Commit | Line | Data |
---|---|---|
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 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/stddef.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/swap.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/compiler.h> | |
9f158333 | 25 | #include <linux/kernel.h> |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/suspend.h> | |
28 | #include <linux/pagevec.h> | |
29 | #include <linux/blkdev.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <linux/topology.h> | |
33 | #include <linux/sysctl.h> | |
34 | #include <linux/cpu.h> | |
35 | #include <linux/cpuset.h> | |
bdc8cb98 | 36 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
37 | #include <linux/nodemask.h> |
38 | #include <linux/vmalloc.h> | |
4be38e35 | 39 | #include <linux/mempolicy.h> |
1da177e4 LT |
40 | |
41 | #include <asm/tlbflush.h> | |
42 | #include "internal.h" | |
43 | ||
44 | /* | |
45 | * MCD - HACK: Find somewhere to initialize this EARLY, or make this | |
46 | * initializer cleaner | |
47 | */ | |
c3d8c141 | 48 | nodemask_t node_online_map __read_mostly = { { [0] = 1UL } }; |
7223a93a | 49 | EXPORT_SYMBOL(node_online_map); |
c3d8c141 | 50 | nodemask_t node_possible_map __read_mostly = NODE_MASK_ALL; |
7223a93a | 51 | EXPORT_SYMBOL(node_possible_map); |
c3d8c141 | 52 | struct pglist_data *pgdat_list __read_mostly; |
6c231b7b RT |
53 | unsigned long totalram_pages __read_mostly; |
54 | unsigned long totalhigh_pages __read_mostly; | |
1da177e4 | 55 | long nr_swap_pages; |
8ad4b1fb | 56 | int percpu_pagelist_fraction; |
1da177e4 | 57 | |
a226f6c8 DH |
58 | static void fastcall free_hot_cold_page(struct page *page, int cold); |
59 | ||
1da177e4 LT |
60 | /* |
61 | * results with 256, 32 in the lowmem_reserve sysctl: | |
62 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
63 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
64 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
65 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
66 | * HIGHMEM allocation will (224M+784M)/256 of ram reserved in ZONE_DMA | |
a2f1b424 AK |
67 | * |
68 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
69 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 70 | */ |
a2f1b424 | 71 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { 256, 256, 32 }; |
1da177e4 LT |
72 | |
73 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 LT |
74 | |
75 | /* | |
76 | * Used by page_zone() to look up the address of the struct zone whose | |
77 | * id is encoded in the upper bits of page->flags | |
78 | */ | |
c3d8c141 | 79 | struct zone *zone_table[1 << ZONETABLE_SHIFT] __read_mostly; |
1da177e4 LT |
80 | EXPORT_SYMBOL(zone_table); |
81 | ||
a2f1b424 | 82 | static char *zone_names[MAX_NR_ZONES] = { "DMA", "DMA32", "Normal", "HighMem" }; |
1da177e4 LT |
83 | int min_free_kbytes = 1024; |
84 | ||
85 | unsigned long __initdata nr_kernel_pages; | |
86 | unsigned long __initdata nr_all_pages; | |
87 | ||
13e7444b | 88 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 89 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 90 | { |
bdc8cb98 DH |
91 | int ret = 0; |
92 | unsigned seq; | |
93 | unsigned long pfn = page_to_pfn(page); | |
c6a57e19 | 94 | |
bdc8cb98 DH |
95 | do { |
96 | seq = zone_span_seqbegin(zone); | |
97 | if (pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
98 | ret = 1; | |
99 | else if (pfn < zone->zone_start_pfn) | |
100 | ret = 1; | |
101 | } while (zone_span_seqretry(zone, seq)); | |
102 | ||
103 | return ret; | |
c6a57e19 DH |
104 | } |
105 | ||
106 | static int page_is_consistent(struct zone *zone, struct page *page) | |
107 | { | |
1da177e4 LT |
108 | #ifdef CONFIG_HOLES_IN_ZONE |
109 | if (!pfn_valid(page_to_pfn(page))) | |
c6a57e19 | 110 | return 0; |
1da177e4 LT |
111 | #endif |
112 | if (zone != page_zone(page)) | |
c6a57e19 DH |
113 | return 0; |
114 | ||
115 | return 1; | |
116 | } | |
117 | /* | |
118 | * Temporary debugging check for pages not lying within a given zone. | |
119 | */ | |
120 | static int bad_range(struct zone *zone, struct page *page) | |
121 | { | |
122 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 123 | return 1; |
c6a57e19 DH |
124 | if (!page_is_consistent(zone, page)) |
125 | return 1; | |
126 | ||
1da177e4 LT |
127 | return 0; |
128 | } | |
129 | ||
13e7444b NP |
130 | #else |
131 | static inline int bad_range(struct zone *zone, struct page *page) | |
132 | { | |
133 | return 0; | |
134 | } | |
135 | #endif | |
136 | ||
224abf92 | 137 | static void bad_page(struct page *page) |
1da177e4 | 138 | { |
224abf92 | 139 | printk(KERN_EMERG "Bad page state in process '%s'\n" |
7365f3d1 HD |
140 | KERN_EMERG "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n" |
141 | KERN_EMERG "Trying to fix it up, but a reboot is needed\n" | |
142 | KERN_EMERG "Backtrace:\n", | |
224abf92 NP |
143 | current->comm, page, (int)(2*sizeof(unsigned long)), |
144 | (unsigned long)page->flags, page->mapping, | |
145 | page_mapcount(page), page_count(page)); | |
1da177e4 | 146 | dump_stack(); |
334795ec HD |
147 | page->flags &= ~(1 << PG_lru | |
148 | 1 << PG_private | | |
1da177e4 | 149 | 1 << PG_locked | |
1da177e4 LT |
150 | 1 << PG_active | |
151 | 1 << PG_dirty | | |
334795ec HD |
152 | 1 << PG_reclaim | |
153 | 1 << PG_slab | | |
1da177e4 | 154 | 1 << PG_swapcache | |
689bcebf | 155 | 1 << PG_writeback ); |
1da177e4 LT |
156 | set_page_count(page, 0); |
157 | reset_page_mapcount(page); | |
158 | page->mapping = NULL; | |
9f158333 | 159 | add_taint(TAINT_BAD_PAGE); |
1da177e4 LT |
160 | } |
161 | ||
1da177e4 LT |
162 | /* |
163 | * Higher-order pages are called "compound pages". They are structured thusly: | |
164 | * | |
165 | * The first PAGE_SIZE page is called the "head page". | |
166 | * | |
167 | * The remaining PAGE_SIZE pages are called "tail pages". | |
168 | * | |
169 | * All pages have PG_compound set. All pages have their ->private pointing at | |
170 | * the head page (even the head page has this). | |
171 | * | |
172 | * The first tail page's ->mapping, if non-zero, holds the address of the | |
173 | * compound page's put_page() function. | |
174 | * | |
175 | * The order of the allocation is stored in the first tail page's ->index | |
176 | * This is only for debug at present. This usage means that zero-order pages | |
177 | * may not be compound. | |
178 | */ | |
179 | static void prep_compound_page(struct page *page, unsigned long order) | |
180 | { | |
181 | int i; | |
182 | int nr_pages = 1 << order; | |
183 | ||
184 | page[1].mapping = NULL; | |
185 | page[1].index = order; | |
186 | for (i = 0; i < nr_pages; i++) { | |
187 | struct page *p = page + i; | |
188 | ||
189 | SetPageCompound(p); | |
4c21e2f2 | 190 | set_page_private(p, (unsigned long)page); |
1da177e4 LT |
191 | } |
192 | } | |
193 | ||
194 | static void destroy_compound_page(struct page *page, unsigned long order) | |
195 | { | |
196 | int i; | |
197 | int nr_pages = 1 << order; | |
198 | ||
224abf92 NP |
199 | if (unlikely(page[1].index != order)) |
200 | bad_page(page); | |
1da177e4 LT |
201 | |
202 | for (i = 0; i < nr_pages; i++) { | |
203 | struct page *p = page + i; | |
204 | ||
224abf92 NP |
205 | if (unlikely(!PageCompound(p) | |
206 | (page_private(p) != (unsigned long)page))) | |
207 | bad_page(page); | |
1da177e4 LT |
208 | ClearPageCompound(p); |
209 | } | |
210 | } | |
1da177e4 LT |
211 | |
212 | /* | |
213 | * function for dealing with page's order in buddy system. | |
214 | * zone->lock is already acquired when we use these. | |
215 | * So, we don't need atomic page->flags operations here. | |
216 | */ | |
217 | static inline unsigned long page_order(struct page *page) { | |
4c21e2f2 | 218 | return page_private(page); |
1da177e4 LT |
219 | } |
220 | ||
221 | static inline void set_page_order(struct page *page, int order) { | |
4c21e2f2 | 222 | set_page_private(page, order); |
1da177e4 LT |
223 | __SetPagePrivate(page); |
224 | } | |
225 | ||
226 | static inline void rmv_page_order(struct page *page) | |
227 | { | |
228 | __ClearPagePrivate(page); | |
4c21e2f2 | 229 | set_page_private(page, 0); |
1da177e4 LT |
230 | } |
231 | ||
232 | /* | |
233 | * Locate the struct page for both the matching buddy in our | |
234 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
235 | * | |
236 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
237 | * the following equation: | |
238 | * B2 = B1 ^ (1 << O) | |
239 | * For example, if the starting buddy (buddy2) is #8 its order | |
240 | * 1 buddy is #10: | |
241 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
242 | * | |
243 | * 2) Any buddy B will have an order O+1 parent P which | |
244 | * satisfies the following equation: | |
245 | * P = B & ~(1 << O) | |
246 | * | |
247 | * Assumption: *_mem_map is contigious at least up to MAX_ORDER | |
248 | */ | |
249 | static inline struct page * | |
250 | __page_find_buddy(struct page *page, unsigned long page_idx, unsigned int order) | |
251 | { | |
252 | unsigned long buddy_idx = page_idx ^ (1 << order); | |
253 | ||
254 | return page + (buddy_idx - page_idx); | |
255 | } | |
256 | ||
257 | static inline unsigned long | |
258 | __find_combined_index(unsigned long page_idx, unsigned int order) | |
259 | { | |
260 | return (page_idx & ~(1 << order)); | |
261 | } | |
262 | ||
263 | /* | |
264 | * This function checks whether a page is free && is the buddy | |
265 | * we can do coalesce a page and its buddy if | |
13e7444b NP |
266 | * (a) the buddy is not in a hole && |
267 | * (b) the buddy is free && | |
268 | * (c) the buddy is on the buddy system && | |
269 | * (d) a page and its buddy have the same order. | |
4c21e2f2 | 270 | * for recording page's order, we use page_private(page) and PG_private. |
1da177e4 LT |
271 | * |
272 | */ | |
273 | static inline int page_is_buddy(struct page *page, int order) | |
274 | { | |
13e7444b NP |
275 | #ifdef CONFIG_HOLES_IN_ZONE |
276 | if (!pfn_valid(page_to_pfn(page))) | |
277 | return 0; | |
278 | #endif | |
279 | ||
1da177e4 LT |
280 | if (PagePrivate(page) && |
281 | (page_order(page) == order) && | |
1da177e4 LT |
282 | page_count(page) == 0) |
283 | return 1; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Freeing function for a buddy system allocator. | |
289 | * | |
290 | * The concept of a buddy system is to maintain direct-mapped table | |
291 | * (containing bit values) for memory blocks of various "orders". | |
292 | * The bottom level table contains the map for the smallest allocatable | |
293 | * units of memory (here, pages), and each level above it describes | |
294 | * pairs of units from the levels below, hence, "buddies". | |
295 | * At a high level, all that happens here is marking the table entry | |
296 | * at the bottom level available, and propagating the changes upward | |
297 | * as necessary, plus some accounting needed to play nicely with other | |
298 | * parts of the VM system. | |
299 | * At each level, we keep a list of pages, which are heads of continuous | |
300 | * free pages of length of (1 << order) and marked with PG_Private.Page's | |
4c21e2f2 | 301 | * order is recorded in page_private(page) field. |
1da177e4 LT |
302 | * So when we are allocating or freeing one, we can derive the state of the |
303 | * other. That is, if we allocate a small block, and both were | |
304 | * free, the remainder of the region must be split into blocks. | |
305 | * If a block is freed, and its buddy is also free, then this | |
306 | * triggers coalescing into a block of larger size. | |
307 | * | |
308 | * -- wli | |
309 | */ | |
310 | ||
48db57f8 | 311 | static inline void __free_one_page(struct page *page, |
1da177e4 LT |
312 | struct zone *zone, unsigned int order) |
313 | { | |
314 | unsigned long page_idx; | |
315 | int order_size = 1 << order; | |
316 | ||
224abf92 | 317 | if (unlikely(PageCompound(page))) |
1da177e4 LT |
318 | destroy_compound_page(page, order); |
319 | ||
320 | page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1); | |
321 | ||
322 | BUG_ON(page_idx & (order_size - 1)); | |
323 | BUG_ON(bad_range(zone, page)); | |
324 | ||
325 | zone->free_pages += order_size; | |
326 | while (order < MAX_ORDER-1) { | |
327 | unsigned long combined_idx; | |
328 | struct free_area *area; | |
329 | struct page *buddy; | |
330 | ||
1da177e4 | 331 | buddy = __page_find_buddy(page, page_idx, order); |
1da177e4 LT |
332 | if (!page_is_buddy(buddy, order)) |
333 | break; /* Move the buddy up one level. */ | |
13e7444b | 334 | |
1da177e4 LT |
335 | list_del(&buddy->lru); |
336 | area = zone->free_area + order; | |
337 | area->nr_free--; | |
338 | rmv_page_order(buddy); | |
13e7444b | 339 | combined_idx = __find_combined_index(page_idx, order); |
1da177e4 LT |
340 | page = page + (combined_idx - page_idx); |
341 | page_idx = combined_idx; | |
342 | order++; | |
343 | } | |
344 | set_page_order(page, order); | |
345 | list_add(&page->lru, &zone->free_area[order].free_list); | |
346 | zone->free_area[order].nr_free++; | |
347 | } | |
348 | ||
224abf92 | 349 | static inline int free_pages_check(struct page *page) |
1da177e4 | 350 | { |
92be2e33 NP |
351 | if (unlikely(page_mapcount(page) | |
352 | (page->mapping != NULL) | | |
353 | (page_count(page) != 0) | | |
1da177e4 LT |
354 | (page->flags & ( |
355 | 1 << PG_lru | | |
356 | 1 << PG_private | | |
357 | 1 << PG_locked | | |
358 | 1 << PG_active | | |
359 | 1 << PG_reclaim | | |
360 | 1 << PG_slab | | |
361 | 1 << PG_swapcache | | |
b5810039 | 362 | 1 << PG_writeback | |
92be2e33 | 363 | 1 << PG_reserved )))) |
224abf92 | 364 | bad_page(page); |
1da177e4 | 365 | if (PageDirty(page)) |
242e5468 | 366 | __ClearPageDirty(page); |
689bcebf HD |
367 | /* |
368 | * For now, we report if PG_reserved was found set, but do not | |
369 | * clear it, and do not free the page. But we shall soon need | |
370 | * to do more, for when the ZERO_PAGE count wraps negative. | |
371 | */ | |
372 | return PageReserved(page); | |
1da177e4 LT |
373 | } |
374 | ||
375 | /* | |
376 | * Frees a list of pages. | |
377 | * Assumes all pages on list are in same zone, and of same order. | |
207f36ee | 378 | * count is the number of pages to free. |
1da177e4 LT |
379 | * |
380 | * If the zone was previously in an "all pages pinned" state then look to | |
381 | * see if this freeing clears that state. | |
382 | * | |
383 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
384 | * pinned" detection logic. | |
385 | */ | |
48db57f8 NP |
386 | static void free_pages_bulk(struct zone *zone, int count, |
387 | struct list_head *list, int order) | |
1da177e4 | 388 | { |
c54ad30c | 389 | spin_lock(&zone->lock); |
1da177e4 LT |
390 | zone->all_unreclaimable = 0; |
391 | zone->pages_scanned = 0; | |
48db57f8 NP |
392 | while (count--) { |
393 | struct page *page; | |
394 | ||
395 | BUG_ON(list_empty(list)); | |
1da177e4 | 396 | page = list_entry(list->prev, struct page, lru); |
48db57f8 | 397 | /* have to delete it as __free_one_page list manipulates */ |
1da177e4 | 398 | list_del(&page->lru); |
48db57f8 | 399 | __free_one_page(page, zone, order); |
1da177e4 | 400 | } |
c54ad30c | 401 | spin_unlock(&zone->lock); |
1da177e4 LT |
402 | } |
403 | ||
48db57f8 | 404 | static void free_one_page(struct zone *zone, struct page *page, int order) |
1da177e4 LT |
405 | { |
406 | LIST_HEAD(list); | |
48db57f8 NP |
407 | list_add(&page->lru, &list); |
408 | free_pages_bulk(zone, 1, &list, order); | |
409 | } | |
410 | ||
411 | static void __free_pages_ok(struct page *page, unsigned int order) | |
412 | { | |
413 | unsigned long flags; | |
1da177e4 | 414 | int i; |
689bcebf | 415 | int reserved = 0; |
1da177e4 LT |
416 | |
417 | arch_free_page(page, order); | |
de5097c2 IM |
418 | if (!PageHighMem(page)) |
419 | mutex_debug_check_no_locks_freed(page_address(page), | |
a4fc7ab1 | 420 | PAGE_SIZE<<order); |
1da177e4 | 421 | |
1da177e4 | 422 | #ifndef CONFIG_MMU |
48db57f8 NP |
423 | for (i = 1 ; i < (1 << order) ; ++i) |
424 | __put_page(page + i); | |
1da177e4 LT |
425 | #endif |
426 | ||
427 | for (i = 0 ; i < (1 << order) ; ++i) | |
224abf92 | 428 | reserved += free_pages_check(page + i); |
689bcebf HD |
429 | if (reserved) |
430 | return; | |
431 | ||
48db57f8 | 432 | kernel_map_pages(page, 1 << order, 0); |
c54ad30c | 433 | local_irq_save(flags); |
a74609fa | 434 | __mod_page_state(pgfree, 1 << order); |
48db57f8 | 435 | free_one_page(page_zone(page), page, order); |
c54ad30c | 436 | local_irq_restore(flags); |
1da177e4 LT |
437 | } |
438 | ||
a226f6c8 DH |
439 | /* |
440 | * permit the bootmem allocator to evade page validation on high-order frees | |
441 | */ | |
442 | void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order) | |
443 | { | |
444 | if (order == 0) { | |
445 | __ClearPageReserved(page); | |
446 | set_page_count(page, 0); | |
447 | ||
448 | free_hot_cold_page(page, 0); | |
449 | } else { | |
450 | LIST_HEAD(list); | |
451 | int loop; | |
452 | ||
453 | for (loop = 0; loop < BITS_PER_LONG; loop++) { | |
454 | struct page *p = &page[loop]; | |
455 | ||
456 | if (loop + 16 < BITS_PER_LONG) | |
457 | prefetchw(p + 16); | |
458 | __ClearPageReserved(p); | |
459 | set_page_count(p, 0); | |
460 | } | |
461 | ||
462 | arch_free_page(page, order); | |
463 | ||
464 | mod_page_state(pgfree, 1 << order); | |
465 | ||
466 | list_add(&page->lru, &list); | |
467 | kernel_map_pages(page, 1 << order, 0); | |
468 | free_pages_bulk(page_zone(page), 1, &list, order); | |
469 | } | |
470 | } | |
471 | ||
1da177e4 LT |
472 | |
473 | /* | |
474 | * The order of subdivision here is critical for the IO subsystem. | |
475 | * Please do not alter this order without good reasons and regression | |
476 | * testing. Specifically, as large blocks of memory are subdivided, | |
477 | * the order in which smaller blocks are delivered depends on the order | |
478 | * they're subdivided in this function. This is the primary factor | |
479 | * influencing the order in which pages are delivered to the IO | |
480 | * subsystem according to empirical testing, and this is also justified | |
481 | * by considering the behavior of a buddy system containing a single | |
482 | * large block of memory acted on by a series of small allocations. | |
483 | * This behavior is a critical factor in sglist merging's success. | |
484 | * | |
485 | * -- wli | |
486 | */ | |
085cc7d5 | 487 | static inline void expand(struct zone *zone, struct page *page, |
1da177e4 LT |
488 | int low, int high, struct free_area *area) |
489 | { | |
490 | unsigned long size = 1 << high; | |
491 | ||
492 | while (high > low) { | |
493 | area--; | |
494 | high--; | |
495 | size >>= 1; | |
496 | BUG_ON(bad_range(zone, &page[size])); | |
497 | list_add(&page[size].lru, &area->free_list); | |
498 | area->nr_free++; | |
499 | set_page_order(&page[size], high); | |
500 | } | |
1da177e4 LT |
501 | } |
502 | ||
1da177e4 LT |
503 | /* |
504 | * This page is about to be returned from the page allocator | |
505 | */ | |
689bcebf | 506 | static int prep_new_page(struct page *page, int order) |
1da177e4 | 507 | { |
92be2e33 NP |
508 | if (unlikely(page_mapcount(page) | |
509 | (page->mapping != NULL) | | |
510 | (page_count(page) != 0) | | |
334795ec HD |
511 | (page->flags & ( |
512 | 1 << PG_lru | | |
1da177e4 LT |
513 | 1 << PG_private | |
514 | 1 << PG_locked | | |
1da177e4 LT |
515 | 1 << PG_active | |
516 | 1 << PG_dirty | | |
517 | 1 << PG_reclaim | | |
334795ec | 518 | 1 << PG_slab | |
1da177e4 | 519 | 1 << PG_swapcache | |
b5810039 | 520 | 1 << PG_writeback | |
92be2e33 | 521 | 1 << PG_reserved )))) |
224abf92 | 522 | bad_page(page); |
1da177e4 | 523 | |
689bcebf HD |
524 | /* |
525 | * For now, we report if PG_reserved was found set, but do not | |
526 | * clear it, and do not allocate the page: as a safety net. | |
527 | */ | |
528 | if (PageReserved(page)) | |
529 | return 1; | |
530 | ||
1da177e4 LT |
531 | page->flags &= ~(1 << PG_uptodate | 1 << PG_error | |
532 | 1 << PG_referenced | 1 << PG_arch_1 | | |
533 | 1 << PG_checked | 1 << PG_mappedtodisk); | |
4c21e2f2 | 534 | set_page_private(page, 0); |
1da177e4 LT |
535 | set_page_refs(page, order); |
536 | kernel_map_pages(page, 1 << order, 1); | |
689bcebf | 537 | return 0; |
1da177e4 LT |
538 | } |
539 | ||
540 | /* | |
541 | * Do the hard work of removing an element from the buddy allocator. | |
542 | * Call me with the zone->lock already held. | |
543 | */ | |
544 | static struct page *__rmqueue(struct zone *zone, unsigned int order) | |
545 | { | |
546 | struct free_area * area; | |
547 | unsigned int current_order; | |
548 | struct page *page; | |
549 | ||
550 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
551 | area = zone->free_area + current_order; | |
552 | if (list_empty(&area->free_list)) | |
553 | continue; | |
554 | ||
555 | page = list_entry(area->free_list.next, struct page, lru); | |
556 | list_del(&page->lru); | |
557 | rmv_page_order(page); | |
558 | area->nr_free--; | |
559 | zone->free_pages -= 1UL << order; | |
085cc7d5 NP |
560 | expand(zone, page, order, current_order, area); |
561 | return page; | |
1da177e4 LT |
562 | } |
563 | ||
564 | return NULL; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Obtain a specified number of elements from the buddy allocator, all under | |
569 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
570 | * Returns the number of new pages which were placed at *list. | |
571 | */ | |
572 | static int rmqueue_bulk(struct zone *zone, unsigned int order, | |
573 | unsigned long count, struct list_head *list) | |
574 | { | |
1da177e4 | 575 | int i; |
1da177e4 | 576 | |
c54ad30c | 577 | spin_lock(&zone->lock); |
1da177e4 | 578 | for (i = 0; i < count; ++i) { |
085cc7d5 NP |
579 | struct page *page = __rmqueue(zone, order); |
580 | if (unlikely(page == NULL)) | |
1da177e4 | 581 | break; |
1da177e4 LT |
582 | list_add_tail(&page->lru, list); |
583 | } | |
c54ad30c | 584 | spin_unlock(&zone->lock); |
085cc7d5 | 585 | return i; |
1da177e4 LT |
586 | } |
587 | ||
4ae7c039 CL |
588 | #ifdef CONFIG_NUMA |
589 | /* Called from the slab reaper to drain remote pagesets */ | |
590 | void drain_remote_pages(void) | |
591 | { | |
592 | struct zone *zone; | |
593 | int i; | |
594 | unsigned long flags; | |
595 | ||
596 | local_irq_save(flags); | |
597 | for_each_zone(zone) { | |
598 | struct per_cpu_pageset *pset; | |
599 | ||
600 | /* Do not drain local pagesets */ | |
601 | if (zone->zone_pgdat->node_id == numa_node_id()) | |
602 | continue; | |
603 | ||
23316bc8 | 604 | pset = zone_pcp(zone, smp_processor_id()); |
4ae7c039 CL |
605 | for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
606 | struct per_cpu_pages *pcp; | |
607 | ||
608 | pcp = &pset->pcp[i]; | |
48db57f8 NP |
609 | free_pages_bulk(zone, pcp->count, &pcp->list, 0); |
610 | pcp->count = 0; | |
4ae7c039 CL |
611 | } |
612 | } | |
613 | local_irq_restore(flags); | |
614 | } | |
615 | #endif | |
616 | ||
1da177e4 LT |
617 | #if defined(CONFIG_PM) || defined(CONFIG_HOTPLUG_CPU) |
618 | static void __drain_pages(unsigned int cpu) | |
619 | { | |
c54ad30c | 620 | unsigned long flags; |
1da177e4 LT |
621 | struct zone *zone; |
622 | int i; | |
623 | ||
624 | for_each_zone(zone) { | |
625 | struct per_cpu_pageset *pset; | |
626 | ||
e7c8d5c9 | 627 | pset = zone_pcp(zone, cpu); |
1da177e4 LT |
628 | for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
629 | struct per_cpu_pages *pcp; | |
630 | ||
631 | pcp = &pset->pcp[i]; | |
c54ad30c | 632 | local_irq_save(flags); |
48db57f8 NP |
633 | free_pages_bulk(zone, pcp->count, &pcp->list, 0); |
634 | pcp->count = 0; | |
c54ad30c | 635 | local_irq_restore(flags); |
1da177e4 LT |
636 | } |
637 | } | |
638 | } | |
639 | #endif /* CONFIG_PM || CONFIG_HOTPLUG_CPU */ | |
640 | ||
641 | #ifdef CONFIG_PM | |
642 | ||
643 | void mark_free_pages(struct zone *zone) | |
644 | { | |
645 | unsigned long zone_pfn, flags; | |
646 | int order; | |
647 | struct list_head *curr; | |
648 | ||
649 | if (!zone->spanned_pages) | |
650 | return; | |
651 | ||
652 | spin_lock_irqsave(&zone->lock, flags); | |
653 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) | |
654 | ClearPageNosaveFree(pfn_to_page(zone_pfn + zone->zone_start_pfn)); | |
655 | ||
656 | for (order = MAX_ORDER - 1; order >= 0; --order) | |
657 | list_for_each(curr, &zone->free_area[order].free_list) { | |
658 | unsigned long start_pfn, i; | |
659 | ||
660 | start_pfn = page_to_pfn(list_entry(curr, struct page, lru)); | |
661 | ||
662 | for (i=0; i < (1<<order); i++) | |
663 | SetPageNosaveFree(pfn_to_page(start_pfn+i)); | |
664 | } | |
665 | spin_unlock_irqrestore(&zone->lock, flags); | |
666 | } | |
667 | ||
668 | /* | |
669 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
670 | */ | |
671 | void drain_local_pages(void) | |
672 | { | |
673 | unsigned long flags; | |
674 | ||
675 | local_irq_save(flags); | |
676 | __drain_pages(smp_processor_id()); | |
677 | local_irq_restore(flags); | |
678 | } | |
679 | #endif /* CONFIG_PM */ | |
680 | ||
a74609fa | 681 | static void zone_statistics(struct zonelist *zonelist, struct zone *z, int cpu) |
1da177e4 LT |
682 | { |
683 | #ifdef CONFIG_NUMA | |
1da177e4 LT |
684 | pg_data_t *pg = z->zone_pgdat; |
685 | pg_data_t *orig = zonelist->zones[0]->zone_pgdat; | |
686 | struct per_cpu_pageset *p; | |
687 | ||
a74609fa | 688 | p = zone_pcp(z, cpu); |
1da177e4 | 689 | if (pg == orig) { |
e7c8d5c9 | 690 | p->numa_hit++; |
1da177e4 LT |
691 | } else { |
692 | p->numa_miss++; | |
e7c8d5c9 | 693 | zone_pcp(zonelist->zones[0], cpu)->numa_foreign++; |
1da177e4 LT |
694 | } |
695 | if (pg == NODE_DATA(numa_node_id())) | |
696 | p->local_node++; | |
697 | else | |
698 | p->other_node++; | |
1da177e4 LT |
699 | #endif |
700 | } | |
701 | ||
702 | /* | |
703 | * Free a 0-order page | |
704 | */ | |
1da177e4 LT |
705 | static void fastcall free_hot_cold_page(struct page *page, int cold) |
706 | { | |
707 | struct zone *zone = page_zone(page); | |
708 | struct per_cpu_pages *pcp; | |
709 | unsigned long flags; | |
710 | ||
711 | arch_free_page(page, 0); | |
712 | ||
1da177e4 LT |
713 | if (PageAnon(page)) |
714 | page->mapping = NULL; | |
224abf92 | 715 | if (free_pages_check(page)) |
689bcebf HD |
716 | return; |
717 | ||
689bcebf HD |
718 | kernel_map_pages(page, 1, 0); |
719 | ||
e7c8d5c9 | 720 | pcp = &zone_pcp(zone, get_cpu())->pcp[cold]; |
1da177e4 | 721 | local_irq_save(flags); |
a74609fa | 722 | __inc_page_state(pgfree); |
1da177e4 LT |
723 | list_add(&page->lru, &pcp->list); |
724 | pcp->count++; | |
48db57f8 NP |
725 | if (pcp->count >= pcp->high) { |
726 | free_pages_bulk(zone, pcp->batch, &pcp->list, 0); | |
727 | pcp->count -= pcp->batch; | |
728 | } | |
1da177e4 LT |
729 | local_irq_restore(flags); |
730 | put_cpu(); | |
731 | } | |
732 | ||
733 | void fastcall free_hot_page(struct page *page) | |
734 | { | |
735 | free_hot_cold_page(page, 0); | |
736 | } | |
737 | ||
738 | void fastcall free_cold_page(struct page *page) | |
739 | { | |
740 | free_hot_cold_page(page, 1); | |
741 | } | |
742 | ||
dd0fc66f | 743 | static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) |
1da177e4 LT |
744 | { |
745 | int i; | |
746 | ||
747 | BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM); | |
748 | for(i = 0; i < (1 << order); i++) | |
749 | clear_highpage(page + i); | |
750 | } | |
751 | ||
752 | /* | |
753 | * Really, prep_compound_page() should be called from __rmqueue_bulk(). But | |
754 | * we cheat by calling it from here, in the order > 0 path. Saves a branch | |
755 | * or two. | |
756 | */ | |
a74609fa NP |
757 | static struct page *buffered_rmqueue(struct zonelist *zonelist, |
758 | struct zone *zone, int order, gfp_t gfp_flags) | |
1da177e4 LT |
759 | { |
760 | unsigned long flags; | |
689bcebf | 761 | struct page *page; |
1da177e4 | 762 | int cold = !!(gfp_flags & __GFP_COLD); |
a74609fa | 763 | int cpu; |
1da177e4 | 764 | |
689bcebf | 765 | again: |
a74609fa | 766 | cpu = get_cpu(); |
48db57f8 | 767 | if (likely(order == 0)) { |
1da177e4 LT |
768 | struct per_cpu_pages *pcp; |
769 | ||
a74609fa | 770 | pcp = &zone_pcp(zone, cpu)->pcp[cold]; |
1da177e4 | 771 | local_irq_save(flags); |
a74609fa | 772 | if (!pcp->count) { |
1da177e4 LT |
773 | pcp->count += rmqueue_bulk(zone, 0, |
774 | pcp->batch, &pcp->list); | |
a74609fa NP |
775 | if (unlikely(!pcp->count)) |
776 | goto failed; | |
1da177e4 | 777 | } |
a74609fa NP |
778 | page = list_entry(pcp->list.next, struct page, lru); |
779 | list_del(&page->lru); | |
780 | pcp->count--; | |
7fb1d9fc | 781 | } else { |
1da177e4 LT |
782 | spin_lock_irqsave(&zone->lock, flags); |
783 | page = __rmqueue(zone, order); | |
a74609fa NP |
784 | spin_unlock(&zone->lock); |
785 | if (!page) | |
786 | goto failed; | |
1da177e4 LT |
787 | } |
788 | ||
a74609fa NP |
789 | __mod_page_state_zone(zone, pgalloc, 1 << order); |
790 | zone_statistics(zonelist, zone, cpu); | |
791 | local_irq_restore(flags); | |
792 | put_cpu(); | |
1da177e4 | 793 | |
a74609fa NP |
794 | BUG_ON(bad_range(zone, page)); |
795 | if (prep_new_page(page, order)) | |
796 | goto again; | |
1da177e4 | 797 | |
a74609fa NP |
798 | if (gfp_flags & __GFP_ZERO) |
799 | prep_zero_page(page, order, gfp_flags); | |
800 | ||
801 | if (order && (gfp_flags & __GFP_COMP)) | |
802 | prep_compound_page(page, order); | |
1da177e4 | 803 | return page; |
a74609fa NP |
804 | |
805 | failed: | |
806 | local_irq_restore(flags); | |
807 | put_cpu(); | |
808 | return NULL; | |
1da177e4 LT |
809 | } |
810 | ||
7fb1d9fc | 811 | #define ALLOC_NO_WATERMARKS 0x01 /* don't check watermarks at all */ |
3148890b NP |
812 | #define ALLOC_WMARK_MIN 0x02 /* use pages_min watermark */ |
813 | #define ALLOC_WMARK_LOW 0x04 /* use pages_low watermark */ | |
814 | #define ALLOC_WMARK_HIGH 0x08 /* use pages_high watermark */ | |
815 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
816 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
817 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
7fb1d9fc | 818 | |
1da177e4 LT |
819 | /* |
820 | * Return 1 if free pages are above 'mark'. This takes into account the order | |
821 | * of the allocation. | |
822 | */ | |
823 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 824 | int classzone_idx, int alloc_flags) |
1da177e4 LT |
825 | { |
826 | /* free_pages my go negative - that's OK */ | |
827 | long min = mark, free_pages = z->free_pages - (1 << order) + 1; | |
828 | int o; | |
829 | ||
7fb1d9fc | 830 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 831 | min -= min / 2; |
7fb1d9fc | 832 | if (alloc_flags & ALLOC_HARDER) |
1da177e4 LT |
833 | min -= min / 4; |
834 | ||
835 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
836 | return 0; | |
837 | for (o = 0; o < order; o++) { | |
838 | /* At the next order, this order's pages become unavailable */ | |
839 | free_pages -= z->free_area[o].nr_free << o; | |
840 | ||
841 | /* Require fewer higher order pages to be free */ | |
842 | min >>= 1; | |
843 | ||
844 | if (free_pages <= min) | |
845 | return 0; | |
846 | } | |
847 | return 1; | |
848 | } | |
849 | ||
7fb1d9fc RS |
850 | /* |
851 | * get_page_from_freeliest goes through the zonelist trying to allocate | |
852 | * a page. | |
853 | */ | |
854 | static struct page * | |
855 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, | |
856 | struct zonelist *zonelist, int alloc_flags) | |
753ee728 | 857 | { |
7fb1d9fc RS |
858 | struct zone **z = zonelist->zones; |
859 | struct page *page = NULL; | |
860 | int classzone_idx = zone_idx(*z); | |
861 | ||
862 | /* | |
863 | * Go through the zonelist once, looking for a zone with enough free. | |
864 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. | |
865 | */ | |
866 | do { | |
867 | if ((alloc_flags & ALLOC_CPUSET) && | |
868 | !cpuset_zone_allowed(*z, gfp_mask)) | |
869 | continue; | |
870 | ||
871 | if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { | |
3148890b NP |
872 | unsigned long mark; |
873 | if (alloc_flags & ALLOC_WMARK_MIN) | |
874 | mark = (*z)->pages_min; | |
875 | else if (alloc_flags & ALLOC_WMARK_LOW) | |
876 | mark = (*z)->pages_low; | |
877 | else | |
878 | mark = (*z)->pages_high; | |
879 | if (!zone_watermark_ok(*z, order, mark, | |
7fb1d9fc RS |
880 | classzone_idx, alloc_flags)) |
881 | continue; | |
882 | } | |
883 | ||
a74609fa | 884 | page = buffered_rmqueue(zonelist, *z, order, gfp_mask); |
7fb1d9fc | 885 | if (page) { |
7fb1d9fc RS |
886 | break; |
887 | } | |
888 | } while (*(++z) != NULL); | |
889 | return page; | |
753ee728 MH |
890 | } |
891 | ||
1da177e4 LT |
892 | /* |
893 | * This is the 'heart' of the zoned buddy allocator. | |
894 | */ | |
895 | struct page * fastcall | |
dd0fc66f | 896 | __alloc_pages(gfp_t gfp_mask, unsigned int order, |
1da177e4 LT |
897 | struct zonelist *zonelist) |
898 | { | |
260b2367 | 899 | const gfp_t wait = gfp_mask & __GFP_WAIT; |
7fb1d9fc | 900 | struct zone **z; |
1da177e4 LT |
901 | struct page *page; |
902 | struct reclaim_state reclaim_state; | |
903 | struct task_struct *p = current; | |
1da177e4 | 904 | int do_retry; |
7fb1d9fc | 905 | int alloc_flags; |
1da177e4 LT |
906 | int did_some_progress; |
907 | ||
908 | might_sleep_if(wait); | |
909 | ||
6b1de916 | 910 | restart: |
7fb1d9fc | 911 | z = zonelist->zones; /* the list of zones suitable for gfp_mask */ |
1da177e4 | 912 | |
7fb1d9fc | 913 | if (unlikely(*z == NULL)) { |
1da177e4 LT |
914 | /* Should this ever happen?? */ |
915 | return NULL; | |
916 | } | |
6b1de916 | 917 | |
7fb1d9fc | 918 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 919 | zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET); |
7fb1d9fc RS |
920 | if (page) |
921 | goto got_pg; | |
1da177e4 | 922 | |
6b1de916 | 923 | do { |
7fb1d9fc | 924 | wakeup_kswapd(*z, order); |
6b1de916 | 925 | } while (*(++z)); |
1da177e4 | 926 | |
9bf2229f | 927 | /* |
7fb1d9fc RS |
928 | * OK, we're below the kswapd watermark and have kicked background |
929 | * reclaim. Now things get more complex, so set up alloc_flags according | |
930 | * to how we want to proceed. | |
931 | * | |
932 | * The caller may dip into page reserves a bit more if the caller | |
933 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
4eac915d PJ |
934 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will |
935 | * set both ALLOC_HARDER (!wait) and ALLOC_HIGH (__GFP_HIGH). | |
9bf2229f | 936 | */ |
3148890b | 937 | alloc_flags = ALLOC_WMARK_MIN; |
7fb1d9fc RS |
938 | if ((unlikely(rt_task(p)) && !in_interrupt()) || !wait) |
939 | alloc_flags |= ALLOC_HARDER; | |
940 | if (gfp_mask & __GFP_HIGH) | |
941 | alloc_flags |= ALLOC_HIGH; | |
47f3a867 | 942 | alloc_flags |= ALLOC_CPUSET; |
1da177e4 LT |
943 | |
944 | /* | |
945 | * Go through the zonelist again. Let __GFP_HIGH and allocations | |
7fb1d9fc | 946 | * coming from realtime tasks go deeper into reserves. |
1da177e4 LT |
947 | * |
948 | * This is the last chance, in general, before the goto nopage. | |
949 | * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc. | |
9bf2229f | 950 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1da177e4 | 951 | */ |
7fb1d9fc RS |
952 | page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags); |
953 | if (page) | |
954 | goto got_pg; | |
1da177e4 LT |
955 | |
956 | /* This allocation should allow future memory freeing. */ | |
b84a35be NP |
957 | |
958 | if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) | |
959 | && !in_interrupt()) { | |
960 | if (!(gfp_mask & __GFP_NOMEMALLOC)) { | |
885036d3 | 961 | nofail_alloc: |
b84a35be | 962 | /* go through the zonelist yet again, ignoring mins */ |
7fb1d9fc | 963 | page = get_page_from_freelist(gfp_mask, order, |
47f3a867 | 964 | zonelist, ALLOC_NO_WATERMARKS); |
7fb1d9fc RS |
965 | if (page) |
966 | goto got_pg; | |
885036d3 KK |
967 | if (gfp_mask & __GFP_NOFAIL) { |
968 | blk_congestion_wait(WRITE, HZ/50); | |
969 | goto nofail_alloc; | |
970 | } | |
1da177e4 LT |
971 | } |
972 | goto nopage; | |
973 | } | |
974 | ||
975 | /* Atomic allocations - we can't balance anything */ | |
976 | if (!wait) | |
977 | goto nopage; | |
978 | ||
979 | rebalance: | |
980 | cond_resched(); | |
981 | ||
982 | /* We now go into synchronous reclaim */ | |
3e0d98b9 | 983 | cpuset_memory_pressure_bump(); |
1da177e4 LT |
984 | p->flags |= PF_MEMALLOC; |
985 | reclaim_state.reclaimed_slab = 0; | |
986 | p->reclaim_state = &reclaim_state; | |
987 | ||
7fb1d9fc | 988 | did_some_progress = try_to_free_pages(zonelist->zones, gfp_mask); |
1da177e4 LT |
989 | |
990 | p->reclaim_state = NULL; | |
991 | p->flags &= ~PF_MEMALLOC; | |
992 | ||
993 | cond_resched(); | |
994 | ||
995 | if (likely(did_some_progress)) { | |
7fb1d9fc RS |
996 | page = get_page_from_freelist(gfp_mask, order, |
997 | zonelist, alloc_flags); | |
998 | if (page) | |
999 | goto got_pg; | |
1da177e4 LT |
1000 | } else if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) { |
1001 | /* | |
1002 | * Go through the zonelist yet one more time, keep | |
1003 | * very high watermark here, this is only to catch | |
1004 | * a parallel oom killing, we must fail if we're still | |
1005 | * under heavy pressure. | |
1006 | */ | |
7fb1d9fc | 1007 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 1008 | zonelist, ALLOC_WMARK_HIGH|ALLOC_CPUSET); |
7fb1d9fc RS |
1009 | if (page) |
1010 | goto got_pg; | |
1da177e4 | 1011 | |
79b9ce31 | 1012 | out_of_memory(gfp_mask, order); |
1da177e4 LT |
1013 | goto restart; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Don't let big-order allocations loop unless the caller explicitly | |
1018 | * requests that. Wait for some write requests to complete then retry. | |
1019 | * | |
1020 | * In this implementation, __GFP_REPEAT means __GFP_NOFAIL for order | |
1021 | * <= 3, but that may not be true in other implementations. | |
1022 | */ | |
1023 | do_retry = 0; | |
1024 | if (!(gfp_mask & __GFP_NORETRY)) { | |
1025 | if ((order <= 3) || (gfp_mask & __GFP_REPEAT)) | |
1026 | do_retry = 1; | |
1027 | if (gfp_mask & __GFP_NOFAIL) | |
1028 | do_retry = 1; | |
1029 | } | |
1030 | if (do_retry) { | |
1031 | blk_congestion_wait(WRITE, HZ/50); | |
1032 | goto rebalance; | |
1033 | } | |
1034 | ||
1035 | nopage: | |
1036 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) { | |
1037 | printk(KERN_WARNING "%s: page allocation failure." | |
1038 | " order:%d, mode:0x%x\n", | |
1039 | p->comm, order, gfp_mask); | |
1040 | dump_stack(); | |
578c2fd6 | 1041 | show_mem(); |
1da177e4 | 1042 | } |
1da177e4 | 1043 | got_pg: |
1da177e4 LT |
1044 | return page; |
1045 | } | |
1046 | ||
1047 | EXPORT_SYMBOL(__alloc_pages); | |
1048 | ||
1049 | /* | |
1050 | * Common helper functions. | |
1051 | */ | |
dd0fc66f | 1052 | fastcall unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
1053 | { |
1054 | struct page * page; | |
1055 | page = alloc_pages(gfp_mask, order); | |
1056 | if (!page) | |
1057 | return 0; | |
1058 | return (unsigned long) page_address(page); | |
1059 | } | |
1060 | ||
1061 | EXPORT_SYMBOL(__get_free_pages); | |
1062 | ||
dd0fc66f | 1063 | fastcall unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 LT |
1064 | { |
1065 | struct page * page; | |
1066 | ||
1067 | /* | |
1068 | * get_zeroed_page() returns a 32-bit address, which cannot represent | |
1069 | * a highmem page | |
1070 | */ | |
260b2367 | 1071 | BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); |
1da177e4 LT |
1072 | |
1073 | page = alloc_pages(gfp_mask | __GFP_ZERO, 0); | |
1074 | if (page) | |
1075 | return (unsigned long) page_address(page); | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | EXPORT_SYMBOL(get_zeroed_page); | |
1080 | ||
1081 | void __pagevec_free(struct pagevec *pvec) | |
1082 | { | |
1083 | int i = pagevec_count(pvec); | |
1084 | ||
1085 | while (--i >= 0) | |
1086 | free_hot_cold_page(pvec->pages[i], pvec->cold); | |
1087 | } | |
1088 | ||
1089 | fastcall void __free_pages(struct page *page, unsigned int order) | |
1090 | { | |
b5810039 | 1091 | if (put_page_testzero(page)) { |
1da177e4 LT |
1092 | if (order == 0) |
1093 | free_hot_page(page); | |
1094 | else | |
1095 | __free_pages_ok(page, order); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | EXPORT_SYMBOL(__free_pages); | |
1100 | ||
1101 | fastcall void free_pages(unsigned long addr, unsigned int order) | |
1102 | { | |
1103 | if (addr != 0) { | |
1104 | BUG_ON(!virt_addr_valid((void *)addr)); | |
1105 | __free_pages(virt_to_page((void *)addr), order); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | EXPORT_SYMBOL(free_pages); | |
1110 | ||
1111 | /* | |
1112 | * Total amount of free (allocatable) RAM: | |
1113 | */ | |
1114 | unsigned int nr_free_pages(void) | |
1115 | { | |
1116 | unsigned int sum = 0; | |
1117 | struct zone *zone; | |
1118 | ||
1119 | for_each_zone(zone) | |
1120 | sum += zone->free_pages; | |
1121 | ||
1122 | return sum; | |
1123 | } | |
1124 | ||
1125 | EXPORT_SYMBOL(nr_free_pages); | |
1126 | ||
1127 | #ifdef CONFIG_NUMA | |
1128 | unsigned int nr_free_pages_pgdat(pg_data_t *pgdat) | |
1129 | { | |
1130 | unsigned int i, sum = 0; | |
1131 | ||
1132 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1133 | sum += pgdat->node_zones[i].free_pages; | |
1134 | ||
1135 | return sum; | |
1136 | } | |
1137 | #endif | |
1138 | ||
1139 | static unsigned int nr_free_zone_pages(int offset) | |
1140 | { | |
e310fd43 MB |
1141 | /* Just pick one node, since fallback list is circular */ |
1142 | pg_data_t *pgdat = NODE_DATA(numa_node_id()); | |
1da177e4 LT |
1143 | unsigned int sum = 0; |
1144 | ||
e310fd43 MB |
1145 | struct zonelist *zonelist = pgdat->node_zonelists + offset; |
1146 | struct zone **zonep = zonelist->zones; | |
1147 | struct zone *zone; | |
1da177e4 | 1148 | |
e310fd43 MB |
1149 | for (zone = *zonep++; zone; zone = *zonep++) { |
1150 | unsigned long size = zone->present_pages; | |
1151 | unsigned long high = zone->pages_high; | |
1152 | if (size > high) | |
1153 | sum += size - high; | |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | return sum; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL | |
1161 | */ | |
1162 | unsigned int nr_free_buffer_pages(void) | |
1163 | { | |
af4ca457 | 1164 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | /* | |
1168 | * Amount of free RAM allocatable within all zones | |
1169 | */ | |
1170 | unsigned int nr_free_pagecache_pages(void) | |
1171 | { | |
af4ca457 | 1172 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER)); |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | #ifdef CONFIG_HIGHMEM | |
1176 | unsigned int nr_free_highpages (void) | |
1177 | { | |
1178 | pg_data_t *pgdat; | |
1179 | unsigned int pages = 0; | |
1180 | ||
1181 | for_each_pgdat(pgdat) | |
1182 | pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages; | |
1183 | ||
1184 | return pages; | |
1185 | } | |
1186 | #endif | |
1187 | ||
1188 | #ifdef CONFIG_NUMA | |
1189 | static void show_node(struct zone *zone) | |
1190 | { | |
1191 | printk("Node %d ", zone->zone_pgdat->node_id); | |
1192 | } | |
1193 | #else | |
1194 | #define show_node(zone) do { } while (0) | |
1195 | #endif | |
1196 | ||
1197 | /* | |
1198 | * Accumulate the page_state information across all CPUs. | |
1199 | * The result is unavoidably approximate - it can change | |
1200 | * during and after execution of this function. | |
1201 | */ | |
1202 | static DEFINE_PER_CPU(struct page_state, page_states) = {0}; | |
1203 | ||
1204 | atomic_t nr_pagecache = ATOMIC_INIT(0); | |
1205 | EXPORT_SYMBOL(nr_pagecache); | |
1206 | #ifdef CONFIG_SMP | |
1207 | DEFINE_PER_CPU(long, nr_pagecache_local) = 0; | |
1208 | #endif | |
1209 | ||
a86b1f53 | 1210 | static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask) |
1da177e4 LT |
1211 | { |
1212 | int cpu = 0; | |
1213 | ||
1214 | memset(ret, 0, sizeof(*ret)); | |
84c2008a | 1215 | cpus_and(*cpumask, *cpumask, cpu_online_map); |
1da177e4 | 1216 | |
c07e02db | 1217 | cpu = first_cpu(*cpumask); |
1da177e4 LT |
1218 | while (cpu < NR_CPUS) { |
1219 | unsigned long *in, *out, off; | |
1220 | ||
1221 | in = (unsigned long *)&per_cpu(page_states, cpu); | |
1222 | ||
c07e02db | 1223 | cpu = next_cpu(cpu, *cpumask); |
1da177e4 LT |
1224 | |
1225 | if (cpu < NR_CPUS) | |
1226 | prefetch(&per_cpu(page_states, cpu)); | |
1227 | ||
1228 | out = (unsigned long *)ret; | |
1229 | for (off = 0; off < nr; off++) | |
1230 | *out++ += *in++; | |
1231 | } | |
1232 | } | |
1233 | ||
c07e02db MH |
1234 | void get_page_state_node(struct page_state *ret, int node) |
1235 | { | |
1236 | int nr; | |
1237 | cpumask_t mask = node_to_cpumask(node); | |
1238 | ||
1239 | nr = offsetof(struct page_state, GET_PAGE_STATE_LAST); | |
1240 | nr /= sizeof(unsigned long); | |
1241 | ||
1242 | __get_page_state(ret, nr+1, &mask); | |
1243 | } | |
1244 | ||
1da177e4 LT |
1245 | void get_page_state(struct page_state *ret) |
1246 | { | |
1247 | int nr; | |
c07e02db | 1248 | cpumask_t mask = CPU_MASK_ALL; |
1da177e4 LT |
1249 | |
1250 | nr = offsetof(struct page_state, GET_PAGE_STATE_LAST); | |
1251 | nr /= sizeof(unsigned long); | |
1252 | ||
c07e02db | 1253 | __get_page_state(ret, nr + 1, &mask); |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | void get_full_page_state(struct page_state *ret) | |
1257 | { | |
c07e02db MH |
1258 | cpumask_t mask = CPU_MASK_ALL; |
1259 | ||
1260 | __get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask); | |
1da177e4 LT |
1261 | } |
1262 | ||
a74609fa | 1263 | unsigned long read_page_state_offset(unsigned long offset) |
1da177e4 LT |
1264 | { |
1265 | unsigned long ret = 0; | |
1266 | int cpu; | |
1267 | ||
84c2008a | 1268 | for_each_online_cpu(cpu) { |
1da177e4 LT |
1269 | unsigned long in; |
1270 | ||
1271 | in = (unsigned long)&per_cpu(page_states, cpu) + offset; | |
1272 | ret += *((unsigned long *)in); | |
1273 | } | |
1274 | return ret; | |
1275 | } | |
1276 | ||
a74609fa NP |
1277 | void __mod_page_state_offset(unsigned long offset, unsigned long delta) |
1278 | { | |
1279 | void *ptr; | |
1280 | ||
1281 | ptr = &__get_cpu_var(page_states); | |
1282 | *(unsigned long *)(ptr + offset) += delta; | |
1283 | } | |
1284 | EXPORT_SYMBOL(__mod_page_state_offset); | |
1285 | ||
1286 | void mod_page_state_offset(unsigned long offset, unsigned long delta) | |
1da177e4 LT |
1287 | { |
1288 | unsigned long flags; | |
a74609fa | 1289 | void *ptr; |
1da177e4 LT |
1290 | |
1291 | local_irq_save(flags); | |
1292 | ptr = &__get_cpu_var(page_states); | |
a74609fa | 1293 | *(unsigned long *)(ptr + offset) += delta; |
1da177e4 LT |
1294 | local_irq_restore(flags); |
1295 | } | |
a74609fa | 1296 | EXPORT_SYMBOL(mod_page_state_offset); |
1da177e4 LT |
1297 | |
1298 | void __get_zone_counts(unsigned long *active, unsigned long *inactive, | |
1299 | unsigned long *free, struct pglist_data *pgdat) | |
1300 | { | |
1301 | struct zone *zones = pgdat->node_zones; | |
1302 | int i; | |
1303 | ||
1304 | *active = 0; | |
1305 | *inactive = 0; | |
1306 | *free = 0; | |
1307 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
1308 | *active += zones[i].nr_active; | |
1309 | *inactive += zones[i].nr_inactive; | |
1310 | *free += zones[i].free_pages; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | void get_zone_counts(unsigned long *active, | |
1315 | unsigned long *inactive, unsigned long *free) | |
1316 | { | |
1317 | struct pglist_data *pgdat; | |
1318 | ||
1319 | *active = 0; | |
1320 | *inactive = 0; | |
1321 | *free = 0; | |
1322 | for_each_pgdat(pgdat) { | |
1323 | unsigned long l, m, n; | |
1324 | __get_zone_counts(&l, &m, &n, pgdat); | |
1325 | *active += l; | |
1326 | *inactive += m; | |
1327 | *free += n; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | void si_meminfo(struct sysinfo *val) | |
1332 | { | |
1333 | val->totalram = totalram_pages; | |
1334 | val->sharedram = 0; | |
1335 | val->freeram = nr_free_pages(); | |
1336 | val->bufferram = nr_blockdev_pages(); | |
1337 | #ifdef CONFIG_HIGHMEM | |
1338 | val->totalhigh = totalhigh_pages; | |
1339 | val->freehigh = nr_free_highpages(); | |
1340 | #else | |
1341 | val->totalhigh = 0; | |
1342 | val->freehigh = 0; | |
1343 | #endif | |
1344 | val->mem_unit = PAGE_SIZE; | |
1345 | } | |
1346 | ||
1347 | EXPORT_SYMBOL(si_meminfo); | |
1348 | ||
1349 | #ifdef CONFIG_NUMA | |
1350 | void si_meminfo_node(struct sysinfo *val, int nid) | |
1351 | { | |
1352 | pg_data_t *pgdat = NODE_DATA(nid); | |
1353 | ||
1354 | val->totalram = pgdat->node_present_pages; | |
1355 | val->freeram = nr_free_pages_pgdat(pgdat); | |
1356 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages; | |
1357 | val->freehigh = pgdat->node_zones[ZONE_HIGHMEM].free_pages; | |
1358 | val->mem_unit = PAGE_SIZE; | |
1359 | } | |
1360 | #endif | |
1361 | ||
1362 | #define K(x) ((x) << (PAGE_SHIFT-10)) | |
1363 | ||
1364 | /* | |
1365 | * Show free area list (used inside shift_scroll-lock stuff) | |
1366 | * We also calculate the percentage fragmentation. We do this by counting the | |
1367 | * memory on each free list with the exception of the first item on the list. | |
1368 | */ | |
1369 | void show_free_areas(void) | |
1370 | { | |
1371 | struct page_state ps; | |
1372 | int cpu, temperature; | |
1373 | unsigned long active; | |
1374 | unsigned long inactive; | |
1375 | unsigned long free; | |
1376 | struct zone *zone; | |
1377 | ||
1378 | for_each_zone(zone) { | |
1379 | show_node(zone); | |
1380 | printk("%s per-cpu:", zone->name); | |
1381 | ||
f3fe6512 | 1382 | if (!populated_zone(zone)) { |
1da177e4 LT |
1383 | printk(" empty\n"); |
1384 | continue; | |
1385 | } else | |
1386 | printk("\n"); | |
1387 | ||
6b482c67 | 1388 | for_each_online_cpu(cpu) { |
1da177e4 LT |
1389 | struct per_cpu_pageset *pageset; |
1390 | ||
e7c8d5c9 | 1391 | pageset = zone_pcp(zone, cpu); |
1da177e4 LT |
1392 | |
1393 | for (temperature = 0; temperature < 2; temperature++) | |
2d92c5c9 | 1394 | printk("cpu %d %s: high %d, batch %d used:%d\n", |
1da177e4 LT |
1395 | cpu, |
1396 | temperature ? "cold" : "hot", | |
1da177e4 | 1397 | pageset->pcp[temperature].high, |
4ae7c039 CL |
1398 | pageset->pcp[temperature].batch, |
1399 | pageset->pcp[temperature].count); | |
1da177e4 LT |
1400 | } |
1401 | } | |
1402 | ||
1403 | get_page_state(&ps); | |
1404 | get_zone_counts(&active, &inactive, &free); | |
1405 | ||
c0d62219 | 1406 | printk("Free pages: %11ukB (%ukB HighMem)\n", |
1da177e4 LT |
1407 | K(nr_free_pages()), |
1408 | K(nr_free_highpages())); | |
1409 | ||
1410 | printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu " | |
1411 | "unstable:%lu free:%u slab:%lu mapped:%lu pagetables:%lu\n", | |
1412 | active, | |
1413 | inactive, | |
1414 | ps.nr_dirty, | |
1415 | ps.nr_writeback, | |
1416 | ps.nr_unstable, | |
1417 | nr_free_pages(), | |
1418 | ps.nr_slab, | |
1419 | ps.nr_mapped, | |
1420 | ps.nr_page_table_pages); | |
1421 | ||
1422 | for_each_zone(zone) { | |
1423 | int i; | |
1424 | ||
1425 | show_node(zone); | |
1426 | printk("%s" | |
1427 | " free:%lukB" | |
1428 | " min:%lukB" | |
1429 | " low:%lukB" | |
1430 | " high:%lukB" | |
1431 | " active:%lukB" | |
1432 | " inactive:%lukB" | |
1433 | " present:%lukB" | |
1434 | " pages_scanned:%lu" | |
1435 | " all_unreclaimable? %s" | |
1436 | "\n", | |
1437 | zone->name, | |
1438 | K(zone->free_pages), | |
1439 | K(zone->pages_min), | |
1440 | K(zone->pages_low), | |
1441 | K(zone->pages_high), | |
1442 | K(zone->nr_active), | |
1443 | K(zone->nr_inactive), | |
1444 | K(zone->present_pages), | |
1445 | zone->pages_scanned, | |
1446 | (zone->all_unreclaimable ? "yes" : "no") | |
1447 | ); | |
1448 | printk("lowmem_reserve[]:"); | |
1449 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1450 | printk(" %lu", zone->lowmem_reserve[i]); | |
1451 | printk("\n"); | |
1452 | } | |
1453 | ||
1454 | for_each_zone(zone) { | |
1455 | unsigned long nr, flags, order, total = 0; | |
1456 | ||
1457 | show_node(zone); | |
1458 | printk("%s: ", zone->name); | |
f3fe6512 | 1459 | if (!populated_zone(zone)) { |
1da177e4 LT |
1460 | printk("empty\n"); |
1461 | continue; | |
1462 | } | |
1463 | ||
1464 | spin_lock_irqsave(&zone->lock, flags); | |
1465 | for (order = 0; order < MAX_ORDER; order++) { | |
1466 | nr = zone->free_area[order].nr_free; | |
1467 | total += nr << order; | |
1468 | printk("%lu*%lukB ", nr, K(1UL) << order); | |
1469 | } | |
1470 | spin_unlock_irqrestore(&zone->lock, flags); | |
1471 | printk("= %lukB\n", K(total)); | |
1472 | } | |
1473 | ||
1474 | show_swap_cache_info(); | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Builds allocation fallback zone lists. | |
1a93205b CL |
1479 | * |
1480 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 1481 | */ |
1a93205b | 1482 | static int __init build_zonelists_node(pg_data_t *pgdat, |
070f8032 | 1483 | struct zonelist *zonelist, int nr_zones, int zone_type) |
1da177e4 | 1484 | { |
1a93205b CL |
1485 | struct zone *zone; |
1486 | ||
070f8032 | 1487 | BUG_ON(zone_type > ZONE_HIGHMEM); |
02a68a5e CL |
1488 | |
1489 | do { | |
070f8032 | 1490 | zone = pgdat->node_zones + zone_type; |
1a93205b | 1491 | if (populated_zone(zone)) { |
1da177e4 | 1492 | #ifndef CONFIG_HIGHMEM |
070f8032 | 1493 | BUG_ON(zone_type > ZONE_NORMAL); |
1da177e4 | 1494 | #endif |
070f8032 CL |
1495 | zonelist->zones[nr_zones++] = zone; |
1496 | check_highest_zone(zone_type); | |
1da177e4 | 1497 | } |
070f8032 | 1498 | zone_type--; |
02a68a5e | 1499 | |
070f8032 CL |
1500 | } while (zone_type >= 0); |
1501 | return nr_zones; | |
1da177e4 LT |
1502 | } |
1503 | ||
260b2367 AV |
1504 | static inline int highest_zone(int zone_bits) |
1505 | { | |
1506 | int res = ZONE_NORMAL; | |
1507 | if (zone_bits & (__force int)__GFP_HIGHMEM) | |
1508 | res = ZONE_HIGHMEM; | |
a2f1b424 AK |
1509 | if (zone_bits & (__force int)__GFP_DMA32) |
1510 | res = ZONE_DMA32; | |
260b2367 AV |
1511 | if (zone_bits & (__force int)__GFP_DMA) |
1512 | res = ZONE_DMA; | |
1513 | return res; | |
1514 | } | |
1515 | ||
1da177e4 LT |
1516 | #ifdef CONFIG_NUMA |
1517 | #define MAX_NODE_LOAD (num_online_nodes()) | |
1518 | static int __initdata node_load[MAX_NUMNODES]; | |
1519 | /** | |
4dc3b16b | 1520 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
1521 | * @node: node whose fallback list we're appending |
1522 | * @used_node_mask: nodemask_t of already used nodes | |
1523 | * | |
1524 | * We use a number of factors to determine which is the next node that should | |
1525 | * appear on a given node's fallback list. The node should not have appeared | |
1526 | * already in @node's fallback list, and it should be the next closest node | |
1527 | * according to the distance array (which contains arbitrary distance values | |
1528 | * from each node to each node in the system), and should also prefer nodes | |
1529 | * with no CPUs, since presumably they'll have very little allocation pressure | |
1530 | * on them otherwise. | |
1531 | * It returns -1 if no node is found. | |
1532 | */ | |
1533 | static int __init find_next_best_node(int node, nodemask_t *used_node_mask) | |
1534 | { | |
1535 | int i, n, val; | |
1536 | int min_val = INT_MAX; | |
1537 | int best_node = -1; | |
1538 | ||
1539 | for_each_online_node(i) { | |
1540 | cpumask_t tmp; | |
1541 | ||
1542 | /* Start from local node */ | |
1543 | n = (node+i) % num_online_nodes(); | |
1544 | ||
1545 | /* Don't want a node to appear more than once */ | |
1546 | if (node_isset(n, *used_node_mask)) | |
1547 | continue; | |
1548 | ||
1549 | /* Use the local node if we haven't already */ | |
1550 | if (!node_isset(node, *used_node_mask)) { | |
1551 | best_node = node; | |
1552 | break; | |
1553 | } | |
1554 | ||
1555 | /* Use the distance array to find the distance */ | |
1556 | val = node_distance(node, n); | |
1557 | ||
1558 | /* Give preference to headless and unused nodes */ | |
1559 | tmp = node_to_cpumask(n); | |
1560 | if (!cpus_empty(tmp)) | |
1561 | val += PENALTY_FOR_NODE_WITH_CPUS; | |
1562 | ||
1563 | /* Slight preference for less loaded node */ | |
1564 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
1565 | val += node_load[n]; | |
1566 | ||
1567 | if (val < min_val) { | |
1568 | min_val = val; | |
1569 | best_node = n; | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | if (best_node >= 0) | |
1574 | node_set(best_node, *used_node_mask); | |
1575 | ||
1576 | return best_node; | |
1577 | } | |
1578 | ||
1579 | static void __init build_zonelists(pg_data_t *pgdat) | |
1580 | { | |
1581 | int i, j, k, node, local_node; | |
1582 | int prev_node, load; | |
1583 | struct zonelist *zonelist; | |
1584 | nodemask_t used_mask; | |
1585 | ||
1586 | /* initialize zonelists */ | |
1587 | for (i = 0; i < GFP_ZONETYPES; i++) { | |
1588 | zonelist = pgdat->node_zonelists + i; | |
1589 | zonelist->zones[0] = NULL; | |
1590 | } | |
1591 | ||
1592 | /* NUMA-aware ordering of nodes */ | |
1593 | local_node = pgdat->node_id; | |
1594 | load = num_online_nodes(); | |
1595 | prev_node = local_node; | |
1596 | nodes_clear(used_mask); | |
1597 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { | |
1598 | /* | |
1599 | * We don't want to pressure a particular node. | |
1600 | * So adding penalty to the first node in same | |
1601 | * distance group to make it round-robin. | |
1602 | */ | |
1603 | if (node_distance(local_node, node) != | |
1604 | node_distance(local_node, prev_node)) | |
1605 | node_load[node] += load; | |
1606 | prev_node = node; | |
1607 | load--; | |
1608 | for (i = 0; i < GFP_ZONETYPES; i++) { | |
1609 | zonelist = pgdat->node_zonelists + i; | |
1610 | for (j = 0; zonelist->zones[j] != NULL; j++); | |
1611 | ||
260b2367 | 1612 | k = highest_zone(i); |
1da177e4 LT |
1613 | |
1614 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, k); | |
1615 | zonelist->zones[j] = NULL; | |
1616 | } | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | #else /* CONFIG_NUMA */ | |
1621 | ||
1622 | static void __init build_zonelists(pg_data_t *pgdat) | |
1623 | { | |
1624 | int i, j, k, node, local_node; | |
1625 | ||
1626 | local_node = pgdat->node_id; | |
1627 | for (i = 0; i < GFP_ZONETYPES; i++) { | |
1628 | struct zonelist *zonelist; | |
1629 | ||
1630 | zonelist = pgdat->node_zonelists + i; | |
1631 | ||
1632 | j = 0; | |
260b2367 | 1633 | k = highest_zone(i); |
1da177e4 LT |
1634 | j = build_zonelists_node(pgdat, zonelist, j, k); |
1635 | /* | |
1636 | * Now we build the zonelist so that it contains the zones | |
1637 | * of all the other nodes. | |
1638 | * We don't want to pressure a particular node, so when | |
1639 | * building the zones for node N, we make sure that the | |
1640 | * zones coming right after the local ones are those from | |
1641 | * node N+1 (modulo N) | |
1642 | */ | |
1643 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
1644 | if (!node_online(node)) | |
1645 | continue; | |
1646 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, k); | |
1647 | } | |
1648 | for (node = 0; node < local_node; node++) { | |
1649 | if (!node_online(node)) | |
1650 | continue; | |
1651 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, k); | |
1652 | } | |
1653 | ||
1654 | zonelist->zones[j] = NULL; | |
1655 | } | |
1656 | } | |
1657 | ||
1658 | #endif /* CONFIG_NUMA */ | |
1659 | ||
1660 | void __init build_all_zonelists(void) | |
1661 | { | |
1662 | int i; | |
1663 | ||
1664 | for_each_online_node(i) | |
1665 | build_zonelists(NODE_DATA(i)); | |
1666 | printk("Built %i zonelists\n", num_online_nodes()); | |
1667 | cpuset_init_current_mems_allowed(); | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * Helper functions to size the waitqueue hash table. | |
1672 | * Essentially these want to choose hash table sizes sufficiently | |
1673 | * large so that collisions trying to wait on pages are rare. | |
1674 | * But in fact, the number of active page waitqueues on typical | |
1675 | * systems is ridiculously low, less than 200. So this is even | |
1676 | * conservative, even though it seems large. | |
1677 | * | |
1678 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
1679 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
1680 | */ | |
1681 | #define PAGES_PER_WAITQUEUE 256 | |
1682 | ||
1683 | static inline unsigned long wait_table_size(unsigned long pages) | |
1684 | { | |
1685 | unsigned long size = 1; | |
1686 | ||
1687 | pages /= PAGES_PER_WAITQUEUE; | |
1688 | ||
1689 | while (size < pages) | |
1690 | size <<= 1; | |
1691 | ||
1692 | /* | |
1693 | * Once we have dozens or even hundreds of threads sleeping | |
1694 | * on IO we've got bigger problems than wait queue collision. | |
1695 | * Limit the size of the wait table to a reasonable size. | |
1696 | */ | |
1697 | size = min(size, 4096UL); | |
1698 | ||
1699 | return max(size, 4UL); | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * This is an integer logarithm so that shifts can be used later | |
1704 | * to extract the more random high bits from the multiplicative | |
1705 | * hash function before the remainder is taken. | |
1706 | */ | |
1707 | static inline unsigned long wait_table_bits(unsigned long size) | |
1708 | { | |
1709 | return ffz(~size); | |
1710 | } | |
1711 | ||
1712 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
1713 | ||
1714 | static void __init calculate_zone_totalpages(struct pglist_data *pgdat, | |
1715 | unsigned long *zones_size, unsigned long *zholes_size) | |
1716 | { | |
1717 | unsigned long realtotalpages, totalpages = 0; | |
1718 | int i; | |
1719 | ||
1720 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1721 | totalpages += zones_size[i]; | |
1722 | pgdat->node_spanned_pages = totalpages; | |
1723 | ||
1724 | realtotalpages = totalpages; | |
1725 | if (zholes_size) | |
1726 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1727 | realtotalpages -= zholes_size[i]; | |
1728 | pgdat->node_present_pages = realtotalpages; | |
1729 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages); | |
1730 | } | |
1731 | ||
1732 | ||
1733 | /* | |
1734 | * Initially all pages are reserved - free ones are freed | |
1735 | * up by free_all_bootmem() once the early boot process is | |
1736 | * done. Non-atomic initialization, single-pass. | |
1737 | */ | |
3947be19 | 1738 | void __devinit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
1da177e4 LT |
1739 | unsigned long start_pfn) |
1740 | { | |
1da177e4 | 1741 | struct page *page; |
29751f69 AW |
1742 | unsigned long end_pfn = start_pfn + size; |
1743 | unsigned long pfn; | |
1da177e4 | 1744 | |
d41dee36 AW |
1745 | for (pfn = start_pfn; pfn < end_pfn; pfn++, page++) { |
1746 | if (!early_pfn_valid(pfn)) | |
1747 | continue; | |
1748 | page = pfn_to_page(pfn); | |
1749 | set_page_links(page, zone, nid, pfn); | |
b5810039 | 1750 | set_page_count(page, 1); |
1da177e4 LT |
1751 | reset_page_mapcount(page); |
1752 | SetPageReserved(page); | |
1753 | INIT_LIST_HEAD(&page->lru); | |
1754 | #ifdef WANT_PAGE_VIRTUAL | |
1755 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
1756 | if (!is_highmem_idx(zone)) | |
3212c6be | 1757 | set_page_address(page, __va(pfn << PAGE_SHIFT)); |
1da177e4 | 1758 | #endif |
1da177e4 LT |
1759 | } |
1760 | } | |
1761 | ||
1762 | void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone, | |
1763 | unsigned long size) | |
1764 | { | |
1765 | int order; | |
1766 | for (order = 0; order < MAX_ORDER ; order++) { | |
1767 | INIT_LIST_HEAD(&zone->free_area[order].free_list); | |
1768 | zone->free_area[order].nr_free = 0; | |
1769 | } | |
1770 | } | |
1771 | ||
d41dee36 AW |
1772 | #define ZONETABLE_INDEX(x, zone_nr) ((x << ZONES_SHIFT) | zone_nr) |
1773 | void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn, | |
1774 | unsigned long size) | |
1775 | { | |
1776 | unsigned long snum = pfn_to_section_nr(pfn); | |
1777 | unsigned long end = pfn_to_section_nr(pfn + size); | |
1778 | ||
1779 | if (FLAGS_HAS_NODE) | |
1780 | zone_table[ZONETABLE_INDEX(nid, zid)] = zone; | |
1781 | else | |
1782 | for (; snum <= end; snum++) | |
1783 | zone_table[ZONETABLE_INDEX(snum, zid)] = zone; | |
1784 | } | |
1785 | ||
1da177e4 LT |
1786 | #ifndef __HAVE_ARCH_MEMMAP_INIT |
1787 | #define memmap_init(size, nid, zone, start_pfn) \ | |
1788 | memmap_init_zone((size), (nid), (zone), (start_pfn)) | |
1789 | #endif | |
1790 | ||
e7c8d5c9 CL |
1791 | static int __devinit zone_batchsize(struct zone *zone) |
1792 | { | |
1793 | int batch; | |
1794 | ||
1795 | /* | |
1796 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 1797 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
1798 | * |
1799 | * OK, so we don't know how big the cache is. So guess. | |
1800 | */ | |
1801 | batch = zone->present_pages / 1024; | |
ba56e91c SR |
1802 | if (batch * PAGE_SIZE > 512 * 1024) |
1803 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
1804 | batch /= 4; /* We effectively *= 4 below */ |
1805 | if (batch < 1) | |
1806 | batch = 1; | |
1807 | ||
1808 | /* | |
0ceaacc9 NP |
1809 | * Clamp the batch to a 2^n - 1 value. Having a power |
1810 | * of 2 value was found to be more likely to have | |
1811 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 1812 | * |
0ceaacc9 NP |
1813 | * For example if 2 tasks are alternately allocating |
1814 | * batches of pages, one task can end up with a lot | |
1815 | * of pages of one half of the possible page colors | |
1816 | * and the other with pages of the other colors. | |
e7c8d5c9 | 1817 | */ |
0ceaacc9 | 1818 | batch = (1 << (fls(batch + batch/2)-1)) - 1; |
ba56e91c | 1819 | |
e7c8d5c9 CL |
1820 | return batch; |
1821 | } | |
1822 | ||
2caaad41 CL |
1823 | inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
1824 | { | |
1825 | struct per_cpu_pages *pcp; | |
1826 | ||
1c6fe946 MD |
1827 | memset(p, 0, sizeof(*p)); |
1828 | ||
2caaad41 CL |
1829 | pcp = &p->pcp[0]; /* hot */ |
1830 | pcp->count = 0; | |
2caaad41 CL |
1831 | pcp->high = 6 * batch; |
1832 | pcp->batch = max(1UL, 1 * batch); | |
1833 | INIT_LIST_HEAD(&pcp->list); | |
1834 | ||
1835 | pcp = &p->pcp[1]; /* cold*/ | |
1836 | pcp->count = 0; | |
2caaad41 | 1837 | pcp->high = 2 * batch; |
e46a5e28 | 1838 | pcp->batch = max(1UL, batch/2); |
2caaad41 CL |
1839 | INIT_LIST_HEAD(&pcp->list); |
1840 | } | |
1841 | ||
8ad4b1fb RS |
1842 | /* |
1843 | * setup_pagelist_highmark() sets the high water mark for hot per_cpu_pagelist | |
1844 | * to the value high for the pageset p. | |
1845 | */ | |
1846 | ||
1847 | static void setup_pagelist_highmark(struct per_cpu_pageset *p, | |
1848 | unsigned long high) | |
1849 | { | |
1850 | struct per_cpu_pages *pcp; | |
1851 | ||
1852 | pcp = &p->pcp[0]; /* hot list */ | |
1853 | pcp->high = high; | |
1854 | pcp->batch = max(1UL, high/4); | |
1855 | if ((high/4) > (PAGE_SHIFT * 8)) | |
1856 | pcp->batch = PAGE_SHIFT * 8; | |
1857 | } | |
1858 | ||
1859 | ||
e7c8d5c9 CL |
1860 | #ifdef CONFIG_NUMA |
1861 | /* | |
2caaad41 CL |
1862 | * Boot pageset table. One per cpu which is going to be used for all |
1863 | * zones and all nodes. The parameters will be set in such a way | |
1864 | * that an item put on a list will immediately be handed over to | |
1865 | * the buddy list. This is safe since pageset manipulation is done | |
1866 | * with interrupts disabled. | |
1867 | * | |
1868 | * Some NUMA counter updates may also be caught by the boot pagesets. | |
b7c84c6a CL |
1869 | * |
1870 | * The boot_pagesets must be kept even after bootup is complete for | |
1871 | * unused processors and/or zones. They do play a role for bootstrapping | |
1872 | * hotplugged processors. | |
1873 | * | |
1874 | * zoneinfo_show() and maybe other functions do | |
1875 | * not check if the processor is online before following the pageset pointer. | |
1876 | * Other parts of the kernel may not check if the zone is available. | |
2caaad41 CL |
1877 | */ |
1878 | static struct per_cpu_pageset | |
b7c84c6a | 1879 | boot_pageset[NR_CPUS]; |
2caaad41 CL |
1880 | |
1881 | /* | |
1882 | * Dynamically allocate memory for the | |
e7c8d5c9 CL |
1883 | * per cpu pageset array in struct zone. |
1884 | */ | |
1885 | static int __devinit process_zones(int cpu) | |
1886 | { | |
1887 | struct zone *zone, *dzone; | |
e7c8d5c9 CL |
1888 | |
1889 | for_each_zone(zone) { | |
e7c8d5c9 | 1890 | |
23316bc8 | 1891 | zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset), |
e7c8d5c9 | 1892 | GFP_KERNEL, cpu_to_node(cpu)); |
23316bc8 | 1893 | if (!zone_pcp(zone, cpu)) |
e7c8d5c9 | 1894 | goto bad; |
e7c8d5c9 | 1895 | |
23316bc8 | 1896 | setup_pageset(zone_pcp(zone, cpu), zone_batchsize(zone)); |
8ad4b1fb RS |
1897 | |
1898 | if (percpu_pagelist_fraction) | |
1899 | setup_pagelist_highmark(zone_pcp(zone, cpu), | |
1900 | (zone->present_pages / percpu_pagelist_fraction)); | |
e7c8d5c9 CL |
1901 | } |
1902 | ||
1903 | return 0; | |
1904 | bad: | |
1905 | for_each_zone(dzone) { | |
1906 | if (dzone == zone) | |
1907 | break; | |
23316bc8 NP |
1908 | kfree(zone_pcp(dzone, cpu)); |
1909 | zone_pcp(dzone, cpu) = NULL; | |
e7c8d5c9 CL |
1910 | } |
1911 | return -ENOMEM; | |
1912 | } | |
1913 | ||
1914 | static inline void free_zone_pagesets(int cpu) | |
1915 | { | |
e7c8d5c9 CL |
1916 | struct zone *zone; |
1917 | ||
1918 | for_each_zone(zone) { | |
1919 | struct per_cpu_pageset *pset = zone_pcp(zone, cpu); | |
1920 | ||
1921 | zone_pcp(zone, cpu) = NULL; | |
1922 | kfree(pset); | |
1923 | } | |
e7c8d5c9 CL |
1924 | } |
1925 | ||
1926 | static int __devinit pageset_cpuup_callback(struct notifier_block *nfb, | |
1927 | unsigned long action, | |
1928 | void *hcpu) | |
1929 | { | |
1930 | int cpu = (long)hcpu; | |
1931 | int ret = NOTIFY_OK; | |
1932 | ||
1933 | switch (action) { | |
1934 | case CPU_UP_PREPARE: | |
1935 | if (process_zones(cpu)) | |
1936 | ret = NOTIFY_BAD; | |
1937 | break; | |
b0d41693 | 1938 | case CPU_UP_CANCELED: |
e7c8d5c9 CL |
1939 | case CPU_DEAD: |
1940 | free_zone_pagesets(cpu); | |
1941 | break; | |
e7c8d5c9 CL |
1942 | default: |
1943 | break; | |
1944 | } | |
1945 | return ret; | |
1946 | } | |
1947 | ||
1948 | static struct notifier_block pageset_notifier = | |
1949 | { &pageset_cpuup_callback, NULL, 0 }; | |
1950 | ||
78d9955b | 1951 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 CL |
1952 | { |
1953 | int err; | |
1954 | ||
1955 | /* Initialize per_cpu_pageset for cpu 0. | |
1956 | * A cpuup callback will do this for every cpu | |
1957 | * as it comes online | |
1958 | */ | |
1959 | err = process_zones(smp_processor_id()); | |
1960 | BUG_ON(err); | |
1961 | register_cpu_notifier(&pageset_notifier); | |
1962 | } | |
1963 | ||
1964 | #endif | |
1965 | ||
ed8ece2e DH |
1966 | static __devinit |
1967 | void zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) | |
1968 | { | |
1969 | int i; | |
1970 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1971 | ||
1972 | /* | |
1973 | * The per-page waitqueue mechanism uses hashed waitqueues | |
1974 | * per zone. | |
1975 | */ | |
1976 | zone->wait_table_size = wait_table_size(zone_size_pages); | |
1977 | zone->wait_table_bits = wait_table_bits(zone->wait_table_size); | |
1978 | zone->wait_table = (wait_queue_head_t *) | |
1979 | alloc_bootmem_node(pgdat, zone->wait_table_size | |
1980 | * sizeof(wait_queue_head_t)); | |
1981 | ||
1982 | for(i = 0; i < zone->wait_table_size; ++i) | |
1983 | init_waitqueue_head(zone->wait_table + i); | |
1984 | } | |
1985 | ||
1986 | static __devinit void zone_pcp_init(struct zone *zone) | |
1987 | { | |
1988 | int cpu; | |
1989 | unsigned long batch = zone_batchsize(zone); | |
1990 | ||
1991 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
1992 | #ifdef CONFIG_NUMA | |
1993 | /* Early boot. Slab allocator not functional yet */ | |
23316bc8 | 1994 | zone_pcp(zone, cpu) = &boot_pageset[cpu]; |
ed8ece2e DH |
1995 | setup_pageset(&boot_pageset[cpu],0); |
1996 | #else | |
1997 | setup_pageset(zone_pcp(zone,cpu), batch); | |
1998 | #endif | |
1999 | } | |
2000 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n", | |
2001 | zone->name, zone->present_pages, batch); | |
2002 | } | |
2003 | ||
2004 | static __devinit void init_currently_empty_zone(struct zone *zone, | |
2005 | unsigned long zone_start_pfn, unsigned long size) | |
2006 | { | |
2007 | struct pglist_data *pgdat = zone->zone_pgdat; | |
2008 | ||
2009 | zone_wait_table_init(zone, size); | |
2010 | pgdat->nr_zones = zone_idx(zone) + 1; | |
2011 | ||
2012 | zone->zone_mem_map = pfn_to_page(zone_start_pfn); | |
2013 | zone->zone_start_pfn = zone_start_pfn; | |
2014 | ||
2015 | memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn); | |
2016 | ||
2017 | zone_init_free_lists(pgdat, zone, zone->spanned_pages); | |
2018 | } | |
2019 | ||
1da177e4 LT |
2020 | /* |
2021 | * Set up the zone data structures: | |
2022 | * - mark all pages reserved | |
2023 | * - mark all memory queues empty | |
2024 | * - clear the memory bitmaps | |
2025 | */ | |
2026 | static void __init free_area_init_core(struct pglist_data *pgdat, | |
2027 | unsigned long *zones_size, unsigned long *zholes_size) | |
2028 | { | |
ed8ece2e DH |
2029 | unsigned long j; |
2030 | int nid = pgdat->node_id; | |
1da177e4 LT |
2031 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
2032 | ||
208d54e5 | 2033 | pgdat_resize_init(pgdat); |
1da177e4 LT |
2034 | pgdat->nr_zones = 0; |
2035 | init_waitqueue_head(&pgdat->kswapd_wait); | |
2036 | pgdat->kswapd_max_order = 0; | |
2037 | ||
2038 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
2039 | struct zone *zone = pgdat->node_zones + j; | |
2040 | unsigned long size, realsize; | |
1da177e4 | 2041 | |
1da177e4 LT |
2042 | realsize = size = zones_size[j]; |
2043 | if (zholes_size) | |
2044 | realsize -= zholes_size[j]; | |
2045 | ||
a2f1b424 | 2046 | if (j < ZONE_HIGHMEM) |
1da177e4 LT |
2047 | nr_kernel_pages += realsize; |
2048 | nr_all_pages += realsize; | |
2049 | ||
2050 | zone->spanned_pages = size; | |
2051 | zone->present_pages = realsize; | |
2052 | zone->name = zone_names[j]; | |
2053 | spin_lock_init(&zone->lock); | |
2054 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 2055 | zone_seqlock_init(zone); |
1da177e4 LT |
2056 | zone->zone_pgdat = pgdat; |
2057 | zone->free_pages = 0; | |
2058 | ||
2059 | zone->temp_priority = zone->prev_priority = DEF_PRIORITY; | |
2060 | ||
ed8ece2e | 2061 | zone_pcp_init(zone); |
1da177e4 LT |
2062 | INIT_LIST_HEAD(&zone->active_list); |
2063 | INIT_LIST_HEAD(&zone->inactive_list); | |
2064 | zone->nr_scan_active = 0; | |
2065 | zone->nr_scan_inactive = 0; | |
2066 | zone->nr_active = 0; | |
2067 | zone->nr_inactive = 0; | |
53e9a615 | 2068 | atomic_set(&zone->reclaim_in_progress, 0); |
1da177e4 LT |
2069 | if (!size) |
2070 | continue; | |
2071 | ||
d41dee36 | 2072 | zonetable_add(zone, nid, j, zone_start_pfn, size); |
ed8ece2e | 2073 | init_currently_empty_zone(zone, zone_start_pfn, size); |
1da177e4 | 2074 | zone_start_pfn += size; |
1da177e4 LT |
2075 | } |
2076 | } | |
2077 | ||
2078 | static void __init alloc_node_mem_map(struct pglist_data *pgdat) | |
2079 | { | |
1da177e4 LT |
2080 | /* Skip empty nodes */ |
2081 | if (!pgdat->node_spanned_pages) | |
2082 | return; | |
2083 | ||
d41dee36 | 2084 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 LT |
2085 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
2086 | if (!pgdat->node_mem_map) { | |
d41dee36 AW |
2087 | unsigned long size; |
2088 | struct page *map; | |
2089 | ||
1da177e4 | 2090 | size = (pgdat->node_spanned_pages + 1) * sizeof(struct page); |
6f167ec7 DH |
2091 | map = alloc_remap(pgdat->node_id, size); |
2092 | if (!map) | |
2093 | map = alloc_bootmem_node(pgdat, size); | |
2094 | pgdat->node_mem_map = map; | |
1da177e4 | 2095 | } |
d41dee36 | 2096 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
2097 | /* |
2098 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
2099 | */ | |
2100 | if (pgdat == NODE_DATA(0)) | |
2101 | mem_map = NODE_DATA(0)->node_mem_map; | |
2102 | #endif | |
d41dee36 | 2103 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
2104 | } |
2105 | ||
2106 | void __init free_area_init_node(int nid, struct pglist_data *pgdat, | |
2107 | unsigned long *zones_size, unsigned long node_start_pfn, | |
2108 | unsigned long *zholes_size) | |
2109 | { | |
2110 | pgdat->node_id = nid; | |
2111 | pgdat->node_start_pfn = node_start_pfn; | |
2112 | calculate_zone_totalpages(pgdat, zones_size, zholes_size); | |
2113 | ||
2114 | alloc_node_mem_map(pgdat); | |
2115 | ||
2116 | free_area_init_core(pgdat, zones_size, zholes_size); | |
2117 | } | |
2118 | ||
93b7504e | 2119 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
2120 | static bootmem_data_t contig_bootmem_data; |
2121 | struct pglist_data contig_page_data = { .bdata = &contig_bootmem_data }; | |
2122 | ||
2123 | EXPORT_SYMBOL(contig_page_data); | |
93b7504e | 2124 | #endif |
1da177e4 LT |
2125 | |
2126 | void __init free_area_init(unsigned long *zones_size) | |
2127 | { | |
93b7504e | 2128 | free_area_init_node(0, NODE_DATA(0), zones_size, |
1da177e4 LT |
2129 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
2130 | } | |
1da177e4 LT |
2131 | |
2132 | #ifdef CONFIG_PROC_FS | |
2133 | ||
2134 | #include <linux/seq_file.h> | |
2135 | ||
2136 | static void *frag_start(struct seq_file *m, loff_t *pos) | |
2137 | { | |
2138 | pg_data_t *pgdat; | |
2139 | loff_t node = *pos; | |
2140 | ||
2141 | for (pgdat = pgdat_list; pgdat && node; pgdat = pgdat->pgdat_next) | |
2142 | --node; | |
2143 | ||
2144 | return pgdat; | |
2145 | } | |
2146 | ||
2147 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
2148 | { | |
2149 | pg_data_t *pgdat = (pg_data_t *)arg; | |
2150 | ||
2151 | (*pos)++; | |
2152 | return pgdat->pgdat_next; | |
2153 | } | |
2154 | ||
2155 | static void frag_stop(struct seq_file *m, void *arg) | |
2156 | { | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * This walks the free areas for each zone. | |
2161 | */ | |
2162 | static int frag_show(struct seq_file *m, void *arg) | |
2163 | { | |
2164 | pg_data_t *pgdat = (pg_data_t *)arg; | |
2165 | struct zone *zone; | |
2166 | struct zone *node_zones = pgdat->node_zones; | |
2167 | unsigned long flags; | |
2168 | int order; | |
2169 | ||
2170 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
f3fe6512 | 2171 | if (!populated_zone(zone)) |
1da177e4 LT |
2172 | continue; |
2173 | ||
2174 | spin_lock_irqsave(&zone->lock, flags); | |
2175 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
2176 | for (order = 0; order < MAX_ORDER; ++order) | |
2177 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
2178 | spin_unlock_irqrestore(&zone->lock, flags); | |
2179 | seq_putc(m, '\n'); | |
2180 | } | |
2181 | return 0; | |
2182 | } | |
2183 | ||
2184 | struct seq_operations fragmentation_op = { | |
2185 | .start = frag_start, | |
2186 | .next = frag_next, | |
2187 | .stop = frag_stop, | |
2188 | .show = frag_show, | |
2189 | }; | |
2190 | ||
295ab934 ND |
2191 | /* |
2192 | * Output information about zones in @pgdat. | |
2193 | */ | |
2194 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
2195 | { | |
2196 | pg_data_t *pgdat = arg; | |
2197 | struct zone *zone; | |
2198 | struct zone *node_zones = pgdat->node_zones; | |
2199 | unsigned long flags; | |
2200 | ||
2201 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) { | |
2202 | int i; | |
2203 | ||
f3fe6512 | 2204 | if (!populated_zone(zone)) |
295ab934 ND |
2205 | continue; |
2206 | ||
2207 | spin_lock_irqsave(&zone->lock, flags); | |
2208 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
2209 | seq_printf(m, | |
2210 | "\n pages free %lu" | |
2211 | "\n min %lu" | |
2212 | "\n low %lu" | |
2213 | "\n high %lu" | |
2214 | "\n active %lu" | |
2215 | "\n inactive %lu" | |
2216 | "\n scanned %lu (a: %lu i: %lu)" | |
2217 | "\n spanned %lu" | |
2218 | "\n present %lu", | |
2219 | zone->free_pages, | |
2220 | zone->pages_min, | |
2221 | zone->pages_low, | |
2222 | zone->pages_high, | |
2223 | zone->nr_active, | |
2224 | zone->nr_inactive, | |
2225 | zone->pages_scanned, | |
2226 | zone->nr_scan_active, zone->nr_scan_inactive, | |
2227 | zone->spanned_pages, | |
2228 | zone->present_pages); | |
2229 | seq_printf(m, | |
2230 | "\n protection: (%lu", | |
2231 | zone->lowmem_reserve[0]); | |
2232 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
2233 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
2234 | seq_printf(m, | |
2235 | ")" | |
2236 | "\n pagesets"); | |
23316bc8 | 2237 | for_each_online_cpu(i) { |
295ab934 ND |
2238 | struct per_cpu_pageset *pageset; |
2239 | int j; | |
2240 | ||
e7c8d5c9 | 2241 | pageset = zone_pcp(zone, i); |
295ab934 ND |
2242 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { |
2243 | if (pageset->pcp[j].count) | |
2244 | break; | |
2245 | } | |
2246 | if (j == ARRAY_SIZE(pageset->pcp)) | |
2247 | continue; | |
2248 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
2249 | seq_printf(m, | |
2250 | "\n cpu: %i pcp: %i" | |
2251 | "\n count: %i" | |
295ab934 ND |
2252 | "\n high: %i" |
2253 | "\n batch: %i", | |
2254 | i, j, | |
2255 | pageset->pcp[j].count, | |
295ab934 ND |
2256 | pageset->pcp[j].high, |
2257 | pageset->pcp[j].batch); | |
2258 | } | |
2259 | #ifdef CONFIG_NUMA | |
2260 | seq_printf(m, | |
2261 | "\n numa_hit: %lu" | |
2262 | "\n numa_miss: %lu" | |
2263 | "\n numa_foreign: %lu" | |
2264 | "\n interleave_hit: %lu" | |
2265 | "\n local_node: %lu" | |
2266 | "\n other_node: %lu", | |
2267 | pageset->numa_hit, | |
2268 | pageset->numa_miss, | |
2269 | pageset->numa_foreign, | |
2270 | pageset->interleave_hit, | |
2271 | pageset->local_node, | |
2272 | pageset->other_node); | |
2273 | #endif | |
2274 | } | |
2275 | seq_printf(m, | |
2276 | "\n all_unreclaimable: %u" | |
2277 | "\n prev_priority: %i" | |
2278 | "\n temp_priority: %i" | |
2279 | "\n start_pfn: %lu", | |
2280 | zone->all_unreclaimable, | |
2281 | zone->prev_priority, | |
2282 | zone->temp_priority, | |
2283 | zone->zone_start_pfn); | |
2284 | spin_unlock_irqrestore(&zone->lock, flags); | |
2285 | seq_putc(m, '\n'); | |
2286 | } | |
2287 | return 0; | |
2288 | } | |
2289 | ||
2290 | struct seq_operations zoneinfo_op = { | |
2291 | .start = frag_start, /* iterate over all zones. The same as in | |
2292 | * fragmentation. */ | |
2293 | .next = frag_next, | |
2294 | .stop = frag_stop, | |
2295 | .show = zoneinfo_show, | |
2296 | }; | |
2297 | ||
1da177e4 LT |
2298 | static char *vmstat_text[] = { |
2299 | "nr_dirty", | |
2300 | "nr_writeback", | |
2301 | "nr_unstable", | |
2302 | "nr_page_table_pages", | |
2303 | "nr_mapped", | |
2304 | "nr_slab", | |
2305 | ||
2306 | "pgpgin", | |
2307 | "pgpgout", | |
2308 | "pswpin", | |
2309 | "pswpout", | |
1da177e4 | 2310 | |
9328b8fa | 2311 | "pgalloc_high", |
1da177e4 | 2312 | "pgalloc_normal", |
9328b8fa | 2313 | "pgalloc_dma32", |
1da177e4 | 2314 | "pgalloc_dma", |
9328b8fa | 2315 | |
1da177e4 LT |
2316 | "pgfree", |
2317 | "pgactivate", | |
2318 | "pgdeactivate", | |
2319 | ||
2320 | "pgfault", | |
2321 | "pgmajfault", | |
9328b8fa | 2322 | |
1da177e4 LT |
2323 | "pgrefill_high", |
2324 | "pgrefill_normal", | |
9328b8fa | 2325 | "pgrefill_dma32", |
1da177e4 LT |
2326 | "pgrefill_dma", |
2327 | ||
2328 | "pgsteal_high", | |
2329 | "pgsteal_normal", | |
9328b8fa | 2330 | "pgsteal_dma32", |
1da177e4 | 2331 | "pgsteal_dma", |
9328b8fa | 2332 | |
1da177e4 LT |
2333 | "pgscan_kswapd_high", |
2334 | "pgscan_kswapd_normal", | |
9328b8fa | 2335 | "pgscan_kswapd_dma32", |
1da177e4 | 2336 | "pgscan_kswapd_dma", |
9328b8fa | 2337 | |
1da177e4 LT |
2338 | "pgscan_direct_high", |
2339 | "pgscan_direct_normal", | |
9328b8fa | 2340 | "pgscan_direct_dma32", |
1da177e4 | 2341 | "pgscan_direct_dma", |
1da177e4 | 2342 | |
9328b8fa | 2343 | "pginodesteal", |
1da177e4 LT |
2344 | "slabs_scanned", |
2345 | "kswapd_steal", | |
2346 | "kswapd_inodesteal", | |
2347 | "pageoutrun", | |
2348 | "allocstall", | |
2349 | ||
2350 | "pgrotated", | |
edfbe2b0 | 2351 | "nr_bounce", |
1da177e4 LT |
2352 | }; |
2353 | ||
2354 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
2355 | { | |
2356 | struct page_state *ps; | |
2357 | ||
2358 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
2359 | return NULL; | |
2360 | ||
2361 | ps = kmalloc(sizeof(*ps), GFP_KERNEL); | |
2362 | m->private = ps; | |
2363 | if (!ps) | |
2364 | return ERR_PTR(-ENOMEM); | |
2365 | get_full_page_state(ps); | |
2366 | ps->pgpgin /= 2; /* sectors -> kbytes */ | |
2367 | ps->pgpgout /= 2; | |
2368 | return (unsigned long *)ps + *pos; | |
2369 | } | |
2370 | ||
2371 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
2372 | { | |
2373 | (*pos)++; | |
2374 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
2375 | return NULL; | |
2376 | return (unsigned long *)m->private + *pos; | |
2377 | } | |
2378 | ||
2379 | static int vmstat_show(struct seq_file *m, void *arg) | |
2380 | { | |
2381 | unsigned long *l = arg; | |
2382 | unsigned long off = l - (unsigned long *)m->private; | |
2383 | ||
2384 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
2385 | return 0; | |
2386 | } | |
2387 | ||
2388 | static void vmstat_stop(struct seq_file *m, void *arg) | |
2389 | { | |
2390 | kfree(m->private); | |
2391 | m->private = NULL; | |
2392 | } | |
2393 | ||
2394 | struct seq_operations vmstat_op = { | |
2395 | .start = vmstat_start, | |
2396 | .next = vmstat_next, | |
2397 | .stop = vmstat_stop, | |
2398 | .show = vmstat_show, | |
2399 | }; | |
2400 | ||
2401 | #endif /* CONFIG_PROC_FS */ | |
2402 | ||
2403 | #ifdef CONFIG_HOTPLUG_CPU | |
2404 | static int page_alloc_cpu_notify(struct notifier_block *self, | |
2405 | unsigned long action, void *hcpu) | |
2406 | { | |
2407 | int cpu = (unsigned long)hcpu; | |
2408 | long *count; | |
2409 | unsigned long *src, *dest; | |
2410 | ||
2411 | if (action == CPU_DEAD) { | |
2412 | int i; | |
2413 | ||
2414 | /* Drain local pagecache count. */ | |
2415 | count = &per_cpu(nr_pagecache_local, cpu); | |
2416 | atomic_add(*count, &nr_pagecache); | |
2417 | *count = 0; | |
2418 | local_irq_disable(); | |
2419 | __drain_pages(cpu); | |
2420 | ||
2421 | /* Add dead cpu's page_states to our own. */ | |
2422 | dest = (unsigned long *)&__get_cpu_var(page_states); | |
2423 | src = (unsigned long *)&per_cpu(page_states, cpu); | |
2424 | ||
2425 | for (i = 0; i < sizeof(struct page_state)/sizeof(unsigned long); | |
2426 | i++) { | |
2427 | dest[i] += src[i]; | |
2428 | src[i] = 0; | |
2429 | } | |
2430 | ||
2431 | local_irq_enable(); | |
2432 | } | |
2433 | return NOTIFY_OK; | |
2434 | } | |
2435 | #endif /* CONFIG_HOTPLUG_CPU */ | |
2436 | ||
2437 | void __init page_alloc_init(void) | |
2438 | { | |
2439 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * setup_per_zone_lowmem_reserve - called whenever | |
2444 | * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone | |
2445 | * has a correct pages reserved value, so an adequate number of | |
2446 | * pages are left in the zone after a successful __alloc_pages(). | |
2447 | */ | |
2448 | static void setup_per_zone_lowmem_reserve(void) | |
2449 | { | |
2450 | struct pglist_data *pgdat; | |
2451 | int j, idx; | |
2452 | ||
2453 | for_each_pgdat(pgdat) { | |
2454 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
2455 | struct zone *zone = pgdat->node_zones + j; | |
2456 | unsigned long present_pages = zone->present_pages; | |
2457 | ||
2458 | zone->lowmem_reserve[j] = 0; | |
2459 | ||
2460 | for (idx = j-1; idx >= 0; idx--) { | |
2461 | struct zone *lower_zone; | |
2462 | ||
2463 | if (sysctl_lowmem_reserve_ratio[idx] < 1) | |
2464 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
2465 | ||
2466 | lower_zone = pgdat->node_zones + idx; | |
2467 | lower_zone->lowmem_reserve[j] = present_pages / | |
2468 | sysctl_lowmem_reserve_ratio[idx]; | |
2469 | present_pages += lower_zone->present_pages; | |
2470 | } | |
2471 | } | |
2472 | } | |
2473 | } | |
2474 | ||
2475 | /* | |
2476 | * setup_per_zone_pages_min - called when min_free_kbytes changes. Ensures | |
2477 | * that the pages_{min,low,high} values for each zone are set correctly | |
2478 | * with respect to min_free_kbytes. | |
2479 | */ | |
3947be19 | 2480 | void setup_per_zone_pages_min(void) |
1da177e4 LT |
2481 | { |
2482 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
2483 | unsigned long lowmem_pages = 0; | |
2484 | struct zone *zone; | |
2485 | unsigned long flags; | |
2486 | ||
2487 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
2488 | for_each_zone(zone) { | |
2489 | if (!is_highmem(zone)) | |
2490 | lowmem_pages += zone->present_pages; | |
2491 | } | |
2492 | ||
2493 | for_each_zone(zone) { | |
669ed175 | 2494 | unsigned long tmp; |
1da177e4 | 2495 | spin_lock_irqsave(&zone->lru_lock, flags); |
669ed175 | 2496 | tmp = (pages_min * zone->present_pages) / lowmem_pages; |
1da177e4 LT |
2497 | if (is_highmem(zone)) { |
2498 | /* | |
669ed175 NP |
2499 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
2500 | * need highmem pages, so cap pages_min to a small | |
2501 | * value here. | |
2502 | * | |
2503 | * The (pages_high-pages_low) and (pages_low-pages_min) | |
2504 | * deltas controls asynch page reclaim, and so should | |
2505 | * not be capped for highmem. | |
1da177e4 LT |
2506 | */ |
2507 | int min_pages; | |
2508 | ||
2509 | min_pages = zone->present_pages / 1024; | |
2510 | if (min_pages < SWAP_CLUSTER_MAX) | |
2511 | min_pages = SWAP_CLUSTER_MAX; | |
2512 | if (min_pages > 128) | |
2513 | min_pages = 128; | |
2514 | zone->pages_min = min_pages; | |
2515 | } else { | |
669ed175 NP |
2516 | /* |
2517 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
2518 | * proportionate to the zone's size. |
2519 | */ | |
669ed175 | 2520 | zone->pages_min = tmp; |
1da177e4 LT |
2521 | } |
2522 | ||
669ed175 NP |
2523 | zone->pages_low = zone->pages_min + tmp / 4; |
2524 | zone->pages_high = zone->pages_min + tmp / 2; | |
1da177e4 LT |
2525 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
2526 | } | |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * Initialise min_free_kbytes. | |
2531 | * | |
2532 | * For small machines we want it small (128k min). For large machines | |
2533 | * we want it large (64MB max). But it is not linear, because network | |
2534 | * bandwidth does not increase linearly with machine size. We use | |
2535 | * | |
2536 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: | |
2537 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) | |
2538 | * | |
2539 | * which yields | |
2540 | * | |
2541 | * 16MB: 512k | |
2542 | * 32MB: 724k | |
2543 | * 64MB: 1024k | |
2544 | * 128MB: 1448k | |
2545 | * 256MB: 2048k | |
2546 | * 512MB: 2896k | |
2547 | * 1024MB: 4096k | |
2548 | * 2048MB: 5792k | |
2549 | * 4096MB: 8192k | |
2550 | * 8192MB: 11584k | |
2551 | * 16384MB: 16384k | |
2552 | */ | |
2553 | static int __init init_per_zone_pages_min(void) | |
2554 | { | |
2555 | unsigned long lowmem_kbytes; | |
2556 | ||
2557 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
2558 | ||
2559 | min_free_kbytes = int_sqrt(lowmem_kbytes * 16); | |
2560 | if (min_free_kbytes < 128) | |
2561 | min_free_kbytes = 128; | |
2562 | if (min_free_kbytes > 65536) | |
2563 | min_free_kbytes = 65536; | |
2564 | setup_per_zone_pages_min(); | |
2565 | setup_per_zone_lowmem_reserve(); | |
2566 | return 0; | |
2567 | } | |
2568 | module_init(init_per_zone_pages_min) | |
2569 | ||
2570 | /* | |
2571 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so | |
2572 | * that we can call two helper functions whenever min_free_kbytes | |
2573 | * changes. | |
2574 | */ | |
2575 | int min_free_kbytes_sysctl_handler(ctl_table *table, int write, | |
2576 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
2577 | { | |
2578 | proc_dointvec(table, write, file, buffer, length, ppos); | |
2579 | setup_per_zone_pages_min(); | |
2580 | return 0; | |
2581 | } | |
2582 | ||
2583 | /* | |
2584 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
2585 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
2586 | * whenever sysctl_lowmem_reserve_ratio changes. | |
2587 | * | |
2588 | * The reserve ratio obviously has absolutely no relation with the | |
2589 | * pages_min watermarks. The lowmem reserve ratio can only make sense | |
2590 | * if in function of the boot time zone sizes. | |
2591 | */ | |
2592 | int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, | |
2593 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
2594 | { | |
2595 | proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
2596 | setup_per_zone_lowmem_reserve(); | |
2597 | return 0; | |
2598 | } | |
2599 | ||
8ad4b1fb RS |
2600 | /* |
2601 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
2602 | * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist | |
2603 | * can have before it gets flushed back to buddy allocator. | |
2604 | */ | |
2605 | ||
2606 | int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, | |
2607 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
2608 | { | |
2609 | struct zone *zone; | |
2610 | unsigned int cpu; | |
2611 | int ret; | |
2612 | ||
2613 | ret = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
2614 | if (!write || (ret == -EINVAL)) | |
2615 | return ret; | |
2616 | for_each_zone(zone) { | |
2617 | for_each_online_cpu(cpu) { | |
2618 | unsigned long high; | |
2619 | high = zone->present_pages / percpu_pagelist_fraction; | |
2620 | setup_pagelist_highmark(zone_pcp(zone, cpu), high); | |
2621 | } | |
2622 | } | |
2623 | return 0; | |
2624 | } | |
2625 | ||
1da177e4 LT |
2626 | __initdata int hashdist = HASHDIST_DEFAULT; |
2627 | ||
2628 | #ifdef CONFIG_NUMA | |
2629 | static int __init set_hashdist(char *str) | |
2630 | { | |
2631 | if (!str) | |
2632 | return 0; | |
2633 | hashdist = simple_strtoul(str, &str, 0); | |
2634 | return 1; | |
2635 | } | |
2636 | __setup("hashdist=", set_hashdist); | |
2637 | #endif | |
2638 | ||
2639 | /* | |
2640 | * allocate a large system hash table from bootmem | |
2641 | * - it is assumed that the hash table must contain an exact power-of-2 | |
2642 | * quantity of entries | |
2643 | * - limit is the number of hash buckets, not the total allocation size | |
2644 | */ | |
2645 | void *__init alloc_large_system_hash(const char *tablename, | |
2646 | unsigned long bucketsize, | |
2647 | unsigned long numentries, | |
2648 | int scale, | |
2649 | int flags, | |
2650 | unsigned int *_hash_shift, | |
2651 | unsigned int *_hash_mask, | |
2652 | unsigned long limit) | |
2653 | { | |
2654 | unsigned long long max = limit; | |
2655 | unsigned long log2qty, size; | |
2656 | void *table = NULL; | |
2657 | ||
2658 | /* allow the kernel cmdline to have a say */ | |
2659 | if (!numentries) { | |
2660 | /* round applicable memory size up to nearest megabyte */ | |
2661 | numentries = (flags & HASH_HIGHMEM) ? nr_all_pages : nr_kernel_pages; | |
2662 | numentries += (1UL << (20 - PAGE_SHIFT)) - 1; | |
2663 | numentries >>= 20 - PAGE_SHIFT; | |
2664 | numentries <<= 20 - PAGE_SHIFT; | |
2665 | ||
2666 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
2667 | if (scale > PAGE_SHIFT) | |
2668 | numentries >>= (scale - PAGE_SHIFT); | |
2669 | else | |
2670 | numentries <<= (PAGE_SHIFT - scale); | |
2671 | } | |
2672 | /* rounded up to nearest power of 2 in size */ | |
2673 | numentries = 1UL << (long_log2(numentries) + 1); | |
2674 | ||
2675 | /* limit allocation size to 1/16 total memory by default */ | |
2676 | if (max == 0) { | |
2677 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
2678 | do_div(max, bucketsize); | |
2679 | } | |
2680 | ||
2681 | if (numentries > max) | |
2682 | numentries = max; | |
2683 | ||
2684 | log2qty = long_log2(numentries); | |
2685 | ||
2686 | do { | |
2687 | size = bucketsize << log2qty; | |
2688 | if (flags & HASH_EARLY) | |
2689 | table = alloc_bootmem(size); | |
2690 | else if (hashdist) | |
2691 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
2692 | else { | |
2693 | unsigned long order; | |
2694 | for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++) | |
2695 | ; | |
2696 | table = (void*) __get_free_pages(GFP_ATOMIC, order); | |
2697 | } | |
2698 | } while (!table && size > PAGE_SIZE && --log2qty); | |
2699 | ||
2700 | if (!table) | |
2701 | panic("Failed to allocate %s hash table\n", tablename); | |
2702 | ||
2703 | printk("%s hash table entries: %d (order: %d, %lu bytes)\n", | |
2704 | tablename, | |
2705 | (1U << log2qty), | |
2706 | long_log2(size) - PAGE_SHIFT, | |
2707 | size); | |
2708 | ||
2709 | if (_hash_shift) | |
2710 | *_hash_shift = log2qty; | |
2711 | if (_hash_mask) | |
2712 | *_hash_mask = (1 << log2qty) - 1; | |
2713 | ||
2714 | return table; | |
2715 | } |