Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_MMZONE_H |
2 | #define _LINUX_MMZONE_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | #ifndef __ASSEMBLY__ | |
6 | ||
1da177e4 LT |
7 | #include <linux/spinlock.h> |
8 | #include <linux/list.h> | |
9 | #include <linux/wait.h> | |
10 | #include <linux/cache.h> | |
11 | #include <linux/threads.h> | |
12 | #include <linux/numa.h> | |
13 | #include <linux/init.h> | |
bdc8cb98 | 14 | #include <linux/seqlock.h> |
8357f869 | 15 | #include <linux/nodemask.h> |
1da177e4 | 16 | #include <asm/atomic.h> |
93ff66bf | 17 | #include <asm/page.h> |
1da177e4 LT |
18 | |
19 | /* Free memory management - zoned buddy allocator. */ | |
20 | #ifndef CONFIG_FORCE_MAX_ZONEORDER | |
21 | #define MAX_ORDER 11 | |
22 | #else | |
23 | #define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER | |
24 | #endif | |
e984bb43 | 25 | #define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1)) |
1da177e4 LT |
26 | |
27 | struct free_area { | |
28 | struct list_head free_list; | |
29 | unsigned long nr_free; | |
30 | }; | |
31 | ||
32 | struct pglist_data; | |
33 | ||
34 | /* | |
35 | * zone->lock and zone->lru_lock are two of the hottest locks in the kernel. | |
36 | * So add a wild amount of padding here to ensure that they fall into separate | |
37 | * cachelines. There are very few zone structures in the machine, so space | |
38 | * consumption is not a concern here. | |
39 | */ | |
40 | #if defined(CONFIG_SMP) | |
41 | struct zone_padding { | |
42 | char x[0]; | |
22fc6ecc | 43 | } ____cacheline_internodealigned_in_smp; |
1da177e4 LT |
44 | #define ZONE_PADDING(name) struct zone_padding name; |
45 | #else | |
46 | #define ZONE_PADDING(name) | |
47 | #endif | |
48 | ||
2244b95a | 49 | enum zone_stat_item { |
f3dbd344 CL |
50 | NR_ANON_PAGES, /* Mapped anonymous pages */ |
51 | NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. | |
65ba55f5 | 52 | only modified from process context */ |
347ce434 | 53 | NR_FILE_PAGES, |
972d1a7b CL |
54 | NR_SLAB_RECLAIMABLE, |
55 | NR_SLAB_UNRECLAIMABLE, | |
df849a15 | 56 | NR_PAGETABLE, /* used for pagetables */ |
b1e7a8fd | 57 | NR_FILE_DIRTY, |
ce866b34 | 58 | NR_WRITEBACK, |
fd39fc85 | 59 | NR_UNSTABLE_NFS, /* NFS unstable pages */ |
d2c5e30c | 60 | NR_BOUNCE, |
ca889e6c CL |
61 | #ifdef CONFIG_NUMA |
62 | NUMA_HIT, /* allocated in intended node */ | |
63 | NUMA_MISS, /* allocated in non intended node */ | |
64 | NUMA_FOREIGN, /* was intended here, hit elsewhere */ | |
65 | NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */ | |
66 | NUMA_LOCAL, /* allocation from local node */ | |
67 | NUMA_OTHER, /* allocation from other node */ | |
68 | #endif | |
2244b95a CL |
69 | NR_VM_ZONE_STAT_ITEMS }; |
70 | ||
1da177e4 LT |
71 | struct per_cpu_pages { |
72 | int count; /* number of pages in the list */ | |
1da177e4 LT |
73 | int high; /* high watermark, emptying needed */ |
74 | int batch; /* chunk size for buddy add/remove */ | |
75 | struct list_head list; /* the list of pages */ | |
76 | }; | |
77 | ||
78 | struct per_cpu_pageset { | |
79 | struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */ | |
2244b95a | 80 | #ifdef CONFIG_SMP |
df9ecaba | 81 | s8 stat_threshold; |
2244b95a CL |
82 | s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS]; |
83 | #endif | |
1da177e4 LT |
84 | } ____cacheline_aligned_in_smp; |
85 | ||
e7c8d5c9 CL |
86 | #ifdef CONFIG_NUMA |
87 | #define zone_pcp(__z, __cpu) ((__z)->pageset[(__cpu)]) | |
88 | #else | |
89 | #define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)]) | |
90 | #endif | |
91 | ||
2f1b6248 CL |
92 | enum zone_type { |
93 | /* | |
94 | * ZONE_DMA is used when there are devices that are not able | |
95 | * to do DMA to all of addressable memory (ZONE_NORMAL). Then we | |
96 | * carve out the portion of memory that is needed for these devices. | |
97 | * The range is arch specific. | |
98 | * | |
99 | * Some examples | |
100 | * | |
101 | * Architecture Limit | |
102 | * --------------------------- | |
103 | * parisc, ia64, sparc <4G | |
104 | * s390 <2G | |
105 | * arm26 <48M | |
106 | * arm Various | |
107 | * alpha Unlimited or 0-16MB. | |
108 | * | |
109 | * i386, x86_64 and multiple other arches | |
110 | * <16M. | |
111 | */ | |
112 | ZONE_DMA, | |
fb0e7942 | 113 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 CL |
114 | /* |
115 | * x86_64 needs two ZONE_DMAs because it supports devices that are | |
116 | * only able to do DMA to the lower 16M but also 32 bit devices that | |
117 | * can only do DMA areas below 4G. | |
118 | */ | |
119 | ZONE_DMA32, | |
fb0e7942 | 120 | #endif |
2f1b6248 CL |
121 | /* |
122 | * Normal addressable memory is in ZONE_NORMAL. DMA operations can be | |
123 | * performed on pages in ZONE_NORMAL if the DMA devices support | |
124 | * transfers to all addressable memory. | |
125 | */ | |
126 | ZONE_NORMAL, | |
e53ef38d | 127 | #ifdef CONFIG_HIGHMEM |
2f1b6248 CL |
128 | /* |
129 | * A memory area that is only addressable by the kernel through | |
130 | * mapping portions into its own address space. This is for example | |
131 | * used by i386 to allow the kernel to address the memory beyond | |
132 | * 900MB. The kernel will set up special mappings (page | |
133 | * table entries on i386) for each page that the kernel needs to | |
134 | * access. | |
135 | */ | |
136 | ZONE_HIGHMEM, | |
e53ef38d | 137 | #endif |
2f1b6248 CL |
138 | MAX_NR_ZONES |
139 | }; | |
1da177e4 | 140 | |
1da177e4 LT |
141 | /* |
142 | * When a memory allocation must conform to specific limitations (such | |
143 | * as being suitable for DMA) the caller will pass in hints to the | |
144 | * allocator in the gfp_mask, in the zone modifier bits. These bits | |
145 | * are used to select a priority ordered list of memory zones which | |
19655d34 | 146 | * match the requested limits. See gfp_zone() in include/linux/gfp.h |
1da177e4 | 147 | */ |
fb0e7942 | 148 | |
19655d34 CL |
149 | #if !defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_HIGHMEM) |
150 | #define ZONES_SHIFT 1 | |
e53ef38d | 151 | #else |
19655d34 | 152 | #define ZONES_SHIFT 2 |
fb0e7942 | 153 | #endif |
1da177e4 | 154 | |
1da177e4 LT |
155 | struct zone { |
156 | /* Fields commonly accessed by the page allocator */ | |
157 | unsigned long free_pages; | |
158 | unsigned long pages_min, pages_low, pages_high; | |
159 | /* | |
160 | * We don't know if the memory that we're going to allocate will be freeable | |
161 | * or/and it will be released eventually, so to avoid totally wasting several | |
162 | * GB of ram we must reserve some of the lower zone memory (otherwise we risk | |
163 | * to run OOM on the lower zones despite there's tons of freeable ram | |
164 | * on the higher zones). This array is recalculated at runtime if the | |
165 | * sysctl_lowmem_reserve_ratio sysctl changes. | |
166 | */ | |
167 | unsigned long lowmem_reserve[MAX_NR_ZONES]; | |
168 | ||
e7c8d5c9 | 169 | #ifdef CONFIG_NUMA |
9614634f CL |
170 | /* |
171 | * zone reclaim becomes active if more unmapped pages exist. | |
172 | */ | |
8417bba4 | 173 | unsigned long min_unmapped_pages; |
e7c8d5c9 CL |
174 | struct per_cpu_pageset *pageset[NR_CPUS]; |
175 | #else | |
1da177e4 | 176 | struct per_cpu_pageset pageset[NR_CPUS]; |
e7c8d5c9 | 177 | #endif |
1da177e4 LT |
178 | /* |
179 | * free areas of different sizes | |
180 | */ | |
181 | spinlock_t lock; | |
bdc8cb98 DH |
182 | #ifdef CONFIG_MEMORY_HOTPLUG |
183 | /* see spanned/present_pages for more description */ | |
184 | seqlock_t span_seqlock; | |
185 | #endif | |
1da177e4 LT |
186 | struct free_area free_area[MAX_ORDER]; |
187 | ||
188 | ||
189 | ZONE_PADDING(_pad1_) | |
190 | ||
191 | /* Fields commonly accessed by the page reclaim scanner */ | |
192 | spinlock_t lru_lock; | |
193 | struct list_head active_list; | |
194 | struct list_head inactive_list; | |
195 | unsigned long nr_scan_active; | |
196 | unsigned long nr_scan_inactive; | |
197 | unsigned long nr_active; | |
198 | unsigned long nr_inactive; | |
199 | unsigned long pages_scanned; /* since last reclaim */ | |
200 | int all_unreclaimable; /* All pages pinned */ | |
201 | ||
1e7e5a90 MH |
202 | /* A count of how many reclaimers are scanning this zone */ |
203 | atomic_t reclaim_in_progress; | |
753ee728 | 204 | |
2244b95a CL |
205 | /* Zone statistics */ |
206 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
9eeff239 | 207 | |
1da177e4 LT |
208 | /* |
209 | * prev_priority holds the scanning priority for this zone. It is | |
210 | * defined as the scanning priority at which we achieved our reclaim | |
211 | * target at the previous try_to_free_pages() or balance_pgdat() | |
212 | * invokation. | |
213 | * | |
214 | * We use prev_priority as a measure of how much stress page reclaim is | |
215 | * under - it drives the swappiness decision: whether to unmap mapped | |
216 | * pages. | |
217 | * | |
218 | * temp_priority is used to remember the scanning priority at which | |
219 | * this zone was successfully refilled to free_pages == pages_high. | |
220 | * | |
221 | * Access to both these fields is quite racy even on uniprocessor. But | |
222 | * it is expected to average out OK. | |
223 | */ | |
224 | int temp_priority; | |
225 | int prev_priority; | |
226 | ||
227 | ||
228 | ZONE_PADDING(_pad2_) | |
229 | /* Rarely used or read-mostly fields */ | |
230 | ||
231 | /* | |
232 | * wait_table -- the array holding the hash table | |
02b694de | 233 | * wait_table_hash_nr_entries -- the size of the hash table array |
1da177e4 LT |
234 | * wait_table_bits -- wait_table_size == (1 << wait_table_bits) |
235 | * | |
236 | * The purpose of all these is to keep track of the people | |
237 | * waiting for a page to become available and make them | |
238 | * runnable again when possible. The trouble is that this | |
239 | * consumes a lot of space, especially when so few things | |
240 | * wait on pages at a given time. So instead of using | |
241 | * per-page waitqueues, we use a waitqueue hash table. | |
242 | * | |
243 | * The bucket discipline is to sleep on the same queue when | |
244 | * colliding and wake all in that wait queue when removing. | |
245 | * When something wakes, it must check to be sure its page is | |
246 | * truly available, a la thundering herd. The cost of a | |
247 | * collision is great, but given the expected load of the | |
248 | * table, they should be so rare as to be outweighed by the | |
249 | * benefits from the saved space. | |
250 | * | |
251 | * __wait_on_page_locked() and unlock_page() in mm/filemap.c, are the | |
252 | * primary users of these fields, and in mm/page_alloc.c | |
253 | * free_area_init_core() performs the initialization of them. | |
254 | */ | |
255 | wait_queue_head_t * wait_table; | |
02b694de | 256 | unsigned long wait_table_hash_nr_entries; |
1da177e4 LT |
257 | unsigned long wait_table_bits; |
258 | ||
259 | /* | |
260 | * Discontig memory support fields. | |
261 | */ | |
262 | struct pglist_data *zone_pgdat; | |
1da177e4 LT |
263 | /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ |
264 | unsigned long zone_start_pfn; | |
265 | ||
bdc8cb98 DH |
266 | /* |
267 | * zone_start_pfn, spanned_pages and present_pages are all | |
268 | * protected by span_seqlock. It is a seqlock because it has | |
269 | * to be read outside of zone->lock, and it is done in the main | |
270 | * allocator path. But, it is written quite infrequently. | |
271 | * | |
272 | * The lock is declared along with zone->lock because it is | |
273 | * frequently read in proximity to zone->lock. It's good to | |
274 | * give them a chance of being in the same cacheline. | |
275 | */ | |
1da177e4 LT |
276 | unsigned long spanned_pages; /* total size, including holes */ |
277 | unsigned long present_pages; /* amount of memory (excluding holes) */ | |
278 | ||
279 | /* | |
280 | * rarely used fields: | |
281 | */ | |
282 | char *name; | |
22fc6ecc | 283 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 284 | |
1da177e4 LT |
285 | /* |
286 | * The "priority" of VM scanning is how much of the queues we will scan in one | |
287 | * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the | |
288 | * queues ("queue_length >> 12") during an aging round. | |
289 | */ | |
290 | #define DEF_PRIORITY 12 | |
291 | ||
292 | /* | |
293 | * One allocation request operates on a zonelist. A zonelist | |
294 | * is a list of zones, the first one is the 'goal' of the | |
295 | * allocation, the other zones are fallback zones, in decreasing | |
296 | * priority. | |
297 | * | |
298 | * Right now a zonelist takes up less than a cacheline. We never | |
299 | * modify it apart from boot-up, and only a few indices are used, | |
300 | * so despite the zonelist table being relatively big, the cache | |
301 | * footprint of this construct is very small. | |
302 | */ | |
303 | struct zonelist { | |
304 | struct zone *zones[MAX_NUMNODES * MAX_NR_ZONES + 1]; // NULL delimited | |
305 | }; | |
306 | ||
307 | ||
308 | /* | |
309 | * The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM | |
310 | * (mostly NUMA machines?) to denote a higher-level memory zone than the | |
311 | * zone denotes. | |
312 | * | |
313 | * On NUMA machines, each NUMA node would have a pg_data_t to describe | |
314 | * it's memory layout. | |
315 | * | |
316 | * Memory statistics and page replacement data structures are maintained on a | |
317 | * per-zone basis. | |
318 | */ | |
319 | struct bootmem_data; | |
320 | typedef struct pglist_data { | |
321 | struct zone node_zones[MAX_NR_ZONES]; | |
19655d34 | 322 | struct zonelist node_zonelists[MAX_NR_ZONES]; |
1da177e4 | 323 | int nr_zones; |
d41dee36 | 324 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 | 325 | struct page *node_mem_map; |
d41dee36 | 326 | #endif |
1da177e4 | 327 | struct bootmem_data *bdata; |
208d54e5 DH |
328 | #ifdef CONFIG_MEMORY_HOTPLUG |
329 | /* | |
330 | * Must be held any time you expect node_start_pfn, node_present_pages | |
331 | * or node_spanned_pages stay constant. Holding this will also | |
332 | * guarantee that any pfn_valid() stays that way. | |
333 | * | |
334 | * Nests above zone->lock and zone->size_seqlock. | |
335 | */ | |
336 | spinlock_t node_size_lock; | |
337 | #endif | |
1da177e4 LT |
338 | unsigned long node_start_pfn; |
339 | unsigned long node_present_pages; /* total number of physical pages */ | |
340 | unsigned long node_spanned_pages; /* total size of physical page | |
341 | range, including holes */ | |
342 | int node_id; | |
1da177e4 LT |
343 | wait_queue_head_t kswapd_wait; |
344 | struct task_struct *kswapd; | |
345 | int kswapd_max_order; | |
346 | } pg_data_t; | |
347 | ||
348 | #define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages) | |
349 | #define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages) | |
d41dee36 | 350 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
408fde81 | 351 | #define pgdat_page_nr(pgdat, pagenr) ((pgdat)->node_mem_map + (pagenr)) |
d41dee36 AW |
352 | #else |
353 | #define pgdat_page_nr(pgdat, pagenr) pfn_to_page((pgdat)->node_start_pfn + (pagenr)) | |
354 | #endif | |
408fde81 | 355 | #define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr)) |
1da177e4 | 356 | |
208d54e5 DH |
357 | #include <linux/memory_hotplug.h> |
358 | ||
1da177e4 LT |
359 | void __get_zone_counts(unsigned long *active, unsigned long *inactive, |
360 | unsigned long *free, struct pglist_data *pgdat); | |
361 | void get_zone_counts(unsigned long *active, unsigned long *inactive, | |
362 | unsigned long *free); | |
363 | void build_all_zonelists(void); | |
364 | void wakeup_kswapd(struct zone *zone, int order); | |
365 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 366 | int classzone_idx, int alloc_flags); |
1da177e4 | 367 | |
718127cc YG |
368 | extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, |
369 | unsigned long size); | |
370 | ||
1da177e4 LT |
371 | #ifdef CONFIG_HAVE_MEMORY_PRESENT |
372 | void memory_present(int nid, unsigned long start, unsigned long end); | |
373 | #else | |
374 | static inline void memory_present(int nid, unsigned long start, unsigned long end) {} | |
375 | #endif | |
376 | ||
377 | #ifdef CONFIG_NEED_NODE_MEMMAP_SIZE | |
378 | unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); | |
379 | #endif | |
380 | ||
381 | /* | |
382 | * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc. | |
383 | */ | |
384 | #define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones) | |
385 | ||
f3fe6512 CK |
386 | static inline int populated_zone(struct zone *zone) |
387 | { | |
388 | return (!!zone->present_pages); | |
389 | } | |
390 | ||
2f1b6248 | 391 | static inline int is_highmem_idx(enum zone_type idx) |
1da177e4 | 392 | { |
e53ef38d | 393 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 394 | return (idx == ZONE_HIGHMEM); |
e53ef38d CL |
395 | #else |
396 | return 0; | |
397 | #endif | |
1da177e4 LT |
398 | } |
399 | ||
2f1b6248 | 400 | static inline int is_normal_idx(enum zone_type idx) |
1da177e4 LT |
401 | { |
402 | return (idx == ZONE_NORMAL); | |
403 | } | |
9328b8fa | 404 | |
1da177e4 LT |
405 | /** |
406 | * is_highmem - helper function to quickly check if a struct zone is a | |
407 | * highmem zone or not. This is an attempt to keep references | |
408 | * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. | |
409 | * @zone - pointer to struct zone variable | |
410 | */ | |
411 | static inline int is_highmem(struct zone *zone) | |
412 | { | |
e53ef38d | 413 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 414 | return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM; |
e53ef38d CL |
415 | #else |
416 | return 0; | |
417 | #endif | |
1da177e4 LT |
418 | } |
419 | ||
420 | static inline int is_normal(struct zone *zone) | |
421 | { | |
422 | return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL; | |
423 | } | |
424 | ||
9328b8fa NP |
425 | static inline int is_dma32(struct zone *zone) |
426 | { | |
fb0e7942 | 427 | #ifdef CONFIG_ZONE_DMA32 |
9328b8fa | 428 | return zone == zone->zone_pgdat->node_zones + ZONE_DMA32; |
fb0e7942 CL |
429 | #else |
430 | return 0; | |
431 | #endif | |
9328b8fa NP |
432 | } |
433 | ||
434 | static inline int is_dma(struct zone *zone) | |
435 | { | |
436 | return zone == zone->zone_pgdat->node_zones + ZONE_DMA; | |
437 | } | |
438 | ||
1da177e4 LT |
439 | /* These two functions are used to setup the per zone pages min values */ |
440 | struct ctl_table; | |
441 | struct file; | |
442 | int min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *, | |
443 | void __user *, size_t *, loff_t *); | |
444 | extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1]; | |
445 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, struct file *, | |
446 | void __user *, size_t *, loff_t *); | |
8ad4b1fb RS |
447 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *, int, struct file *, |
448 | void __user *, size_t *, loff_t *); | |
9614634f CL |
449 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *, int, |
450 | struct file *, void __user *, size_t *, loff_t *); | |
1da177e4 LT |
451 | |
452 | #include <linux/topology.h> | |
453 | /* Returns the number of the current Node. */ | |
69d81fcd | 454 | #ifndef numa_node_id |
39c715b7 | 455 | #define numa_node_id() (cpu_to_node(raw_smp_processor_id())) |
69d81fcd | 456 | #endif |
1da177e4 | 457 | |
93b7504e | 458 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
459 | |
460 | extern struct pglist_data contig_page_data; | |
461 | #define NODE_DATA(nid) (&contig_page_data) | |
462 | #define NODE_MEM_MAP(nid) mem_map | |
463 | #define MAX_NODES_SHIFT 1 | |
1da177e4 | 464 | |
93b7504e | 465 | #else /* CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
466 | |
467 | #include <asm/mmzone.h> | |
468 | ||
93b7504e | 469 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
348f8b6c | 470 | |
95144c78 KH |
471 | extern struct pglist_data *first_online_pgdat(void); |
472 | extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat); | |
473 | extern struct zone *next_zone(struct zone *zone); | |
8357f869 KH |
474 | |
475 | /** | |
476 | * for_each_pgdat - helper macro to iterate over all nodes | |
477 | * @pgdat - pointer to a pg_data_t variable | |
478 | */ | |
479 | #define for_each_online_pgdat(pgdat) \ | |
480 | for (pgdat = first_online_pgdat(); \ | |
481 | pgdat; \ | |
482 | pgdat = next_online_pgdat(pgdat)) | |
8357f869 KH |
483 | /** |
484 | * for_each_zone - helper macro to iterate over all memory zones | |
485 | * @zone - pointer to struct zone variable | |
486 | * | |
487 | * The user only needs to declare the zone variable, for_each_zone | |
488 | * fills it in. | |
489 | */ | |
490 | #define for_each_zone(zone) \ | |
491 | for (zone = (first_online_pgdat())->node_zones; \ | |
492 | zone; \ | |
493 | zone = next_zone(zone)) | |
494 | ||
d41dee36 AW |
495 | #ifdef CONFIG_SPARSEMEM |
496 | #include <asm/sparsemem.h> | |
497 | #endif | |
498 | ||
07808b74 | 499 | #if BITS_PER_LONG == 32 |
1da177e4 | 500 | /* |
a2f1b424 AK |
501 | * with 32 bit page->flags field, we reserve 9 bits for node/zone info. |
502 | * there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes. | |
1da177e4 | 503 | */ |
a2f1b424 | 504 | #define FLAGS_RESERVED 9 |
348f8b6c | 505 | |
1da177e4 LT |
506 | #elif BITS_PER_LONG == 64 |
507 | /* | |
508 | * with 64 bit flags field, there's plenty of room. | |
509 | */ | |
348f8b6c | 510 | #define FLAGS_RESERVED 32 |
1da177e4 | 511 | |
348f8b6c | 512 | #else |
1da177e4 | 513 | |
348f8b6c | 514 | #error BITS_PER_LONG not defined |
1da177e4 | 515 | |
1da177e4 LT |
516 | #endif |
517 | ||
b159d43f AW |
518 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
519 | #define early_pfn_to_nid(nid) (0UL) | |
520 | #endif | |
521 | ||
2bdaf115 AW |
522 | #ifdef CONFIG_FLATMEM |
523 | #define pfn_to_nid(pfn) (0) | |
524 | #endif | |
525 | ||
d41dee36 AW |
526 | #define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT) |
527 | #define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT) | |
528 | ||
529 | #ifdef CONFIG_SPARSEMEM | |
530 | ||
531 | /* | |
532 | * SECTION_SHIFT #bits space required to store a section # | |
533 | * | |
534 | * PA_SECTION_SHIFT physical address to/from section number | |
535 | * PFN_SECTION_SHIFT pfn to/from section number | |
536 | */ | |
537 | #define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS) | |
538 | ||
539 | #define PA_SECTION_SHIFT (SECTION_SIZE_BITS) | |
540 | #define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT) | |
541 | ||
542 | #define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT) | |
543 | ||
544 | #define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT) | |
545 | #define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) | |
546 | ||
547 | #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS | |
548 | #error Allocator MAX_ORDER exceeds SECTION_SIZE | |
549 | #endif | |
550 | ||
551 | struct page; | |
552 | struct mem_section { | |
29751f69 AW |
553 | /* |
554 | * This is, logically, a pointer to an array of struct | |
555 | * pages. However, it is stored with some other magic. | |
556 | * (see sparse.c::sparse_init_one_section()) | |
557 | * | |
30c253e6 AW |
558 | * Additionally during early boot we encode node id of |
559 | * the location of the section here to guide allocation. | |
560 | * (see sparse.c::memory_present()) | |
561 | * | |
29751f69 AW |
562 | * Making it a UL at least makes someone do a cast |
563 | * before using it wrong. | |
564 | */ | |
565 | unsigned long section_mem_map; | |
d41dee36 AW |
566 | }; |
567 | ||
3e347261 BP |
568 | #ifdef CONFIG_SPARSEMEM_EXTREME |
569 | #define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) | |
570 | #else | |
571 | #define SECTIONS_PER_ROOT 1 | |
572 | #endif | |
802f192e | 573 | |
3e347261 BP |
574 | #define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) |
575 | #define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT) | |
576 | #define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) | |
802f192e | 577 | |
3e347261 BP |
578 | #ifdef CONFIG_SPARSEMEM_EXTREME |
579 | extern struct mem_section *mem_section[NR_SECTION_ROOTS]; | |
802f192e | 580 | #else |
3e347261 BP |
581 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; |
582 | #endif | |
d41dee36 | 583 | |
29751f69 AW |
584 | static inline struct mem_section *__nr_to_section(unsigned long nr) |
585 | { | |
3e347261 BP |
586 | if (!mem_section[SECTION_NR_TO_ROOT(nr)]) |
587 | return NULL; | |
588 | return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK]; | |
29751f69 | 589 | } |
4ca644d9 | 590 | extern int __section_nr(struct mem_section* ms); |
29751f69 AW |
591 | |
592 | /* | |
593 | * We use the lower bits of the mem_map pointer to store | |
594 | * a little bit of information. There should be at least | |
595 | * 3 bits here due to 32-bit alignment. | |
596 | */ | |
597 | #define SECTION_MARKED_PRESENT (1UL<<0) | |
598 | #define SECTION_HAS_MEM_MAP (1UL<<1) | |
599 | #define SECTION_MAP_LAST_BIT (1UL<<2) | |
600 | #define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1)) | |
30c253e6 | 601 | #define SECTION_NID_SHIFT 2 |
29751f69 AW |
602 | |
603 | static inline struct page *__section_mem_map_addr(struct mem_section *section) | |
604 | { | |
605 | unsigned long map = section->section_mem_map; | |
606 | map &= SECTION_MAP_MASK; | |
607 | return (struct page *)map; | |
608 | } | |
609 | ||
610 | static inline int valid_section(struct mem_section *section) | |
611 | { | |
802f192e | 612 | return (section && (section->section_mem_map & SECTION_MARKED_PRESENT)); |
29751f69 AW |
613 | } |
614 | ||
615 | static inline int section_has_mem_map(struct mem_section *section) | |
616 | { | |
802f192e | 617 | return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP)); |
29751f69 AW |
618 | } |
619 | ||
620 | static inline int valid_section_nr(unsigned long nr) | |
621 | { | |
622 | return valid_section(__nr_to_section(nr)); | |
623 | } | |
624 | ||
d41dee36 AW |
625 | static inline struct mem_section *__pfn_to_section(unsigned long pfn) |
626 | { | |
29751f69 | 627 | return __nr_to_section(pfn_to_section_nr(pfn)); |
d41dee36 AW |
628 | } |
629 | ||
d41dee36 AW |
630 | static inline int pfn_valid(unsigned long pfn) |
631 | { | |
632 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) | |
633 | return 0; | |
29751f69 | 634 | return valid_section(__nr_to_section(pfn_to_section_nr(pfn))); |
d41dee36 AW |
635 | } |
636 | ||
637 | /* | |
638 | * These are _only_ used during initialisation, therefore they | |
639 | * can use __initdata ... They could have names to indicate | |
640 | * this restriction. | |
641 | */ | |
642 | #ifdef CONFIG_NUMA | |
161599ff AW |
643 | #define pfn_to_nid(pfn) \ |
644 | ({ \ | |
645 | unsigned long __pfn_to_nid_pfn = (pfn); \ | |
646 | page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \ | |
647 | }) | |
2bdaf115 AW |
648 | #else |
649 | #define pfn_to_nid(pfn) (0) | |
d41dee36 AW |
650 | #endif |
651 | ||
d41dee36 AW |
652 | #define early_pfn_valid(pfn) pfn_valid(pfn) |
653 | void sparse_init(void); | |
654 | #else | |
655 | #define sparse_init() do {} while (0) | |
28ae55c9 | 656 | #define sparse_index_init(_sec, _nid) do {} while (0) |
d41dee36 AW |
657 | #endif /* CONFIG_SPARSEMEM */ |
658 | ||
659 | #ifndef early_pfn_valid | |
660 | #define early_pfn_valid(pfn) (1) | |
661 | #endif | |
662 | ||
663 | void memory_present(int nid, unsigned long start, unsigned long end); | |
664 | unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); | |
665 | ||
1da177e4 LT |
666 | #endif /* !__ASSEMBLY__ */ |
667 | #endif /* __KERNEL__ */ | |
668 | #endif /* _LINUX_MMZONE_H */ |