616 | * find_max_pfn_with_active_regions - Find the maximum PFN registered | |
3617 | * | |
3618 | * It returns the maximum PFN based on information provided via | |
88ca3b94 | 3619 | * add_active_range(). |
c713216d MG |
3620 | */ |
3621 | unsigned long __init find_max_pfn_with_active_regions(void) | |
3622 | { | |
3623 | int i; | |
3624 | unsigned long max_pfn = 0; | |
3625 | ||
3626 | for (i = 0; i < nr_nodemap_entries; i++) | |
3627 | max_pfn = max(max_pfn, early_node_map[i].end_pfn); | |
3628 | ||
3629 | return max_pfn; | |
3630 | } | |
3631 | ||
37b07e41 LS |
3632 | /* |
3633 | * early_calculate_totalpages() | |
3634 | * Sum pages in active regions for movable zone. | |
3635 | * Populate N_HIGH_MEMORY for calculating usable_nodes. | |
3636 | */ | |
484f51f8 | 3637 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef MG |
3638 | { |
3639 | int i; | |
3640 | unsigned long totalpages = 0; | |
3641 | ||
37b07e41 LS |
3642 | for (i = 0; i < nr_nodemap_entries; i++) { |
3643 | unsigned long pages = early_node_map[i].end_pfn - | |
7e63efef | 3644 | early_node_map[i].start_pfn; |
37b07e41 LS |
3645 | totalpages += pages; |
3646 | if (pages) | |
3647 | node_set_state(early_node_map[i].nid, N_HIGH_MEMORY); | |
3648 | } | |
3649 | return totalpages; | |
7e63efef MG |
3650 | } |
3651 | ||
2a1e274a MG |
3652 | /* |
3653 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
3654 | * is spread evenly between nodes as long as the nodes have enough | |
3655 | * memory. When they don't, some nodes will have more kernelcore than | |
3656 | * others | |
3657 | */ | |
3658 | void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn) | |
3659 | { | |
3660 | int i, nid; | |
3661 | unsigned long usable_startpfn; | |
3662 | unsigned long kernelcore_node, kernelcore_remaining; | |
37b07e41 LS |
3663 | unsigned long totalpages = early_calculate_totalpages(); |
3664 | int usable_nodes = nodes_weight(node_states[N_HIGH_MEMORY]); | |
2a1e274a | 3665 | |
7e63efef MG |
3666 | /* |
3667 | * If movablecore was specified, calculate what size of | |
3668 | * kernelcore that corresponds so that memory usable for | |
3669 | * any allocation type is evenly spread. If both kernelcore | |
3670 | * and movablecore are specified, then the value of kernelcore | |
3671 | * will be used for required_kernelcore if it's greater than | |
3672 | * what movablecore would have allowed. | |
3673 | */ | |
3674 | if (required_movablecore) { | |
7e63efef MG |
3675 | unsigned long corepages; |
3676 | ||
3677 | /* | |
3678 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
3679 | * was requested by the user | |
3680 | */ | |
3681 | required_movablecore = | |
3682 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
3683 | corepages = totalpages - required_movablecore; | |
3684 | ||
3685 | required_kernelcore = max(required_kernelcore, corepages); | |
3686 | } | |
3687 | ||
2a1e274a MG |
3688 | /* If kernelcore was not specified, there is no ZONE_MOVABLE */ |
3689 | if (!required_kernelcore) | |
3690 | return; | |
3691 | ||
3692 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
3693 | find_usable_zone_for_movable(); | |
3694 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; | |
3695 | ||
3696 | restart: | |
3697 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
3698 | kernelcore_node = required_kernelcore / usable_nodes; | |
37b07e41 | 3699 | for_each_node_state(nid, N_HIGH_MEMORY) { |
2a1e274a MG |
3700 | /* |
3701 | * Recalculate kernelcore_node if the division per node | |
3702 | * now exceeds what is necessary to satisfy the requested | |
3703 | * amount of memory for the kernel | |
3704 | */ | |
3705 | if (required_kernelcore < kernelcore_node) | |
3706 | kernelcore_node = required_kernelcore / usable_nodes; | |
3707 | ||
3708 | /* | |
3709 | * As the map is walked, we track how much memory is usable | |
3710 | * by the kernel using kernelcore_remaining. When it is | |
3711 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
3712 | */ | |
3713 | kernelcore_remaining = kernelcore_node; | |
3714 | ||
3715 | /* Go through each range of PFNs within this node */ | |
3716 | for_each_active_range_index_in_nid(i, nid) { | |
3717 | unsigned long start_pfn, end_pfn; | |
3718 | unsigned long size_pages; | |
3719 | ||
3720 | start_pfn = max(early_node_map[i].start_pfn, | |
3721 | zone_movable_pfn[nid]); | |
3722 | end_pfn = early_node_map[i].end_pfn; | |
3723 | if (start_pfn >= end_pfn) | |
3724 | continue; | |
3725 | ||
3726 | /* Account for what is only usable for kernelcore */ | |
3727 | if (start_pfn < usable_startpfn) { | |
3728 | unsigned long kernel_pages; | |
3729 | kernel_pages = min(end_pfn, usable_startpfn) | |
3730 | - start_pfn; | |
3731 | ||
3732 | kernelcore_remaining -= min(kernel_pages, | |
3733 | kernelcore_remaining); | |
3734 | required_kernelcore -= min(kernel_pages, | |
3735 | required_kernelcore); | |
3736 | ||
3737 | /* Continue if range is now fully accounted */ | |
3738 | if (end_pfn <= usable_startpfn) { | |
3739 | ||
3740 | /* | |
3741 | * Push zone_movable_pfn to the end so | |
3742 | * that if we have to rebalance | |
3743 | * kernelcore across nodes, we will | |
3744 | * not double account here | |
3745 | */ | |
3746 | zone_movable_pfn[nid] = end_pfn; | |
3747 | continue; | |
3748 | } | |
3749 | start_pfn = usable_startpfn; | |
3750 | } | |
3751 | ||
3752 | /* | |
3753 | * The usable PFN range for ZONE_MOVABLE is from | |
3754 | * start_pfn->end_pfn. Calculate size_pages as the | |
3755 | * number of pages used as kernelcore | |
3756 | */ | |
3757 | size_pages = end_pfn - start_pfn; | |
3758 | if (size_pages > kernelcore_remaining) | |
3759 | size_pages = kernelcore_remaining; | |
3760 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
3761 | ||
3762 | /* | |
3763 | * Some kernelcore has been met, update counts and | |
3764 | * break if the kernelcore for this node has been | |
3765 | * satisified | |
3766 | */ | |
3767 | required_kernelcore -= min(required_kernelcore, | |
3768 | size_pages); | |
3769 | kernelcore_remaining -= size_pages; | |
3770 | if (!kernelcore_remaining) | |
3771 | break; | |
3772 | } | |
3773 | } | |
3774 | ||
3775 | /* | |
3776 | * If there is still required_kernelcore, we do another pass with one | |
3777 | * less node in the count. This will push zone_movable_pfn[nid] further | |
3778 | * along on the nodes that still have memory until kernelcore is | |
3779 | * satisified | |
3780 | */ | |
3781 | usable_nodes--; | |
3782 | if (usable_nodes && required_kernelcore > usable_nodes) | |
3783 | goto restart; | |
3784 | ||
3785 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ | |
3786 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
3787 | zone_movable_pfn[nid] = | |
3788 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
3789 | } | |
3790 | ||
37b07e41 LS |
3791 | /* Any regular memory on that node ? */ |
3792 | static void check_for_regular_memory(pg_data_t *pgdat) | |
3793 | { | |
3794 | #ifdef CONFIG_HIGHMEM | |
3795 | enum zone_type zone_type; | |
3796 | ||
3797 | for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) { | |
3798 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
3799 | if (zone->present_pages) | |
3800 | node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
3801 | } | |
3802 | #endif | |
3803 | } | |
3804 | ||
c713216d MG |
3805 | /** |
3806 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 3807 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
3808 | * |
3809 | * This will call free_area_init_node() for each active node in the system. | |
3810 | * Using the page ranges provided by add_active_range(), the size of each | |
3811 | * zone in each node and their holes is calculated. If the maximum PFN | |
3812 | * between two adjacent zones match, it is assumed that the zone is empty. | |
3813 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
3814 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
3815 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
3816 | * at arch_max_dma_pfn. | |
3817 | */ | |
3818 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
3819 | { | |
3820 | unsigned long nid; | |
3821 | enum zone_type i; | |
3822 | ||
a6af2bc3 MG |
3823 | /* Sort early_node_map as initialisation assumes it is sorted */ |
3824 | sort_node_map(); | |
3825 | ||
c713216d MG |
3826 | /* Record where the zone boundaries are */ |
3827 | memset(arch_zone_lowest_possible_pfn, 0, | |
3828 | sizeof(arch_zone_lowest_possible_pfn)); | |
3829 | memset(arch_zone_highest_possible_pfn, 0, | |
3830 | sizeof(arch_zone_highest_possible_pfn)); | |
3831 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); | |
3832 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; | |
3833 | for (i = 1; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
3834 | if (i == ZONE_MOVABLE) |
3835 | continue; | |
c713216d MG |
3836 | arch_zone_lowest_possible_pfn[i] = |
3837 | arch_zone_highest_possible_pfn[i-1]; | |
3838 | arch_zone_highest_possible_pfn[i] = | |
3839 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); | |
3840 | } | |
2a1e274a MG |
3841 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
3842 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
3843 | ||
3844 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
3845 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
3846 | find_zone_movable_pfns_for_nodes(zone_movable_pfn); | |
c713216d | 3847 | |
c713216d MG |
3848 | /* Print out the zone ranges */ |
3849 | printk("Zone PFN ranges:\n"); | |
2a1e274a MG |
3850 | for (i = 0; i < MAX_NR_ZONES; i++) { |
3851 | if (i == ZONE_MOVABLE) | |
3852 | continue; | |
c713216d MG |
3853 | printk(" %-8s %8lu -> %8lu\n", |
3854 | zone_names[i], | |
3855 | arch_zone_lowest_possible_pfn[i], | |
3856 | arch_zone_highest_possible_pfn[i]); | |
2a1e274a MG |
3857 | } |
3858 | ||
3859 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
3860 | printk("Movable zone start PFN for each node\n"); | |
3861 | for (i = 0; i < MAX_NUMNODES; i++) { | |
3862 | if (zone_movable_pfn[i]) | |
3863 | printk(" Node %d: %lu\n", i, zone_movable_pfn[i]); | |
3864 | } | |
c713216d MG |
3865 | |
3866 | /* Print out the early_node_map[] */ | |
3867 | printk("early_node_map[%d] active PFN ranges\n", nr_nodemap_entries); | |
3868 | for (i = 0; i < nr_nodemap_entries; i++) | |
3869 | printk(" %3d: %8lu -> %8lu\n", early_node_map[i].nid, | |
3870 | early_node_map[i].start_pfn, | |
3871 | early_node_map[i].end_pfn); | |
3872 | ||
3873 | /* Initialise every node */ | |
8ef82866 | 3874 | setup_nr_node_ids(); |
c713216d MG |
3875 | for_each_online_node(nid) { |
3876 | pg_data_t *pgdat = NODE_DATA(nid); | |
3877 | free_area_init_node(nid, pgdat, NULL, | |
3878 | find_min_pfn_for_node(nid), NULL); | |
37b07e41 LS |
3879 | |
3880 | /* Any memory on that node */ | |
3881 | if (pgdat->node_present_pages) | |
3882 | node_set_state(nid, N_HIGH_MEMORY); | |
3883 | check_for_regular_memory(pgdat); | |
c713216d MG |
3884 | } |
3885 | } | |
2a1e274a | 3886 | |
7e63efef | 3887 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
3888 | { |
3889 | unsigned long long coremem; | |
3890 | if (!p) | |
3891 | return -EINVAL; | |
3892 | ||
3893 | coremem = memparse(p, &p); | |
7e63efef | 3894 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 3895 | |
7e63efef | 3896 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
3897 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
3898 | ||
3899 | return 0; | |
3900 | } | |
ed7ed365 | 3901 | |
7e63efef MG |
3902 | /* |
3903 | * kernelcore=size sets the amount of memory for use for allocations that | |
3904 | * cannot be reclaimed or migrated. | |
3905 | */ | |
3906 | static int __init cmdline_parse_kernelcore(char *p) | |
3907 | { | |
3908 | return cmdline_parse_core(p, &required_kernelcore); | |
3909 | } | |
3910 | ||
3911 | /* | |
3912 | * movablecore=size sets the amount of memory for use for allocations that | |
3913 | * can be reclaimed or migrated. | |
3914 | */ | |
3915 | static int __init cmdline_parse_movablecore(char *p) | |
3916 | { | |
3917 | return cmdline_parse_core(p, &required_movablecore); | |
3918 | } | |
3919 | ||
ed7ed365 | 3920 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 3921 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 3922 | |
c713216d MG |
3923 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
3924 | ||
0e0b864e | 3925 | /** |
88ca3b94 RD |
3926 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
3927 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e MG |
3928 | * |
3929 | * The per-cpu batchsize and zone watermarks are determined by present_pages. | |
3930 | * In the DMA zone, a significant percentage may be consumed by kernel image | |
3931 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
3932 | * function may optionally be used to account for unfreeable pages in the |
3933 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
3934 | * smaller per-cpu batchsize. | |
0e0b864e MG |
3935 | */ |
3936 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
3937 | { | |
3938 | dma_reserve = new_dma_reserve; | |
3939 | } | |
3940 | ||
93b7504e | 3941 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
3942 | static bootmem_data_t contig_bootmem_data; |
3943 | struct pglist_data contig_page_data = { .bdata = &contig_bootmem_data }; | |
3944 | ||
3945 | EXPORT_SYMBOL(contig_page_data); | |
93b7504e | 3946 | #endif |
1da177e4 LT |
3947 | |
3948 | void __init free_area_init(unsigned long *zones_size) | |
3949 | { | |
93b7504e | 3950 | free_area_init_node(0, NODE_DATA(0), zones_size, |
1da177e4 LT |
3951 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
3952 | } | |
1da177e4 | 3953 | |
1da177e4 LT |
3954 | static int page_alloc_cpu_notify(struct notifier_block *self, |
3955 | unsigned long action, void *hcpu) | |
3956 | { | |
3957 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 3958 | |
8bb78442 | 3959 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
1da177e4 LT |
3960 | local_irq_disable(); |
3961 | __drain_pages(cpu); | |
f8891e5e | 3962 | vm_events_fold_cpu(cpu); |
1da177e4 | 3963 | local_irq_enable(); |
2244b95a | 3964 | refresh_cpu_vm_stats(cpu); |
1da177e4 LT |
3965 | } |
3966 | return NOTIFY_OK; | |
3967 | } | |
1da177e4 LT |
3968 | |
3969 | void __init page_alloc_init(void) | |
3970 | { | |
3971 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
3972 | } | |
3973 | ||
cb45b0e9 HA |
3974 | /* |
3975 | * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio | |
3976 | * or min_free_kbytes changes. | |
3977 | */ | |
3978 | static void calculate_totalreserve_pages(void) | |
3979 | { | |
3980 | struct pglist_data *pgdat; | |
3981 | unsigned long reserve_pages = 0; | |
2f6726e5 | 3982 | enum zone_type i, j; |
cb45b0e9 HA |
3983 | |
3984 | for_each_online_pgdat(pgdat) { | |
3985 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
3986 | struct zone *zone = pgdat->node_zones + i; | |
3987 | unsigned long max = 0; | |
3988 | ||
3989 | /* Find valid and maximum lowmem_reserve in the zone */ | |
3990 | for (j = i; j < MAX_NR_ZONES; j++) { | |
3991 | if (zone->lowmem_reserve[j] > max) | |
3992 | max = zone->lowmem_reserve[j]; | |
3993 | } | |
3994 | ||
3995 | /* we treat pages_high as reserved pages. */ | |
3996 | max += zone->pages_high; | |
3997 | ||
3998 | if (max > zone->present_pages) | |
3999 | max = zone->present_pages; | |
4000 | reserve_pages += max; | |
4001 | } | |
4002 | } | |
4003 | totalreserve_pages = reserve_pages; | |
4004 | } | |
4005 | ||
1da177e4 LT |
4006 | /* |
4007 | * setup_per_zone_lowmem_reserve - called whenever | |
4008 | * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone | |
4009 | * has a correct pages reserved value, so an adequate number of | |
4010 | * pages are left in the zone after a successful __alloc_pages(). | |
4011 | */ | |
4012 | static void setup_per_zone_lowmem_reserve(void) | |
4013 | { | |
4014 | struct pglist_data *pgdat; | |
2f6726e5 | 4015 | enum zone_type j, idx; |
1da177e4 | 4016 | |
ec936fc5 | 4017 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
4018 | for (j = 0; j < MAX_NR_ZONES; j++) { |
4019 | struct zone *zone = pgdat->node_zones + j; | |
4020 | unsigned long present_pages = zone->present_pages; | |
4021 | ||
4022 | zone->lowmem_reserve[j] = 0; | |
4023 | ||
2f6726e5 CL |
4024 | idx = j; |
4025 | while (idx) { | |
1da177e4 LT |
4026 | struct zone *lower_zone; |
4027 | ||
2f6726e5 CL |
4028 | idx--; |
4029 | ||
1da177e4 LT |
4030 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
4031 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
4032 | ||
4033 | lower_zone = pgdat->node_zones + idx; | |
4034 | lower_zone->lowmem_reserve[j] = present_pages / | |
4035 | sysctl_lowmem_reserve_ratio[idx]; | |
4036 | present_pages += lower_zone->present_pages; | |
4037 | } | |
4038 | } | |
4039 | } | |
cb45b0e9 HA |
4040 | |
4041 | /* update totalreserve_pages */ | |
4042 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4043 | } |
4044 | ||
88ca3b94 RD |
4045 | /** |
4046 | * setup_per_zone_pages_min - called when min_free_kbytes changes. | |
4047 | * | |
4048 | * Ensures that the pages_{min,low,high} values for each zone are set correctly | |
4049 | * with respect to min_free_kbytes. | |
1da177e4 | 4050 | */ |
3947be19 | 4051 | void setup_per_zone_pages_min(void) |
1da177e4 LT |
4052 | { |
4053 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
4054 | unsigned long lowmem_pages = 0; | |
4055 | struct zone *zone; | |
4056 | unsigned long flags; | |
4057 | ||
4058 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
4059 | for_each_zone(zone) { | |
4060 | if (!is_highmem(zone)) | |
4061 | lowmem_pages += zone->present_pages; | |
4062 | } | |
4063 | ||
4064 | for_each_zone(zone) { | |
ac924c60 AM |
4065 | u64 tmp; |
4066 | ||
1da177e4 | 4067 | spin_lock_irqsave(&zone->lru_lock, flags); |
ac924c60 AM |
4068 | tmp = (u64)pages_min * zone->present_pages; |
4069 | do_div(tmp, lowmem_pages); | |
1da177e4 LT |
4070 | if (is_highmem(zone)) { |
4071 | /* | |
669ed175 NP |
4072 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
4073 | * need highmem pages, so cap pages_min to a small | |
4074 | * value here. | |
4075 | * | |
4076 | * The (pages_high-pages_low) and (pages_low-pages_min) | |
4077 | * deltas controls asynch page reclaim, and so should | |
4078 | * not be capped for highmem. | |
1da177e4 LT |
4079 | */ |
4080 | int min_pages; | |
4081 | ||
4082 | min_pages = zone->present_pages / 1024; | |
4083 | if (min_pages < SWAP_CLUSTER_MAX) | |
4084 | min_pages = SWAP_CLUSTER_MAX; | |
4085 | if (min_pages > 128) | |
4086 | min_pages = 128; | |
4087 | zone->pages_min = min_pages; | |
4088 | } else { | |
669ed175 NP |
4089 | /* |
4090 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
4091 | * proportionate to the zone's size. |
4092 | */ | |
669ed175 | 4093 | zone->pages_min = tmp; |
1da177e4 LT |
4094 | } |
4095 | ||
ac924c60 AM |
4096 | zone->pages_low = zone->pages_min + (tmp >> 2); |
4097 | zone->pages_high = zone->pages_min + (tmp >> 1); | |
56fd56b8 | 4098 | setup_zone_migrate_reserve(zone); |
1da177e4 LT |
4099 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
4100 | } | |
cb45b0e9 HA |
4101 | |
4102 | /* update totalreserve_pages */ | |
4103 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4104 | } |
4105 | ||
4106 | /* | |
4107 | * Initialise min_free_kbytes. | |
4108 | * | |
4109 | * For small machines we want it small (128k min). For large machines | |
4110 | * we want it large (64MB max). But it is not linear, because network | |
4111 | * bandwidth does not increase linearly with machine size. We use | |
4112 | * | |
4113 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: | |
4114 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) | |
4115 | * | |
4116 | * which yields | |
4117 | * | |
4118 | * 16MB: 512k | |
4119 | * 32MB: 724k | |
4120 | * 64MB: 1024k | |
4121 | * 128MB: 1448k | |
4122 | * 256MB: 2048k | |
4123 | * 512MB: 2896k | |
4124 | * 1024MB: 4096k | |
4125 | * 2048MB: 5792k | |
4126 | * 4096MB: 8192k | |
4127 | * 8192MB: 11584k | |
4128 | * 16384MB: 16384k | |
4129 | */ | |
4130 | static int __init init_per_zone_pages_min(void) | |
4131 | { | |
4132 | unsigned long lowmem_kbytes; | |
4133 | ||
4134 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
4135 | ||
4136 | min_free_kbytes = int_sqrt(lowmem_kbytes * 16); | |
4137 | if (min_free_kbytes < 128) | |
4138 | min_free_kbytes = 128; | |
4139 | if (min_free_kbytes > 65536) | |
4140 | min_free_kbytes = 65536; | |
4141 | setup_per_zone_pages_min(); | |
4142 | setup_per_zone_lowmem_reserve(); | |
4143 | return 0; | |
4144 | } | |
4145 | module_init(init_per_zone_pages_min) | |
4146 | ||
4147 | /* | |
4148 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so | |
4149 | * that we can call two helper functions whenever min_free_kbytes | |
4150 | * changes. | |
4151 | */ | |
4152 | int min_free_kbytes_sysctl_handler(ctl_table *table, int write, | |
4153 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4154 | { | |
4155 | proc_dointvec(table, write, file, buffer, length, ppos); | |
3b1d92c5 MG |
4156 | if (write) |
4157 | setup_per_zone_pages_min(); | |
1da177e4 LT |
4158 | return 0; |
4159 | } | |
4160 | ||
9614634f CL |
4161 | #ifdef CONFIG_NUMA |
4162 | int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write, | |
4163 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4164 | { | |
4165 | struct zone *zone; | |
4166 | int rc; | |
4167 | ||
4168 | rc = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4169 | if (rc) | |
4170 | return rc; | |
4171 | ||
4172 | for_each_zone(zone) | |
8417bba4 | 4173 | zone->min_unmapped_pages = (zone->present_pages * |
9614634f CL |
4174 | sysctl_min_unmapped_ratio) / 100; |
4175 | return 0; | |
4176 | } | |
0ff38490 CL |
4177 | |
4178 | int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write, | |
4179 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4180 | { | |
4181 | struct zone *zone; | |
4182 | int rc; | |
4183 | ||
4184 | rc = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4185 | if (rc) | |
4186 | return rc; | |
4187 | ||
4188 | for_each_zone(zone) | |
4189 | zone->min_slab_pages = (zone->present_pages * | |
4190 | sysctl_min_slab_ratio) / 100; | |
4191 | return 0; | |
4192 | } | |
9614634f CL |
4193 | #endif |
4194 | ||
1da177e4 LT |
4195 | /* |
4196 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
4197 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
4198 | * whenever sysctl_lowmem_reserve_ratio changes. | |
4199 | * | |
4200 | * The reserve ratio obviously has absolutely no relation with the | |
4201 | * pages_min watermarks. The lowmem reserve ratio can only make sense | |
4202 | * if in function of the boot time zone sizes. | |
4203 | */ | |
4204 | int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, | |
4205 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4206 | { | |
4207 | proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4208 | setup_per_zone_lowmem_reserve(); | |
4209 | return 0; | |
4210 | } | |
4211 | ||
8ad4b1fb RS |
4212 | /* |
4213 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
4214 | * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist | |
4215 | * can have before it gets flushed back to buddy allocator. | |
4216 | */ | |
4217 | ||
4218 | int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, | |
4219 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4220 | { | |
4221 | struct zone *zone; | |
4222 | unsigned int cpu; | |
4223 | int ret; | |
4224 | ||
4225 | ret = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4226 | if (!write || (ret == -EINVAL)) | |
4227 | return ret; | |
4228 | for_each_zone(zone) { | |
4229 | for_each_online_cpu(cpu) { | |
4230 | unsigned long high; | |
4231 | high = zone->present_pages / percpu_pagelist_fraction; | |
4232 | setup_pagelist_highmark(zone_pcp(zone, cpu), high); | |
4233 | } | |
4234 | } | |
4235 | return 0; | |
4236 | } | |
4237 | ||
f034b5d4 | 4238 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 LT |
4239 | |
4240 | #ifdef CONFIG_NUMA | |
4241 | static int __init set_hashdist(char *str) | |
4242 | { | |
4243 | if (!str) | |
4244 | return 0; | |
4245 | hashdist = simple_strtoul(str, &str, 0); | |
4246 | return 1; | |
4247 | } | |
4248 | __setup("hashdist=", set_hashdist); | |
4249 | #endif | |
4250 | ||
4251 | /* | |
4252 | * allocate a large system hash table from bootmem | |
4253 | * - it is assumed that the hash table must contain an exact power-of-2 | |
4254 | * quantity of entries | |
4255 | * - limit is the number of hash buckets, not the total allocation size | |
4256 | */ | |
4257 | void *__init alloc_large_system_hash(const char *tablename, | |
4258 | unsigned long bucketsize, | |
4259 | unsigned long numentries, | |
4260 | int scale, | |
4261 | int flags, | |
4262 | unsigned int *_hash_shift, | |
4263 | unsigned int *_hash_mask, | |
4264 | unsigned long limit) | |
4265 | { | |
4266 | unsigned long long max = limit; | |
4267 | unsigned long log2qty, size; | |
4268 | void *table = NULL; | |
4269 | ||
4270 | /* allow the kernel cmdline to have a say */ | |
4271 | if (!numentries) { | |
4272 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 4273 | numentries = nr_kernel_pages; |
1da177e4 LT |
4274 | numentries += (1UL << (20 - PAGE_SHIFT)) - 1; |
4275 | numentries >>= 20 - PAGE_SHIFT; | |
4276 | numentries <<= 20 - PAGE_SHIFT; | |
4277 | ||
4278 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
4279 | if (scale > PAGE_SHIFT) | |
4280 | numentries >>= (scale - PAGE_SHIFT); | |
4281 | else | |
4282 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
4283 | |
4284 | /* Make sure we've got at least a 0-order allocation.. */ | |
4285 | if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
4286 | numentries = PAGE_SIZE / bucketsize; | |
1da177e4 | 4287 | } |
6e692ed3 | 4288 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
4289 | |
4290 | /* limit allocation size to 1/16 total memory by default */ | |
4291 | if (max == 0) { | |
4292 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
4293 | do_div(max, bucketsize); | |
4294 | } | |
4295 | ||
4296 | if (numentries > max) | |
4297 | numentries = max; | |
4298 | ||
f0d1b0b3 | 4299 | log2qty = ilog2(numentries); |
1da177e4 LT |
4300 | |
4301 | do { | |
4302 | size = bucketsize << log2qty; | |
4303 | if (flags & HASH_EARLY) | |
4304 | table = alloc_bootmem(size); | |
4305 | else if (hashdist) | |
4306 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
4307 | else { | |
4308 | unsigned long order; | |
4309 | for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++) | |
4310 | ; | |
4311 | table = (void*) __get_free_pages(GFP_ATOMIC, order); | |
1037b83b ED |
4312 | /* |
4313 | * If bucketsize is not a power-of-two, we may free | |
4314 | * some pages at the end of hash table. | |
4315 | */ | |
4316 | if (table) { | |
4317 | unsigned long alloc_end = (unsigned long)table + | |
4318 | (PAGE_SIZE << order); | |
4319 | unsigned long used = (unsigned long)table + | |
4320 | PAGE_ALIGN(size); | |
4321 | split_page(virt_to_page(table), order); | |
4322 | while (used < alloc_end) { | |
4323 | free_page(used); | |
4324 | used += PAGE_SIZE; | |
4325 | } | |
4326 | } | |
1da177e4 LT |
4327 | } |
4328 | } while (!table && size > PAGE_SIZE && --log2qty); | |
4329 | ||
4330 | if (!table) | |
4331 | panic("Failed to allocate %s hash table\n", tablename); | |
4332 | ||
b49ad484 | 4333 | printk(KERN_INFO "%s hash table entries: %d (order: %d, %lu bytes)\n", |
1da177e4 LT |
4334 | tablename, |
4335 | (1U << log2qty), | |
f0d1b0b3 | 4336 | ilog2(size) - PAGE_SHIFT, |
1da177e4 LT |
4337 | size); |
4338 | ||
4339 | if (_hash_shift) | |
4340 | *_hash_shift = log2qty; | |
4341 | if (_hash_mask) | |
4342 | *_hash_mask = (1 << log2qty) - 1; | |
4343 | ||
4344 | return table; | |
4345 | } | |
a117e66e KH |
4346 | |
4347 | #ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE | |
a117e66e KH |
4348 | struct page *pfn_to_page(unsigned long pfn) |
4349 | { | |
67de6482 | 4350 | return __pfn_to_page(pfn); |
a117e66e KH |
4351 | } |
4352 | unsigned long page_to_pfn(struct page *page) | |
4353 | { | |
67de6482 | 4354 | return __page_to_pfn(page); |
a117e66e | 4355 | } |
a117e66e KH |
4356 | EXPORT_SYMBOL(pfn_to_page); |
4357 | EXPORT_SYMBOL(page_to_pfn); | |
4358 | #endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */ | |
6220ec78 | 4359 | |
835c134e MG |
4360 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
4361 | static inline unsigned long *get_pageblock_bitmap(struct zone *zone, | |
4362 | unsigned long pfn) | |
4363 | { | |
4364 | #ifdef CONFIG_SPARSEMEM | |
4365 | return __pfn_to_section(pfn)->pageblock_flags; | |
4366 | #else | |
4367 | return zone->pageblock_flags; | |
4368 | #endif /* CONFIG_SPARSEMEM */ | |
4369 | } | |
4370 | ||
4371 | static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) | |
4372 | { | |
4373 | #ifdef CONFIG_SPARSEMEM | |
4374 | pfn &= (PAGES_PER_SECTION-1); | |
d9c23400 | 4375 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
4376 | #else |
4377 | pfn = pfn - zone->zone_start_pfn; | |
d9c23400 | 4378 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
4379 | #endif /* CONFIG_SPARSEMEM */ |
4380 | } | |
4381 | ||
4382 | /** | |
d9c23400 | 4383 | * get_pageblock_flags_group - Return the requested group of flags for the pageblock_nr_pages block of pages |
835c134e MG |
4384 | * @page: The page within the block of interest |
4385 | * @start_bitidx: The first bit of interest to retrieve | |
4386 | * @end_bitidx: The last bit of interest | |
4387 | * returns pageblock_bits flags | |
4388 | */ | |
4389 | unsigned long get_pageblock_flags_group(struct page *page, | |
4390 | int start_bitidx, int end_bitidx) | |
4391 | { | |
4392 | struct zone *zone; | |
4393 | unsigned long *bitmap; | |
4394 | unsigned long pfn, bitidx; | |
4395 | unsigned long flags = 0; | |
4396 | unsigned long value = 1; | |
4397 | ||
4398 | zone = page_zone(page); | |
4399 | pfn = page_to_pfn(page); | |
4400 | bitmap = get_pageblock_bitmap(zone, pfn); | |
4401 | bitidx = pfn_to_bitidx(zone, pfn); | |
4402 | ||
4403 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
4404 | if (test_bit(bitidx + start_bitidx, bitmap)) | |
4405 | flags |= value; | |
6220ec78 | 4406 | |
835c134e MG |
4407 | return flags; |
4408 | } | |
4409 | ||
4410 | /** | |
d9c23400 | 4411 | * set_pageblock_flags_group - Set the requested group of flags for a pageblock_nr_pages block of pages |
835c134e MG |
4412 | * @page: The page within the block of interest |
4413 | * @start_bitidx: The first bit of interest | |
4414 | * @end_bitidx: The last bit of interest | |
4415 | * @flags: The flags to set | |
4416 | */ | |
4417 | void set_pageblock_flags_group(struct page *page, unsigned long flags, | |
4418 | int start_bitidx, int end_bitidx) | |
4419 | { | |
4420 | struct zone *zone; | |
4421 | unsigned long *bitmap; | |
4422 | unsigned long pfn, bitidx; | |
4423 | unsigned long value = 1; | |
4424 | ||
4425 | zone = page_zone(page); | |
4426 | pfn = page_to_pfn(page); | |
4427 | bitmap = get_pageblock_bitmap(zone, pfn); | |
4428 | bitidx = pfn_to_bitidx(zone, pfn); | |
4429 | ||
4430 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
4431 | if (flags & value) | |
4432 | __set_bit(bitidx + start_bitidx, bitmap); | |
4433 | else | |
4434 | __clear_bit(bitidx + start_bitidx, bitmap); | |
4435 | } |