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17#include <linux/mm.h>
18#include <linux/sched.h>
19#include <linux/kernel_stat.h>
20#include <linux/swap.h>
21#include <linux/mman.h>
22#include <linux/pagemap.h>
23#include <linux/pagevec.h>
24#include <linux/init.h>
25#include <linux/export.h>
26#include <linux/mm_inline.h>
27#include <linux/percpu_counter.h>
28#include <linux/memremap.h>
29#include <linux/percpu.h>
30#include <linux/cpu.h>
31#include <linux/notifier.h>
32#include <linux/backing-dev.h>
33#include <linux/memcontrol.h>
34#include <linux/gfp.h>
35#include <linux/uio.h>
36#include <linux/hugetlb.h>
37#include <linux/page_idle.h>
38#include <linux/local_lock.h>
39#include <linux/buffer_head.h>
40
41#include "internal.h"
42
43#define CREATE_TRACE_POINTS
44#include <trace/events/pagemap.h>
45
46
47int page_cluster;
48
49
50struct lru_rotate {
51 local_lock_t lock;
52 struct pagevec pvec;
53};
54static DEFINE_PER_CPU(struct lru_rotate, lru_rotate) = {
55 .lock = INIT_LOCAL_LOCK(lock),
56};
57
58
59
60
61
62struct lru_pvecs {
63 local_lock_t lock;
64 struct pagevec lru_add;
65 struct pagevec lru_deactivate_file;
66 struct pagevec lru_deactivate;
67 struct pagevec lru_lazyfree;
68#ifdef CONFIG_SMP
69 struct pagevec activate_page;
70#endif
71};
72static DEFINE_PER_CPU(struct lru_pvecs, lru_pvecs) = {
73 .lock = INIT_LOCAL_LOCK(lock),
74};
75
76
77
78
79
80static void __page_cache_release(struct page *page)
81{
82 if (PageLRU(page)) {
83 struct lruvec *lruvec;
84 unsigned long flags;
85
86 lruvec = lock_page_lruvec_irqsave(page, &flags);
87 del_page_from_lru_list(page, lruvec);
88 __clear_page_lru_flags(page);
89 unlock_page_lruvec_irqrestore(lruvec, flags);
90 }
91 __ClearPageWaiters(page);
92}
93
94static void __put_single_page(struct page *page)
95{
96 __page_cache_release(page);
97 mem_cgroup_uncharge(page);
98 free_unref_page(page, 0);
99}
100
101static void __put_compound_page(struct page *page)
102{
103
104
105
106
107
108
109 if (!PageHuge(page))
110 __page_cache_release(page);
111 destroy_compound_page(page);
112}
113
114void __put_page(struct page *page)
115{
116 if (is_zone_device_page(page)) {
117 put_dev_pagemap(page->pgmap);
118
119
120
121
122
123 return;
124 }
125
126 if (unlikely(PageCompound(page)))
127 __put_compound_page(page);
128 else
129 __put_single_page(page);
130}
131EXPORT_SYMBOL(__put_page);
132
133
134
135
136
137
138
139
140void put_pages_list(struct list_head *pages)
141{
142 while (!list_empty(pages)) {
143 struct page *victim;
144
145 victim = lru_to_page(pages);
146 list_del(&victim->lru);
147 put_page(victim);
148 }
149}
150EXPORT_SYMBOL(put_pages_list);
151
152
153
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156
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160
161
162
163
164
165int get_kernel_pages(const struct kvec *kiov, int nr_segs, int write,
166 struct page **pages)
167{
168 int seg;
169
170 for (seg = 0; seg < nr_segs; seg++) {
171 if (WARN_ON(kiov[seg].iov_len != PAGE_SIZE))
172 return seg;
173
174 pages[seg] = kmap_to_page(kiov[seg].iov_base);
175 get_page(pages[seg]);
176 }
177
178 return seg;
179}
180EXPORT_SYMBOL_GPL(get_kernel_pages);
181
182
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186
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188
189
190
191
192
193int get_kernel_page(unsigned long start, int write, struct page **pages)
194{
195 const struct kvec kiov = {
196 .iov_base = (void *)start,
197 .iov_len = PAGE_SIZE
198 };
199
200 return get_kernel_pages(&kiov, 1, write, pages);
201}
202EXPORT_SYMBOL_GPL(get_kernel_page);
203
204static void pagevec_lru_move_fn(struct pagevec *pvec,
205 void (*move_fn)(struct page *page, struct lruvec *lruvec))
206{
207 int i;
208 struct lruvec *lruvec = NULL;
209 unsigned long flags = 0;
210
211 for (i = 0; i < pagevec_count(pvec); i++) {
212 struct page *page = pvec->pages[i];
213
214
215 if (!TestClearPageLRU(page))
216 continue;
217
218 lruvec = relock_page_lruvec_irqsave(page, lruvec, &flags);
219 (*move_fn)(page, lruvec);
220
221 SetPageLRU(page);
222 }
223 if (lruvec)
224 unlock_page_lruvec_irqrestore(lruvec, flags);
225 release_pages(pvec->pages, pvec->nr);
226 pagevec_reinit(pvec);
227}
228
229static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec)
230{
231 if (!PageUnevictable(page)) {
232 del_page_from_lru_list(page, lruvec);
233 ClearPageActive(page);
234 add_page_to_lru_list_tail(page, lruvec);
235 __count_vm_events(PGROTATED, thp_nr_pages(page));
236 }
237}
238
239
240static bool pagevec_add_and_need_flush(struct pagevec *pvec, struct page *page)
241{
242 bool ret = false;
243
244 if (!pagevec_add(pvec, page) || PageCompound(page) ||
245 lru_cache_disabled())
246 ret = true;
247
248 return ret;
249}
250
251
252
253
254
255
256
257
258void rotate_reclaimable_page(struct page *page)
259{
260 if (!PageLocked(page) && !PageDirty(page) &&
261 !PageUnevictable(page) && PageLRU(page)) {
262 struct pagevec *pvec;
263 unsigned long flags;
264
265 get_page(page);
266 local_lock_irqsave(&lru_rotate.lock, flags);
267 pvec = this_cpu_ptr(&lru_rotate.pvec);
268 if (pagevec_add_and_need_flush(pvec, page))
269 pagevec_lru_move_fn(pvec, pagevec_move_tail_fn);
270 local_unlock_irqrestore(&lru_rotate.lock, flags);
271 }
272}
273
274void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
275{
276 do {
277 unsigned long lrusize;
278
279
280
281
282
283
284
285
286 spin_lock_irq(&lruvec->lru_lock);
287
288 if (file)
289 lruvec->file_cost += nr_pages;
290 else
291 lruvec->anon_cost += nr_pages;
292
293
294
295
296
297
298
299
300
301 lrusize = lruvec_page_state(lruvec, NR_INACTIVE_ANON) +
302 lruvec_page_state(lruvec, NR_ACTIVE_ANON) +
303 lruvec_page_state(lruvec, NR_INACTIVE_FILE) +
304 lruvec_page_state(lruvec, NR_ACTIVE_FILE);
305
306 if (lruvec->file_cost + lruvec->anon_cost > lrusize / 4) {
307 lruvec->file_cost /= 2;
308 lruvec->anon_cost /= 2;
309 }
310 spin_unlock_irq(&lruvec->lru_lock);
311 } while ((lruvec = parent_lruvec(lruvec)));
312}
313
314void lru_note_cost_page(struct page *page)
315{
316 lru_note_cost(mem_cgroup_page_lruvec(page),
317 page_is_file_lru(page), thp_nr_pages(page));
318}
319
320static void __activate_page(struct page *page, struct lruvec *lruvec)
321{
322 if (!PageActive(page) && !PageUnevictable(page)) {
323 int nr_pages = thp_nr_pages(page);
324
325 del_page_from_lru_list(page, lruvec);
326 SetPageActive(page);
327 add_page_to_lru_list(page, lruvec);
328 trace_mm_lru_activate(page);
329
330 __count_vm_events(PGACTIVATE, nr_pages);
331 __count_memcg_events(lruvec_memcg(lruvec), PGACTIVATE,
332 nr_pages);
333 }
334}
335
336#ifdef CONFIG_SMP
337static void activate_page_drain(int cpu)
338{
339 struct pagevec *pvec = &per_cpu(lru_pvecs.activate_page, cpu);
340
341 if (pagevec_count(pvec))
342 pagevec_lru_move_fn(pvec, __activate_page);
343}
344
345static bool need_activate_page_drain(int cpu)
346{
347 return pagevec_count(&per_cpu(lru_pvecs.activate_page, cpu)) != 0;
348}
349
350static void activate_page(struct page *page)
351{
352 page = compound_head(page);
353 if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
354 struct pagevec *pvec;
355
356 local_lock(&lru_pvecs.lock);
357 pvec = this_cpu_ptr(&lru_pvecs.activate_page);
358 get_page(page);
359 if (pagevec_add_and_need_flush(pvec, page))
360 pagevec_lru_move_fn(pvec, __activate_page);
361 local_unlock(&lru_pvecs.lock);
362 }
363}
364
365#else
366static inline void activate_page_drain(int cpu)
367{
368}
369
370static void activate_page(struct page *page)
371{
372 struct lruvec *lruvec;
373
374 page = compound_head(page);
375 if (TestClearPageLRU(page)) {
376 lruvec = lock_page_lruvec_irq(page);
377 __activate_page(page, lruvec);
378 unlock_page_lruvec_irq(lruvec);
379 SetPageLRU(page);
380 }
381}
382#endif
383
384static void __lru_cache_activate_page(struct page *page)
385{
386 struct pagevec *pvec;
387 int i;
388
389 local_lock(&lru_pvecs.lock);
390 pvec = this_cpu_ptr(&lru_pvecs.lru_add);
391
392
393
394
395
396
397
398
399
400
401
402 for (i = pagevec_count(pvec) - 1; i >= 0; i--) {
403 struct page *pagevec_page = pvec->pages[i];
404
405 if (pagevec_page == page) {
406 SetPageActive(page);
407 break;
408 }
409 }
410
411 local_unlock(&lru_pvecs.lock);
412}
413
414
415
416
417
418
419
420
421
422
423
424void mark_page_accessed(struct page *page)
425{
426 page = compound_head(page);
427
428 if (!PageReferenced(page)) {
429 SetPageReferenced(page);
430 } else if (PageUnevictable(page)) {
431
432
433
434
435
436 } else if (!PageActive(page)) {
437
438
439
440
441
442
443 if (PageLRU(page))
444 activate_page(page);
445 else
446 __lru_cache_activate_page(page);
447 ClearPageReferenced(page);
448 workingset_activation(page);
449 }
450 if (page_is_idle(page))
451 clear_page_idle(page);
452}
453EXPORT_SYMBOL(mark_page_accessed);
454
455
456
457
458
459
460
461
462
463
464void lru_cache_add(struct page *page)
465{
466 struct pagevec *pvec;
467
468 VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
469 VM_BUG_ON_PAGE(PageLRU(page), page);
470
471 get_page(page);
472 local_lock(&lru_pvecs.lock);
473 pvec = this_cpu_ptr(&lru_pvecs.lru_add);
474 if (pagevec_add_and_need_flush(pvec, page))
475 __pagevec_lru_add(pvec);
476 local_unlock(&lru_pvecs.lock);
477}
478EXPORT_SYMBOL(lru_cache_add);
479
480
481
482
483
484
485
486
487
488void lru_cache_add_inactive_or_unevictable(struct page *page,
489 struct vm_area_struct *vma)
490{
491 bool unevictable;
492
493 VM_BUG_ON_PAGE(PageLRU(page), page);
494
495 unevictable = (vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED;
496 if (unlikely(unevictable) && !TestSetPageMlocked(page)) {
497 int nr_pages = thp_nr_pages(page);
498
499
500
501
502
503 __mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
504 count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
505 }
506 lru_cache_add(page);
507}
508
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528
529
530static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec)
531{
532 bool active = PageActive(page);
533 int nr_pages = thp_nr_pages(page);
534
535 if (PageUnevictable(page))
536 return;
537
538
539 if (page_mapped(page))
540 return;
541
542 del_page_from_lru_list(page, lruvec);
543 ClearPageActive(page);
544 ClearPageReferenced(page);
545
546 if (PageWriteback(page) || PageDirty(page)) {
547
548
549
550
551
552 add_page_to_lru_list(page, lruvec);
553 SetPageReclaim(page);
554 } else {
555
556
557
558
559 add_page_to_lru_list_tail(page, lruvec);
560 __count_vm_events(PGROTATED, nr_pages);
561 }
562
563 if (active) {
564 __count_vm_events(PGDEACTIVATE, nr_pages);
565 __count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE,
566 nr_pages);
567 }
568}
569
570static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec)
571{
572 if (PageActive(page) && !PageUnevictable(page)) {
573 int nr_pages = thp_nr_pages(page);
574
575 del_page_from_lru_list(page, lruvec);
576 ClearPageActive(page);
577 ClearPageReferenced(page);
578 add_page_to_lru_list(page, lruvec);
579
580 __count_vm_events(PGDEACTIVATE, nr_pages);
581 __count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE,
582 nr_pages);
583 }
584}
585
586static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec)
587{
588 if (PageAnon(page) && PageSwapBacked(page) &&
589 !PageSwapCache(page) && !PageUnevictable(page)) {
590 int nr_pages = thp_nr_pages(page);
591
592 del_page_from_lru_list(page, lruvec);
593 ClearPageActive(page);
594 ClearPageReferenced(page);
595
596
597
598
599
600 ClearPageSwapBacked(page);
601 add_page_to_lru_list(page, lruvec);
602
603 __count_vm_events(PGLAZYFREE, nr_pages);
604 __count_memcg_events(lruvec_memcg(lruvec), PGLAZYFREE,
605 nr_pages);
606 }
607}
608
609
610
611
612
613
614void lru_add_drain_cpu(int cpu)
615{
616 struct pagevec *pvec = &per_cpu(lru_pvecs.lru_add, cpu);
617
618 if (pagevec_count(pvec))
619 __pagevec_lru_add(pvec);
620
621 pvec = &per_cpu(lru_rotate.pvec, cpu);
622
623 if (data_race(pagevec_count(pvec))) {
624 unsigned long flags;
625
626
627 local_lock_irqsave(&lru_rotate.lock, flags);
628 pagevec_lru_move_fn(pvec, pagevec_move_tail_fn);
629 local_unlock_irqrestore(&lru_rotate.lock, flags);
630 }
631
632 pvec = &per_cpu(lru_pvecs.lru_deactivate_file, cpu);
633 if (pagevec_count(pvec))
634 pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
635
636 pvec = &per_cpu(lru_pvecs.lru_deactivate, cpu);
637 if (pagevec_count(pvec))
638 pagevec_lru_move_fn(pvec, lru_deactivate_fn);
639
640 pvec = &per_cpu(lru_pvecs.lru_lazyfree, cpu);
641 if (pagevec_count(pvec))
642 pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
643
644 activate_page_drain(cpu);
645 invalidate_bh_lrus_cpu(cpu);
646}
647
648
649
650
651
652
653
654
655
656void deactivate_file_page(struct page *page)
657{
658
659
660
661
662 if (PageUnevictable(page))
663 return;
664
665 if (likely(get_page_unless_zero(page))) {
666 struct pagevec *pvec;
667
668 local_lock(&lru_pvecs.lock);
669 pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
670
671 if (pagevec_add_and_need_flush(pvec, page))
672 pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
673 local_unlock(&lru_pvecs.lock);
674 }
675}
676
677
678
679
680
681
682
683
684
685void deactivate_page(struct page *page)
686{
687 if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
688 struct pagevec *pvec;
689
690 local_lock(&lru_pvecs.lock);
691 pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate);
692 get_page(page);
693 if (pagevec_add_and_need_flush(pvec, page))
694 pagevec_lru_move_fn(pvec, lru_deactivate_fn);
695 local_unlock(&lru_pvecs.lock);
696 }
697}
698
699
700
701
702
703
704
705
706void mark_page_lazyfree(struct page *page)
707{
708 if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
709 !PageSwapCache(page) && !PageUnevictable(page)) {
710 struct pagevec *pvec;
711
712 local_lock(&lru_pvecs.lock);
713 pvec = this_cpu_ptr(&lru_pvecs.lru_lazyfree);
714 get_page(page);
715 if (pagevec_add_and_need_flush(pvec, page))
716 pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
717 local_unlock(&lru_pvecs.lock);
718 }
719}
720
721void lru_add_drain(void)
722{
723 local_lock(&lru_pvecs.lock);
724 lru_add_drain_cpu(smp_processor_id());
725 local_unlock(&lru_pvecs.lock);
726}
727
728void lru_add_drain_cpu_zone(struct zone *zone)
729{
730 local_lock(&lru_pvecs.lock);
731 lru_add_drain_cpu(smp_processor_id());
732 drain_local_pages(zone);
733 local_unlock(&lru_pvecs.lock);
734}
735
736#ifdef CONFIG_SMP
737
738static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
739
740static void lru_add_drain_per_cpu(struct work_struct *dummy)
741{
742 lru_add_drain();
743}
744
745
746
747
748
749
750
751
752inline void __lru_add_drain_all(bool force_all_cpus)
753{
754
755
756
757
758
759
760
761
762
763
764 static unsigned int lru_drain_gen;
765 static struct cpumask has_work;
766 static DEFINE_MUTEX(lock);
767 unsigned cpu, this_gen;
768
769
770
771
772
773 if (WARN_ON(!mm_percpu_wq))
774 return;
775
776
777
778
779
780 smp_mb();
781
782
783
784
785
786
787
788
789 this_gen = smp_load_acquire(&lru_drain_gen);
790
791 mutex_lock(&lock);
792
793
794
795
796
797 if (unlikely(this_gen != lru_drain_gen && !force_all_cpus))
798 goto done;
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820 WRITE_ONCE(lru_drain_gen, lru_drain_gen + 1);
821 smp_mb();
822
823 cpumask_clear(&has_work);
824 for_each_online_cpu(cpu) {
825 struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
826
827 if (force_all_cpus ||
828 pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
829 data_race(pagevec_count(&per_cpu(lru_rotate.pvec, cpu))) ||
830 pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) ||
831 pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
832 pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
833 need_activate_page_drain(cpu) ||
834 has_bh_in_lru(cpu, NULL)) {
835 INIT_WORK(work, lru_add_drain_per_cpu);
836 queue_work_on(cpu, mm_percpu_wq, work);
837 __cpumask_set_cpu(cpu, &has_work);
838 }
839 }
840
841 for_each_cpu(cpu, &has_work)
842 flush_work(&per_cpu(lru_add_drain_work, cpu));
843
844done:
845 mutex_unlock(&lock);
846}
847
848void lru_add_drain_all(void)
849{
850 __lru_add_drain_all(false);
851}
852#else
853void lru_add_drain_all(void)
854{
855 lru_add_drain();
856}
857#endif
858
859atomic_t lru_disable_count = ATOMIC_INIT(0);
860
861
862
863
864
865
866
867
868
869void lru_cache_disable(void)
870{
871 atomic_inc(&lru_disable_count);
872#ifdef CONFIG_SMP
873
874
875
876
877
878
879
880
881 __lru_add_drain_all(true);
882#else
883 lru_add_drain();
884#endif
885}
886
887
888
889
890
891
892
893
894
895void release_pages(struct page **pages, int nr)
896{
897 int i;
898 LIST_HEAD(pages_to_free);
899 struct lruvec *lruvec = NULL;
900 unsigned long flags;
901 unsigned int lock_batch;
902
903 for (i = 0; i < nr; i++) {
904 struct page *page = pages[i];
905
906
907
908
909
910
911 if (lruvec && ++lock_batch == SWAP_CLUSTER_MAX) {
912 unlock_page_lruvec_irqrestore(lruvec, flags);
913 lruvec = NULL;
914 }
915
916 page = compound_head(page);
917 if (is_huge_zero_page(page))
918 continue;
919
920 if (is_zone_device_page(page)) {
921 if (lruvec) {
922 unlock_page_lruvec_irqrestore(lruvec, flags);
923 lruvec = NULL;
924 }
925
926
927
928
929
930
931 if (page_is_devmap_managed(page)) {
932 put_devmap_managed_page(page);
933 continue;
934 }
935 if (put_page_testzero(page))
936 put_dev_pagemap(page->pgmap);
937 continue;
938 }
939
940 if (!put_page_testzero(page))
941 continue;
942
943 if (PageCompound(page)) {
944 if (lruvec) {
945 unlock_page_lruvec_irqrestore(lruvec, flags);
946 lruvec = NULL;
947 }
948 __put_compound_page(page);
949 continue;
950 }
951
952 if (PageLRU(page)) {
953 struct lruvec *prev_lruvec = lruvec;
954
955 lruvec = relock_page_lruvec_irqsave(page, lruvec,
956 &flags);
957 if (prev_lruvec != lruvec)
958 lock_batch = 0;
959
960 del_page_from_lru_list(page, lruvec);
961 __clear_page_lru_flags(page);
962 }
963
964 __ClearPageWaiters(page);
965
966 list_add(&page->lru, &pages_to_free);
967 }
968 if (lruvec)
969 unlock_page_lruvec_irqrestore(lruvec, flags);
970
971 mem_cgroup_uncharge_list(&pages_to_free);
972 free_unref_page_list(&pages_to_free);
973}
974EXPORT_SYMBOL(release_pages);
975
976
977
978
979
980
981
982
983
984
985
986void __pagevec_release(struct pagevec *pvec)
987{
988 if (!pvec->percpu_pvec_drained) {
989 lru_add_drain();
990 pvec->percpu_pvec_drained = true;
991 }
992 release_pages(pvec->pages, pagevec_count(pvec));
993 pagevec_reinit(pvec);
994}
995EXPORT_SYMBOL(__pagevec_release);
996
997static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec)
998{
999 int was_unevictable = TestClearPageUnevictable(page);
1000 int nr_pages = thp_nr_pages(page);
1001
1002 VM_BUG_ON_PAGE(PageLRU(page), page);
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030 SetPageLRU(page);
1031 smp_mb__after_atomic();
1032
1033 if (page_evictable(page)) {
1034 if (was_unevictable)
1035 __count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
1036 } else {
1037 ClearPageActive(page);
1038 SetPageUnevictable(page);
1039 if (!was_unevictable)
1040 __count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
1041 }
1042
1043 add_page_to_lru_list(page, lruvec);
1044 trace_mm_lru_insertion(page);
1045}
1046
1047
1048
1049
1050
1051void __pagevec_lru_add(struct pagevec *pvec)
1052{
1053 int i;
1054 struct lruvec *lruvec = NULL;
1055 unsigned long flags = 0;
1056
1057 for (i = 0; i < pagevec_count(pvec); i++) {
1058 struct page *page = pvec->pages[i];
1059
1060 lruvec = relock_page_lruvec_irqsave(page, lruvec, &flags);
1061 __pagevec_lru_add_fn(page, lruvec);
1062 }
1063 if (lruvec)
1064 unlock_page_lruvec_irqrestore(lruvec, flags);
1065 release_pages(pvec->pages, pvec->nr);
1066 pagevec_reinit(pvec);
1067}
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078void pagevec_remove_exceptionals(struct pagevec *pvec)
1079{
1080 int i, j;
1081
1082 for (i = 0, j = 0; i < pagevec_count(pvec); i++) {
1083 struct page *page = pvec->pages[i];
1084 if (!xa_is_value(page))
1085 pvec->pages[j++] = page;
1086 }
1087 pvec->nr = j;
1088}
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110unsigned pagevec_lookup_range(struct pagevec *pvec,
1111 struct address_space *mapping, pgoff_t *start, pgoff_t end)
1112{
1113 pvec->nr = find_get_pages_range(mapping, start, end, PAGEVEC_SIZE,
1114 pvec->pages);
1115 return pagevec_count(pvec);
1116}
1117EXPORT_SYMBOL(pagevec_lookup_range);
1118
1119unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
1120 struct address_space *mapping, pgoff_t *index, pgoff_t end,
1121 xa_mark_t tag)
1122{
1123 pvec->nr = find_get_pages_range_tag(mapping, index, end, tag,
1124 PAGEVEC_SIZE, pvec->pages);
1125 return pagevec_count(pvec);
1126}
1127EXPORT_SYMBOL(pagevec_lookup_range_tag);
1128
1129
1130
1131
1132void __init swap_setup(void)
1133{
1134 unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT);
1135
1136
1137 if (megs < 16)
1138 page_cluster = 2;
1139 else
1140 page_cluster = 3;
1141
1142
1143
1144
1145}
1146
1147#ifdef CONFIG_DEV_PAGEMAP_OPS
1148void put_devmap_managed_page(struct page *page)
1149{
1150 int count;
1151
1152 if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
1153 return;
1154
1155 count = page_ref_dec_return(page);
1156
1157
1158
1159
1160
1161
1162 if (count == 1)
1163 free_devmap_managed_page(page);
1164 else if (!count)
1165 __put_page(page);
1166}
1167EXPORT_SYMBOL(put_devmap_managed_page);
1168#endif
1169