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17#include <linux/stddef.h>
18#include <linux/mm.h>
19#include <linux/swap.h>
20#include <linux/interrupt.h>
21#include <linux/pagemap.h>
22#include <linux/jiffies.h>
23#include <linux/bootmem.h>
24#include <linux/memblock.h>
25#include <linux/compiler.h>
26#include <linux/kernel.h>
27#include <linux/kmemcheck.h>
28#include <linux/module.h>
29#include <linux/suspend.h>
30#include <linux/pagevec.h>
31#include <linux/blkdev.h>
32#include <linux/slab.h>
33#include <linux/ratelimit.h>
34#include <linux/oom.h>
35#include <linux/notifier.h>
36#include <linux/topology.h>
37#include <linux/sysctl.h>
38#include <linux/cpu.h>
39#include <linux/cpuset.h>
40#include <linux/memory_hotplug.h>
41#include <linux/nodemask.h>
42#include <linux/vmalloc.h>
43#include <linux/vmstat.h>
44#include <linux/mempolicy.h>
45#include <linux/stop_machine.h>
46#include <linux/sort.h>
47#include <linux/pfn.h>
48#include <linux/backing-dev.h>
49#include <linux/fault-inject.h>
50#include <linux/page-isolation.h>
51#include <linux/page_cgroup.h>
52#include <linux/debugobjects.h>
53#include <linux/kmemleak.h>
54#include <linux/compaction.h>
55#include <trace/events/kmem.h>
56#include <linux/ftrace_event.h>
57#include <linux/memcontrol.h>
58#include <linux/prefetch.h>
59#include <linux/mm_inline.h>
60#include <linux/migrate.h>
61#include <linux/page-debug-flags.h>
62#include <linux/hugetlb.h>
63#include <linux/sched/rt.h>
64
65#include <asm/sections.h>
66#include <asm/tlbflush.h>
67#include <asm/div64.h>
68#include "internal.h"
69
70
71static DEFINE_MUTEX(pcp_batch_high_lock);
72
73#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
74DEFINE_PER_CPU(int, numa_node);
75EXPORT_PER_CPU_SYMBOL(numa_node);
76#endif
77
78#ifdef CONFIG_HAVE_MEMORYLESS_NODES
79
80
81
82
83
84
85DEFINE_PER_CPU(int, _numa_mem_);
86EXPORT_PER_CPU_SYMBOL(_numa_mem_);
87#endif
88
89
90
91
92nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
93 [N_POSSIBLE] = NODE_MASK_ALL,
94 [N_ONLINE] = { { [0] = 1UL } },
95#ifndef CONFIG_NUMA
96 [N_NORMAL_MEMORY] = { { [0] = 1UL } },
97#ifdef CONFIG_HIGHMEM
98 [N_HIGH_MEMORY] = { { [0] = 1UL } },
99#endif
100#ifdef CONFIG_MOVABLE_NODE
101 [N_MEMORY] = { { [0] = 1UL } },
102#endif
103 [N_CPU] = { { [0] = 1UL } },
104#endif
105};
106EXPORT_SYMBOL(node_states);
107
108
109static DEFINE_SPINLOCK(managed_page_count_lock);
110
111unsigned long totalram_pages __read_mostly;
112unsigned long totalreserve_pages __read_mostly;
113
114
115
116
117
118
119unsigned long dirty_balance_reserve __read_mostly;
120
121int percpu_pagelist_fraction;
122gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
123
124#ifdef CONFIG_PM_SLEEP
125
126
127
128
129
130
131
132
133
134static gfp_t saved_gfp_mask;
135
136void pm_restore_gfp_mask(void)
137{
138 WARN_ON(!mutex_is_locked(&pm_mutex));
139 if (saved_gfp_mask) {
140 gfp_allowed_mask = saved_gfp_mask;
141 saved_gfp_mask = 0;
142 }
143}
144
145void pm_restrict_gfp_mask(void)
146{
147 WARN_ON(!mutex_is_locked(&pm_mutex));
148 WARN_ON(saved_gfp_mask);
149 saved_gfp_mask = gfp_allowed_mask;
150 gfp_allowed_mask &= ~GFP_IOFS;
151}
152
153bool pm_suspended_storage(void)
154{
155 if ((gfp_allowed_mask & GFP_IOFS) == GFP_IOFS)
156 return false;
157 return true;
158}
159#endif
160
161#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
162int pageblock_order __read_mostly;
163#endif
164
165static void __free_pages_ok(struct page *page, unsigned int order);
166
167
168
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172
173
174
175
176
177
178int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = {
179#ifdef CONFIG_ZONE_DMA
180 256,
181#endif
182#ifdef CONFIG_ZONE_DMA32
183 256,
184#endif
185#ifdef CONFIG_HIGHMEM
186 32,
187#endif
188 32,
189};
190
191EXPORT_SYMBOL(totalram_pages);
192
193static char * const zone_names[MAX_NR_ZONES] = {
194#ifdef CONFIG_ZONE_DMA
195 "DMA",
196#endif
197#ifdef CONFIG_ZONE_DMA32
198 "DMA32",
199#endif
200 "Normal",
201#ifdef CONFIG_HIGHMEM
202 "HighMem",
203#endif
204 "Movable",
205};
206
207int min_free_kbytes = 1024;
208int user_min_free_kbytes;
209
210static unsigned long __meminitdata nr_kernel_pages;
211static unsigned long __meminitdata nr_all_pages;
212static unsigned long __meminitdata dma_reserve;
213
214#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
215static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
216static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
217static unsigned long __initdata required_kernelcore;
218static unsigned long __initdata required_movablecore;
219static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
220
221
222int movable_zone;
223EXPORT_SYMBOL(movable_zone);
224#endif
225
226#if MAX_NUMNODES > 1
227int nr_node_ids __read_mostly = MAX_NUMNODES;
228int nr_online_nodes __read_mostly = 1;
229EXPORT_SYMBOL(nr_node_ids);
230EXPORT_SYMBOL(nr_online_nodes);
231#endif
232
233int page_group_by_mobility_disabled __read_mostly;
234
235void set_pageblock_migratetype(struct page *page, int migratetype)
236{
237
238 if (unlikely(page_group_by_mobility_disabled))
239 migratetype = MIGRATE_UNMOVABLE;
240
241 set_pageblock_flags_group(page, (unsigned long)migratetype,
242 PB_migrate, PB_migrate_end);
243}
244
245bool oom_killer_disabled __read_mostly;
246
247#ifdef CONFIG_DEBUG_VM
248static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
249{
250 int ret = 0;
251 unsigned seq;
252 unsigned long pfn = page_to_pfn(page);
253 unsigned long sp, start_pfn;
254
255 do {
256 seq = zone_span_seqbegin(zone);
257 start_pfn = zone->zone_start_pfn;
258 sp = zone->spanned_pages;
259 if (!zone_spans_pfn(zone, pfn))
260 ret = 1;
261 } while (zone_span_seqretry(zone, seq));
262
263 if (ret)
264 pr_err("page %lu outside zone [ %lu - %lu ]\n",
265 pfn, start_pfn, start_pfn + sp);
266
267 return ret;
268}
269
270static int page_is_consistent(struct zone *zone, struct page *page)
271{
272 if (!pfn_valid_within(page_to_pfn(page)))
273 return 0;
274 if (zone != page_zone(page))
275 return 0;
276
277 return 1;
278}
279
280
281
282static int bad_range(struct zone *zone, struct page *page)
283{
284 if (page_outside_zone_boundaries(zone, page))
285 return 1;
286 if (!page_is_consistent(zone, page))
287 return 1;
288
289 return 0;
290}
291#else
292static inline int bad_range(struct zone *zone, struct page *page)
293{
294 return 0;
295}
296#endif
297
298static void bad_page(struct page *page)
299{
300 static unsigned long resume;
301 static unsigned long nr_shown;
302 static unsigned long nr_unshown;
303
304
305 if (PageHWPoison(page)) {
306 page_mapcount_reset(page);
307 return;
308 }
309
310
311
312
313
314 if (nr_shown == 60) {
315 if (time_before(jiffies, resume)) {
316 nr_unshown++;
317 goto out;
318 }
319 if (nr_unshown) {
320 printk(KERN_ALERT
321 "BUG: Bad page state: %lu messages suppressed\n",
322 nr_unshown);
323 nr_unshown = 0;
324 }
325 nr_shown = 0;
326 }
327 if (nr_shown++ == 0)
328 resume = jiffies + 60 * HZ;
329
330 printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n",
331 current->comm, page_to_pfn(page));
332 dump_page(page);
333
334 print_modules();
335 dump_stack();
336out:
337
338 page_mapcount_reset(page);
339 add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
340}
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356
357static void free_compound_page(struct page *page)
358{
359 __free_pages_ok(page, compound_order(page));
360}
361
362void prep_compound_page(struct page *page, unsigned long order)
363{
364 int i;
365 int nr_pages = 1 << order;
366
367 set_compound_page_dtor(page, free_compound_page);
368 set_compound_order(page, order);
369 __SetPageHead(page);
370 for (i = 1; i < nr_pages; i++) {
371 struct page *p = page + i;
372 __SetPageTail(p);
373 set_page_count(p, 0);
374 p->first_page = page;
375 }
376}
377
378
379static int destroy_compound_page(struct page *page, unsigned long order)
380{
381 int i;
382 int nr_pages = 1 << order;
383 int bad = 0;
384
385 if (unlikely(compound_order(page) != order)) {
386 bad_page(page);
387 bad++;
388 }
389
390 __ClearPageHead(page);
391
392 for (i = 1; i < nr_pages; i++) {
393 struct page *p = page + i;
394
395 if (unlikely(!PageTail(p) || (p->first_page != page))) {
396 bad_page(page);
397 bad++;
398 }
399 __ClearPageTail(p);
400 }
401
402 return bad;
403}
404
405static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
406{
407 int i;
408
409
410
411
412
413 VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt());
414 for (i = 0; i < (1 << order); i++)
415 clear_highpage(page + i);
416}
417
418#ifdef CONFIG_DEBUG_PAGEALLOC
419unsigned int _debug_guardpage_minorder;
420
421static int __init debug_guardpage_minorder_setup(char *buf)
422{
423 unsigned long res;
424
425 if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) {
426 printk(KERN_ERR "Bad debug_guardpage_minorder value\n");
427 return 0;
428 }
429 _debug_guardpage_minorder = res;
430 printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res);
431 return 0;
432}
433__setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup);
434
435static inline void set_page_guard_flag(struct page *page)
436{
437 __set_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
438}
439
440static inline void clear_page_guard_flag(struct page *page)
441{
442 __clear_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
443}
444#else
445static inline void set_page_guard_flag(struct page *page) { }
446static inline void clear_page_guard_flag(struct page *page) { }
447#endif
448
449static inline void set_page_order(struct page *page, int order)
450{
451 set_page_private(page, order);
452 __SetPageBuddy(page);
453}
454
455static inline void rmv_page_order(struct page *page)
456{
457 __ClearPageBuddy(page);
458 set_page_private(page, 0);
459}
460
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477
478static inline unsigned long
479__find_buddy_index(unsigned long page_idx, unsigned int order)
480{
481 return page_idx ^ (1 << order);
482}
483
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498
499static inline int page_is_buddy(struct page *page, struct page *buddy,
500 int order)
501{
502 if (!pfn_valid_within(page_to_pfn(buddy)))
503 return 0;
504
505 if (page_zone_id(page) != page_zone_id(buddy))
506 return 0;
507
508 if (page_is_guard(buddy) && page_order(buddy) == order) {
509 VM_BUG_ON(page_count(buddy) != 0);
510 return 1;
511 }
512
513 if (PageBuddy(buddy) && page_order(buddy) == order) {
514 VM_BUG_ON(page_count(buddy) != 0);
515 return 1;
516 }
517 return 0;
518}
519
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545static inline void __free_one_page(struct page *page,
546 struct zone *zone, unsigned int order,
547 int migratetype)
548{
549 unsigned long page_idx;
550 unsigned long combined_idx;
551 unsigned long uninitialized_var(buddy_idx);
552 struct page *buddy;
553
554 VM_BUG_ON(!zone_is_initialized(zone));
555
556 if (unlikely(PageCompound(page)))
557 if (unlikely(destroy_compound_page(page, order)))
558 return;
559
560 VM_BUG_ON(migratetype == -1);
561
562 page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1);
563
564 VM_BUG_ON(page_idx & ((1 << order) - 1));
565 VM_BUG_ON(bad_range(zone, page));
566
567 while (order < MAX_ORDER-1) {
568 buddy_idx = __find_buddy_index(page_idx, order);
569 buddy = page + (buddy_idx - page_idx);
570 if (!page_is_buddy(page, buddy, order))
571 break;
572
573
574
575
576 if (page_is_guard(buddy)) {
577 clear_page_guard_flag(buddy);
578 set_page_private(page, 0);
579 __mod_zone_freepage_state(zone, 1 << order,
580 migratetype);
581 } else {
582 list_del(&buddy->lru);
583 zone->free_area[order].nr_free--;
584 rmv_page_order(buddy);
585 }
586 combined_idx = buddy_idx & page_idx;
587 page = page + (combined_idx - page_idx);
588 page_idx = combined_idx;
589 order++;
590 }
591 set_page_order(page, order);
592
593
594
595
596
597
598
599
600
601 if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) {
602 struct page *higher_page, *higher_buddy;
603 combined_idx = buddy_idx & page_idx;
604 higher_page = page + (combined_idx - page_idx);
605 buddy_idx = __find_buddy_index(combined_idx, order + 1);
606 higher_buddy = higher_page + (buddy_idx - combined_idx);
607 if (page_is_buddy(higher_page, higher_buddy, order + 1)) {
608 list_add_tail(&page->lru,
609 &zone->free_area[order].free_list[migratetype]);
610 goto out;
611 }
612 }
613
614 list_add(&page->lru, &zone->free_area[order].free_list[migratetype]);
615out:
616 zone->free_area[order].nr_free++;
617}
618
619static inline int free_pages_check(struct page *page)
620{
621 if (unlikely(page_mapcount(page) |
622 (page->mapping != NULL) |
623 (atomic_read(&page->_count) != 0) |
624 (page->flags & PAGE_FLAGS_CHECK_AT_FREE) |
625 (mem_cgroup_bad_page_check(page)))) {
626 bad_page(page);
627 return 1;
628 }
629 page_nid_reset_last(page);
630 if (page->flags & PAGE_FLAGS_CHECK_AT_PREP)
631 page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
632 return 0;
633}
634
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640
641
642
643
644
645
646static void free_pcppages_bulk(struct zone *zone, int count,
647 struct per_cpu_pages *pcp)
648{
649 int migratetype = 0;
650 int batch_free = 0;
651 int to_free = count;
652
653 spin_lock(&zone->lock);
654 zone->pages_scanned = 0;
655
656 while (to_free) {
657 struct page *page;
658 struct list_head *list;
659
660
661
662
663
664
665
666
667 do {
668 batch_free++;
669 if (++migratetype == MIGRATE_PCPTYPES)
670 migratetype = 0;
671 list = &pcp->lists[migratetype];
672 } while (list_empty(list));
673
674
675 if (batch_free == MIGRATE_PCPTYPES)
676 batch_free = to_free;
677
678 do {
679 int mt;
680
681 page = list_entry(list->prev, struct page, lru);
682
683 list_del(&page->lru);
684 mt = get_freepage_migratetype(page);
685
686 __free_one_page(page, zone, 0, mt);
687 trace_mm_page_pcpu_drain(page, 0, mt);
688 if (likely(!is_migrate_isolate_page(page))) {
689 __mod_zone_page_state(zone, NR_FREE_PAGES, 1);
690 if (is_migrate_cma(mt))
691 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
692 }
693 } while (--to_free && --batch_free && !list_empty(list));
694 }
695 spin_unlock(&zone->lock);
696}
697
698static void free_one_page(struct zone *zone, struct page *page, int order,
699 int migratetype)
700{
701 spin_lock(&zone->lock);
702 zone->pages_scanned = 0;
703
704 __free_one_page(page, zone, order, migratetype);
705 if (unlikely(!is_migrate_isolate(migratetype)))
706 __mod_zone_freepage_state(zone, 1 << order, migratetype);
707 spin_unlock(&zone->lock);
708}
709
710static bool free_pages_prepare(struct page *page, unsigned int order)
711{
712 int i;
713 int bad = 0;
714
715 trace_mm_page_free(page, order);
716 kmemcheck_free_shadow(page, order);
717
718 if (PageAnon(page))
719 page->mapping = NULL;
720 for (i = 0; i < (1 << order); i++)
721 bad += free_pages_check(page + i);
722 if (bad)
723 return false;
724
725 if (!PageHighMem(page)) {
726 debug_check_no_locks_freed(page_address(page),
727 PAGE_SIZE << order);
728 debug_check_no_obj_freed(page_address(page),
729 PAGE_SIZE << order);
730 }
731 arch_free_page(page, order);
732 kernel_map_pages(page, 1 << order, 0);
733
734 return true;
735}
736
737static void __free_pages_ok(struct page *page, unsigned int order)
738{
739 unsigned long flags;
740 int migratetype;
741
742 if (!free_pages_prepare(page, order))
743 return;
744
745 local_irq_save(flags);
746 __count_vm_events(PGFREE, 1 << order);
747 migratetype = get_pageblock_migratetype(page);
748 set_freepage_migratetype(page, migratetype);
749 free_one_page(page_zone(page), page, order, migratetype);
750 local_irq_restore(flags);
751}
752
753void __init __free_pages_bootmem(struct page *page, unsigned int order)
754{
755 unsigned int nr_pages = 1 << order;
756 struct page *p = page;
757 unsigned int loop;
758
759 prefetchw(p);
760 for (loop = 0; loop < (nr_pages - 1); loop++, p++) {
761 prefetchw(p + 1);
762 __ClearPageReserved(p);
763 set_page_count(p, 0);
764 }
765 __ClearPageReserved(p);
766 set_page_count(p, 0);
767
768 page_zone(page)->managed_pages += nr_pages;
769 set_page_refcounted(page);
770 __free_pages(page, order);
771}
772
773#ifdef CONFIG_CMA
774
775void __init init_cma_reserved_pageblock(struct page *page)
776{
777 unsigned i = pageblock_nr_pages;
778 struct page *p = page;
779
780 do {
781 __ClearPageReserved(p);
782 set_page_count(p, 0);
783 } while (++p, --i);
784
785 set_page_refcounted(page);
786 set_pageblock_migratetype(page, MIGRATE_CMA);
787 __free_pages(page, pageblock_order);
788 adjust_managed_page_count(page, pageblock_nr_pages);
789}
790#endif
791
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805
806static inline void expand(struct zone *zone, struct page *page,
807 int low, int high, struct free_area *area,
808 int migratetype)
809{
810 unsigned long size = 1 << high;
811
812 while (high > low) {
813 area--;
814 high--;
815 size >>= 1;
816 VM_BUG_ON(bad_range(zone, &page[size]));
817
818#ifdef CONFIG_DEBUG_PAGEALLOC
819 if (high < debug_guardpage_minorder()) {
820
821
822
823
824
825
826 INIT_LIST_HEAD(&page[size].lru);
827 set_page_guard_flag(&page[size]);
828 set_page_private(&page[size], high);
829
830 __mod_zone_freepage_state(zone, -(1 << high),
831 migratetype);
832 continue;
833 }
834#endif
835 list_add(&page[size].lru, &area->free_list[migratetype]);
836 area->nr_free++;
837 set_page_order(&page[size], high);
838 }
839}
840
841
842
843
844static inline int check_new_page(struct page *page)
845{
846 if (unlikely(page_mapcount(page) |
847 (page->mapping != NULL) |
848 (atomic_read(&page->_count) != 0) |
849 (page->flags & PAGE_FLAGS_CHECK_AT_PREP) |
850 (mem_cgroup_bad_page_check(page)))) {
851 bad_page(page);
852 return 1;
853 }
854 return 0;
855}
856
857static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
858{
859 int i;
860
861 for (i = 0; i < (1 << order); i++) {
862 struct page *p = page + i;
863 if (unlikely(check_new_page(p)))
864 return 1;
865 }
866
867 set_page_private(page, 0);
868 set_page_refcounted(page);
869
870 arch_alloc_page(page, order);
871 kernel_map_pages(page, 1 << order, 1);
872
873 if (gfp_flags & __GFP_ZERO)
874 prep_zero_page(page, order, gfp_flags);
875
876 if (order && (gfp_flags & __GFP_COMP))
877 prep_compound_page(page, order);
878
879 return 0;
880}
881
882
883
884
885
886static inline
887struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
888 int migratetype)
889{
890 unsigned int current_order;
891 struct free_area *area;
892 struct page *page;
893
894
895 for (current_order = order; current_order < MAX_ORDER; ++current_order) {
896 area = &(zone->free_area[current_order]);
897 if (list_empty(&area->free_list[migratetype]))
898 continue;
899
900 page = list_entry(area->free_list[migratetype].next,
901 struct page, lru);
902 list_del(&page->lru);
903 rmv_page_order(page);
904 area->nr_free--;
905 expand(zone, page, order, current_order, area, migratetype);
906 return page;
907 }
908
909 return NULL;
910}
911
912
913
914
915
916
917static int fallbacks[MIGRATE_TYPES][4] = {
918 [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE },
919 [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE },
920#ifdef CONFIG_CMA
921 [MIGRATE_MOVABLE] = { MIGRATE_CMA, MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE },
922 [MIGRATE_CMA] = { MIGRATE_RESERVE },
923#else
924 [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE },
925#endif
926 [MIGRATE_RESERVE] = { MIGRATE_RESERVE },
927#ifdef CONFIG_MEMORY_ISOLATION
928 [MIGRATE_ISOLATE] = { MIGRATE_RESERVE },
929#endif
930};
931
932
933
934
935
936
937int move_freepages(struct zone *zone,
938 struct page *start_page, struct page *end_page,
939 int migratetype)
940{
941 struct page *page;
942 unsigned long order;
943 int pages_moved = 0;
944
945#ifndef CONFIG_HOLES_IN_ZONE
946
947
948
949
950
951
952
953 BUG_ON(page_zone(start_page) != page_zone(end_page));
954#endif
955
956 for (page = start_page; page <= end_page;) {
957
958 VM_BUG_ON(page_to_nid(page) != zone_to_nid(zone));
959
960 if (!pfn_valid_within(page_to_pfn(page))) {
961 page++;
962 continue;
963 }
964
965 if (!PageBuddy(page)) {
966 page++;
967 continue;
968 }
969
970 order = page_order(page);
971 list_move(&page->lru,
972 &zone->free_area[order].free_list[migratetype]);
973 set_freepage_migratetype(page, migratetype);
974 page += 1 << order;
975 pages_moved += 1 << order;
976 }
977
978 return pages_moved;
979}
980
981int move_freepages_block(struct zone *zone, struct page *page,
982 int migratetype)
983{
984 unsigned long start_pfn, end_pfn;
985 struct page *start_page, *end_page;
986
987 start_pfn = page_to_pfn(page);
988 start_pfn = start_pfn & ~(pageblock_nr_pages-1);
989 start_page = pfn_to_page(start_pfn);
990 end_page = start_page + pageblock_nr_pages - 1;
991 end_pfn = start_pfn + pageblock_nr_pages - 1;
992
993
994 if (!zone_spans_pfn(zone, start_pfn))
995 start_page = page;
996 if (!zone_spans_pfn(zone, end_pfn))
997 return 0;
998
999 return move_freepages(zone, start_page, end_page, migratetype);
1000}
1001
1002static void change_pageblock_range(struct page *pageblock_page,
1003 int start_order, int migratetype)
1004{
1005 int nr_pageblocks = 1 << (start_order - pageblock_order);
1006
1007 while (nr_pageblocks--) {
1008 set_pageblock_migratetype(pageblock_page, migratetype);
1009 pageblock_page += pageblock_nr_pages;
1010 }
1011}
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025static int try_to_steal_freepages(struct zone *zone, struct page *page,
1026 int start_type, int fallback_type)
1027{
1028 int current_order = page_order(page);
1029
1030 if (is_migrate_cma(fallback_type))
1031 return fallback_type;
1032
1033
1034 if (current_order >= pageblock_order) {
1035 change_pageblock_range(page, current_order, start_type);
1036 return start_type;
1037 }
1038
1039 if (current_order >= pageblock_order / 2 ||
1040 start_type == MIGRATE_RECLAIMABLE ||
1041 page_group_by_mobility_disabled) {
1042 int pages;
1043
1044 pages = move_freepages_block(zone, page, start_type);
1045
1046
1047 if (pages >= (1 << (pageblock_order-1)) ||
1048 page_group_by_mobility_disabled) {
1049
1050 set_pageblock_migratetype(page, start_type);
1051 return start_type;
1052 }
1053
1054 }
1055
1056 return fallback_type;
1057}
1058
1059
1060static inline struct page *
1061__rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
1062{
1063 struct free_area *area;
1064 int current_order;
1065 struct page *page;
1066 int migratetype, new_type, i;
1067
1068
1069 for (current_order = MAX_ORDER-1; current_order >= order;
1070 --current_order) {
1071 for (i = 0;; i++) {
1072 migratetype = fallbacks[start_migratetype][i];
1073
1074
1075 if (migratetype == MIGRATE_RESERVE)
1076 break;
1077
1078 area = &(zone->free_area[current_order]);
1079 if (list_empty(&area->free_list[migratetype]))
1080 continue;
1081
1082 page = list_entry(area->free_list[migratetype].next,
1083 struct page, lru);
1084 area->nr_free--;
1085
1086 new_type = try_to_steal_freepages(zone, page,
1087 start_migratetype,
1088 migratetype);
1089
1090
1091 list_del(&page->lru);
1092 rmv_page_order(page);
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102 expand(zone, page, order, current_order, area,
1103 is_migrate_cma(migratetype)
1104 ? migratetype : start_migratetype);
1105
1106 trace_mm_page_alloc_extfrag(page, order,
1107 current_order, start_migratetype, migratetype,
1108 new_type == start_migratetype);
1109
1110 return page;
1111 }
1112 }
1113
1114 return NULL;
1115}
1116
1117
1118
1119
1120
1121static struct page *__rmqueue(struct zone *zone, unsigned int order,
1122 int migratetype)
1123{
1124 struct page *page;
1125
1126retry_reserve:
1127 page = __rmqueue_smallest(zone, order, migratetype);
1128
1129 if (unlikely(!page) && migratetype != MIGRATE_RESERVE) {
1130 page = __rmqueue_fallback(zone, order, migratetype);
1131
1132
1133
1134
1135
1136
1137 if (!page) {
1138 migratetype = MIGRATE_RESERVE;
1139 goto retry_reserve;
1140 }
1141 }
1142
1143 trace_mm_page_alloc_zone_locked(page, order, migratetype);
1144 return page;
1145}
1146
1147
1148
1149
1150
1151
1152static int rmqueue_bulk(struct zone *zone, unsigned int order,
1153 unsigned long count, struct list_head *list,
1154 int migratetype, int cold)
1155{
1156 int mt = migratetype, i;
1157
1158 spin_lock(&zone->lock);
1159 for (i = 0; i < count; ++i) {
1160 struct page *page = __rmqueue(zone, order, migratetype);
1161 if (unlikely(page == NULL))
1162 break;
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173 if (likely(cold == 0))
1174 list_add(&page->lru, list);
1175 else
1176 list_add_tail(&page->lru, list);
1177 if (IS_ENABLED(CONFIG_CMA)) {
1178 mt = get_pageblock_migratetype(page);
1179 if (!is_migrate_cma(mt) && !is_migrate_isolate(mt))
1180 mt = migratetype;
1181 }
1182 set_freepage_migratetype(page, mt);
1183 list = &page->lru;
1184 if (is_migrate_cma(mt))
1185 __mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
1186 -(1 << order));
1187 }
1188 __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
1189 spin_unlock(&zone->lock);
1190 return i;
1191}
1192
1193#ifdef CONFIG_NUMA
1194
1195
1196
1197
1198
1199
1200
1201
1202void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
1203{
1204 unsigned long flags;
1205 int to_drain;
1206 unsigned long batch;
1207
1208 local_irq_save(flags);
1209 batch = ACCESS_ONCE(pcp->batch);
1210 if (pcp->count >= batch)
1211 to_drain = batch;
1212 else
1213 to_drain = pcp->count;
1214 if (to_drain > 0) {
1215 free_pcppages_bulk(zone, to_drain, pcp);
1216 pcp->count -= to_drain;
1217 }
1218 local_irq_restore(flags);
1219}
1220#endif
1221
1222
1223
1224
1225
1226
1227
1228
1229static void drain_pages(unsigned int cpu)
1230{
1231 unsigned long flags;
1232 struct zone *zone;
1233
1234 for_each_populated_zone(zone) {
1235 struct per_cpu_pageset *pset;
1236 struct per_cpu_pages *pcp;
1237
1238 local_irq_save(flags);
1239 pset = per_cpu_ptr(zone->pageset, cpu);
1240
1241 pcp = &pset->pcp;
1242 if (pcp->count) {
1243 free_pcppages_bulk(zone, pcp->count, pcp);
1244 pcp->count = 0;
1245 }
1246 local_irq_restore(flags);
1247 }
1248}
1249
1250
1251
1252
1253void drain_local_pages(void *arg)
1254{
1255 drain_pages(smp_processor_id());
1256}
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267void drain_all_pages(void)
1268{
1269 int cpu;
1270 struct per_cpu_pageset *pcp;
1271 struct zone *zone;
1272
1273
1274
1275
1276
1277 static cpumask_t cpus_with_pcps;
1278
1279
1280
1281
1282
1283
1284
1285 for_each_online_cpu(cpu) {
1286 bool has_pcps = false;
1287 for_each_populated_zone(zone) {
1288 pcp = per_cpu_ptr(zone->pageset, cpu);
1289 if (pcp->pcp.count) {
1290 has_pcps = true;
1291 break;
1292 }
1293 }
1294 if (has_pcps)
1295 cpumask_set_cpu(cpu, &cpus_with_pcps);
1296 else
1297 cpumask_clear_cpu(cpu, &cpus_with_pcps);
1298 }
1299 on_each_cpu_mask(&cpus_with_pcps, drain_local_pages, NULL, 1);
1300}
1301
1302#ifdef CONFIG_HIBERNATION
1303
1304void mark_free_pages(struct zone *zone)
1305{
1306 unsigned long pfn, max_zone_pfn;
1307 unsigned long flags;
1308 int order, t;
1309 struct list_head *curr;
1310
1311 if (zone_is_empty(zone))
1312 return;
1313
1314 spin_lock_irqsave(&zone->lock, flags);
1315
1316 max_zone_pfn = zone_end_pfn(zone);
1317 for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
1318 if (pfn_valid(pfn)) {
1319 struct page *page = pfn_to_page(pfn);
1320
1321 if (!swsusp_page_is_forbidden(page))
1322 swsusp_unset_page_free(page);
1323 }
1324
1325 for_each_migratetype_order(order, t) {
1326 list_for_each(curr, &zone->free_area[order].free_list[t]) {
1327 unsigned long i;
1328
1329 pfn = page_to_pfn(list_entry(curr, struct page, lru));
1330 for (i = 0; i < (1UL << order); i++)
1331 swsusp_set_page_free(pfn_to_page(pfn + i));
1332 }
1333 }
1334 spin_unlock_irqrestore(&zone->lock, flags);
1335}
1336#endif
1337
1338
1339
1340
1341
1342void free_hot_cold_page(struct page *page, int cold)
1343{
1344 struct zone *zone = page_zone(page);
1345 struct per_cpu_pages *pcp;
1346 unsigned long flags;
1347 int migratetype;
1348
1349 if (!free_pages_prepare(page, 0))
1350 return;
1351
1352 migratetype = get_pageblock_migratetype(page);
1353 set_freepage_migratetype(page, migratetype);
1354 local_irq_save(flags);
1355 __count_vm_event(PGFREE);
1356
1357
1358
1359
1360
1361
1362
1363
1364 if (migratetype >= MIGRATE_PCPTYPES) {
1365 if (unlikely(is_migrate_isolate(migratetype))) {
1366 free_one_page(zone, page, 0, migratetype);
1367 goto out;
1368 }
1369 migratetype = MIGRATE_MOVABLE;
1370 }
1371
1372 pcp = &this_cpu_ptr(zone->pageset)->pcp;
1373 if (cold)
1374 list_add_tail(&page->lru, &pcp->lists[migratetype]);
1375 else
1376 list_add(&page->lru, &pcp->lists[migratetype]);
1377 pcp->count++;
1378 if (pcp->count >= pcp->high) {
1379 unsigned long batch = ACCESS_ONCE(pcp->batch);
1380 free_pcppages_bulk(zone, batch, pcp);
1381 pcp->count -= batch;
1382 }
1383
1384out:
1385 local_irq_restore(flags);
1386}
1387
1388
1389
1390
1391void free_hot_cold_page_list(struct list_head *list, int cold)
1392{
1393 struct page *page, *next;
1394
1395 list_for_each_entry_safe(page, next, list, lru) {
1396 trace_mm_page_free_batched(page, cold);
1397 free_hot_cold_page(page, cold);
1398 }
1399}
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409void split_page(struct page *page, unsigned int order)
1410{
1411 int i;
1412
1413 VM_BUG_ON(PageCompound(page));
1414 VM_BUG_ON(!page_count(page));
1415
1416#ifdef CONFIG_KMEMCHECK
1417
1418
1419
1420
1421 if (kmemcheck_page_is_tracked(page))
1422 split_page(virt_to_page(page[0].shadow), order);
1423#endif
1424
1425 for (i = 1; i < (1 << order); i++)
1426 set_page_refcounted(page + i);
1427}
1428EXPORT_SYMBOL_GPL(split_page);
1429
1430static int __isolate_free_page(struct page *page, unsigned int order)
1431{
1432 unsigned long watermark;
1433 struct zone *zone;
1434 int mt;
1435
1436 BUG_ON(!PageBuddy(page));
1437
1438 zone = page_zone(page);
1439 mt = get_pageblock_migratetype(page);
1440
1441 if (!is_migrate_isolate(mt)) {
1442
1443 watermark = low_wmark_pages(zone) + (1 << order);
1444 if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
1445 return 0;
1446
1447 __mod_zone_freepage_state(zone, -(1UL << order), mt);
1448 }
1449
1450
1451 list_del(&page->lru);
1452 zone->free_area[order].nr_free--;
1453 rmv_page_order(page);
1454
1455
1456 if (order >= pageblock_order - 1) {
1457 struct page *endpage = page + (1 << order) - 1;
1458 for (; page < endpage; page += pageblock_nr_pages) {
1459 int mt = get_pageblock_migratetype(page);
1460 if (!is_migrate_isolate(mt) && !is_migrate_cma(mt))
1461 set_pageblock_migratetype(page,
1462 MIGRATE_MOVABLE);
1463 }
1464 }
1465
1466 return 1UL << order;
1467}
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479int split_free_page(struct page *page)
1480{
1481 unsigned int order;
1482 int nr_pages;
1483
1484 order = page_order(page);
1485
1486 nr_pages = __isolate_free_page(page, order);
1487 if (!nr_pages)
1488 return 0;
1489
1490
1491 set_page_refcounted(page);
1492 split_page(page, order);
1493 return nr_pages;
1494}
1495
1496
1497
1498
1499
1500
1501static inline
1502struct page *buffered_rmqueue(struct zone *preferred_zone,
1503 struct zone *zone, int order, gfp_t gfp_flags,
1504 int migratetype)
1505{
1506 unsigned long flags;
1507 struct page *page;
1508 int cold = !!(gfp_flags & __GFP_COLD);
1509
1510again:
1511 if (likely(order == 0)) {
1512 struct per_cpu_pages *pcp;
1513 struct list_head *list;
1514
1515 local_irq_save(flags);
1516 pcp = &this_cpu_ptr(zone->pageset)->pcp;
1517 list = &pcp->lists[migratetype];
1518 if (list_empty(list)) {
1519 pcp->count += rmqueue_bulk(zone, 0,
1520 pcp->batch, list,
1521 migratetype, cold);
1522 if (unlikely(list_empty(list)))
1523 goto failed;
1524 }
1525
1526 if (cold)
1527 page = list_entry(list->prev, struct page, lru);
1528 else
1529 page = list_entry(list->next, struct page, lru);
1530
1531 list_del(&page->lru);
1532 pcp->count--;
1533 } else {
1534 if (unlikely(gfp_flags & __GFP_NOFAIL)) {
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545 WARN_ON_ONCE(order > 1);
1546 }
1547 spin_lock_irqsave(&zone->lock, flags);
1548 page = __rmqueue(zone, order, migratetype);
1549 spin_unlock(&zone->lock);
1550 if (!page)
1551 goto failed;
1552 __mod_zone_freepage_state(zone, -(1 << order),
1553 get_pageblock_migratetype(page));
1554 }
1555
1556 __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
1557 __count_zone_vm_events(PGALLOC, zone, 1 << order);
1558 zone_statistics(preferred_zone, zone, gfp_flags);
1559 local_irq_restore(flags);
1560
1561 VM_BUG_ON(bad_range(zone, page));
1562 if (prep_new_page(page, order, gfp_flags))
1563 goto again;
1564 return page;
1565
1566failed:
1567 local_irq_restore(flags);
1568 return NULL;
1569}
1570
1571#ifdef CONFIG_FAIL_PAGE_ALLOC
1572
1573static struct {
1574 struct fault_attr attr;
1575
1576 u32 ignore_gfp_highmem;
1577 u32 ignore_gfp_wait;
1578 u32 min_order;
1579} fail_page_alloc = {
1580 .attr = FAULT_ATTR_INITIALIZER,
1581 .ignore_gfp_wait = 1,
1582 .ignore_gfp_highmem = 1,
1583 .min_order = 1,
1584};
1585
1586static int __init setup_fail_page_alloc(char *str)
1587{
1588 return setup_fault_attr(&fail_page_alloc.attr, str);
1589}
1590__setup("fail_page_alloc=", setup_fail_page_alloc);
1591
1592static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
1593{
1594 if (order < fail_page_alloc.min_order)
1595 return false;
1596 if (gfp_mask & __GFP_NOFAIL)
1597 return false;
1598 if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM))
1599 return false;
1600 if (fail_page_alloc.ignore_gfp_wait && (gfp_mask & __GFP_WAIT))
1601 return false;
1602
1603 return should_fail(&fail_page_alloc.attr, 1 << order);
1604}
1605
1606#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
1607
1608static int __init fail_page_alloc_debugfs(void)
1609{
1610 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
1611 struct dentry *dir;
1612
1613 dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
1614 &fail_page_alloc.attr);
1615 if (IS_ERR(dir))
1616 return PTR_ERR(dir);
1617
1618 if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
1619 &fail_page_alloc.ignore_gfp_wait))
1620 goto fail;
1621 if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir,
1622 &fail_page_alloc.ignore_gfp_highmem))
1623 goto fail;
1624 if (!debugfs_create_u32("min-order", mode, dir,
1625 &fail_page_alloc.min_order))
1626 goto fail;
1627
1628 return 0;
1629fail:
1630 debugfs_remove_recursive(dir);
1631
1632 return -ENOMEM;
1633}
1634
1635late_initcall(fail_page_alloc_debugfs);
1636
1637#endif
1638
1639#else
1640
1641static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
1642{
1643 return false;
1644}
1645
1646#endif
1647
1648
1649
1650
1651
1652static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
1653 int classzone_idx, int alloc_flags, long free_pages)
1654{
1655
1656 long min = mark;
1657 long lowmem_reserve = z->lowmem_reserve[classzone_idx];
1658 int o;
1659 long free_cma = 0;
1660
1661 free_pages -= (1 << order) - 1;
1662 if (alloc_flags & ALLOC_HIGH)
1663 min -= min / 2;
1664 if (alloc_flags & ALLOC_HARDER)
1665 min -= min / 4;
1666#ifdef CONFIG_CMA
1667
1668 if (!(alloc_flags & ALLOC_CMA))
1669 free_cma = zone_page_state(z, NR_FREE_CMA_PAGES);
1670#endif
1671
1672 if (free_pages - free_cma <= min + lowmem_reserve)
1673 return false;
1674 for (o = 0; o < order; o++) {
1675
1676 free_pages -= z->free_area[o].nr_free << o;
1677
1678
1679 min >>= 1;
1680
1681 if (free_pages <= min)
1682 return false;
1683 }
1684 return true;
1685}
1686
1687bool zone_watermark_ok(struct zone *z, int order, unsigned long mark,
1688 int classzone_idx, int alloc_flags)
1689{
1690 return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags,
1691 zone_page_state(z, NR_FREE_PAGES));
1692}
1693
1694bool zone_watermark_ok_safe(struct zone *z, int order, unsigned long mark,
1695 int classzone_idx, int alloc_flags)
1696{
1697 long free_pages = zone_page_state(z, NR_FREE_PAGES);
1698
1699 if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark)
1700 free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES);
1701
1702 return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags,
1703 free_pages);
1704}
1705
1706#ifdef CONFIG_NUMA
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags)
1730{
1731 struct zonelist_cache *zlc;
1732 nodemask_t *allowednodes;
1733
1734 zlc = zonelist->zlcache_ptr;
1735 if (!zlc)
1736 return NULL;
1737
1738 if (time_after(jiffies, zlc->last_full_zap + HZ)) {
1739 bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
1740 zlc->last_full_zap = jiffies;
1741 }
1742
1743 allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ?
1744 &cpuset_current_mems_allowed :
1745 &node_states[N_MEMORY];
1746 return allowednodes;
1747}
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z,
1772 nodemask_t *allowednodes)
1773{
1774 struct zonelist_cache *zlc;
1775 int i;
1776 int n;
1777
1778 zlc = zonelist->zlcache_ptr;
1779 if (!zlc)
1780 return 1;
1781
1782 i = z - zonelist->_zonerefs;
1783 n = zlc->z_to_n[i];
1784
1785
1786 return node_isset(n, *allowednodes) && !test_bit(i, zlc->fullzones);
1787}
1788
1789
1790
1791
1792
1793
1794static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
1795{
1796 struct zonelist_cache *zlc;
1797 int i;
1798
1799 zlc = zonelist->zlcache_ptr;
1800 if (!zlc)
1801 return;
1802
1803 i = z - zonelist->_zonerefs;
1804
1805 set_bit(i, zlc->fullzones);
1806}
1807
1808
1809
1810
1811
1812static void zlc_clear_zones_full(struct zonelist *zonelist)
1813{
1814 struct zonelist_cache *zlc;
1815
1816 zlc = zonelist->zlcache_ptr;
1817 if (!zlc)
1818 return;
1819
1820 bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
1821}
1822
1823static bool zone_local(struct zone *local_zone, struct zone *zone)
1824{
1825 return node_distance(local_zone->node, zone->node) == LOCAL_DISTANCE;
1826}
1827
1828static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
1829{
1830 return node_isset(local_zone->node, zone->zone_pgdat->reclaim_nodes);
1831}
1832
1833static void __paginginit init_zone_allows_reclaim(int nid)
1834{
1835 int i;
1836
1837 for_each_online_node(i)
1838 if (node_distance(nid, i) <= RECLAIM_DISTANCE)
1839 node_set(i, NODE_DATA(nid)->reclaim_nodes);
1840 else
1841 zone_reclaim_mode = 1;
1842}
1843
1844#else
1845
1846static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags)
1847{
1848 return NULL;
1849}
1850
1851static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z,
1852 nodemask_t *allowednodes)
1853{
1854 return 1;
1855}
1856
1857static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
1858{
1859}
1860
1861static void zlc_clear_zones_full(struct zonelist *zonelist)
1862{
1863}
1864
1865static bool zone_local(struct zone *local_zone, struct zone *zone)
1866{
1867 return true;
1868}
1869
1870static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
1871{
1872 return true;
1873}
1874
1875static inline void init_zone_allows_reclaim(int nid)
1876{
1877}
1878#endif
1879
1880
1881
1882
1883
1884static struct page *
1885get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
1886 struct zonelist *zonelist, int high_zoneidx, int alloc_flags,
1887 struct zone *preferred_zone, int migratetype)
1888{
1889 struct zoneref *z;
1890 struct page *page = NULL;
1891 int classzone_idx;
1892 struct zone *zone;
1893 nodemask_t *allowednodes = NULL;
1894 int zlc_active = 0;
1895 int did_zlc_setup = 0;
1896
1897 classzone_idx = zone_idx(preferred_zone);
1898zonelist_scan:
1899
1900
1901
1902
1903 for_each_zone_zonelist_nodemask(zone, z, zonelist,
1904 high_zoneidx, nodemask) {
1905 unsigned long mark;
1906
1907 if (IS_ENABLED(CONFIG_NUMA) && zlc_active &&
1908 !zlc_zone_worth_trying(zonelist, z, allowednodes))
1909 continue;
1910 if ((alloc_flags & ALLOC_CPUSET) &&
1911 !cpuset_zone_allowed_softwall(zone, gfp_mask))
1912 continue;
1913 BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK);
1914 if (unlikely(alloc_flags & ALLOC_NO_WATERMARKS))
1915 goto try_this_zone;
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929 if (alloc_flags & ALLOC_WMARK_LOW) {
1930 if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0)
1931 continue;
1932 if (zone_reclaim_mode &&
1933 !zone_local(preferred_zone, zone))
1934 continue;
1935 }
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962 if ((alloc_flags & ALLOC_WMARK_LOW) &&
1963 (gfp_mask & __GFP_WRITE) && !zone_dirty_ok(zone))
1964 goto this_zone_full;
1965
1966 mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
1967 if (!zone_watermark_ok(zone, order, mark,
1968 classzone_idx, alloc_flags)) {
1969 int ret;
1970
1971 if (IS_ENABLED(CONFIG_NUMA) &&
1972 !did_zlc_setup && nr_online_nodes > 1) {
1973
1974
1975
1976
1977
1978 allowednodes = zlc_setup(zonelist, alloc_flags);
1979 zlc_active = 1;
1980 did_zlc_setup = 1;
1981 }
1982
1983 if (zone_reclaim_mode == 0 ||
1984 !zone_allows_reclaim(preferred_zone, zone))
1985 goto this_zone_full;
1986
1987
1988
1989
1990
1991 if (IS_ENABLED(CONFIG_NUMA) && zlc_active &&
1992 !zlc_zone_worth_trying(zonelist, z, allowednodes))
1993 continue;
1994
1995 ret = zone_reclaim(zone, gfp_mask, order);
1996 switch (ret) {
1997 case ZONE_RECLAIM_NOSCAN:
1998
1999 continue;
2000 case ZONE_RECLAIM_FULL:
2001
2002 continue;
2003 default:
2004
2005 if (zone_watermark_ok(zone, order, mark,
2006 classzone_idx, alloc_flags))
2007 goto try_this_zone;
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018 if (((alloc_flags & ALLOC_WMARK_MASK) == ALLOC_WMARK_MIN) ||
2019 ret == ZONE_RECLAIM_SOME)
2020 goto this_zone_full;
2021
2022 continue;
2023 }
2024 }
2025
2026try_this_zone:
2027 page = buffered_rmqueue(preferred_zone, zone, order,
2028 gfp_mask, migratetype);
2029 if (page)
2030 break;
2031this_zone_full:
2032 if (IS_ENABLED(CONFIG_NUMA))
2033 zlc_mark_zone_full(zonelist, z);
2034 }
2035
2036 if (unlikely(IS_ENABLED(CONFIG_NUMA) && page == NULL && zlc_active)) {
2037
2038 zlc_active = 0;
2039 goto zonelist_scan;
2040 }
2041
2042 if (page)
2043
2044
2045
2046
2047
2048
2049
2050 page->pfmemalloc = !!(alloc_flags & ALLOC_NO_WATERMARKS);
2051
2052 return page;
2053}
2054
2055
2056
2057
2058
2059static inline bool should_suppress_show_mem(void)
2060{
2061 bool ret = false;
2062
2063#if NODES_SHIFT > 8
2064 ret = in_interrupt();
2065#endif
2066 return ret;
2067}
2068
2069static DEFINE_RATELIMIT_STATE(nopage_rs,
2070 DEFAULT_RATELIMIT_INTERVAL,
2071 DEFAULT_RATELIMIT_BURST);
2072
2073void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...)
2074{
2075 unsigned int filter = SHOW_MEM_FILTER_NODES;
2076
2077 if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) ||
2078 debug_guardpage_minorder() > 0)
2079 return;
2080
2081
2082
2083
2084
2085 if (!(gfp_mask & __GFP_WAIT))
2086 filter |= SHOW_MEM_FILTER_PAGE_COUNT;
2087
2088
2089
2090
2091
2092
2093 if (!(gfp_mask & __GFP_NOMEMALLOC))
2094 if (test_thread_flag(TIF_MEMDIE) ||
2095 (current->flags & (PF_MEMALLOC | PF_EXITING)))
2096 filter &= ~SHOW_MEM_FILTER_NODES;
2097 if (in_interrupt() || !(gfp_mask & __GFP_WAIT))
2098 filter &= ~SHOW_MEM_FILTER_NODES;
2099
2100 if (fmt) {
2101 struct va_format vaf;
2102 va_list args;
2103
2104 va_start(args, fmt);
2105
2106 vaf.fmt = fmt;
2107 vaf.va = &args;
2108
2109 pr_warn("%pV", &vaf);
2110
2111 va_end(args);
2112 }
2113
2114 pr_warn("%s: page allocation failure: order:%d, mode:0x%x\n",
2115 current->comm, order, gfp_mask);
2116
2117 dump_stack();
2118 if (!should_suppress_show_mem())
2119 show_mem(filter);
2120}
2121
2122static inline int
2123should_alloc_retry(gfp_t gfp_mask, unsigned int order,
2124 unsigned long did_some_progress,
2125 unsigned long pages_reclaimed)
2126{
2127
2128 if (gfp_mask & __GFP_NORETRY)
2129 return 0;
2130
2131
2132 if (gfp_mask & __GFP_NOFAIL)
2133 return 1;
2134
2135
2136
2137
2138
2139
2140 if (!did_some_progress && pm_suspended_storage())
2141 return 0;
2142
2143
2144
2145
2146
2147
2148 if (order <= PAGE_ALLOC_COSTLY_ORDER)
2149 return 1;
2150
2151
2152
2153
2154
2155
2156
2157
2158 if (gfp_mask & __GFP_REPEAT && pages_reclaimed < (1 << order))
2159 return 1;
2160
2161 return 0;
2162}
2163
2164static inline struct page *
2165__alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
2166 struct zonelist *zonelist, enum zone_type high_zoneidx,
2167 nodemask_t *nodemask, struct zone *preferred_zone,
2168 int migratetype)
2169{
2170 struct page *page;
2171
2172
2173 if (!try_set_zonelist_oom(zonelist, gfp_mask)) {
2174 schedule_timeout_uninterruptible(1);
2175 return NULL;
2176 }
2177
2178
2179
2180
2181
2182
2183 page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
2184 order, zonelist, high_zoneidx,
2185 ALLOC_WMARK_HIGH|ALLOC_CPUSET,
2186 preferred_zone, migratetype);
2187 if (page)
2188 goto out;
2189
2190 if (!(gfp_mask & __GFP_NOFAIL)) {
2191
2192 if (order > PAGE_ALLOC_COSTLY_ORDER)
2193 goto out;
2194
2195 if (high_zoneidx < ZONE_NORMAL)
2196 goto out;
2197
2198
2199
2200
2201
2202
2203
2204 if (gfp_mask & __GFP_THISNODE)
2205 goto out;
2206 }
2207
2208 out_of_memory(zonelist, gfp_mask, order, nodemask, false);
2209
2210out:
2211 clear_zonelist_oom(zonelist, gfp_mask);
2212 return page;
2213}
2214
2215#ifdef CONFIG_COMPACTION
2216
2217static struct page *
2218__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
2219 struct zonelist *zonelist, enum zone_type high_zoneidx,
2220 nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
2221 int migratetype, bool sync_migration,
2222 bool *contended_compaction, bool *deferred_compaction,
2223 unsigned long *did_some_progress)
2224{
2225 if (!order)
2226 return NULL;
2227
2228 if (compaction_deferred(preferred_zone, order)) {
2229 *deferred_compaction = true;
2230 return NULL;
2231 }
2232
2233 current->flags |= PF_MEMALLOC;
2234 *did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask,
2235 nodemask, sync_migration,
2236 contended_compaction);
2237 current->flags &= ~PF_MEMALLOC;
2238
2239 if (*did_some_progress != COMPACT_SKIPPED) {
2240 struct page *page;
2241
2242
2243 drain_pages(get_cpu());
2244 put_cpu();
2245
2246 page = get_page_from_freelist(gfp_mask, nodemask,
2247 order, zonelist, high_zoneidx,
2248 alloc_flags & ~ALLOC_NO_WATERMARKS,
2249 preferred_zone, migratetype);
2250 if (page) {
2251 preferred_zone->compact_blockskip_flush = false;
2252 preferred_zone->compact_considered = 0;
2253 preferred_zone->compact_defer_shift = 0;
2254 if (order >= preferred_zone->compact_order_failed)
2255 preferred_zone->compact_order_failed = order + 1;
2256 count_vm_event(COMPACTSUCCESS);
2257 return page;
2258 }
2259
2260
2261
2262
2263
2264
2265 count_vm_event(COMPACTFAIL);
2266
2267
2268
2269
2270
2271 if (sync_migration)
2272 defer_compaction(preferred_zone, order);
2273
2274 cond_resched();
2275 }
2276
2277 return NULL;
2278}
2279#else
2280static inline struct page *
2281__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
2282 struct zonelist *zonelist, enum zone_type high_zoneidx,
2283 nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
2284 int migratetype, bool sync_migration,
2285 bool *contended_compaction, bool *deferred_compaction,
2286 unsigned long *did_some_progress)
2287{
2288 return NULL;
2289}
2290#endif
2291
2292
2293static int
2294__perform_reclaim(gfp_t gfp_mask, unsigned int order, struct zonelist *zonelist,
2295 nodemask_t *nodemask)
2296{
2297 struct reclaim_state reclaim_state;
2298 int progress;
2299
2300 cond_resched();
2301
2302
2303 cpuset_memory_pressure_bump();
2304 current->flags |= PF_MEMALLOC;
2305 lockdep_set_current_reclaim_state(gfp_mask);
2306 reclaim_state.reclaimed_slab = 0;
2307 current->reclaim_state = &reclaim_state;
2308
2309 progress = try_to_free_pages(zonelist, order, gfp_mask, nodemask);
2310
2311 current->reclaim_state = NULL;
2312 lockdep_clear_current_reclaim_state();
2313 current->flags &= ~PF_MEMALLOC;
2314
2315 cond_resched();
2316
2317 return progress;
2318}
2319
2320
2321static inline struct page *
2322__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
2323 struct zonelist *zonelist, enum zone_type high_zoneidx,
2324 nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
2325 int migratetype, unsigned long *did_some_progress)
2326{
2327 struct page *page = NULL;
2328 bool drained = false;
2329
2330 *did_some_progress = __perform_reclaim(gfp_mask, order, zonelist,
2331 nodemask);
2332 if (unlikely(!(*did_some_progress)))
2333 return NULL;
2334
2335
2336 if (IS_ENABLED(CONFIG_NUMA))
2337 zlc_clear_zones_full(zonelist);
2338
2339retry:
2340 page = get_page_from_freelist(gfp_mask, nodemask, order,
2341 zonelist, high_zoneidx,
2342 alloc_flags & ~ALLOC_NO_WATERMARKS,
2343 preferred_zone, migratetype);
2344
2345
2346
2347
2348
2349 if (!page && !drained) {
2350 drain_all_pages();
2351 drained = true;
2352 goto retry;
2353 }
2354
2355 return page;
2356}
2357
2358
2359
2360
2361
2362static inline struct page *
2363__alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order,
2364 struct zonelist *zonelist, enum zone_type high_zoneidx,
2365 nodemask_t *nodemask, struct zone *preferred_zone,
2366 int migratetype)
2367{
2368 struct page *page;
2369
2370 do {
2371 page = get_page_from_freelist(gfp_mask, nodemask, order,
2372 zonelist, high_zoneidx, ALLOC_NO_WATERMARKS,
2373 preferred_zone, migratetype);
2374
2375 if (!page && gfp_mask & __GFP_NOFAIL)
2376 wait_iff_congested(preferred_zone, BLK_RW_ASYNC, HZ/50);
2377 } while (!page && (gfp_mask & __GFP_NOFAIL));
2378
2379 return page;
2380}
2381
2382static void prepare_slowpath(gfp_t gfp_mask, unsigned int order,
2383 struct zonelist *zonelist,
2384 enum zone_type high_zoneidx,
2385 struct zone *preferred_zone)
2386{
2387 struct zoneref *z;
2388 struct zone *zone;
2389
2390 for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
2391 if (!(gfp_mask & __GFP_NO_KSWAPD))
2392 wakeup_kswapd(zone, order, zone_idx(preferred_zone));
2393
2394
2395
2396
2397
2398
2399 if (zone_reclaim_mode && !zone_local(preferred_zone, zone))
2400 continue;
2401 mod_zone_page_state(zone, NR_ALLOC_BATCH,
2402 high_wmark_pages(zone) -
2403 low_wmark_pages(zone) -
2404 zone_page_state(zone, NR_ALLOC_BATCH));
2405 }
2406}
2407
2408static inline int
2409gfp_to_alloc_flags(gfp_t gfp_mask)
2410{
2411 int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET;
2412 const gfp_t wait = gfp_mask & __GFP_WAIT;
2413
2414
2415 BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH);
2416
2417
2418
2419
2420
2421
2422
2423 alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH);
2424
2425 if (!wait) {
2426
2427
2428
2429
2430 if (!(gfp_mask & __GFP_NOMEMALLOC))
2431 alloc_flags |= ALLOC_HARDER;
2432
2433
2434
2435
2436 alloc_flags &= ~ALLOC_CPUSET;
2437 } else if (unlikely(rt_task(current)) && !in_interrupt())
2438 alloc_flags |= ALLOC_HARDER;
2439
2440 if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) {
2441 if (gfp_mask & __GFP_MEMALLOC)
2442 alloc_flags |= ALLOC_NO_WATERMARKS;
2443 else if (in_serving_softirq() && (current->flags & PF_MEMALLOC))
2444 alloc_flags |= ALLOC_NO_WATERMARKS;
2445 else if (!in_interrupt() &&
2446 ((current->flags & PF_MEMALLOC) ||
2447 unlikely(test_thread_flag(TIF_MEMDIE))))
2448 alloc_flags |= ALLOC_NO_WATERMARKS;
2449 }
2450#ifdef CONFIG_CMA
2451 if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
2452 alloc_flags |= ALLOC_CMA;
2453#endif
2454 return alloc_flags;
2455}
2456
2457bool gfp_pfmemalloc_allowed(gfp_t gfp_mask)
2458{
2459 return !!(gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS);
2460}
2461
2462static inline struct page *
2463__alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
2464 struct zonelist *zonelist, enum zone_type high_zoneidx,
2465 nodemask_t *nodemask, struct zone *preferred_zone,
2466 int migratetype)
2467{
2468 const gfp_t wait = gfp_mask & __GFP_WAIT;
2469 struct page *page = NULL;
2470 int alloc_flags;
2471 unsigned long pages_reclaimed = 0;
2472 unsigned long did_some_progress;
2473 bool sync_migration = false;
2474 bool deferred_compaction = false;
2475 bool contended_compaction = false;
2476
2477
2478
2479
2480
2481
2482
2483 if (order >= MAX_ORDER) {
2484 WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
2485 return NULL;
2486 }
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496 if (IS_ENABLED(CONFIG_NUMA) &&
2497 (gfp_mask & GFP_THISNODE) == GFP_THISNODE)
2498 goto nopage;
2499
2500restart:
2501 prepare_slowpath(gfp_mask, order, zonelist,
2502 high_zoneidx, preferred_zone);
2503
2504
2505
2506
2507
2508
2509 alloc_flags = gfp_to_alloc_flags(gfp_mask);
2510
2511
2512
2513
2514
2515 if (!(alloc_flags & ALLOC_CPUSET) && !nodemask)
2516 first_zones_zonelist(zonelist, high_zoneidx, NULL,
2517 &preferred_zone);
2518
2519rebalance:
2520
2521 page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
2522 high_zoneidx, alloc_flags & ~ALLOC_NO_WATERMARKS,
2523 preferred_zone, migratetype);
2524 if (page)
2525 goto got_pg;
2526
2527
2528 if (alloc_flags & ALLOC_NO_WATERMARKS) {
2529
2530
2531
2532
2533
2534 zonelist = node_zonelist(numa_node_id(), gfp_mask);
2535
2536 page = __alloc_pages_high_priority(gfp_mask, order,
2537 zonelist, high_zoneidx, nodemask,
2538 preferred_zone, migratetype);
2539 if (page) {
2540 goto got_pg;
2541 }
2542 }
2543
2544
2545 if (!wait)
2546 goto nopage;
2547
2548
2549 if (current->flags & PF_MEMALLOC)
2550 goto nopage;
2551
2552
2553 if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL))
2554 goto nopage;
2555
2556
2557
2558
2559
2560 page = __alloc_pages_direct_compact(gfp_mask, order,
2561 zonelist, high_zoneidx,
2562 nodemask,
2563 alloc_flags, preferred_zone,
2564 migratetype, sync_migration,
2565 &contended_compaction,
2566 &deferred_compaction,
2567 &did_some_progress);
2568 if (page)
2569 goto got_pg;
2570 sync_migration = true;
2571
2572
2573
2574
2575
2576
2577
2578 if ((deferred_compaction || contended_compaction) &&
2579 (gfp_mask & __GFP_NO_KSWAPD))
2580 goto nopage;
2581
2582
2583 page = __alloc_pages_direct_reclaim(gfp_mask, order,
2584 zonelist, high_zoneidx,
2585 nodemask,
2586 alloc_flags, preferred_zone,
2587 migratetype, &did_some_progress);
2588 if (page)
2589 goto got_pg;
2590
2591
2592
2593
2594
2595 if (!did_some_progress) {
2596 if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
2597 if (oom_killer_disabled)
2598 goto nopage;
2599
2600 if ((current->flags & PF_DUMPCORE) &&
2601 !(gfp_mask & __GFP_NOFAIL))
2602 goto nopage;
2603 page = __alloc_pages_may_oom(gfp_mask, order,
2604 zonelist, high_zoneidx,
2605 nodemask, preferred_zone,
2606 migratetype);
2607 if (page)
2608 goto got_pg;
2609
2610 if (!(gfp_mask & __GFP_NOFAIL)) {
2611
2612
2613
2614
2615
2616
2617 if (order > PAGE_ALLOC_COSTLY_ORDER)
2618 goto nopage;
2619
2620
2621
2622
2623
2624 if (high_zoneidx < ZONE_NORMAL)
2625 goto nopage;
2626 }
2627
2628 goto restart;
2629 }
2630 }
2631
2632
2633 pages_reclaimed += did_some_progress;
2634 if (should_alloc_retry(gfp_mask, order, did_some_progress,
2635 pages_reclaimed)) {
2636
2637 wait_iff_congested(preferred_zone, BLK_RW_ASYNC, HZ/50);
2638 goto rebalance;
2639 } else {
2640
2641
2642
2643
2644
2645 page = __alloc_pages_direct_compact(gfp_mask, order,
2646 zonelist, high_zoneidx,
2647 nodemask,
2648 alloc_flags, preferred_zone,
2649 migratetype, sync_migration,
2650 &contended_compaction,
2651 &deferred_compaction,
2652 &did_some_progress);
2653 if (page)
2654 goto got_pg;
2655 }
2656
2657nopage:
2658 warn_alloc_failed(gfp_mask, order, NULL);
2659 return page;
2660got_pg:
2661 if (kmemcheck_enabled)
2662 kmemcheck_pagealloc_alloc(page, order, gfp_mask);
2663
2664 return page;
2665}
2666
2667
2668
2669
2670struct page *
2671__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
2672 struct zonelist *zonelist, nodemask_t *nodemask)
2673{
2674 enum zone_type high_zoneidx = gfp_zone(gfp_mask);
2675 struct zone *preferred_zone;
2676 struct page *page = NULL;
2677 int migratetype = allocflags_to_migratetype(gfp_mask);
2678 unsigned int cpuset_mems_cookie;
2679 int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET;
2680 struct mem_cgroup *memcg = NULL;
2681
2682 gfp_mask &= gfp_allowed_mask;
2683
2684 lockdep_trace_alloc(gfp_mask);
2685
2686 might_sleep_if(gfp_mask & __GFP_WAIT);
2687
2688 if (should_fail_alloc_page(gfp_mask, order))
2689 return NULL;
2690
2691
2692
2693
2694
2695
2696 if (unlikely(!zonelist->_zonerefs->zone))
2697 return NULL;
2698
2699
2700
2701
2702
2703 if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order))
2704 return NULL;
2705
2706retry_cpuset:
2707 cpuset_mems_cookie = get_mems_allowed();
2708
2709
2710 first_zones_zonelist(zonelist, high_zoneidx,
2711 nodemask ? : &cpuset_current_mems_allowed,
2712 &preferred_zone);
2713 if (!preferred_zone)
2714 goto out;
2715
2716#ifdef CONFIG_CMA
2717 if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
2718 alloc_flags |= ALLOC_CMA;
2719#endif
2720
2721 page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
2722 zonelist, high_zoneidx, alloc_flags,
2723 preferred_zone, migratetype);
2724 if (unlikely(!page)) {
2725
2726
2727
2728
2729
2730 gfp_mask = memalloc_noio_flags(gfp_mask);
2731 page = __alloc_pages_slowpath(gfp_mask, order,
2732 zonelist, high_zoneidx, nodemask,
2733 preferred_zone, migratetype);
2734 }
2735
2736 trace_mm_page_alloc(page, order, gfp_mask, migratetype);
2737
2738out:
2739
2740
2741
2742
2743
2744
2745 if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
2746 goto retry_cpuset;
2747
2748 memcg_kmem_commit_charge(page, memcg, order);
2749
2750 return page;
2751}
2752EXPORT_SYMBOL(__alloc_pages_nodemask);
2753
2754
2755
2756
2757unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order)
2758{
2759 struct page *page;
2760
2761
2762
2763
2764
2765 VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0);
2766
2767 page = alloc_pages(gfp_mask, order);
2768 if (!page)
2769 return 0;
2770 return (unsigned long) page_address(page);
2771}
2772EXPORT_SYMBOL(__get_free_pages);
2773
2774unsigned long get_zeroed_page(gfp_t gfp_mask)
2775{
2776 return __get_free_pages(gfp_mask | __GFP_ZERO, 0);
2777}
2778EXPORT_SYMBOL(get_zeroed_page);
2779
2780void __free_pages(struct page *page, unsigned int order)
2781{
2782 if (put_page_testzero(page)) {
2783 if (order == 0)
2784 free_hot_cold_page(page, 0);
2785 else
2786 __free_pages_ok(page, order);
2787 }
2788}
2789
2790EXPORT_SYMBOL(__free_pages);
2791
2792void free_pages(unsigned long addr, unsigned int order)
2793{
2794 if (addr != 0) {
2795 VM_BUG_ON(!virt_addr_valid((void *)addr));
2796 __free_pages(virt_to_page((void *)addr), order);
2797 }
2798}
2799
2800EXPORT_SYMBOL(free_pages);
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813void __free_memcg_kmem_pages(struct page *page, unsigned int order)
2814{
2815 memcg_kmem_uncharge_pages(page, order);
2816 __free_pages(page, order);
2817}
2818
2819void free_memcg_kmem_pages(unsigned long addr, unsigned int order)
2820{
2821 if (addr != 0) {
2822 VM_BUG_ON(!virt_addr_valid((void *)addr));
2823 __free_memcg_kmem_pages(virt_to_page((void *)addr), order);
2824 }
2825}
2826
2827static void *make_alloc_exact(unsigned long addr, unsigned order, size_t size)
2828{
2829 if (addr) {
2830 unsigned long alloc_end = addr + (PAGE_SIZE << order);
2831 unsigned long used = addr + PAGE_ALIGN(size);
2832
2833 split_page(virt_to_page((void *)addr), order);
2834 while (used < alloc_end) {
2835 free_page(used);
2836 used += PAGE_SIZE;
2837 }
2838 }
2839 return (void *)addr;
2840}
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
2856{
2857 unsigned int order = get_order(size);
2858 unsigned long addr;
2859
2860 addr = __get_free_pages(gfp_mask, order);
2861 return make_alloc_exact(addr, order, size);
2862}
2863EXPORT_SYMBOL(alloc_pages_exact);
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
2878{
2879 unsigned order = get_order(size);
2880 struct page *p = alloc_pages_node(nid, gfp_mask, order);
2881 if (!p)
2882 return NULL;
2883 return make_alloc_exact((unsigned long)page_address(p), order, size);
2884}
2885EXPORT_SYMBOL(alloc_pages_exact_nid);
2886
2887
2888
2889
2890
2891
2892
2893
2894void free_pages_exact(void *virt, size_t size)
2895{
2896 unsigned long addr = (unsigned long)virt;
2897 unsigned long end = addr + PAGE_ALIGN(size);
2898
2899 while (addr < end) {
2900 free_page(addr);
2901 addr += PAGE_SIZE;
2902 }
2903}
2904EXPORT_SYMBOL(free_pages_exact);
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915static unsigned long nr_free_zone_pages(int offset)
2916{
2917 struct zoneref *z;
2918 struct zone *zone;
2919
2920
2921 unsigned long sum = 0;
2922
2923 struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL);
2924
2925 for_each_zone_zonelist(zone, z, zonelist, offset) {
2926 unsigned long size = zone->managed_pages;
2927 unsigned long high = high_wmark_pages(zone);
2928 if (size > high)
2929 sum += size - high;
2930 }
2931
2932 return sum;
2933}
2934
2935
2936
2937
2938
2939
2940
2941unsigned long nr_free_buffer_pages(void)
2942{
2943 return nr_free_zone_pages(gfp_zone(GFP_USER));
2944}
2945EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
2946
2947
2948
2949
2950
2951
2952
2953unsigned long nr_free_pagecache_pages(void)
2954{
2955 return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE));
2956}
2957
2958static inline void show_node(struct zone *zone)
2959{
2960 if (IS_ENABLED(CONFIG_NUMA))
2961 printk("Node %d ", zone_to_nid(zone));
2962}
2963
2964void si_meminfo(struct sysinfo *val)
2965{
2966 val->totalram = totalram_pages;
2967 val->sharedram = 0;
2968 val->freeram = global_page_state(NR_FREE_PAGES);
2969 val->bufferram = nr_blockdev_pages();
2970 val->totalhigh = totalhigh_pages;
2971 val->freehigh = nr_free_highpages();
2972 val->mem_unit = PAGE_SIZE;
2973}
2974
2975EXPORT_SYMBOL(si_meminfo);
2976
2977#ifdef CONFIG_NUMA
2978void si_meminfo_node(struct sysinfo *val, int nid)
2979{
2980 int zone_type;
2981 unsigned long managed_pages = 0;
2982 pg_data_t *pgdat = NODE_DATA(nid);
2983
2984 for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
2985 managed_pages += pgdat->node_zones[zone_type].managed_pages;
2986 val->totalram = managed_pages;
2987 val->freeram = node_page_state(nid, NR_FREE_PAGES);
2988#ifdef CONFIG_HIGHMEM
2989 val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
2990 val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
2991 NR_FREE_PAGES);
2992#else
2993 val->totalhigh = 0;
2994 val->freehigh = 0;
2995#endif
2996 val->mem_unit = PAGE_SIZE;
2997}
2998#endif
2999
3000
3001
3002
3003
3004bool skip_free_areas_node(unsigned int flags, int nid)
3005{
3006 bool ret = false;
3007 unsigned int cpuset_mems_cookie;
3008
3009 if (!(flags & SHOW_MEM_FILTER_NODES))
3010 goto out;
3011
3012 do {
3013 cpuset_mems_cookie = get_mems_allowed();
3014 ret = !node_isset(nid, cpuset_current_mems_allowed);
3015 } while (!put_mems_allowed(cpuset_mems_cookie));
3016out:
3017 return ret;
3018}
3019
3020#define K(x) ((x) << (PAGE_SHIFT-10))
3021
3022static void show_migration_types(unsigned char type)
3023{
3024 static const char types[MIGRATE_TYPES] = {
3025 [MIGRATE_UNMOVABLE] = 'U',
3026 [MIGRATE_RECLAIMABLE] = 'E',
3027 [MIGRATE_MOVABLE] = 'M',
3028 [MIGRATE_RESERVE] = 'R',
3029#ifdef CONFIG_CMA
3030 [MIGRATE_CMA] = 'C',
3031#endif
3032#ifdef CONFIG_MEMORY_ISOLATION
3033 [MIGRATE_ISOLATE] = 'I',
3034#endif
3035 };
3036 char tmp[MIGRATE_TYPES + 1];
3037 char *p = tmp;
3038 int i;
3039
3040 for (i = 0; i < MIGRATE_TYPES; i++) {
3041 if (type & (1 << i))
3042 *p++ = types[i];
3043 }
3044
3045 *p = '\0';
3046 printk("(%s) ", tmp);
3047}
3048
3049
3050
3051
3052
3053
3054
3055
3056void show_free_areas(unsigned int filter)
3057{
3058 int cpu;
3059 struct zone *zone;
3060
3061 for_each_populated_zone(zone) {
3062 if (skip_free_areas_node(filter, zone_to_nid(zone)))
3063 continue;
3064 show_node(zone);
3065 printk("%s per-cpu:\n", zone->name);
3066
3067 for_each_online_cpu(cpu) {
3068 struct per_cpu_pageset *pageset;
3069
3070 pageset = per_cpu_ptr(zone->pageset, cpu);
3071
3072 printk("CPU %4d: hi:%5d, btch:%4d usd:%4d\n",
3073 cpu, pageset->pcp.high,
3074 pageset->pcp.batch, pageset->pcp.count);
3075 }
3076 }
3077
3078 printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
3079 " active_file:%lu inactive_file:%lu isolated_file:%lu\n"
3080 " unevictable:%lu"
3081 " dirty:%lu writeback:%lu unstable:%lu\n"
3082 " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
3083 " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n"
3084 " free_cma:%lu\n",
3085 global_page_state(NR_ACTIVE_ANON),
3086 global_page_state(NR_INACTIVE_ANON),
3087 global_page_state(NR_ISOLATED_ANON),
3088 global_page_state(NR_ACTIVE_FILE),
3089 global_page_state(NR_INACTIVE_FILE),
3090 global_page_state(NR_ISOLATED_FILE),
3091 global_page_state(NR_UNEVICTABLE),
3092 global_page_state(NR_FILE_DIRTY),
3093 global_page_state(NR_WRITEBACK),
3094 global_page_state(NR_UNSTABLE_NFS),
3095 global_page_state(NR_FREE_PAGES),
3096 global_page_state(NR_SLAB_RECLAIMABLE),
3097 global_page_state(NR_SLAB_UNRECLAIMABLE),
3098 global_page_state(NR_FILE_MAPPED),
3099 global_page_state(NR_SHMEM),
3100 global_page_state(NR_PAGETABLE),
3101 global_page_state(NR_BOUNCE),
3102 global_page_state(NR_FREE_CMA_PAGES));
3103
3104 for_each_populated_zone(zone) {
3105 int i;
3106
3107 if (skip_free_areas_node(filter, zone_to_nid(zone)))
3108 continue;
3109 show_node(zone);
3110 printk("%s"
3111 " free:%lukB"
3112 " min:%lukB"
3113 " low:%lukB"
3114 " high:%lukB"
3115 " active_anon:%lukB"
3116 " inactive_anon:%lukB"
3117 " active_file:%lukB"
3118 " inactive_file:%lukB"
3119 " unevictable:%lukB"
3120 " isolated(anon):%lukB"
3121 " isolated(file):%lukB"
3122 " present:%lukB"
3123 " managed:%lukB"
3124 " mlocked:%lukB"
3125 " dirty:%lukB"
3126 " writeback:%lukB"
3127 " mapped:%lukB"
3128 " shmem:%lukB"
3129 " slab_reclaimable:%lukB"
3130 " slab_unreclaimable:%lukB"
3131 " kernel_stack:%lukB"
3132 " pagetables:%lukB"
3133 " unstable:%lukB"
3134 " bounce:%lukB"
3135 " free_cma:%lukB"
3136 " writeback_tmp:%lukB"
3137 " pages_scanned:%lu"
3138 " all_unreclaimable? %s"
3139 "\n",
3140 zone->name,
3141 K(zone_page_state(zone, NR_FREE_PAGES)),
3142 K(min_wmark_pages(zone)),
3143 K(low_wmark_pages(zone)),
3144 K(high_wmark_pages(zone)),
3145 K(zone_page_state(zone, NR_ACTIVE_ANON)),
3146 K(zone_page_state(zone, NR_INACTIVE_ANON)),
3147 K(zone_page_state(zone, NR_ACTIVE_FILE)),
3148 K(zone_page_state(zone, NR_INACTIVE_FILE)),
3149 K(zone_page_state(zone, NR_UNEVICTABLE)),
3150 K(zone_page_state(zone, NR_ISOLATED_ANON)),
3151 K(zone_page_state(zone, NR_ISOLATED_FILE)),
3152 K(zone->present_pages),
3153 K(zone->managed_pages),
3154 K(zone_page_state(zone, NR_MLOCK)),
3155 K(zone_page_state(zone, NR_FILE_DIRTY)),
3156 K(zone_page_state(zone, NR_WRITEBACK)),
3157 K(zone_page_state(zone, NR_FILE_MAPPED)),
3158 K(zone_page_state(zone, NR_SHMEM)),
3159 K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
3160 K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
3161 zone_page_state(zone, NR_KERNEL_STACK) *
3162 THREAD_SIZE / 1024,
3163 K(zone_page_state(zone, NR_PAGETABLE)),
3164 K(zone_page_state(zone, NR_UNSTABLE_NFS)),
3165 K(zone_page_state(zone, NR_BOUNCE)),
3166 K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
3167 K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
3168 zone->pages_scanned,
3169 (!zone_reclaimable(zone) ? "yes" : "no")
3170 );
3171 printk("lowmem_reserve[]:");
3172 for (i = 0; i < MAX_NR_ZONES; i++)
3173 printk(" %lu", zone->lowmem_reserve[i]);
3174 printk("\n");
3175 }
3176
3177 for_each_populated_zone(zone) {
3178 unsigned long nr[MAX_ORDER], flags, order, total = 0;
3179 unsigned char types[MAX_ORDER];
3180
3181 if (skip_free_areas_node(filter, zone_to_nid(zone)))
3182 continue;
3183 show_node(zone);
3184 printk("%s: ", zone->name);
3185
3186 spin_lock_irqsave(&zone->lock, flags);
3187 for (order = 0; order < MAX_ORDER; order++) {
3188 struct free_area *area = &zone->free_area[order];
3189 int type;
3190
3191 nr[order] = area->nr_free;
3192 total += nr[order] << order;
3193
3194 types[order] = 0;
3195 for (type = 0; type < MIGRATE_TYPES; type++) {
3196 if (!list_empty(&area->free_list[type]))
3197 types[order] |= 1 << type;
3198 }
3199 }
3200 spin_unlock_irqrestore(&zone->lock, flags);
3201 for (order = 0; order < MAX_ORDER; order++) {
3202 printk("%lu*%lukB ", nr[order], K(1UL) << order);
3203 if (nr[order])
3204 show_migration_types(types[order]);
3205 }
3206 printk("= %lukB\n", K(total));
3207 }
3208
3209 hugetlb_show_meminfo();
3210
3211 printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES));
3212
3213 show_swap_cache_info();
3214}
3215
3216static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
3217{
3218 zoneref->zone = zone;
3219 zoneref->zone_idx = zone_idx(zone);
3220}
3221
3222
3223
3224
3225
3226
3227static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist,
3228 int nr_zones)
3229{
3230 struct zone *zone;
3231 enum zone_type zone_type = MAX_NR_ZONES;
3232
3233 do {
3234 zone_type--;
3235 zone = pgdat->node_zones + zone_type;
3236 if (populated_zone(zone)) {
3237 zoneref_set_zone(zone,
3238 &zonelist->_zonerefs[nr_zones++]);
3239 check_highest_zone(zone_type);
3240 }
3241 } while (zone_type);
3242
3243 return nr_zones;
3244}
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256#define ZONELIST_ORDER_DEFAULT 0
3257#define ZONELIST_ORDER_NODE 1
3258#define ZONELIST_ORDER_ZONE 2
3259
3260
3261
3262
3263static int current_zonelist_order = ZONELIST_ORDER_DEFAULT;
3264static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"};
3265
3266
3267#ifdef CONFIG_NUMA
3268
3269static int user_zonelist_order = ZONELIST_ORDER_DEFAULT;
3270
3271#define NUMA_ZONELIST_ORDER_LEN 16
3272char numa_zonelist_order[16] = "default";
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282static int __parse_numa_zonelist_order(char *s)
3283{
3284 if (*s == 'd' || *s == 'D') {
3285 user_zonelist_order = ZONELIST_ORDER_DEFAULT;
3286 } else if (*s == 'n' || *s == 'N') {
3287 user_zonelist_order = ZONELIST_ORDER_NODE;
3288 } else if (*s == 'z' || *s == 'Z') {
3289 user_zonelist_order = ZONELIST_ORDER_ZONE;
3290 } else {
3291 printk(KERN_WARNING
3292 "Ignoring invalid numa_zonelist_order value: "
3293 "%s\n", s);
3294 return -EINVAL;
3295 }
3296 return 0;
3297}
3298
3299static __init int setup_numa_zonelist_order(char *s)
3300{
3301 int ret;
3302
3303 if (!s)
3304 return 0;
3305
3306 ret = __parse_numa_zonelist_order(s);
3307 if (ret == 0)
3308 strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN);
3309
3310 return ret;
3311}
3312early_param("numa_zonelist_order", setup_numa_zonelist_order);
3313
3314
3315
3316
3317int numa_zonelist_order_handler(ctl_table *table, int write,
3318 void __user *buffer, size_t *length,
3319 loff_t *ppos)
3320{
3321 char saved_string[NUMA_ZONELIST_ORDER_LEN];
3322 int ret;
3323 static DEFINE_MUTEX(zl_order_mutex);
3324
3325 mutex_lock(&zl_order_mutex);
3326 if (write) {
3327 if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) {
3328 ret = -EINVAL;
3329 goto out;
3330 }
3331 strcpy(saved_string, (char *)table->data);
3332 }
3333 ret = proc_dostring(table, write, buffer, length, ppos);
3334 if (ret)
3335 goto out;
3336 if (write) {
3337 int oldval = user_zonelist_order;
3338
3339 ret = __parse_numa_zonelist_order((char *)table->data);
3340 if (ret) {
3341
3342
3343
3344 strncpy((char *)table->data, saved_string,
3345 NUMA_ZONELIST_ORDER_LEN);
3346 user_zonelist_order = oldval;
3347 } else if (oldval != user_zonelist_order) {
3348 mutex_lock(&zonelists_mutex);
3349 build_all_zonelists(NULL, NULL);
3350 mutex_unlock(&zonelists_mutex);
3351 }
3352 }
3353out:
3354 mutex_unlock(&zl_order_mutex);
3355 return ret;
3356}
3357
3358
3359#define MAX_NODE_LOAD (nr_online_nodes)
3360static int node_load[MAX_NUMNODES];
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376static int find_next_best_node(int node, nodemask_t *used_node_mask)
3377{
3378 int n, val;
3379 int min_val = INT_MAX;
3380 int best_node = NUMA_NO_NODE;
3381 const struct cpumask *tmp = cpumask_of_node(0);
3382
3383
3384 if (!node_isset(node, *used_node_mask)) {
3385 node_set(node, *used_node_mask);
3386 return node;
3387 }
3388
3389 for_each_node_state(n, N_MEMORY) {
3390
3391
3392 if (node_isset(n, *used_node_mask))
3393 continue;
3394
3395
3396 val = node_distance(node, n);
3397
3398
3399 val += (n < node);
3400
3401
3402 tmp = cpumask_of_node(n);
3403 if (!cpumask_empty(tmp))
3404 val += PENALTY_FOR_NODE_WITH_CPUS;
3405
3406
3407 val *= (MAX_NODE_LOAD*MAX_NUMNODES);
3408 val += node_load[n];
3409
3410 if (val < min_val) {
3411 min_val = val;
3412 best_node = n;
3413 }
3414 }
3415
3416 if (best_node >= 0)
3417 node_set(best_node, *used_node_mask);
3418
3419 return best_node;
3420}
3421
3422
3423
3424
3425
3426
3427
3428static void build_zonelists_in_node_order(pg_data_t *pgdat, int node)
3429{
3430 int j;
3431 struct zonelist *zonelist;
3432
3433 zonelist = &pgdat->node_zonelists[0];
3434 for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++)
3435 ;
3436 j = build_zonelists_node(NODE_DATA(node), zonelist, j);
3437 zonelist->_zonerefs[j].zone = NULL;
3438 zonelist->_zonerefs[j].zone_idx = 0;
3439}
3440
3441
3442
3443
3444static void build_thisnode_zonelists(pg_data_t *pgdat)
3445{
3446 int j;
3447 struct zonelist *zonelist;
3448
3449 zonelist = &pgdat->node_zonelists[1];
3450 j = build_zonelists_node(pgdat, zonelist, 0);
3451 zonelist->_zonerefs[j].zone = NULL;
3452 zonelist->_zonerefs[j].zone_idx = 0;
3453}
3454
3455
3456
3457
3458
3459
3460
3461static int node_order[MAX_NUMNODES];
3462
3463static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes)
3464{
3465 int pos, j, node;
3466 int zone_type;
3467 struct zone *z;
3468 struct zonelist *zonelist;
3469
3470 zonelist = &pgdat->node_zonelists[0];
3471 pos = 0;
3472 for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) {
3473 for (j = 0; j < nr_nodes; j++) {
3474 node = node_order[j];
3475 z = &NODE_DATA(node)->node_zones[zone_type];
3476 if (populated_zone(z)) {
3477 zoneref_set_zone(z,
3478 &zonelist->_zonerefs[pos++]);
3479 check_highest_zone(zone_type);
3480 }
3481 }
3482 }
3483 zonelist->_zonerefs[pos].zone = NULL;
3484 zonelist->_zonerefs[pos].zone_idx = 0;
3485}
3486
3487static int default_zonelist_order(void)
3488{
3489 int nid, zone_type;
3490 unsigned long low_kmem_size, total_size;
3491 struct zone *z;
3492 int average_size;
3493
3494
3495
3496
3497
3498
3499
3500 low_kmem_size = 0;
3501 total_size = 0;
3502 for_each_online_node(nid) {
3503 for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
3504 z = &NODE_DATA(nid)->node_zones[zone_type];
3505 if (populated_zone(z)) {
3506 if (zone_type < ZONE_NORMAL)
3507 low_kmem_size += z->managed_pages;
3508 total_size += z->managed_pages;
3509 } else if (zone_type == ZONE_NORMAL) {
3510
3511
3512
3513
3514
3515
3516
3517 return ZONELIST_ORDER_NODE;
3518 }
3519 }
3520 }
3521 if (!low_kmem_size ||
3522 low_kmem_size > total_size/2)
3523 return ZONELIST_ORDER_NODE;
3524
3525
3526
3527
3528
3529 average_size = total_size /
3530 (nodes_weight(node_states[N_MEMORY]) + 1);
3531 for_each_online_node(nid) {
3532 low_kmem_size = 0;
3533 total_size = 0;
3534 for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
3535 z = &NODE_DATA(nid)->node_zones[zone_type];
3536 if (populated_zone(z)) {
3537 if (zone_type < ZONE_NORMAL)
3538 low_kmem_size += z->present_pages;
3539 total_size += z->present_pages;
3540 }
3541 }
3542 if (low_kmem_size &&
3543 total_size > average_size &&
3544 low_kmem_size > total_size * 70/100)
3545 return ZONELIST_ORDER_NODE;
3546 }
3547 return ZONELIST_ORDER_ZONE;
3548}
3549
3550static void set_zonelist_order(void)
3551{
3552 if (user_zonelist_order == ZONELIST_ORDER_DEFAULT)
3553 current_zonelist_order = default_zonelist_order();
3554 else
3555 current_zonelist_order = user_zonelist_order;
3556}
3557
3558static void build_zonelists(pg_data_t *pgdat)
3559{
3560 int j, node, load;
3561 enum zone_type i;
3562 nodemask_t used_mask;
3563 int local_node, prev_node;
3564 struct zonelist *zonelist;
3565 int order = current_zonelist_order;
3566
3567
3568 for (i = 0; i < MAX_ZONELISTS; i++) {
3569 zonelist = pgdat->node_zonelists + i;
3570 zonelist->_zonerefs[0].zone = NULL;
3571 zonelist->_zonerefs[0].zone_idx = 0;
3572 }
3573
3574
3575 local_node = pgdat->node_id;
3576 load = nr_online_nodes;
3577 prev_node = local_node;
3578 nodes_clear(used_mask);
3579
3580 memset(node_order, 0, sizeof(node_order));
3581 j = 0;
3582
3583 while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
3584
3585
3586
3587
3588
3589 if (node_distance(local_node, node) !=
3590 node_distance(local_node, prev_node))
3591 node_load[node] = load;
3592
3593 prev_node = node;
3594 load--;
3595 if (order == ZONELIST_ORDER_NODE)
3596 build_zonelists_in_node_order(pgdat, node);
3597 else
3598 node_order[j++] = node;
3599 }
3600
3601 if (order == ZONELIST_ORDER_ZONE) {
3602
3603 build_zonelists_in_zone_order(pgdat, j);
3604 }
3605
3606 build_thisnode_zonelists(pgdat);
3607}
3608
3609
3610static void build_zonelist_cache(pg_data_t *pgdat)
3611{
3612 struct zonelist *zonelist;
3613 struct zonelist_cache *zlc;
3614 struct zoneref *z;
3615
3616 zonelist = &pgdat->node_zonelists[0];
3617 zonelist->zlcache_ptr = zlc = &zonelist->zlcache;
3618 bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
3619 for (z = zonelist->_zonerefs; z->zone; z++)
3620 zlc->z_to_n[z - zonelist->_zonerefs] = zonelist_node_idx(z);
3621}
3622
3623#ifdef CONFIG_HAVE_MEMORYLESS_NODES
3624
3625
3626
3627
3628
3629
3630int local_memory_node(int node)
3631{
3632 struct zone *zone;
3633
3634 (void)first_zones_zonelist(node_zonelist(node, GFP_KERNEL),
3635 gfp_zone(GFP_KERNEL),
3636 NULL,
3637 &zone);
3638 return zone->node;
3639}
3640#endif
3641
3642#else
3643
3644static void set_zonelist_order(void)
3645{
3646 current_zonelist_order = ZONELIST_ORDER_ZONE;
3647}
3648
3649static void build_zonelists(pg_data_t *pgdat)
3650{
3651 int node, local_node;
3652 enum zone_type j;
3653 struct zonelist *zonelist;
3654
3655 local_node = pgdat->node_id;
3656
3657 zonelist = &pgdat->node_zonelists[0];
3658 j = build_zonelists_node(pgdat, zonelist, 0);
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668 for (node = local_node + 1; node < MAX_NUMNODES; node++) {
3669 if (!node_online(node))
3670 continue;
3671 j = build_zonelists_node(NODE_DATA(node), zonelist, j);
3672 }
3673 for (node = 0; node < local_node; node++) {
3674 if (!node_online(node))
3675 continue;
3676 j = build_zonelists_node(NODE_DATA(node), zonelist, j);
3677 }
3678
3679 zonelist->_zonerefs[j].zone = NULL;
3680 zonelist->_zonerefs[j].zone_idx = 0;
3681}
3682
3683
3684static void build_zonelist_cache(pg_data_t *pgdat)
3685{
3686 pgdat->node_zonelists[0].zlcache_ptr = NULL;
3687}
3688
3689#endif
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
3707static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
3708static void setup_zone_pageset(struct zone *zone);
3709
3710
3711
3712
3713
3714DEFINE_MUTEX(zonelists_mutex);
3715
3716
3717static int __build_all_zonelists(void *data)
3718{
3719 int nid;
3720 int cpu;
3721 pg_data_t *self = data;
3722
3723#ifdef CONFIG_NUMA
3724 memset(node_load, 0, sizeof(node_load));
3725#endif
3726
3727 if (self && !node_online(self->node_id)) {
3728 build_zonelists(self);
3729 build_zonelist_cache(self);
3730 }
3731
3732 for_each_online_node(nid) {
3733 pg_data_t *pgdat = NODE_DATA(nid);
3734
3735 build_zonelists(pgdat);
3736 build_zonelist_cache(pgdat);
3737 }
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752 for_each_possible_cpu(cpu) {
3753 setup_pageset(&per_cpu(boot_pageset, cpu), 0);
3754
3755#ifdef CONFIG_HAVE_MEMORYLESS_NODES
3756
3757
3758
3759
3760
3761
3762
3763
3764 if (cpu_online(cpu))
3765 set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu)));
3766#endif
3767 }
3768
3769 return 0;
3770}
3771
3772
3773
3774
3775
3776void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone)
3777{
3778 set_zonelist_order();
3779
3780 if (system_state == SYSTEM_BOOTING) {
3781 __build_all_zonelists(NULL);
3782 mminit_verify_zonelist();
3783 cpuset_init_current_mems_allowed();
3784 } else {
3785#ifdef CONFIG_MEMORY_HOTPLUG
3786 if (zone)
3787 setup_zone_pageset(zone);
3788#endif
3789
3790
3791 stop_machine(__build_all_zonelists, pgdat, NULL);
3792
3793 }
3794 vm_total_pages = nr_free_pagecache_pages();
3795
3796
3797
3798
3799
3800
3801
3802 if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES))
3803 page_group_by_mobility_disabled = 1;
3804 else
3805 page_group_by_mobility_disabled = 0;
3806
3807 printk("Built %i zonelists in %s order, mobility grouping %s. "
3808 "Total pages: %ld\n",
3809 nr_online_nodes,
3810 zonelist_order_name[current_zonelist_order],
3811 page_group_by_mobility_disabled ? "off" : "on",
3812 vm_total_pages);
3813#ifdef CONFIG_NUMA
3814 printk("Policy zone: %s\n", zone_names[policy_zone]);
3815#endif
3816}
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829#define PAGES_PER_WAITQUEUE 256
3830
3831#ifndef CONFIG_MEMORY_HOTPLUG
3832static inline unsigned long wait_table_hash_nr_entries(unsigned long pages)
3833{
3834 unsigned long size = 1;
3835
3836 pages /= PAGES_PER_WAITQUEUE;
3837
3838 while (size < pages)
3839 size <<= 1;
3840
3841
3842
3843
3844
3845
3846 size = min(size, 4096UL);
3847
3848 return max(size, 4UL);
3849}
3850#else
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868static inline unsigned long wait_table_hash_nr_entries(unsigned long pages)
3869{
3870 return 4096UL;
3871}
3872#endif
3873
3874
3875
3876
3877
3878
3879static inline unsigned long wait_table_bits(unsigned long size)
3880{
3881 return ffz(~size);
3882}
3883
3884#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
3885
3886
3887
3888
3889static int pageblock_is_reserved(unsigned long start_pfn, unsigned long end_pfn)
3890{
3891 unsigned long pfn;
3892
3893 for (pfn = start_pfn; pfn < end_pfn; pfn++) {
3894 if (!pfn_valid_within(pfn) || PageReserved(pfn_to_page(pfn)))
3895 return 1;
3896 }
3897 return 0;
3898}
3899
3900
3901
3902
3903
3904
3905
3906
3907static void setup_zone_migrate_reserve(struct zone *zone)
3908{
3909 unsigned long start_pfn, pfn, end_pfn, block_end_pfn;
3910 struct page *page;
3911 unsigned long block_migratetype;
3912 int reserve;
3913
3914
3915
3916
3917
3918
3919
3920 start_pfn = zone->zone_start_pfn;
3921 end_pfn = zone_end_pfn(zone);
3922 start_pfn = roundup(start_pfn, pageblock_nr_pages);
3923 reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >>
3924 pageblock_order;
3925
3926
3927
3928
3929
3930
3931
3932
3933 reserve = min(2, reserve);
3934
3935 for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
3936 if (!pfn_valid(pfn))
3937 continue;
3938 page = pfn_to_page(pfn);
3939
3940
3941 if (page_to_nid(page) != zone_to_nid(zone))
3942 continue;
3943
3944 block_migratetype = get_pageblock_migratetype(page);
3945
3946
3947 if (reserve > 0) {
3948
3949
3950
3951
3952 block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
3953 if (pageblock_is_reserved(pfn, block_end_pfn))
3954 continue;
3955
3956
3957 if (block_migratetype == MIGRATE_RESERVE) {
3958 reserve--;
3959 continue;
3960 }
3961
3962
3963 if (block_migratetype == MIGRATE_MOVABLE) {
3964 set_pageblock_migratetype(page,
3965 MIGRATE_RESERVE);
3966 move_freepages_block(zone, page,
3967 MIGRATE_RESERVE);
3968 reserve--;
3969 continue;
3970 }
3971 }
3972
3973
3974
3975
3976
3977 if (block_migratetype == MIGRATE_RESERVE) {
3978 set_pageblock_migratetype(page, MIGRATE_MOVABLE);
3979 move_freepages_block(zone, page, MIGRATE_MOVABLE);
3980 }
3981 }
3982}
3983
3984
3985
3986
3987
3988
3989void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
3990 unsigned long start_pfn, enum memmap_context context)
3991{
3992 struct page *page;
3993 unsigned long end_pfn = start_pfn + size;
3994 unsigned long pfn;
3995 struct zone *z;
3996
3997 if (highest_memmap_pfn < end_pfn - 1)
3998 highest_memmap_pfn = end_pfn - 1;
3999
4000 z = &NODE_DATA(nid)->node_zones[zone];
4001 for (pfn = start_pfn; pfn < end_pfn; pfn++) {
4002
4003
4004
4005
4006
4007 if (context == MEMMAP_EARLY) {
4008 if (!early_pfn_valid(pfn))
4009 continue;
4010 if (!early_pfn_in_nid(pfn, nid))
4011 continue;
4012 }
4013 page = pfn_to_page(pfn);
4014 set_page_links(page, zone, nid, pfn);
4015 mminit_verify_page_links(page, zone, nid, pfn);
4016 init_page_count(page);
4017 page_mapcount_reset(page);
4018 page_nid_reset_last(page);
4019 SetPageReserved(page);
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034 if ((z->zone_start_pfn <= pfn)
4035 && (pfn < zone_end_pfn(z))
4036 && !(pfn & (pageblock_nr_pages - 1)))
4037 set_pageblock_migratetype(page, MIGRATE_MOVABLE);
4038
4039 INIT_LIST_HEAD(&page->lru);
4040#ifdef WANT_PAGE_VIRTUAL
4041
4042 if (!is_highmem_idx(zone))
4043 set_page_address(page, __va(pfn << PAGE_SHIFT));
4044#endif
4045 }
4046}
4047
4048static void __meminit zone_init_free_lists(struct zone *zone)
4049{
4050 int order, t;
4051 for_each_migratetype_order(order, t) {
4052 INIT_LIST_HEAD(&zone->free_area[order].free_list[t]);
4053 zone->free_area[order].nr_free = 0;
4054 }
4055}
4056
4057#ifndef __HAVE_ARCH_MEMMAP_INIT
4058#define memmap_init(size, nid, zone, start_pfn) \
4059 memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY)
4060#endif
4061
4062static int __meminit zone_batchsize(struct zone *zone)
4063{
4064#ifdef CONFIG_MMU
4065 int batch;
4066
4067
4068
4069
4070
4071
4072
4073 batch = zone->managed_pages / 1024;
4074 if (batch * PAGE_SIZE > 512 * 1024)
4075 batch = (512 * 1024) / PAGE_SIZE;
4076 batch /= 4;
4077 if (batch < 1)
4078 batch = 1;
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090 batch = rounddown_pow_of_two(batch + batch/2) - 1;
4091
4092 return batch;
4093
4094#else
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108 return 0;
4109#endif
4110}
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125static void pageset_update(struct per_cpu_pages *pcp, unsigned long high,
4126 unsigned long batch)
4127{
4128
4129 pcp->batch = 1;
4130 smp_wmb();
4131
4132
4133 pcp->high = high;
4134 smp_wmb();
4135
4136 pcp->batch = batch;
4137}
4138
4139
4140static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch)
4141{
4142 pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch));
4143}
4144
4145static void pageset_init(struct per_cpu_pageset *p)
4146{
4147 struct per_cpu_pages *pcp;
4148 int migratetype;
4149
4150 memset(p, 0, sizeof(*p));
4151
4152 pcp = &p->pcp;
4153 pcp->count = 0;
4154 for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++)
4155 INIT_LIST_HEAD(&pcp->lists[migratetype]);
4156}
4157
4158static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
4159{
4160 pageset_init(p);
4161 pageset_set_batch(p, batch);
4162}
4163
4164
4165
4166
4167
4168static void pageset_set_high(struct per_cpu_pageset *p,
4169 unsigned long high)
4170{
4171 unsigned long batch = max(1UL, high / 4);
4172 if ((high / 4) > (PAGE_SHIFT * 8))
4173 batch = PAGE_SHIFT * 8;
4174
4175 pageset_update(&p->pcp, high, batch);
4176}
4177
4178static void __meminit pageset_set_high_and_batch(struct zone *zone,
4179 struct per_cpu_pageset *pcp)
4180{
4181 if (percpu_pagelist_fraction)
4182 pageset_set_high(pcp,
4183 (zone->managed_pages /
4184 percpu_pagelist_fraction));
4185 else
4186 pageset_set_batch(pcp, zone_batchsize(zone));
4187}
4188
4189static void __meminit zone_pageset_init(struct zone *zone, int cpu)
4190{
4191 struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu);
4192
4193 pageset_init(pcp);
4194 pageset_set_high_and_batch(zone, pcp);
4195}
4196
4197static void __meminit setup_zone_pageset(struct zone *zone)
4198{
4199 int cpu;
4200 zone->pageset = alloc_percpu(struct per_cpu_pageset);
4201 for_each_possible_cpu(cpu)
4202 zone_pageset_init(zone, cpu);
4203}
4204
4205
4206
4207
4208
4209void __init setup_per_cpu_pageset(void)
4210{
4211 struct zone *zone;
4212
4213 for_each_populated_zone(zone)
4214 setup_zone_pageset(zone);
4215}
4216
4217static noinline __init_refok
4218int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
4219{
4220 int i;
4221 struct pglist_data *pgdat = zone->zone_pgdat;
4222 size_t alloc_size;
4223
4224
4225
4226
4227
4228 zone->wait_table_hash_nr_entries =
4229 wait_table_hash_nr_entries(zone_size_pages);
4230 zone->wait_table_bits =
4231 wait_table_bits(zone->wait_table_hash_nr_entries);
4232 alloc_size = zone->wait_table_hash_nr_entries
4233 * sizeof(wait_queue_head_t);
4234
4235 if (!slab_is_available()) {
4236 zone->wait_table = (wait_queue_head_t *)
4237 alloc_bootmem_node_nopanic(pgdat, alloc_size);
4238 } else {
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249 zone->wait_table = vmalloc(alloc_size);
4250 }
4251 if (!zone->wait_table)
4252 return -ENOMEM;
4253
4254 for (i = 0; i < zone->wait_table_hash_nr_entries; ++i)
4255 init_waitqueue_head(zone->wait_table + i);
4256
4257 return 0;
4258}
4259
4260static __meminit void zone_pcp_init(struct zone *zone)
4261{
4262
4263
4264
4265
4266
4267 zone->pageset = &boot_pageset;
4268
4269 if (zone->present_pages)
4270 printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n",
4271 zone->name, zone->present_pages,
4272 zone_batchsize(zone));
4273}
4274
4275int __meminit init_currently_empty_zone(struct zone *zone,
4276 unsigned long zone_start_pfn,
4277 unsigned long size,
4278 enum memmap_context context)
4279{
4280 struct pglist_data *pgdat = zone->zone_pgdat;
4281 int ret;
4282 ret = zone_wait_table_init(zone, size);
4283 if (ret)
4284 return ret;
4285 pgdat->nr_zones = zone_idx(zone) + 1;
4286
4287 zone->zone_start_pfn = zone_start_pfn;
4288
4289 mminit_dprintk(MMINIT_TRACE, "memmap_init",
4290 "Initialising map node %d zone %lu pfns %lu -> %lu\n",
4291 pgdat->node_id,
4292 (unsigned long)zone_idx(zone),
4293 zone_start_pfn, (zone_start_pfn + size));
4294
4295 zone_init_free_lists(zone);
4296
4297 return 0;
4298}
4299
4300#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
4301#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
4302
4303
4304
4305
4306
4307
4308int __meminit __early_pfn_to_nid(unsigned long pfn)
4309{
4310 unsigned long start_pfn, end_pfn;
4311 int nid;
4312
4313
4314
4315
4316 static unsigned long __meminitdata last_start_pfn, last_end_pfn;
4317 static int __meminitdata last_nid;
4318
4319 if (last_start_pfn <= pfn && pfn < last_end_pfn)
4320 return last_nid;
4321
4322 nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
4323 if (nid != -1) {
4324 last_start_pfn = start_pfn;
4325 last_end_pfn = end_pfn;
4326 last_nid = nid;
4327 }
4328
4329 return nid;
4330}
4331#endif
4332
4333int __meminit early_pfn_to_nid(unsigned long pfn)
4334{
4335 int nid;
4336
4337 nid = __early_pfn_to_nid(pfn);
4338 if (nid >= 0)
4339 return nid;
4340
4341 return 0;
4342}
4343
4344#ifdef CONFIG_NODES_SPAN_OTHER_NODES
4345bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
4346{
4347 int nid;
4348
4349 nid = __early_pfn_to_nid(pfn);
4350 if (nid >= 0 && nid != node)
4351 return false;
4352 return true;
4353}
4354#endif
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn)
4366{
4367 unsigned long start_pfn, end_pfn;
4368 int i, this_nid;
4369
4370 for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) {
4371 start_pfn = min(start_pfn, max_low_pfn);
4372 end_pfn = min(end_pfn, max_low_pfn);
4373
4374 if (start_pfn < end_pfn)
4375 free_bootmem_node(NODE_DATA(this_nid),
4376 PFN_PHYS(start_pfn),
4377 (end_pfn - start_pfn) << PAGE_SHIFT);
4378 }
4379}
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389void __init sparse_memory_present_with_active_regions(int nid)
4390{
4391 unsigned long start_pfn, end_pfn;
4392 int i, this_nid;
4393
4394 for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid)
4395 memory_present(this_nid, start_pfn, end_pfn);
4396}
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409void __meminit get_pfn_range_for_nid(unsigned int nid,
4410 unsigned long *start_pfn, unsigned long *end_pfn)
4411{
4412 unsigned long this_start_pfn, this_end_pfn;
4413 int i;
4414
4415 *start_pfn = -1UL;
4416 *end_pfn = 0;
4417
4418 for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) {
4419 *start_pfn = min(*start_pfn, this_start_pfn);
4420 *end_pfn = max(*end_pfn, this_end_pfn);
4421 }
4422
4423 if (*start_pfn == -1UL)
4424 *start_pfn = 0;
4425}
4426
4427
4428
4429
4430
4431
4432static void __init find_usable_zone_for_movable(void)
4433{
4434 int zone_index;
4435 for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) {
4436 if (zone_index == ZONE_MOVABLE)
4437 continue;
4438
4439 if (arch_zone_highest_possible_pfn[zone_index] >
4440 arch_zone_lowest_possible_pfn[zone_index])
4441 break;
4442 }
4443
4444 VM_BUG_ON(zone_index == -1);
4445 movable_zone = zone_index;
4446}
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458static void __meminit adjust_zone_range_for_zone_movable(int nid,
4459 unsigned long zone_type,
4460 unsigned long node_start_pfn,
4461 unsigned long node_end_pfn,
4462 unsigned long *zone_start_pfn,
4463 unsigned long *zone_end_pfn)
4464{
4465
4466 if (zone_movable_pfn[nid]) {
4467
4468 if (zone_type == ZONE_MOVABLE) {
4469 *zone_start_pfn = zone_movable_pfn[nid];
4470 *zone_end_pfn = min(node_end_pfn,
4471 arch_zone_highest_possible_pfn[movable_zone]);
4472
4473
4474 } else if (*zone_start_pfn < zone_movable_pfn[nid] &&
4475 *zone_end_pfn > zone_movable_pfn[nid]) {
4476 *zone_end_pfn = zone_movable_pfn[nid];
4477
4478
4479 } else if (*zone_start_pfn >= zone_movable_pfn[nid])
4480 *zone_start_pfn = *zone_end_pfn;
4481 }
4482}
4483
4484
4485
4486
4487
4488static unsigned long __meminit zone_spanned_pages_in_node(int nid,
4489 unsigned long zone_type,
4490 unsigned long node_start_pfn,
4491 unsigned long node_end_pfn,
4492 unsigned long *ignored)
4493{
4494 unsigned long zone_start_pfn, zone_end_pfn;
4495
4496
4497 zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
4498 zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
4499 adjust_zone_range_for_zone_movable(nid, zone_type,
4500 node_start_pfn, node_end_pfn,
4501 &zone_start_pfn, &zone_end_pfn);
4502
4503
4504 if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn)
4505 return 0;
4506
4507
4508 zone_end_pfn = min(zone_end_pfn, node_end_pfn);
4509 zone_start_pfn = max(zone_start_pfn, node_start_pfn);
4510
4511
4512 return zone_end_pfn - zone_start_pfn;
4513}
4514
4515
4516
4517
4518
4519unsigned long __meminit __absent_pages_in_range(int nid,
4520 unsigned long range_start_pfn,
4521 unsigned long range_end_pfn)
4522{
4523 unsigned long nr_absent = range_end_pfn - range_start_pfn;
4524 unsigned long start_pfn, end_pfn;
4525 int i;
4526
4527 for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
4528 start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
4529 end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
4530 nr_absent -= end_pfn - start_pfn;
4531 }
4532 return nr_absent;
4533}
4534
4535
4536
4537
4538
4539
4540
4541
4542unsigned long __init absent_pages_in_range(unsigned long start_pfn,
4543 unsigned long end_pfn)
4544{
4545 return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn);
4546}
4547
4548
4549static unsigned long __meminit zone_absent_pages_in_node(int nid,
4550 unsigned long zone_type,
4551 unsigned long node_start_pfn,
4552 unsigned long node_end_pfn,
4553 unsigned long *ignored)
4554{
4555 unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type];
4556 unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
4557 unsigned long zone_start_pfn, zone_end_pfn;
4558
4559 zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
4560 zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);
4561
4562 adjust_zone_range_for_zone_movable(nid, zone_type,
4563 node_start_pfn, node_end_pfn,
4564 &zone_start_pfn, &zone_end_pfn);
4565 return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
4566}
4567
4568#else
4569static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
4570 unsigned long zone_type,
4571 unsigned long node_start_pfn,
4572 unsigned long node_end_pfn,
4573 unsigned long *zones_size)
4574{
4575 return zones_size[zone_type];
4576}
4577
4578static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
4579 unsigned long zone_type,
4580 unsigned long node_start_pfn,
4581 unsigned long node_end_pfn,
4582 unsigned long *zholes_size)
4583{
4584 if (!zholes_size)
4585 return 0;
4586
4587 return zholes_size[zone_type];
4588}
4589
4590#endif
4591
4592static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
4593 unsigned long node_start_pfn,
4594 unsigned long node_end_pfn,
4595 unsigned long *zones_size,
4596 unsigned long *zholes_size)
4597{
4598 unsigned long realtotalpages, totalpages = 0;
4599 enum zone_type i;
4600
4601 for (i = 0; i < MAX_NR_ZONES; i++)
4602 totalpages += zone_spanned_pages_in_node(pgdat->node_id, i,
4603 node_start_pfn,
4604 node_end_pfn,
4605 zones_size);
4606 pgdat->node_spanned_pages = totalpages;
4607
4608 realtotalpages = totalpages;
4609 for (i = 0; i < MAX_NR_ZONES; i++)
4610 realtotalpages -=
4611 zone_absent_pages_in_node(pgdat->node_id, i,
4612 node_start_pfn, node_end_pfn,
4613 zholes_size);
4614 pgdat->node_present_pages = realtotalpages;
4615 printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id,
4616 realtotalpages);
4617}
4618
4619#ifndef CONFIG_SPARSEMEM
4620
4621
4622
4623
4624
4625
4626
4627static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize)
4628{
4629 unsigned long usemapsize;
4630
4631 zonesize += zone_start_pfn & (pageblock_nr_pages-1);
4632 usemapsize = roundup(zonesize, pageblock_nr_pages);
4633 usemapsize = usemapsize >> pageblock_order;
4634 usemapsize *= NR_PAGEBLOCK_BITS;
4635 usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long));
4636
4637 return usemapsize / 8;
4638}
4639
4640static void __init setup_usemap(struct pglist_data *pgdat,
4641 struct zone *zone,
4642 unsigned long zone_start_pfn,
4643 unsigned long zonesize)
4644{
4645 unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize);
4646 zone->pageblock_flags = NULL;
4647 if (usemapsize)
4648 zone->pageblock_flags = alloc_bootmem_node_nopanic(pgdat,
4649 usemapsize);
4650}
4651#else
4652static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone,
4653 unsigned long zone_start_pfn, unsigned long zonesize) {}
4654#endif
4655
4656#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
4657
4658
4659void __paginginit set_pageblock_order(void)
4660{
4661 unsigned int order;
4662
4663
4664 if (pageblock_order)
4665 return;
4666
4667 if (HPAGE_SHIFT > PAGE_SHIFT)
4668 order = HUGETLB_PAGE_ORDER;
4669 else
4670 order = MAX_ORDER - 1;
4671
4672
4673
4674
4675
4676
4677 pageblock_order = order;
4678}
4679#else
4680
4681
4682
4683
4684
4685
4686
4687void __paginginit set_pageblock_order(void)
4688{
4689}
4690
4691#endif
4692
4693static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages,
4694 unsigned long present_pages)
4695{
4696 unsigned long pages = spanned_pages;
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706 if (spanned_pages > present_pages + (present_pages >> 4) &&
4707 IS_ENABLED(CONFIG_SPARSEMEM))
4708 pages = present_pages;
4709
4710 return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT;
4711}
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721static void __paginginit free_area_init_core(struct pglist_data *pgdat,
4722 unsigned long node_start_pfn, unsigned long node_end_pfn,
4723 unsigned long *zones_size, unsigned long *zholes_size)
4724{
4725 enum zone_type j;
4726 int nid = pgdat->node_id;
4727 unsigned long zone_start_pfn = pgdat->node_start_pfn;
4728 int ret;
4729
4730 pgdat_resize_init(pgdat);
4731#ifdef CONFIG_NUMA_BALANCING
4732 spin_lock_init(&pgdat->numabalancing_migrate_lock);
4733 pgdat->numabalancing_migrate_nr_pages = 0;
4734 pgdat->numabalancing_migrate_next_window = jiffies;
4735#endif
4736 init_waitqueue_head(&pgdat->kswapd_wait);
4737 init_waitqueue_head(&pgdat->pfmemalloc_wait);
4738 pgdat_page_cgroup_init(pgdat);
4739
4740 for (j = 0; j < MAX_NR_ZONES; j++) {
4741 struct zone *zone = pgdat->node_zones + j;
4742 unsigned long size, realsize, freesize, memmap_pages;
4743
4744 size = zone_spanned_pages_in_node(nid, j, node_start_pfn,
4745 node_end_pfn, zones_size);
4746 realsize = freesize = size - zone_absent_pages_in_node(nid, j,
4747 node_start_pfn,
4748 node_end_pfn,
4749 zholes_size);
4750
4751
4752
4753
4754
4755
4756 memmap_pages = calc_memmap_size(size, realsize);
4757 if (freesize >= memmap_pages) {
4758 freesize -= memmap_pages;
4759 if (memmap_pages)
4760 printk(KERN_DEBUG
4761 " %s zone: %lu pages used for memmap\n",
4762 zone_names[j], memmap_pages);
4763 } else
4764 printk(KERN_WARNING
4765 " %s zone: %lu pages exceeds freesize %lu\n",
4766 zone_names[j], memmap_pages, freesize);
4767
4768
4769 if (j == 0 && freesize > dma_reserve) {
4770 freesize -= dma_reserve;
4771 printk(KERN_DEBUG " %s zone: %lu pages reserved\n",
4772 zone_names[0], dma_reserve);
4773 }
4774
4775 if (!is_highmem_idx(j))
4776 nr_kernel_pages += freesize;
4777
4778 else if (nr_kernel_pages > memmap_pages * 2)
4779 nr_kernel_pages -= memmap_pages;
4780 nr_all_pages += freesize;
4781
4782 zone->spanned_pages = size;
4783 zone->present_pages = realsize;
4784
4785
4786
4787
4788
4789 zone->managed_pages = is_highmem_idx(j) ? realsize : freesize;
4790#ifdef CONFIG_NUMA
4791 zone->node = nid;
4792 zone->min_unmapped_pages = (freesize*sysctl_min_unmapped_ratio)
4793 / 100;
4794 zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100;
4795#endif
4796 zone->name = zone_names[j];
4797 spin_lock_init(&zone->lock);
4798 spin_lock_init(&zone->lru_lock);
4799 zone_seqlock_init(zone);
4800 zone->zone_pgdat = pgdat;
4801 zone_pcp_init(zone);
4802
4803
4804 mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages);
4805
4806 lruvec_init(&zone->lruvec);
4807 if (!size)
4808 continue;
4809
4810 set_pageblock_order();
4811 setup_usemap(pgdat, zone, zone_start_pfn, size);
4812 ret = init_currently_empty_zone(zone, zone_start_pfn,
4813 size, MEMMAP_EARLY);
4814 BUG_ON(ret);
4815 memmap_init(size, nid, j, zone_start_pfn);
4816 zone_start_pfn += size;
4817 }
4818}
4819
4820static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
4821{
4822
4823 if (!pgdat->node_spanned_pages)
4824 return;
4825
4826#ifdef CONFIG_FLAT_NODE_MEM_MAP
4827
4828 if (!pgdat->node_mem_map) {
4829 unsigned long size, start, end;
4830 struct page *map;
4831
4832
4833
4834
4835
4836
4837 start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
4838 end = pgdat_end_pfn(pgdat);
4839 end = ALIGN(end, MAX_ORDER_NR_PAGES);
4840 size = (end - start) * sizeof(struct page);
4841 map = alloc_remap(pgdat->node_id, size);
4842 if (!map)
4843 map = alloc_bootmem_node_nopanic(pgdat, size);
4844 pgdat->node_mem_map = map + (pgdat->node_start_pfn - start);
4845 }
4846#ifndef CONFIG_NEED_MULTIPLE_NODES
4847
4848
4849
4850 if (pgdat == NODE_DATA(0)) {
4851 mem_map = NODE_DATA(0)->node_mem_map;
4852#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
4853 if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
4854 mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
4855#endif
4856 }
4857#endif
4858#endif
4859}
4860
4861void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
4862 unsigned long node_start_pfn, unsigned long *zholes_size)
4863{
4864 pg_data_t *pgdat = NODE_DATA(nid);
4865 unsigned long start_pfn = 0;
4866 unsigned long end_pfn = 0;
4867
4868
4869 WARN_ON(pgdat->nr_zones || pgdat->classzone_idx);
4870
4871 pgdat->node_id = nid;
4872 pgdat->node_start_pfn = node_start_pfn;
4873 init_zone_allows_reclaim(nid);
4874#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
4875 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
4876#endif
4877 calculate_node_totalpages(pgdat, start_pfn, end_pfn,
4878 zones_size, zholes_size);
4879
4880 alloc_node_mem_map(pgdat);
4881#ifdef CONFIG_FLAT_NODE_MEM_MAP
4882 printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n",
4883 nid, (unsigned long)pgdat,
4884 (unsigned long)pgdat->node_mem_map);
4885#endif
4886
4887 free_area_init_core(pgdat, start_pfn, end_pfn,
4888 zones_size, zholes_size);
4889}
4890
4891#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
4892
4893#if MAX_NUMNODES > 1
4894
4895
4896
4897void __init setup_nr_node_ids(void)
4898{
4899 unsigned int node;
4900 unsigned int highest = 0;
4901
4902 for_each_node_mask(node, node_possible_map)
4903 highest = node;
4904 nr_node_ids = highest + 1;
4905}
4906#endif
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927unsigned long __init node_map_pfn_alignment(void)
4928{
4929 unsigned long accl_mask = 0, last_end = 0;
4930 unsigned long start, end, mask;
4931 int last_nid = -1;
4932 int i, nid;
4933
4934 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) {
4935 if (!start || last_nid < 0 || last_nid == nid) {
4936 last_nid = nid;
4937 last_end = end;
4938 continue;
4939 }
4940
4941
4942
4943
4944
4945
4946 mask = ~((1 << __ffs(start)) - 1);
4947 while (mask && last_end <= (start & (mask << 1)))
4948 mask <<= 1;
4949
4950
4951 accl_mask |= mask;
4952 }
4953
4954
4955 return ~accl_mask + 1;
4956}
4957
4958
4959static unsigned long __init find_min_pfn_for_node(int nid)
4960{
4961 unsigned long min_pfn = ULONG_MAX;
4962 unsigned long start_pfn;
4963 int i;
4964
4965 for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL)
4966 min_pfn = min(min_pfn, start_pfn);
4967
4968 if (min_pfn == ULONG_MAX) {
4969 printk(KERN_WARNING
4970 "Could not find start_pfn for node %d\n", nid);
4971 return 0;
4972 }
4973
4974 return min_pfn;
4975}
4976
4977
4978
4979
4980
4981
4982
4983unsigned long __init find_min_pfn_with_active_regions(void)
4984{
4985 return find_min_pfn_for_node(MAX_NUMNODES);
4986}
4987
4988
4989
4990
4991
4992
4993static unsigned long __init early_calculate_totalpages(void)
4994{
4995 unsigned long totalpages = 0;
4996 unsigned long start_pfn, end_pfn;
4997 int i, nid;
4998
4999 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
5000 unsigned long pages = end_pfn - start_pfn;
5001
5002 totalpages += pages;
5003 if (pages)
5004 node_set_state(nid, N_MEMORY);
5005 }
5006 return totalpages;
5007}
5008
5009
5010
5011
5012
5013
5014
5015static void __init find_zone_movable_pfns_for_nodes(void)
5016{
5017 int i, nid;
5018 unsigned long usable_startpfn;
5019 unsigned long kernelcore_node, kernelcore_remaining;
5020
5021 nodemask_t saved_node_state = node_states[N_MEMORY];
5022 unsigned long totalpages = early_calculate_totalpages();
5023 int usable_nodes = nodes_weight(node_states[N_MEMORY]);
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033 if (required_movablecore) {
5034 unsigned long corepages;
5035
5036
5037
5038
5039
5040 required_movablecore =
5041 roundup(required_movablecore, MAX_ORDER_NR_PAGES);
5042 corepages = totalpages - required_movablecore;
5043
5044 required_kernelcore = max(required_kernelcore, corepages);
5045 }
5046
5047
5048 if (!required_kernelcore)
5049 goto out;
5050
5051
5052 find_usable_zone_for_movable();
5053 usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone];
5054
5055restart:
5056
5057 kernelcore_node = required_kernelcore / usable_nodes;
5058 for_each_node_state(nid, N_MEMORY) {
5059 unsigned long start_pfn, end_pfn;
5060
5061
5062
5063
5064
5065
5066 if (required_kernelcore < kernelcore_node)
5067 kernelcore_node = required_kernelcore / usable_nodes;
5068
5069
5070
5071
5072
5073
5074 kernelcore_remaining = kernelcore_node;
5075
5076
5077 for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
5078 unsigned long size_pages;
5079
5080 start_pfn = max(start_pfn, zone_movable_pfn[nid]);
5081 if (start_pfn >= end_pfn)
5082 continue;
5083
5084
5085 if (start_pfn < usable_startpfn) {
5086 unsigned long kernel_pages;
5087 kernel_pages = min(end_pfn, usable_startpfn)
5088 - start_pfn;
5089
5090 kernelcore_remaining -= min(kernel_pages,
5091 kernelcore_remaining);
5092 required_kernelcore -= min(kernel_pages,
5093 required_kernelcore);
5094
5095
5096 if (end_pfn <= usable_startpfn) {
5097
5098
5099
5100
5101
5102
5103
5104 zone_movable_pfn[nid] = end_pfn;
5105 continue;
5106 }
5107 start_pfn = usable_startpfn;
5108 }
5109
5110
5111
5112
5113
5114
5115 size_pages = end_pfn - start_pfn;
5116 if (size_pages > kernelcore_remaining)
5117 size_pages = kernelcore_remaining;
5118 zone_movable_pfn[nid] = start_pfn + size_pages;
5119
5120
5121
5122
5123
5124
5125 required_kernelcore -= min(required_kernelcore,
5126 size_pages);
5127 kernelcore_remaining -= size_pages;
5128 if (!kernelcore_remaining)
5129 break;
5130 }
5131 }
5132
5133
5134
5135
5136
5137
5138
5139 usable_nodes--;
5140 if (usable_nodes && required_kernelcore > usable_nodes)
5141 goto restart;
5142
5143
5144 for (nid = 0; nid < MAX_NUMNODES; nid++)
5145 zone_movable_pfn[nid] =
5146 roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES);
5147
5148out:
5149
5150 node_states[N_MEMORY] = saved_node_state;
5151}
5152
5153
5154static void check_for_memory(pg_data_t *pgdat, int nid)
5155{
5156 enum zone_type zone_type;
5157
5158 if (N_MEMORY == N_NORMAL_MEMORY)
5159 return;
5160
5161 for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) {
5162 struct zone *zone = &pgdat->node_zones[zone_type];
5163 if (zone->present_pages) {
5164 node_set_state(nid, N_HIGH_MEMORY);
5165 if (N_NORMAL_MEMORY != N_HIGH_MEMORY &&
5166 zone_type <= ZONE_NORMAL)
5167 node_set_state(nid, N_NORMAL_MEMORY);
5168 break;
5169 }
5170 }
5171}
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186void __init free_area_init_nodes(unsigned long *max_zone_pfn)
5187{
5188 unsigned long start_pfn, end_pfn;
5189 int i, nid;
5190
5191
5192 memset(arch_zone_lowest_possible_pfn, 0,
5193 sizeof(arch_zone_lowest_possible_pfn));
5194 memset(arch_zone_highest_possible_pfn, 0,
5195 sizeof(arch_zone_highest_possible_pfn));
5196 arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions();
5197 arch_zone_highest_possible_pfn[0] = max_zone_pfn[0];
5198 for (i = 1; i < MAX_NR_ZONES; i++) {
5199 if (i == ZONE_MOVABLE)
5200 continue;
5201 arch_zone_lowest_possible_pfn[i] =
5202 arch_zone_highest_possible_pfn[i-1];
5203 arch_zone_highest_possible_pfn[i] =
5204 max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]);
5205 }
5206 arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0;
5207 arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0;
5208
5209
5210 memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn));
5211 find_zone_movable_pfns_for_nodes();
5212
5213
5214 printk("Zone ranges:\n");
5215 for (i = 0; i < MAX_NR_ZONES; i++) {
5216 if (i == ZONE_MOVABLE)
5217 continue;
5218 printk(KERN_CONT " %-8s ", zone_names[i]);
5219 if (arch_zone_lowest_possible_pfn[i] ==
5220 arch_zone_highest_possible_pfn[i])
5221 printk(KERN_CONT "empty\n");
5222 else
5223 printk(KERN_CONT "[mem %0#10lx-%0#10lx]\n",
5224 arch_zone_lowest_possible_pfn[i] << PAGE_SHIFT,
5225 (arch_zone_highest_possible_pfn[i]
5226 << PAGE_SHIFT) - 1);
5227 }
5228
5229
5230 printk("Movable zone start for each node\n");
5231 for (i = 0; i < MAX_NUMNODES; i++) {
5232 if (zone_movable_pfn[i])
5233 printk(" Node %d: %#010lx\n", i,
5234 zone_movable_pfn[i] << PAGE_SHIFT);
5235 }
5236
5237
5238 printk("Early memory node ranges\n");
5239 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
5240 printk(" node %3d: [mem %#010lx-%#010lx]\n", nid,
5241 start_pfn << PAGE_SHIFT, (end_pfn << PAGE_SHIFT) - 1);
5242
5243
5244 mminit_verify_pageflags_layout();
5245 setup_nr_node_ids();
5246 for_each_online_node(nid) {
5247 pg_data_t *pgdat = NODE_DATA(nid);
5248 free_area_init_node(nid, NULL,
5249 find_min_pfn_for_node(nid), NULL);
5250
5251
5252 if (pgdat->node_present_pages)
5253 node_set_state(nid, N_MEMORY);
5254 check_for_memory(pgdat, nid);
5255 }
5256}
5257
5258static int __init cmdline_parse_core(char *p, unsigned long *core)
5259{
5260 unsigned long long coremem;
5261 if (!p)
5262 return -EINVAL;
5263
5264 coremem = memparse(p, &p);
5265 *core = coremem >> PAGE_SHIFT;
5266
5267
5268 WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX);
5269
5270 return 0;
5271}
5272
5273
5274
5275
5276
5277static int __init cmdline_parse_kernelcore(char *p)
5278{
5279 return cmdline_parse_core(p, &required_kernelcore);
5280}
5281
5282
5283
5284
5285
5286static int __init cmdline_parse_movablecore(char *p)
5287{
5288 return cmdline_parse_core(p, &required_movablecore);
5289}
5290
5291early_param("kernelcore", cmdline_parse_kernelcore);
5292early_param("movablecore", cmdline_parse_movablecore);
5293
5294#endif
5295
5296void adjust_managed_page_count(struct page *page, long count)
5297{
5298 spin_lock(&managed_page_count_lock);
5299 page_zone(page)->managed_pages += count;
5300 totalram_pages += count;
5301#ifdef CONFIG_HIGHMEM
5302 if (PageHighMem(page))
5303 totalhigh_pages += count;
5304#endif
5305 spin_unlock(&managed_page_count_lock);
5306}
5307EXPORT_SYMBOL(adjust_managed_page_count);
5308
5309unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
5310{
5311 void *pos;
5312 unsigned long pages = 0;
5313
5314 start = (void *)PAGE_ALIGN((unsigned long)start);
5315 end = (void *)((unsigned long)end & PAGE_MASK);
5316 for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
5317 if ((unsigned int)poison <= 0xFF)
5318 memset(pos, poison, PAGE_SIZE);
5319 free_reserved_page(virt_to_page(pos));
5320 }
5321
5322 if (pages && s)
5323 pr_info("Freeing %s memory: %ldK (%p - %p)\n",
5324 s, pages << (PAGE_SHIFT - 10), start, end);
5325
5326 return pages;
5327}
5328EXPORT_SYMBOL(free_reserved_area);
5329
5330#ifdef CONFIG_HIGHMEM
5331void free_highmem_page(struct page *page)
5332{
5333 __free_reserved_page(page);
5334 totalram_pages++;
5335 page_zone(page)->managed_pages++;
5336 totalhigh_pages++;
5337}
5338#endif
5339
5340
5341void __init mem_init_print_info(const char *str)
5342{
5343 unsigned long physpages, codesize, datasize, rosize, bss_size;
5344 unsigned long init_code_size, init_data_size;
5345
5346 physpages = get_num_physpages();
5347 codesize = _etext - _stext;
5348 datasize = _edata - _sdata;
5349 rosize = __end_rodata - __start_rodata;
5350 bss_size = __bss_stop - __bss_start;
5351 init_data_size = __init_end - __init_begin;
5352 init_code_size = _einittext - _sinittext;
5353
5354
5355
5356
5357
5358
5359
5360
5361#define adj_init_size(start, end, size, pos, adj) \
5362 do { \
5363 if (start <= pos && pos < end && size > adj) \
5364 size -= adj; \
5365 } while (0)
5366
5367 adj_init_size(__init_begin, __init_end, init_data_size,
5368 _sinittext, init_code_size);
5369 adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
5370 adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
5371 adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
5372 adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
5373
5374#undef adj_init_size
5375
5376 printk("Memory: %luK/%luK available "
5377 "(%luK kernel code, %luK rwdata, %luK rodata, "
5378 "%luK init, %luK bss, %luK reserved"
5379#ifdef CONFIG_HIGHMEM
5380 ", %luK highmem"
5381#endif
5382 "%s%s)\n",
5383 nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10),
5384 codesize >> 10, datasize >> 10, rosize >> 10,
5385 (init_data_size + init_code_size) >> 10, bss_size >> 10,
5386 (physpages - totalram_pages) << (PAGE_SHIFT-10),
5387#ifdef CONFIG_HIGHMEM
5388 totalhigh_pages << (PAGE_SHIFT-10),
5389#endif
5390 str ? ", " : "", str ? str : "");
5391}
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404void __init set_dma_reserve(unsigned long new_dma_reserve)
5405{
5406 dma_reserve = new_dma_reserve;
5407}
5408
5409void __init free_area_init(unsigned long *zones_size)
5410{
5411 free_area_init_node(0, zones_size,
5412 __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL);
5413}
5414
5415static int page_alloc_cpu_notify(struct notifier_block *self,
5416 unsigned long action, void *hcpu)
5417{
5418 int cpu = (unsigned long)hcpu;
5419
5420 if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
5421 lru_add_drain_cpu(cpu);
5422 drain_pages(cpu);
5423
5424
5425
5426
5427
5428
5429
5430 vm_events_fold_cpu(cpu);
5431
5432
5433
5434
5435
5436
5437
5438
5439 cpu_vm_stats_fold(cpu);
5440 }
5441 return NOTIFY_OK;
5442}
5443
5444void __init page_alloc_init(void)
5445{
5446 hotcpu_notifier(page_alloc_cpu_notify, 0);
5447}
5448
5449
5450
5451
5452
5453static void calculate_totalreserve_pages(void)
5454{
5455 struct pglist_data *pgdat;
5456 unsigned long reserve_pages = 0;
5457 enum zone_type i, j;
5458
5459 for_each_online_pgdat(pgdat) {
5460 for (i = 0; i < MAX_NR_ZONES; i++) {
5461 struct zone *zone = pgdat->node_zones + i;
5462 unsigned long max = 0;
5463
5464
5465 for (j = i; j < MAX_NR_ZONES; j++) {
5466 if (zone->lowmem_reserve[j] > max)
5467 max = zone->lowmem_reserve[j];
5468 }
5469
5470
5471 max += high_wmark_pages(zone);
5472
5473 if (max > zone->managed_pages)
5474 max = zone->managed_pages;
5475 reserve_pages += max;
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485 zone->dirty_balance_reserve = max;
5486 }
5487 }
5488 dirty_balance_reserve = reserve_pages;
5489 totalreserve_pages = reserve_pages;
5490}
5491
5492
5493
5494
5495
5496
5497
5498static void setup_per_zone_lowmem_reserve(void)
5499{
5500 struct pglist_data *pgdat;
5501 enum zone_type j, idx;
5502
5503 for_each_online_pgdat(pgdat) {
5504 for (j = 0; j < MAX_NR_ZONES; j++) {
5505 struct zone *zone = pgdat->node_zones + j;
5506 unsigned long managed_pages = zone->managed_pages;
5507
5508 zone->lowmem_reserve[j] = 0;
5509
5510 idx = j;
5511 while (idx) {
5512 struct zone *lower_zone;
5513
5514 idx--;
5515
5516 if (sysctl_lowmem_reserve_ratio[idx] < 1)
5517 sysctl_lowmem_reserve_ratio[idx] = 1;
5518
5519 lower_zone = pgdat->node_zones + idx;
5520 lower_zone->lowmem_reserve[j] = managed_pages /
5521 sysctl_lowmem_reserve_ratio[idx];
5522 managed_pages += lower_zone->managed_pages;
5523 }
5524 }
5525 }
5526
5527
5528 calculate_totalreserve_pages();
5529}
5530
5531static void __setup_per_zone_wmarks(void)
5532{
5533 unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10);
5534 unsigned long lowmem_pages = 0;
5535 struct zone *zone;
5536 unsigned long flags;
5537
5538
5539 for_each_zone(zone) {
5540 if (!is_highmem(zone))
5541 lowmem_pages += zone->managed_pages;
5542 }
5543
5544 for_each_zone(zone) {
5545 u64 tmp;
5546
5547 spin_lock_irqsave(&zone->lock, flags);
5548 tmp = (u64)pages_min * zone->managed_pages;
5549 do_div(tmp, lowmem_pages);
5550 if (is_highmem(zone)) {
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560 unsigned long min_pages;
5561
5562 min_pages = zone->managed_pages / 1024;
5563 min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL);
5564 zone->watermark[WMARK_MIN] = min_pages;
5565 } else {
5566
5567
5568
5569
5570 zone->watermark[WMARK_MIN] = tmp;
5571 }
5572
5573 zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2);
5574 zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1);
5575
5576 __mod_zone_page_state(zone, NR_ALLOC_BATCH,
5577 high_wmark_pages(zone) -
5578 low_wmark_pages(zone) -
5579 zone_page_state(zone, NR_ALLOC_BATCH));
5580
5581 setup_zone_migrate_reserve(zone);
5582 spin_unlock_irqrestore(&zone->lock, flags);
5583 }
5584
5585
5586 calculate_totalreserve_pages();
5587}
5588
5589
5590
5591
5592
5593
5594
5595
5596void setup_per_zone_wmarks(void)
5597{
5598 mutex_lock(&zonelists_mutex);
5599 __setup_per_zone_wmarks();
5600 mutex_unlock(&zonelists_mutex);
5601}
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
5625{
5626 unsigned int gb, ratio;
5627
5628
5629 gb = zone->managed_pages >> (30 - PAGE_SHIFT);
5630 if (gb)
5631 ratio = int_sqrt(10 * gb);
5632 else
5633 ratio = 1;
5634
5635 zone->inactive_ratio = ratio;
5636}
5637
5638static void __meminit setup_per_zone_inactive_ratio(void)
5639{
5640 struct zone *zone;
5641
5642 for_each_zone(zone)
5643 calculate_zone_inactive_ratio(zone);
5644}
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670int __meminit init_per_zone_wmark_min(void)
5671{
5672 unsigned long lowmem_kbytes;
5673 int new_min_free_kbytes;
5674
5675 lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10);
5676 new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16);
5677
5678 if (new_min_free_kbytes > user_min_free_kbytes) {
5679 min_free_kbytes = new_min_free_kbytes;
5680 if (min_free_kbytes < 128)
5681 min_free_kbytes = 128;
5682 if (min_free_kbytes > 65536)
5683 min_free_kbytes = 65536;
5684 } else {
5685 pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n",
5686 new_min_free_kbytes, user_min_free_kbytes);
5687 }
5688 setup_per_zone_wmarks();
5689 refresh_zone_stat_thresholds();
5690 setup_per_zone_lowmem_reserve();
5691 setup_per_zone_inactive_ratio();
5692 return 0;
5693}
5694module_init(init_per_zone_wmark_min)
5695
5696
5697
5698
5699
5700
5701int min_free_kbytes_sysctl_handler(ctl_table *table, int write,
5702 void __user *buffer, size_t *length, loff_t *ppos)
5703{
5704 proc_dointvec(table, write, buffer, length, ppos);
5705 if (write) {
5706 user_min_free_kbytes = min_free_kbytes;
5707 setup_per_zone_wmarks();
5708 }
5709 return 0;
5710}
5711
5712#ifdef CONFIG_NUMA
5713int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write,
5714 void __user *buffer, size_t *length, loff_t *ppos)
5715{
5716 struct zone *zone;
5717 int rc;
5718
5719 rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
5720 if (rc)
5721 return rc;
5722
5723 for_each_zone(zone)
5724 zone->min_unmapped_pages = (zone->managed_pages *
5725 sysctl_min_unmapped_ratio) / 100;
5726 return 0;
5727}
5728
5729int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write,
5730 void __user *buffer, size_t *length, loff_t *ppos)
5731{
5732 struct zone *zone;
5733 int rc;
5734
5735 rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
5736 if (rc)
5737 return rc;
5738
5739 for_each_zone(zone)
5740 zone->min_slab_pages = (zone->managed_pages *
5741 sysctl_min_slab_ratio) / 100;
5742 return 0;
5743}
5744#endif
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write,
5756 void __user *buffer, size_t *length, loff_t *ppos)
5757{
5758 proc_dointvec_minmax(table, write, buffer, length, ppos);
5759 setup_per_zone_lowmem_reserve();
5760 return 0;
5761}
5762
5763
5764
5765
5766
5767
5768int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
5769 void __user *buffer, size_t *length, loff_t *ppos)
5770{
5771 struct zone *zone;
5772 unsigned int cpu;
5773 int ret;
5774
5775 ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
5776 if (!write || (ret < 0))
5777 return ret;
5778
5779 mutex_lock(&pcp_batch_high_lock);
5780 for_each_populated_zone(zone) {
5781 unsigned long high;
5782 high = zone->managed_pages / percpu_pagelist_fraction;
5783 for_each_possible_cpu(cpu)
5784 pageset_set_high(per_cpu_ptr(zone->pageset, cpu),
5785 high);
5786 }
5787 mutex_unlock(&pcp_batch_high_lock);
5788 return 0;
5789}
5790
5791int hashdist = HASHDIST_DEFAULT;
5792
5793#ifdef CONFIG_NUMA
5794static int __init set_hashdist(char *str)
5795{
5796 if (!str)
5797 return 0;
5798 hashdist = simple_strtoul(str, &str, 0);
5799 return 1;
5800}
5801__setup("hashdist=", set_hashdist);
5802#endif
5803
5804
5805
5806
5807
5808
5809
5810void *__init alloc_large_system_hash(const char *tablename,
5811 unsigned long bucketsize,
5812 unsigned long numentries,
5813 int scale,
5814 int flags,
5815 unsigned int *_hash_shift,
5816 unsigned int *_hash_mask,
5817 unsigned long low_limit,
5818 unsigned long high_limit)
5819{
5820 unsigned long long max = high_limit;
5821 unsigned long log2qty, size;
5822 void *table = NULL;
5823
5824
5825 if (!numentries) {
5826
5827 numentries = nr_kernel_pages;
5828
5829
5830 if (PAGE_SHIFT < 20)
5831 numentries = round_up(numentries, (1<<20)/PAGE_SIZE);
5832
5833
5834 if (scale > PAGE_SHIFT)
5835 numentries >>= (scale - PAGE_SHIFT);
5836 else
5837 numentries <<= (PAGE_SHIFT - scale);
5838
5839
5840 if (unlikely(flags & HASH_SMALL)) {
5841
5842 WARN_ON(!(flags & HASH_EARLY));
5843 if (!(numentries >> *_hash_shift)) {
5844 numentries = 1UL << *_hash_shift;
5845 BUG_ON(!numentries);
5846 }
5847 } else if (unlikely((numentries * bucketsize) < PAGE_SIZE))
5848 numentries = PAGE_SIZE / bucketsize;
5849 }
5850 numentries = roundup_pow_of_two(numentries);
5851
5852
5853 if (max == 0) {
5854 max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
5855 do_div(max, bucketsize);
5856 }
5857 max = min(max, 0x80000000ULL);
5858
5859 if (numentries < low_limit)
5860 numentries = low_limit;
5861 if (numentries > max)
5862 numentries = max;
5863
5864 log2qty = ilog2(numentries);
5865
5866 do {
5867 size = bucketsize << log2qty;
5868 if (flags & HASH_EARLY)
5869 table = alloc_bootmem_nopanic(size);
5870 else if (hashdist)
5871 table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
5872 else {
5873
5874
5875
5876
5877
5878 if (get_order(size) < MAX_ORDER) {
5879 table = alloc_pages_exact(size, GFP_ATOMIC);
5880 kmemleak_alloc(table, size, 1, GFP_ATOMIC);
5881 }
5882 }
5883 } while (!table && size > PAGE_SIZE && --log2qty);
5884
5885 if (!table)
5886 panic("Failed to allocate %s hash table\n", tablename);
5887
5888 printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n",
5889 tablename,
5890 (1UL << log2qty),
5891 ilog2(size) - PAGE_SHIFT,
5892 size);
5893
5894 if (_hash_shift)
5895 *_hash_shift = log2qty;
5896 if (_hash_mask)
5897 *_hash_mask = (1 << log2qty) - 1;
5898
5899 return table;
5900}
5901
5902
5903static inline unsigned long *get_pageblock_bitmap(struct zone *zone,
5904 unsigned long pfn)
5905{
5906#ifdef CONFIG_SPARSEMEM
5907 return __pfn_to_section(pfn)->pageblock_flags;
5908#else
5909 return zone->pageblock_flags;
5910#endif
5911}
5912
5913static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn)
5914{
5915#ifdef CONFIG_SPARSEMEM
5916 pfn &= (PAGES_PER_SECTION-1);
5917 return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
5918#else
5919 pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages);
5920 return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
5921#endif
5922}
5923
5924
5925
5926
5927
5928
5929
5930
5931unsigned long get_pageblock_flags_group(struct page *page,
5932 int start_bitidx, int end_bitidx)
5933{
5934 struct zone *zone;
5935 unsigned long *bitmap;
5936 unsigned long pfn, bitidx;
5937 unsigned long flags = 0;
5938 unsigned long value = 1;
5939
5940 zone = page_zone(page);
5941 pfn = page_to_pfn(page);
5942 bitmap = get_pageblock_bitmap(zone, pfn);
5943 bitidx = pfn_to_bitidx(zone, pfn);
5944
5945 for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
5946 if (test_bit(bitidx + start_bitidx, bitmap))
5947 flags |= value;
5948
5949 return flags;
5950}
5951
5952
5953
5954
5955
5956
5957
5958
5959void set_pageblock_flags_group(struct page *page, unsigned long flags,
5960 int start_bitidx, int end_bitidx)
5961{
5962 struct zone *zone;
5963 unsigned long *bitmap;
5964 unsigned long pfn, bitidx;
5965 unsigned long value = 1;
5966
5967 zone = page_zone(page);
5968 pfn = page_to_pfn(page);
5969 bitmap = get_pageblock_bitmap(zone, pfn);
5970 bitidx = pfn_to_bitidx(zone, pfn);
5971 VM_BUG_ON(!zone_spans_pfn(zone, pfn));
5972
5973 for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
5974 if (flags & value)
5975 __set_bit(bitidx + start_bitidx, bitmap);
5976 else
5977 __clear_bit(bitidx + start_bitidx, bitmap);
5978}
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
5989 bool skip_hwpoisoned_pages)
5990{
5991 unsigned long pfn, iter, found;
5992 int mt;
5993
5994
5995
5996
5997
5998 if (zone_idx(zone) == ZONE_MOVABLE)
5999 return false;
6000 mt = get_pageblock_migratetype(page);
6001 if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt))
6002 return false;
6003
6004 pfn = page_to_pfn(page);
6005 for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) {
6006 unsigned long check = pfn + iter;
6007
6008 if (!pfn_valid_within(check))
6009 continue;
6010
6011 page = pfn_to_page(check);
6012
6013
6014
6015
6016
6017
6018 if (PageHuge(page)) {
6019 iter = round_up(iter + 1, 1<<compound_order(page)) - 1;
6020 continue;
6021 }
6022
6023
6024
6025
6026
6027
6028
6029 if (!atomic_read(&page->_count)) {
6030 if (PageBuddy(page))
6031 iter += (1 << page_order(page)) - 1;
6032 continue;
6033 }
6034
6035
6036
6037
6038
6039 if (skip_hwpoisoned_pages && PageHWPoison(page))
6040 continue;
6041
6042 if (!PageLRU(page))
6043 found++;
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057 if (found > count)
6058 return true;
6059 }
6060 return false;
6061}
6062
6063bool is_pageblock_removable_nolock(struct page *page)
6064{
6065 struct zone *zone;
6066 unsigned long pfn;
6067
6068
6069
6070
6071
6072
6073
6074
6075 if (!node_online(page_to_nid(page)))
6076 return false;
6077
6078 zone = page_zone(page);
6079 pfn = page_to_pfn(page);
6080 if (!zone_spans_pfn(zone, pfn))
6081 return false;
6082
6083 return !has_unmovable_pages(zone, page, 0, true);
6084}
6085
6086#ifdef CONFIG_CMA
6087
6088static unsigned long pfn_max_align_down(unsigned long pfn)
6089{
6090 return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES,
6091 pageblock_nr_pages) - 1);
6092}
6093
6094static unsigned long pfn_max_align_up(unsigned long pfn)
6095{
6096 return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES,
6097 pageblock_nr_pages));
6098}
6099
6100
6101static int __alloc_contig_migrate_range(struct compact_control *cc,
6102 unsigned long start, unsigned long end)
6103{
6104
6105 unsigned long nr_reclaimed;
6106 unsigned long pfn = start;
6107 unsigned int tries = 0;
6108 int ret = 0;
6109
6110 migrate_prep();
6111
6112 while (pfn < end || !list_empty(&cc->migratepages)) {
6113 if (fatal_signal_pending(current)) {
6114 ret = -EINTR;
6115 break;
6116 }
6117
6118 if (list_empty(&cc->migratepages)) {
6119 cc->nr_migratepages = 0;
6120 pfn = isolate_migratepages_range(cc->zone, cc,
6121 pfn, end, true);
6122 if (!pfn) {
6123 ret = -EINTR;
6124 break;
6125 }
6126 tries = 0;
6127 } else if (++tries == 5) {
6128 ret = ret < 0 ? ret : -EBUSY;
6129 break;
6130 }
6131
6132 nr_reclaimed = reclaim_clean_pages_from_list(cc->zone,
6133 &cc->migratepages);
6134 cc->nr_migratepages -= nr_reclaimed;
6135
6136 ret = migrate_pages(&cc->migratepages, alloc_migrate_target,
6137 0, MIGRATE_SYNC, MR_CMA);
6138 }
6139 if (ret < 0) {
6140 putback_movable_pages(&cc->migratepages);
6141 return ret;
6142 }
6143 return 0;
6144}
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166int alloc_contig_range(unsigned long start, unsigned long end,
6167 unsigned migratetype)
6168{
6169 unsigned long outer_start, outer_end;
6170 int ret = 0, order;
6171
6172 struct compact_control cc = {
6173 .nr_migratepages = 0,
6174 .order = -1,
6175 .zone = page_zone(pfn_to_page(start)),
6176 .sync = true,
6177 .ignore_skip_hint = true,
6178 };
6179 INIT_LIST_HEAD(&cc.migratepages);
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205 ret = start_isolate_page_range(pfn_max_align_down(start),
6206 pfn_max_align_up(end), migratetype,
6207 false);
6208 if (ret)
6209 return ret;
6210
6211 ret = __alloc_contig_migrate_range(&cc, start, end);
6212 if (ret)
6213 goto done;
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232 lru_add_drain_all();
6233 drain_all_pages();
6234
6235 order = 0;
6236 outer_start = start;
6237 while (!PageBuddy(pfn_to_page(outer_start))) {
6238 if (++order >= MAX_ORDER) {
6239 ret = -EBUSY;
6240 goto done;
6241 }
6242 outer_start &= ~0UL << order;
6243 }
6244
6245
6246 if (test_pages_isolated(outer_start, end, false)) {
6247 pr_warn("alloc_contig_range test_pages_isolated(%lx, %lx) failed\n",
6248 outer_start, end);
6249 ret = -EBUSY;
6250 goto done;
6251 }
6252
6253
6254
6255 outer_end = isolate_freepages_range(&cc, outer_start, end);
6256 if (!outer_end) {
6257 ret = -EBUSY;
6258 goto done;
6259 }
6260
6261
6262 if (start != outer_start)
6263 free_contig_range(outer_start, start - outer_start);
6264 if (end != outer_end)
6265 free_contig_range(end, outer_end - end);
6266
6267done:
6268 undo_isolate_page_range(pfn_max_align_down(start),
6269 pfn_max_align_up(end), migratetype);
6270 return ret;
6271}
6272
6273void free_contig_range(unsigned long pfn, unsigned nr_pages)
6274{
6275 unsigned int count = 0;
6276
6277 for (; nr_pages--; pfn++) {
6278 struct page *page = pfn_to_page(pfn);
6279
6280 count += page_count(page) != 1;
6281 __free_page(page);
6282 }
6283 WARN(count != 0, "%d pages are still in use!\n", count);
6284}
6285#endif
6286
6287#ifdef CONFIG_MEMORY_HOTPLUG
6288
6289
6290
6291
6292void __meminit zone_pcp_update(struct zone *zone)
6293{
6294 unsigned cpu;
6295 mutex_lock(&pcp_batch_high_lock);
6296 for_each_possible_cpu(cpu)
6297 pageset_set_high_and_batch(zone,
6298 per_cpu_ptr(zone->pageset, cpu));
6299 mutex_unlock(&pcp_batch_high_lock);
6300}
6301#endif
6302
6303void zone_pcp_reset(struct zone *zone)
6304{
6305 unsigned long flags;
6306 int cpu;
6307 struct per_cpu_pageset *pset;
6308
6309
6310 local_irq_save(flags);
6311 if (zone->pageset != &boot_pageset) {
6312 for_each_online_cpu(cpu) {
6313 pset = per_cpu_ptr(zone->pageset, cpu);
6314 drain_zonestat(zone, pset);
6315 }
6316 free_percpu(zone->pageset);
6317 zone->pageset = &boot_pageset;
6318 }
6319 local_irq_restore(flags);
6320}
6321
6322#ifdef CONFIG_MEMORY_HOTREMOVE
6323
6324
6325
6326void
6327__offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
6328{
6329 struct page *page;
6330 struct zone *zone;
6331 int order, i;
6332 unsigned long pfn;
6333 unsigned long flags;
6334
6335 for (pfn = start_pfn; pfn < end_pfn; pfn++)
6336 if (pfn_valid(pfn))
6337 break;
6338 if (pfn == end_pfn)
6339 return;
6340 zone = page_zone(pfn_to_page(pfn));
6341 spin_lock_irqsave(&zone->lock, flags);
6342 pfn = start_pfn;
6343 while (pfn < end_pfn) {
6344 if (!pfn_valid(pfn)) {
6345 pfn++;
6346 continue;
6347 }
6348 page = pfn_to_page(pfn);
6349
6350
6351
6352
6353 if (unlikely(!PageBuddy(page) && PageHWPoison(page))) {
6354 pfn++;
6355 SetPageReserved(page);
6356 continue;
6357 }
6358
6359 BUG_ON(page_count(page));
6360 BUG_ON(!PageBuddy(page));
6361 order = page_order(page);
6362#ifdef CONFIG_DEBUG_VM
6363 printk(KERN_INFO "remove from free list %lx %d %lx\n",
6364 pfn, 1 << order, end_pfn);
6365#endif
6366 list_del(&page->lru);
6367 rmv_page_order(page);
6368 zone->free_area[order].nr_free--;
6369 for (i = 0; i < (1 << order); i++)
6370 SetPageReserved((page+i));
6371 pfn += (1 << order);
6372 }
6373 spin_unlock_irqrestore(&zone->lock, flags);
6374}
6375#endif
6376
6377#ifdef CONFIG_MEMORY_FAILURE
6378bool is_free_buddy_page(struct page *page)
6379{
6380 struct zone *zone = page_zone(page);
6381 unsigned long pfn = page_to_pfn(page);
6382 unsigned long flags;
6383 int order;
6384
6385 spin_lock_irqsave(&zone->lock, flags);
6386 for (order = 0; order < MAX_ORDER; order++) {
6387 struct page *page_head = page - (pfn & ((1 << order) - 1));
6388
6389 if (PageBuddy(page_head) && page_order(page_head) >= order)
6390 break;
6391 }
6392 spin_unlock_irqrestore(&zone->lock, flags);
6393
6394 return order < MAX_ORDER;
6395}
6396#endif
6397
6398static const struct trace_print_flags pageflag_names[] = {
6399 {1UL << PG_locked, "locked" },
6400 {1UL << PG_error, "error" },
6401 {1UL << PG_referenced, "referenced" },
6402 {1UL << PG_uptodate, "uptodate" },
6403 {1UL << PG_dirty, "dirty" },
6404 {1UL << PG_lru, "lru" },
6405 {1UL << PG_active, "active" },
6406 {1UL << PG_slab, "slab" },
6407 {1UL << PG_owner_priv_1, "owner_priv_1" },
6408 {1UL << PG_arch_1, "arch_1" },
6409 {1UL << PG_reserved, "reserved" },
6410 {1UL << PG_private, "private" },
6411 {1UL << PG_private_2, "private_2" },
6412 {1UL << PG_writeback, "writeback" },
6413#ifdef CONFIG_PAGEFLAGS_EXTENDED
6414 {1UL << PG_head, "head" },
6415 {1UL << PG_tail, "tail" },
6416#else
6417 {1UL << PG_compound, "compound" },
6418#endif
6419 {1UL << PG_swapcache, "swapcache" },
6420 {1UL << PG_mappedtodisk, "mappedtodisk" },
6421 {1UL << PG_reclaim, "reclaim" },
6422 {1UL << PG_swapbacked, "swapbacked" },
6423 {1UL << PG_unevictable, "unevictable" },
6424#ifdef CONFIG_MMU
6425 {1UL << PG_mlocked, "mlocked" },
6426#endif
6427#ifdef CONFIG_ARCH_USES_PG_UNCACHED
6428 {1UL << PG_uncached, "uncached" },
6429#endif
6430#ifdef CONFIG_MEMORY_FAILURE
6431 {1UL << PG_hwpoison, "hwpoison" },
6432#endif
6433#ifdef CONFIG_TRANSPARENT_HUGEPAGE
6434 {1UL << PG_compound_lock, "compound_lock" },
6435#endif
6436};
6437
6438static void dump_page_flags(unsigned long flags)
6439{
6440 const char *delim = "";
6441 unsigned long mask;
6442 int i;
6443
6444 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
6445
6446 printk(KERN_ALERT "page flags: %#lx(", flags);
6447
6448
6449 flags &= (1UL << NR_PAGEFLAGS) - 1;
6450
6451 for (i = 0; i < ARRAY_SIZE(pageflag_names) && flags; i++) {
6452
6453 mask = pageflag_names[i].mask;
6454 if ((flags & mask) != mask)
6455 continue;
6456
6457 flags &= ~mask;
6458 printk("%s%s", delim, pageflag_names[i].name);
6459 delim = "|";
6460 }
6461
6462
6463 if (flags)
6464 printk("%s%#lx", delim, flags);
6465
6466 printk(")\n");
6467}
6468
6469void dump_page(struct page *page)
6470{
6471 printk(KERN_ALERT
6472 "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
6473 page, atomic_read(&page->_count), page_mapcount(page),
6474 page->mapping, page->index);
6475 dump_page_flags(page->flags);
6476 mem_cgroup_print_bad_page(page);
6477}
6478