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Shaohua Li 14d8e5cae0 mm/vmscan.c: set correct defer count for shrinker 
commit 5f33a0803bbd781de916f5c7448cbbbbc763d911 upstream.

Our system uses significantly more slab memory with memcg enabled with
the latest kernel.  With 3.10 kernel, slab uses 2G memory, while with
4.6 kernel, 6G memory is used.  The shrinker has problem.  Let's see we
have two memcg for one shrinker.  In do_shrink_slab:

1. Check cg1.  nr_deferred = 0, assume total_scan = 700.  batch size
   is 1024, then no memory is freed.  nr_deferred = 700

2. Check cg2.  nr_deferred = 700.  Assume freeable = 20, then
   total_scan = 10 or 40.  Let's assume it's 10.  No memory is freed.
   nr_deferred = 10.

The deferred share of cg1 is lost in this case.  kswapd will free no
memory even run above steps again and again.

The fix makes sure one memcg's deferred share isn't lost.

Link: http://lkml.kernel.org/r/2414be961b5d25892060315fbb56bb19d81d0c07.1476227351.git.shli@fb.com
Signed-off-by: Shaohua Li <shli@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-06 11:16:14 +01:00
..
kasan
kasan: update kasan_global for gcc 7
2016-12-08 07:15:24 +01:00
backing-dev.c
block: fix bdi vs gendisk lifetime mismatch
2016-08-20 18:09:24 +02:00
balloon_compaction.c
virtio_balloon: fix race between migration and ballooning
2016-03-03 15:07:18 -08:00
bootmem.c
bootmem: avoid freeing to bootmem after bootmem is done
2015-09-08 15:35:28 -07:00
cleancache.c
cleancache: remove limit on the number of cleancache enabled filesystems
2015-04-14 16:49:03 -07:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma: silence warnings due to max() usage
2016-11-10 16:36:36 +01:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm, compaction: prevent VM_BUG_ON when terminating freeing scanner
2016-08-10 11:49:25 +02:00
debug-pagealloc.c
mm/debug-pagealloc: make debug-pagealloc boottime configurable
2014-12-13 12:42:48 -08:00
debug.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
dmapool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
writeback: implement and use inode_congested()
2015-06-02 08:33:35 -06:00
failslab.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
filemap.c
mm: filemap: fix mapping->nrpages double accounting in fuse
2016-10-28 03:01:34 -04:00
frame_vector.c
mm: fix docbook comment for get_vaddr_frames()
2015-11-05 19:34:48 -08:00
frontswap.c
frontswap: allow multiple backends
2015-06-24 17:49:45 -07:00
gup.c
mm: remove gup_flags FOLL_WRITE games from __get_user_pages()
2016-10-20 10:00:47 +02:00
highmem.c
mm/highmem: make kmap cache coloring aware
2014-08-06 18:01:22 -07:00
huge_memory.c
mm/huge_memory: replace VM_NO_THP VM_BUG_ON with actual VMA check
2016-05-04 14:48:49 -07:00
hugetlb_cgroup.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
hugetlb.c
mm/hugetlb: fix memory offline with hugepage size > memory block size
2016-10-31 04:13:58 -06:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
mm: Add a user_ns owner to mm_struct and fix ptrace permission checks
2017-01-06 11:16:11 +01:00
internal.h
mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
2016-08-10 11:49:25 +02:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
Kconfig.debug
mm/debug_pagealloc: remove obsolete Kconfig options
2015-01-08 15:10:52 -08:00
kmemcheck.c
mm/slab_common: move kmem_cache definition to internal header
2014-10-09 22:25:50 -04:00
kmemleak-test.c
mm/kmemleak-test.c: use pr_fmt for logging
2014-06-06 16:08:18 -07:00
kmemleak.c
mm/kmemleak.c: remove unneeded initialization of object to NULL
2015-11-05 19:34:48 -08:00
ksm.c
mm,ksm: fix endless looping in allocating memory when ksm enable
2016-10-07 15:23:40 +02:00
list_lru.c
mm/list_lru.c: avoid error-path NULL pointer deref
2016-11-10 16:36:32 +01:00
maccess.c
mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe
2015-11-05 19:34:48 -08:00
madvise.c
mm: madvise allow remove operation for hugetlbfs
2015-09-08 15:35:28 -07:00
Makefile
media updates for v4.3-rc1
2015-09-11 16:42:39 -07:00
memblock.c
mm/memblock: make memblock_remove_range() static
2015-11-05 19:34:48 -08:00
memcontrol.c
mm: memcontrol: do not recurse in direct reclaim
2016-11-10 16:36:32 +01:00
memory_hotplug.c
mm/memory_hotplug.c: check for missing sections in test_pages_in_a_zone()
2015-12-29 17:45:49 -08:00
memory-failure.c
mm: soft-offline: check return value in second __get_any_page() call
2016-02-25 12:01:21 -08:00
memory.c
numa: fix /proc/<pid>/numa_maps for THP
2016-05-04 14:48:49 -07:00
mempolicy.c
mm: rename alloc_pages_exact_node() to __alloc_pages_node()
2015-09-08 15:35:28 -07:00
mempool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm: Export migrate_page_move_mapping and migrate_page_copy
2016-07-27 09:47:31 -07:00
mincore.c
mm/mincore: use offset_in_page macro
2015-11-05 19:34:48 -08:00
mlock.c
mm: fix mlock accouting
2016-02-25 12:01:21 -08:00
mm_init.c
mm: meminit: remove mminit_verify_page_links
2015-06-30 19:44:56 -07:00
mmap.c
mm: fix regression in remap_file_pages() emulation
2016-02-25 12:01:21 -08:00
mmu_context.c
sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm
2014-02-21 08:50:17 +01:00
mmu_notifier.c
mmu-notifier: add clear_young callback
2015-09-10 13:29:01 -07:00
mmzone.c
mm: microoptimize zonelist operations
2015-02-11 17:06:02 -08:00
mprotect.c
userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx
2015-09-04 16:54:41 -07:00
mremap.c
mm/mremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm: page_alloc: pass PFN to __free_pages_bootmem
2015-06-30 19:44:55 -07:00
nommu.c
mm/nommu.c: drop unlikely inside BUG_ON()
2015-11-05 19:34:48 -08:00
oom_kill.c
mm/oom_kill.c: avoid attempting to kill init sharing same memory
2015-12-12 10:15:34 -08:00
page_alloc.c
mm, meminit: ensure node is online before checking whether pages are uninitialised
2016-08-10 11:49:25 +02:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_idle.c
mm: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_io.c
fs: use helper bio_add_page() instead of open coding on bi_io_vec
2015-08-13 12:32:00 -06:00
page_isolation.c
mm: fix invalid node in alloc_migrate_target()
2016-04-20 15:41:53 +09:00
page_owner.c
mm/page_owner: set correct gfp_mask on page_owner
2015-07-17 16:39:54 -07:00
page-writeback.c
writeback: use higher precision calculation in domain_dirty_limits()
2016-07-27 09:47:29 -07:00
pagewalk.c
mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers
2015-03-25 16:20:30 -07:00
percpu-km.c
percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated
2014-09-02 14:46:05 -04:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
percpu: fix synchronization between synchronous map extension and chunk destruction
2016-07-27 09:47:33 -07:00
pgtable-generic.c
mm,thp: khugepaged: call pte flush at the time of collapse
2016-02-25 12:01:23 -08:00
process_vm_access.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 12:01:16 -08:00
quicklist.c
…
readahead.c
mm, fs: introduce mapping_gfp_constraint()
2015-11-06 17:50:42 -08:00
rmap.c
mm: page migration use migration entry for swapcache too
2015-11-05 19:34:48 -08:00
shmem.c
tmpfs: fix regression hang in fallocate undo
2016-07-27 09:47:40 -07:00
slab_common.c
mm: memcontrol: fix cgroup creation failure after many small jobs
2016-08-16 09:30:51 +02:00
slab.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slab.h
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slob.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slub.c
slub: clean up code for kmem cgroup support to kmem_cache_free_bulk
2016-05-04 14:48:49 -07:00
sparse-vmemmap.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
sparse.c
mm: use macros from compiler.h instead of __attribute__((...))
2014-04-07 16:35:54 -07:00
swap_cgroup.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
swap_state.c
mm: swap: zswap: maybe_preload & refactoring
2015-09-08 15:35:28 -07:00
swap.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
swapfile.c
swapfile: fix memory corruption via malformed swapfile
2016-11-18 10:48:34 +01:00
truncate.c
memcg: add per cgroup dirty page accounting
2015-06-02 08:33:33 -06:00
userfaultfd.c
userfaultfd: avoid mmap_sem read recursion in mcopy_atomic
2015-09-04 16:54:41 -07:00
util.c
proc: revert /proc/<pid>/maps [stack:TID] annotation
2016-09-15 08:27:46 +02:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()
2015-11-20 16:17:32 -08:00
vmpressure.c
mm/vmpressure.c: fix race in vmpressure_work_fn()
2014-12-02 17:32:07 -08:00
vmscan.c
mm/vmscan.c: set correct defer count for shrinker
2017-01-06 11:16:14 +01:00
vmstat.c
vmstat: allocate vmstat_wq before it is used
2016-01-08 23:47:54 -08:00
workingset.c
mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()
2016-10-28 03:01:34 -04:00
zbud.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
zsmalloc: fix zs_can_compact() integer overflow
2016-05-18 17:06:44 -07:00
zswap.c
mm/zswap: provide unique zpool name
2016-05-11 11:21:14 +02:00