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WSL2-Linux-Kernel/mm
История
Minchan Kim 791b48b642 mm: vmscan: scan until it finds eligible pages 
Although there are a ton of free swap and anonymous LRU page in elgible
zones, OOM happened.

  balloon invoked oom-killer: gfp_mask=0x17080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOTRACK), nodemask=(null),  order=0, oom_score_adj=0
  CPU: 7 PID: 1138 Comm: balloon Not tainted 4.11.0-rc6-mm1-zram-00289-ge228d67e9677-dirty #17
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  Call Trace:
   oom_kill_process+0x21d/0x3f0
   out_of_memory+0xd8/0x390
   __alloc_pages_slowpath+0xbc1/0xc50
   __alloc_pages_nodemask+0x1a5/0x1c0
   pte_alloc_one+0x20/0x50
   __pte_alloc+0x1e/0x110
   __handle_mm_fault+0x919/0x960
   handle_mm_fault+0x77/0x120
   __do_page_fault+0x27a/0x550
   trace_do_page_fault+0x43/0x150
   do_async_page_fault+0x2c/0x90
   async_page_fault+0x28/0x30
  Mem-Info:
  active_anon:424716 inactive_anon:65314 isolated_anon:0
   active_file:52 inactive_file:46 isolated_file:0
   unevictable:0 dirty:27 writeback:0 unstable:0
   slab_reclaimable:3967 slab_unreclaimable:4125
   mapped:133 shmem:43 pagetables:1674 bounce:0
   free:4637 free_pcp:225 free_cma:0
  Node 0 active_anon:1698864kB inactive_anon:261256kB active_file:208kB inactive_file:184kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:532kB dirty:108kB writeback:0kB shmem:172kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
  DMA free:7316kB min:32kB low:44kB high:56kB active_anon:8064kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB slab_reclaimable:464kB slab_unreclaimable:40kB kernel_stack:0kB pagetables:24kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
  lowmem_reserve[]: 0 992 992 1952
  DMA32 free:9088kB min:2048kB low:3064kB high:4080kB active_anon:952176kB inactive_anon:0kB active_file:36kB inactive_file:0kB unevictable:0kB writepending:88kB present:1032192kB managed:1019388kB mlocked:0kB slab_reclaimable:13532kB slab_unreclaimable:16460kB kernel_stack:3552kB pagetables:6672kB bounce:0kB free_pcp:56kB local_pcp:24kB free_cma:0kB
  lowmem_reserve[]: 0 0 0 959
  Movable free:3644kB min:1980kB low:2960kB high:3940kB active_anon:738560kB inactive_anon:261340kB active_file:188kB inactive_file:640kB unevictable:0kB writepending:20kB present:1048444kB managed:1010816kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:832kB local_pcp:60kB free_cma:0kB
  lowmem_reserve[]: 0 0 0 0
  DMA: 1*4kB (E) 0*8kB 18*16kB (E) 10*32kB (E) 10*64kB (E) 9*128kB (ME) 8*256kB (E) 2*512kB (E) 2*1024kB (E) 0*2048kB 0*4096kB = 7524kB
  DMA32: 417*4kB (UMEH) 181*8kB (UMEH) 68*16kB (UMEH) 48*32kB (UMEH) 14*64kB (MH) 3*128kB (M) 1*256kB (H) 1*512kB (M) 2*1024kB (M) 0*2048kB 0*4096kB = 9836kB
  Movable: 1*4kB (M) 1*8kB (M) 1*16kB (M) 1*32kB (M) 0*64kB 1*128kB (M) 2*256kB (M) 4*512kB (M) 1*1024kB (M) 0*2048kB 0*4096kB = 3772kB
  378 total pagecache pages
  17 pages in swap cache
  Swap cache stats: add 17325, delete 17302, find 0/27
  Free swap  = 978940kB
  Total swap = 1048572kB
  524157 pages RAM
  0 pages HighMem/MovableOnly
  12629 pages reserved
  0 pages cma reserved
  0 pages hwpoisoned
  [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
  [  433]     0   433     4904        5      14       3       82             0 upstart-udev-br
  [  438]     0   438    12371        5      27       3      191         -1000 systemd-udevd

With investigation, skipping page of isolate_lru_pages makes reclaim
void because it returns zero nr_taken easily so LRU shrinking is
effectively nothing and just increases priority aggressively.  Finally,
OOM happens.

The problem is that get_scan_count determines nr_to_scan with eligible
zones so although priority drops to zero, it couldn't reclaim any pages
if the LRU contains mostly ineligible pages.

get_scan_count:

        size = lruvec_lru_size(lruvec, lru, sc->reclaim_idx);
	size = size >> sc->priority;

Assumes sc->priority is 0 and LRU list is as follows.

	N-N-N-N-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H

(Ie, small eligible pages are in the head of LRU but others are
 almost ineligible pages)

In that case, size becomes 4 so VM want to scan 4 pages but 4 pages from
tail of the LRU are not eligible pages.  If get_scan_count counts
skipped pages, it doesn't reclaim any pages remained after scanning 4
pages so it ends up OOM happening.

This patch makes isolate_lru_pages try to scan pages until it encounters
eligible zones's pages.

[akpm@linux-foundation.org: clean up mind-bending `for' statement.  Tweak comment text]
Fixes: 3db65812d6 ("Revert "mm, vmscan: account for skipped pages as a partial scan"")
Link: http://lkml.kernel.org/r/1494457232-27401-1-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2017-05-12 15:57:16 -07:00
..
kasan Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
Kconfig mm: remove AVR32 arch special handling in mm/Kconfig 2017-05-01 09:36:31 +02:00
Kconfig.debug mm: enable page poisoning early at boot 2017-05-03 15:52:10 -07:00
Makefile
…
backing-dev.c bdi: Drop 'parent' argument from bdi_register[_va]() 2017-04-20 12:09:55 -06:00
balloon_compaction.c
…
bootmem.c
…
cleancache.c
…
cma.c
…
cma.h
…
cma_debug.c
…
compaction.c mm, compaction: finish whole pageblock to reduce fragmentation 2017-05-08 17:15:10 -07:00
debug.c
…
debug_page_ref.c
…
dmapool.c
…
early_ioremap.c
…
fadvise.c
…
failslab.c
…
filemap.c Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-09 09:01:21 -07:00
frame_vector.c treewide: use kv[mz]alloc* rather than opencoded variants 2017-05-08 17:15:13 -07:00
frontswap.c
…
gup.c mm/gup.c: fix access_ok() argument type 2017-05-03 15:52:12 -07:00
highmem.c
…
huge_memory.c mm/huge_memory.c: deposit a pgtable for DAX PMD faults when required 2017-05-08 17:15:15 -07:00
hugetlb.c
…
hugetlb_cgroup.c
…
hwpoison-inject.c mm: hwpoison: call shake_page() unconditionally 2017-05-03 15:52:12 -07:00
init-mm.c
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internal.h mm, compaction: finish whole pageblock to reduce fragmentation 2017-05-08 17:15:10 -07:00
interval_tree.c
…
khugepaged.c mm, thp: copying user pages must schedule on collapse 2017-05-12 15:57:16 -07:00
kmemcheck.c mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU 2017-04-18 11:42:36 -07:00
kmemleak-test.c
…
kmemleak.c
…
ksm.c mm: make rmap_one boolean function 2017-05-03 15:52:10 -07:00
list_lru.c
…
maccess.c
…
madvise.c mm/madvise: move up the behavior parameter validation 2017-05-03 15:52:11 -07:00
memblock.c
…
memcontrol.c hwpoison, memcg: forcibly uncharge LRU pages 2017-05-12 15:57:15 -07:00
memory-failure.c hwpoison, memcg: forcibly uncharge LRU pages 2017-05-12 15:57:15 -07:00
memory.c
…
memory_hotplug.c mm, vmscan: prevent kswapd sleeping prematurely due to mismatched classzone_idx 2017-05-03 15:52:09 -07:00
mempolicy.c
…
mempool.c
…
memtest.c
…
migrate.c mm: make rmap_one boolean function 2017-05-03 15:52:10 -07:00
mincore.c
…
mlock.c mm: make try_to_munlock() return void 2017-05-03 15:52:10 -07:00
mm_init.c
…
mmap.c mm/mmap: replace SHM_HUGE_MASK with MAP_HUGE_MASK inside mmap_pgoff 2017-05-03 15:52:10 -07:00
mmu_context.c
…
mmu_notifier.c
…
mmzone.c
…
mprotect.c
…
mremap.c
…
msync.c
…
nobootmem.c
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nommu.c mm, vmalloc: use __GFP_HIGHMEM implicitly 2017-05-08 17:15:13 -07:00
oom_kill.c oom: improve oom disable handling 2017-05-03 15:52:10 -07:00
page-writeback.c Add GETFSMAP support; some performance improvements for very large 2017-05-08 11:30:05 -07:00
page_alloc.c mm: introduce memalloc_noreclaim_{save,restore} 2017-05-08 17:15:15 -07:00
page_counter.c
…
page_ext.c mm: enable page poisoning early at boot 2017-05-03 15:52:10 -07:00
page_idle.c mm: make rmap_one boolean function 2017-05-03 15:52:10 -07:00
page_io.c
…
page_isolation.c mm, page_alloc: count movable pages when stealing from pageblock 2017-05-08 17:15:10 -07:00
page_owner.c
…
page_poison.c mm: enable page poisoning early at boot 2017-05-03 15:52:10 -07:00
page_vma_mapped.c
…
pagewalk.c
…
percpu-km.c
…
percpu-vm.c
…
percpu.c
…
pgtable-generic.c
…
process_vm_access.c
…
quicklist.c
…
readahead.c
…
rmap.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
rodata_test.c mm: remove rodata_test_data export, add pr_fmt 2017-05-03 15:52:09 -07:00
shmem.c
…
slab.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
slab.h mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU 2017-04-18 11:42:36 -07:00
slab_common.c mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU 2017-04-18 11:42:36 -07:00
slob.c mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU 2017-04-18 11:42:36 -07:00
slub.c mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU 2017-04-18 11:42:36 -07:00
sparse-vmemmap.c
…
sparse.c mm/sparse: refine usemap_size() a little 2017-05-03 15:52:09 -07:00
swap.c mm: move MADV_FREE pages into LRU_INACTIVE_FILE list 2017-05-03 15:52:08 -07:00
swap_cgroup.c
…
swap_slots.c mm, swap: use kvzalloc to allocate some swap data structures 2017-05-08 17:15:13 -07:00
swap_state.c mm, swap: use kvzalloc to allocate some swap data structures 2017-05-08 17:15:13 -07:00
swapfile.c mm, swap: use kvzalloc to allocate some swap data structures 2017-05-08 17:15:13 -07:00
truncate.c mm: fix data corruption due to stale mmap reads 2017-05-12 15:57:15 -07:00
usercopy.c
…
userfaultfd.c
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util.c mm, vmalloc: fix vmalloc users tracking properly 2017-05-12 15:57:15 -07:00
vmacache.c
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vmalloc.c mm, vmalloc: fix vmalloc users tracking properly 2017-05-12 15:57:15 -07:00
vmpressure.c
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vmscan.c mm: vmscan: scan until it finds eligible pages 2017-05-12 15:57:16 -07:00
vmstat.c mm, vmstat: Remove spurious WARN() during zoneinfo print 2017-05-12 15:57:15 -07:00
workingset.c mm: memcontrol: use node page state naming scheme for memcg 2017-05-03 15:52:11 -07:00
z3fold.c
…
zbud.c
…
zpool.c
…
zsmalloc.c
…
zswap.c
…