Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/mm/swap.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* | |
183ff22b | 8 | * This file contains the default values for the operation of the |
1da177e4 LT |
9 | * Linux VM subsystem. Fine-tuning documentation can be found in |
10 | * Documentation/sysctl/vm.txt. | |
11 | * Started 18.12.91 | |
12 | * Swap aging added 23.2.95, Stephen Tweedie. | |
13 | * Buffermem limits added 12.3.98, Rik van Riel. | |
14 | */ | |
15 | ||
16 | #include <linux/mm.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/kernel_stat.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/pagevec.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/mm_inline.h> | |
26 | #include <linux/buffer_head.h> /* for try_to_release_page() */ | |
1da177e4 LT |
27 | #include <linux/percpu_counter.h> |
28 | #include <linux/percpu.h> | |
29 | #include <linux/cpu.h> | |
30 | #include <linux/notifier.h> | |
e0bf68dd | 31 | #include <linux/backing-dev.h> |
66e1707b | 32 | #include <linux/memcontrol.h> |
1da177e4 LT |
33 | |
34 | /* How many pages do we try to swap or page in/out together? */ | |
35 | int page_cluster; | |
36 | ||
902aaed0 HH |
37 | static DEFINE_PER_CPU(struct pagevec, lru_add_pvecs) = { 0, }; |
38 | static DEFINE_PER_CPU(struct pagevec, lru_add_active_pvecs) = { 0, }; | |
39 | static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs) = { 0, }; | |
40 | ||
b221385b AB |
41 | /* |
42 | * This path almost never happens for VM activity - pages are normally | |
43 | * freed via pagevecs. But it gets used by networking. | |
44 | */ | |
920c7a5d | 45 | static void __page_cache_release(struct page *page) |
b221385b AB |
46 | { |
47 | if (PageLRU(page)) { | |
48 | unsigned long flags; | |
49 | struct zone *zone = page_zone(page); | |
50 | ||
51 | spin_lock_irqsave(&zone->lru_lock, flags); | |
52 | VM_BUG_ON(!PageLRU(page)); | |
53 | __ClearPageLRU(page); | |
54 | del_page_from_lru(zone, page); | |
55 | spin_unlock_irqrestore(&zone->lru_lock, flags); | |
56 | } | |
57 | free_hot_page(page); | |
58 | } | |
59 | ||
8519fb30 | 60 | static void put_compound_page(struct page *page) |
1da177e4 | 61 | { |
d85f3385 | 62 | page = compound_head(page); |
8519fb30 | 63 | if (put_page_testzero(page)) { |
33f2ef89 | 64 | compound_page_dtor *dtor; |
1da177e4 | 65 | |
33f2ef89 | 66 | dtor = get_compound_page_dtor(page); |
8519fb30 | 67 | (*dtor)(page); |
1da177e4 | 68 | } |
8519fb30 NP |
69 | } |
70 | ||
71 | void put_page(struct page *page) | |
72 | { | |
73 | if (unlikely(PageCompound(page))) | |
74 | put_compound_page(page); | |
75 | else if (put_page_testzero(page)) | |
1da177e4 LT |
76 | __page_cache_release(page); |
77 | } | |
78 | EXPORT_SYMBOL(put_page); | |
1da177e4 | 79 | |
1d7ea732 AZ |
80 | /** |
81 | * put_pages_list(): release a list of pages | |
82 | * | |
83 | * Release a list of pages which are strung together on page.lru. Currently | |
84 | * used by read_cache_pages() and related error recovery code. | |
85 | * | |
86 | * @pages: list of pages threaded on page->lru | |
87 | */ | |
88 | void put_pages_list(struct list_head *pages) | |
89 | { | |
90 | while (!list_empty(pages)) { | |
91 | struct page *victim; | |
92 | ||
93 | victim = list_entry(pages->prev, struct page, lru); | |
94 | list_del(&victim->lru); | |
95 | page_cache_release(victim); | |
96 | } | |
97 | } | |
98 | EXPORT_SYMBOL(put_pages_list); | |
99 | ||
902aaed0 HH |
100 | /* |
101 | * pagevec_move_tail() must be called with IRQ disabled. | |
102 | * Otherwise this may cause nasty races. | |
103 | */ | |
104 | static void pagevec_move_tail(struct pagevec *pvec) | |
105 | { | |
106 | int i; | |
107 | int pgmoved = 0; | |
108 | struct zone *zone = NULL; | |
109 | ||
110 | for (i = 0; i < pagevec_count(pvec); i++) { | |
111 | struct page *page = pvec->pages[i]; | |
112 | struct zone *pagezone = page_zone(page); | |
113 | ||
114 | if (pagezone != zone) { | |
115 | if (zone) | |
116 | spin_unlock(&zone->lru_lock); | |
117 | zone = pagezone; | |
118 | spin_lock(&zone->lru_lock); | |
119 | } | |
120 | if (PageLRU(page) && !PageActive(page)) { | |
121 | list_move_tail(&page->lru, &zone->inactive_list); | |
122 | pgmoved++; | |
123 | } | |
124 | } | |
125 | if (zone) | |
126 | spin_unlock(&zone->lru_lock); | |
127 | __count_vm_events(PGROTATED, pgmoved); | |
128 | release_pages(pvec->pages, pvec->nr, pvec->cold); | |
129 | pagevec_reinit(pvec); | |
130 | } | |
131 | ||
1da177e4 LT |
132 | /* |
133 | * Writeback is about to end against a page which has been marked for immediate | |
134 | * reclaim. If it still appears to be reclaimable, move it to the tail of the | |
902aaed0 | 135 | * inactive list. |
1da177e4 LT |
136 | * |
137 | * Returns zero if it cleared PG_writeback. | |
138 | */ | |
139 | int rotate_reclaimable_page(struct page *page) | |
140 | { | |
902aaed0 | 141 | struct pagevec *pvec; |
1da177e4 LT |
142 | unsigned long flags; |
143 | ||
144 | if (PageLocked(page)) | |
145 | return 1; | |
146 | if (PageDirty(page)) | |
147 | return 1; | |
148 | if (PageActive(page)) | |
149 | return 1; | |
150 | if (!PageLRU(page)) | |
151 | return 1; | |
152 | ||
902aaed0 HH |
153 | page_cache_get(page); |
154 | local_irq_save(flags); | |
155 | pvec = &__get_cpu_var(lru_rotate_pvecs); | |
156 | if (!pagevec_add(pvec, page)) | |
157 | pagevec_move_tail(pvec); | |
158 | local_irq_restore(flags); | |
159 | ||
1da177e4 LT |
160 | if (!test_clear_page_writeback(page)) |
161 | BUG(); | |
902aaed0 | 162 | |
1da177e4 LT |
163 | return 0; |
164 | } | |
165 | ||
166 | /* | |
167 | * FIXME: speed this up? | |
168 | */ | |
920c7a5d | 169 | void activate_page(struct page *page) |
1da177e4 LT |
170 | { |
171 | struct zone *zone = page_zone(page); | |
172 | ||
173 | spin_lock_irq(&zone->lru_lock); | |
174 | if (PageLRU(page) && !PageActive(page)) { | |
175 | del_page_from_inactive_list(zone, page); | |
176 | SetPageActive(page); | |
177 | add_page_to_active_list(zone, page); | |
f8891e5e | 178 | __count_vm_event(PGACTIVATE); |
66e1707b | 179 | mem_cgroup_move_lists(page_get_page_cgroup(page), true); |
1da177e4 LT |
180 | } |
181 | spin_unlock_irq(&zone->lru_lock); | |
182 | } | |
183 | ||
184 | /* | |
185 | * Mark a page as having seen activity. | |
186 | * | |
187 | * inactive,unreferenced -> inactive,referenced | |
188 | * inactive,referenced -> active,unreferenced | |
189 | * active,unreferenced -> active,referenced | |
190 | */ | |
920c7a5d | 191 | void mark_page_accessed(struct page *page) |
1da177e4 LT |
192 | { |
193 | if (!PageActive(page) && PageReferenced(page) && PageLRU(page)) { | |
194 | activate_page(page); | |
195 | ClearPageReferenced(page); | |
196 | } else if (!PageReferenced(page)) { | |
197 | SetPageReferenced(page); | |
198 | } | |
199 | } | |
200 | ||
201 | EXPORT_SYMBOL(mark_page_accessed); | |
202 | ||
203 | /** | |
204 | * lru_cache_add: add a page to the page lists | |
205 | * @page: the page to add | |
206 | */ | |
920c7a5d | 207 | void lru_cache_add(struct page *page) |
1da177e4 LT |
208 | { |
209 | struct pagevec *pvec = &get_cpu_var(lru_add_pvecs); | |
210 | ||
211 | page_cache_get(page); | |
212 | if (!pagevec_add(pvec, page)) | |
213 | __pagevec_lru_add(pvec); | |
214 | put_cpu_var(lru_add_pvecs); | |
215 | } | |
216 | ||
920c7a5d | 217 | void lru_cache_add_active(struct page *page) |
1da177e4 LT |
218 | { |
219 | struct pagevec *pvec = &get_cpu_var(lru_add_active_pvecs); | |
220 | ||
221 | page_cache_get(page); | |
222 | if (!pagevec_add(pvec, page)) | |
223 | __pagevec_lru_add_active(pvec); | |
224 | put_cpu_var(lru_add_active_pvecs); | |
225 | } | |
226 | ||
902aaed0 HH |
227 | /* |
228 | * Drain pages out of the cpu's pagevecs. | |
229 | * Either "cpu" is the current CPU, and preemption has already been | |
230 | * disabled; or "cpu" is being hot-unplugged, and is already dead. | |
231 | */ | |
232 | static void drain_cpu_pagevecs(int cpu) | |
1da177e4 | 233 | { |
902aaed0 | 234 | struct pagevec *pvec; |
1da177e4 | 235 | |
902aaed0 | 236 | pvec = &per_cpu(lru_add_pvecs, cpu); |
1da177e4 LT |
237 | if (pagevec_count(pvec)) |
238 | __pagevec_lru_add(pvec); | |
902aaed0 | 239 | |
80bfed90 | 240 | pvec = &per_cpu(lru_add_active_pvecs, cpu); |
1da177e4 LT |
241 | if (pagevec_count(pvec)) |
242 | __pagevec_lru_add_active(pvec); | |
902aaed0 HH |
243 | |
244 | pvec = &per_cpu(lru_rotate_pvecs, cpu); | |
245 | if (pagevec_count(pvec)) { | |
246 | unsigned long flags; | |
247 | ||
248 | /* No harm done if a racing interrupt already did this */ | |
249 | local_irq_save(flags); | |
250 | pagevec_move_tail(pvec); | |
251 | local_irq_restore(flags); | |
252 | } | |
80bfed90 AM |
253 | } |
254 | ||
255 | void lru_add_drain(void) | |
256 | { | |
902aaed0 | 257 | drain_cpu_pagevecs(get_cpu()); |
80bfed90 | 258 | put_cpu(); |
1da177e4 LT |
259 | } |
260 | ||
053837fc | 261 | #ifdef CONFIG_NUMA |
c4028958 | 262 | static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fc NP |
263 | { |
264 | lru_add_drain(); | |
265 | } | |
266 | ||
267 | /* | |
268 | * Returns 0 for success | |
269 | */ | |
270 | int lru_add_drain_all(void) | |
271 | { | |
c4028958 | 272 | return schedule_on_each_cpu(lru_add_drain_per_cpu); |
053837fc NP |
273 | } |
274 | ||
275 | #else | |
276 | ||
277 | /* | |
278 | * Returns 0 for success | |
279 | */ | |
280 | int lru_add_drain_all(void) | |
281 | { | |
282 | lru_add_drain(); | |
283 | return 0; | |
284 | } | |
285 | #endif | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * Batched page_cache_release(). Decrement the reference count on all the | |
289 | * passed pages. If it fell to zero then remove the page from the LRU and | |
290 | * free it. | |
291 | * | |
292 | * Avoid taking zone->lru_lock if possible, but if it is taken, retain it | |
293 | * for the remainder of the operation. | |
294 | * | |
295 | * The locking in this function is against shrink_cache(): we recheck the | |
296 | * page count inside the lock to see whether shrink_cache grabbed the page | |
297 | * via the LRU. If it did, give up: shrink_cache will free it. | |
298 | */ | |
299 | void release_pages(struct page **pages, int nr, int cold) | |
300 | { | |
301 | int i; | |
302 | struct pagevec pages_to_free; | |
303 | struct zone *zone = NULL; | |
902aaed0 | 304 | unsigned long uninitialized_var(flags); |
1da177e4 LT |
305 | |
306 | pagevec_init(&pages_to_free, cold); | |
307 | for (i = 0; i < nr; i++) { | |
308 | struct page *page = pages[i]; | |
1da177e4 | 309 | |
8519fb30 NP |
310 | if (unlikely(PageCompound(page))) { |
311 | if (zone) { | |
902aaed0 | 312 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
8519fb30 NP |
313 | zone = NULL; |
314 | } | |
315 | put_compound_page(page); | |
316 | continue; | |
317 | } | |
318 | ||
b5810039 | 319 | if (!put_page_testzero(page)) |
1da177e4 LT |
320 | continue; |
321 | ||
46453a6e NP |
322 | if (PageLRU(page)) { |
323 | struct zone *pagezone = page_zone(page); | |
324 | if (pagezone != zone) { | |
325 | if (zone) | |
902aaed0 HH |
326 | spin_unlock_irqrestore(&zone->lru_lock, |
327 | flags); | |
46453a6e | 328 | zone = pagezone; |
902aaed0 | 329 | spin_lock_irqsave(&zone->lru_lock, flags); |
46453a6e | 330 | } |
725d704e | 331 | VM_BUG_ON(!PageLRU(page)); |
67453911 | 332 | __ClearPageLRU(page); |
1da177e4 | 333 | del_page_from_lru(zone, page); |
46453a6e NP |
334 | } |
335 | ||
336 | if (!pagevec_add(&pages_to_free, page)) { | |
337 | if (zone) { | |
902aaed0 | 338 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
46453a6e | 339 | zone = NULL; |
1da177e4 | 340 | } |
46453a6e NP |
341 | __pagevec_free(&pages_to_free); |
342 | pagevec_reinit(&pages_to_free); | |
343 | } | |
1da177e4 LT |
344 | } |
345 | if (zone) | |
902aaed0 | 346 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
1da177e4 LT |
347 | |
348 | pagevec_free(&pages_to_free); | |
349 | } | |
350 | ||
351 | /* | |
352 | * The pages which we're about to release may be in the deferred lru-addition | |
353 | * queues. That would prevent them from really being freed right now. That's | |
354 | * OK from a correctness point of view but is inefficient - those pages may be | |
355 | * cache-warm and we want to give them back to the page allocator ASAP. | |
356 | * | |
357 | * So __pagevec_release() will drain those queues here. __pagevec_lru_add() | |
358 | * and __pagevec_lru_add_active() call release_pages() directly to avoid | |
359 | * mutual recursion. | |
360 | */ | |
361 | void __pagevec_release(struct pagevec *pvec) | |
362 | { | |
363 | lru_add_drain(); | |
364 | release_pages(pvec->pages, pagevec_count(pvec), pvec->cold); | |
365 | pagevec_reinit(pvec); | |
366 | } | |
367 | ||
7f285701 SF |
368 | EXPORT_SYMBOL(__pagevec_release); |
369 | ||
1da177e4 LT |
370 | /* |
371 | * pagevec_release() for pages which are known to not be on the LRU | |
372 | * | |
373 | * This function reinitialises the caller's pagevec. | |
374 | */ | |
375 | void __pagevec_release_nonlru(struct pagevec *pvec) | |
376 | { | |
377 | int i; | |
378 | struct pagevec pages_to_free; | |
379 | ||
380 | pagevec_init(&pages_to_free, pvec->cold); | |
1da177e4 LT |
381 | for (i = 0; i < pagevec_count(pvec); i++) { |
382 | struct page *page = pvec->pages[i]; | |
383 | ||
725d704e | 384 | VM_BUG_ON(PageLRU(page)); |
1da177e4 LT |
385 | if (put_page_testzero(page)) |
386 | pagevec_add(&pages_to_free, page); | |
387 | } | |
388 | pagevec_free(&pages_to_free); | |
389 | pagevec_reinit(pvec); | |
390 | } | |
391 | ||
392 | /* | |
393 | * Add the passed pages to the LRU, then drop the caller's refcount | |
394 | * on them. Reinitialises the caller's pagevec. | |
395 | */ | |
396 | void __pagevec_lru_add(struct pagevec *pvec) | |
397 | { | |
398 | int i; | |
399 | struct zone *zone = NULL; | |
400 | ||
401 | for (i = 0; i < pagevec_count(pvec); i++) { | |
402 | struct page *page = pvec->pages[i]; | |
403 | struct zone *pagezone = page_zone(page); | |
404 | ||
405 | if (pagezone != zone) { | |
406 | if (zone) | |
407 | spin_unlock_irq(&zone->lru_lock); | |
408 | zone = pagezone; | |
409 | spin_lock_irq(&zone->lru_lock); | |
410 | } | |
725d704e | 411 | VM_BUG_ON(PageLRU(page)); |
8d438f96 | 412 | SetPageLRU(page); |
1da177e4 LT |
413 | add_page_to_inactive_list(zone, page); |
414 | } | |
415 | if (zone) | |
416 | spin_unlock_irq(&zone->lru_lock); | |
417 | release_pages(pvec->pages, pvec->nr, pvec->cold); | |
418 | pagevec_reinit(pvec); | |
419 | } | |
420 | ||
421 | EXPORT_SYMBOL(__pagevec_lru_add); | |
422 | ||
423 | void __pagevec_lru_add_active(struct pagevec *pvec) | |
424 | { | |
425 | int i; | |
426 | struct zone *zone = NULL; | |
427 | ||
428 | for (i = 0; i < pagevec_count(pvec); i++) { | |
429 | struct page *page = pvec->pages[i]; | |
430 | struct zone *pagezone = page_zone(page); | |
431 | ||
432 | if (pagezone != zone) { | |
433 | if (zone) | |
434 | spin_unlock_irq(&zone->lru_lock); | |
435 | zone = pagezone; | |
436 | spin_lock_irq(&zone->lru_lock); | |
437 | } | |
725d704e | 438 | VM_BUG_ON(PageLRU(page)); |
8d438f96 | 439 | SetPageLRU(page); |
725d704e | 440 | VM_BUG_ON(PageActive(page)); |
4c84cacf | 441 | SetPageActive(page); |
1da177e4 LT |
442 | add_page_to_active_list(zone, page); |
443 | } | |
444 | if (zone) | |
445 | spin_unlock_irq(&zone->lru_lock); | |
446 | release_pages(pvec->pages, pvec->nr, pvec->cold); | |
447 | pagevec_reinit(pvec); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Try to drop buffers from the pages in a pagevec | |
452 | */ | |
453 | void pagevec_strip(struct pagevec *pvec) | |
454 | { | |
455 | int i; | |
456 | ||
457 | for (i = 0; i < pagevec_count(pvec); i++) { | |
458 | struct page *page = pvec->pages[i]; | |
459 | ||
460 | if (PagePrivate(page) && !TestSetPageLocked(page)) { | |
5b40dc78 CL |
461 | if (PagePrivate(page)) |
462 | try_to_release_page(page, 0); | |
1da177e4 LT |
463 | unlock_page(page); |
464 | } | |
465 | } | |
466 | } | |
467 | ||
468 | /** | |
469 | * pagevec_lookup - gang pagecache lookup | |
470 | * @pvec: Where the resulting pages are placed | |
471 | * @mapping: The address_space to search | |
472 | * @start: The starting page index | |
473 | * @nr_pages: The maximum number of pages | |
474 | * | |
475 | * pagevec_lookup() will search for and return a group of up to @nr_pages pages | |
476 | * in the mapping. The pages are placed in @pvec. pagevec_lookup() takes a | |
477 | * reference against the pages in @pvec. | |
478 | * | |
479 | * The search returns a group of mapping-contiguous pages with ascending | |
480 | * indexes. There may be holes in the indices due to not-present pages. | |
481 | * | |
482 | * pagevec_lookup() returns the number of pages which were found. | |
483 | */ | |
484 | unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, | |
485 | pgoff_t start, unsigned nr_pages) | |
486 | { | |
487 | pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages); | |
488 | return pagevec_count(pvec); | |
489 | } | |
490 | ||
78539fdf CH |
491 | EXPORT_SYMBOL(pagevec_lookup); |
492 | ||
1da177e4 LT |
493 | unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping, |
494 | pgoff_t *index, int tag, unsigned nr_pages) | |
495 | { | |
496 | pvec->nr = find_get_pages_tag(mapping, index, tag, | |
497 | nr_pages, pvec->pages); | |
498 | return pagevec_count(pvec); | |
499 | } | |
500 | ||
7f285701 | 501 | EXPORT_SYMBOL(pagevec_lookup_tag); |
1da177e4 LT |
502 | |
503 | #ifdef CONFIG_SMP | |
504 | /* | |
505 | * We tolerate a little inaccuracy to avoid ping-ponging the counter between | |
506 | * CPUs | |
507 | */ | |
508 | #define ACCT_THRESHOLD max(16, NR_CPUS * 2) | |
509 | ||
510 | static DEFINE_PER_CPU(long, committed_space) = 0; | |
511 | ||
512 | void vm_acct_memory(long pages) | |
513 | { | |
514 | long *local; | |
515 | ||
516 | preempt_disable(); | |
517 | local = &__get_cpu_var(committed_space); | |
518 | *local += pages; | |
519 | if (*local > ACCT_THRESHOLD || *local < -ACCT_THRESHOLD) { | |
520 | atomic_add(*local, &vm_committed_space); | |
521 | *local = 0; | |
522 | } | |
523 | preempt_enable(); | |
524 | } | |
1da177e4 LT |
525 | |
526 | #ifdef CONFIG_HOTPLUG_CPU | |
1da177e4 LT |
527 | |
528 | /* Drop the CPU's cached committed space back into the central pool. */ | |
529 | static int cpu_swap_callback(struct notifier_block *nfb, | |
530 | unsigned long action, | |
531 | void *hcpu) | |
532 | { | |
533 | long *committed; | |
534 | ||
535 | committed = &per_cpu(committed_space, (long)hcpu); | |
8bb78442 | 536 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
1da177e4 LT |
537 | atomic_add(*committed, &vm_committed_space); |
538 | *committed = 0; | |
902aaed0 | 539 | drain_cpu_pagevecs((long)hcpu); |
1da177e4 LT |
540 | } |
541 | return NOTIFY_OK; | |
542 | } | |
543 | #endif /* CONFIG_HOTPLUG_CPU */ | |
544 | #endif /* CONFIG_SMP */ | |
545 | ||
1da177e4 LT |
546 | /* |
547 | * Perform any setup for the swap system | |
548 | */ | |
549 | void __init swap_setup(void) | |
550 | { | |
551 | unsigned long megs = num_physpages >> (20 - PAGE_SHIFT); | |
552 | ||
e0bf68dd PZ |
553 | #ifdef CONFIG_SWAP |
554 | bdi_init(swapper_space.backing_dev_info); | |
555 | #endif | |
556 | ||
1da177e4 LT |
557 | /* Use a smaller cluster for small-memory machines */ |
558 | if (megs < 16) | |
559 | page_cluster = 2; | |
560 | else | |
561 | page_cluster = 3; | |
562 | /* | |
563 | * Right now other parts of the system means that we | |
564 | * _really_ don't want to cluster much more | |
565 | */ | |
02316067 | 566 | #ifdef CONFIG_HOTPLUG_CPU |
1da177e4 | 567 | hotcpu_notifier(cpu_swap_callback, 0); |
02316067 | 568 | #endif |
1da177e4 | 569 | } |