Christoph Lameter 8cc0e37a56 vmstat: Remove BUG_ON from vmstat_update ... If we detect that there is nothing to do just set the flag and do not check if it was already set before. Races really do not matter. If the flag is set by any code then the shepherd will start dealing with the situation and reenable the vmstat workers when necessary again. Since commit 0eb77e988032 ("vmstat: make vmstat_updater deferrable again and shut down on idle") quiet_vmstat might update cpu_stat_off and mark a particular cpu to be handled by vmstat_shepherd. This might trigger a VM_BUG_ON in vmstat_update because the work item might have been sleeping during the idle period and see the cpu_stat_off updated after the wake up. The VM_BUG_ON is therefore misleading and no more appropriate. Moreover it doesn't really suite any protection from real bugs because vmstat_shepherd will simply reschedule the vmstat_work anytime it sees a particular cpu set or vmstat_update would do the same from the worker context directly. Even when the two would race the result wouldn't be incorrect as the counters update is fully idempotent. Change-Id: I4b46e471024ff4cac2b32234dffb3dfcf91713b6 Reported-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Christoph Lameter <cl@linux.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Git-commit: 587198ba5206cdf0d30855f7361af950a4172cd6 [shashim@codeaurora.org: resolve trivial merge conflicts] Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>		2016-03-23 21:22:15 -07:00
..
kasan	UBSAN: run-time undefined behavior sanity checker	2016-03-22 11:09:57 -07:00
backing-dev.c	mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress	2016-02-17 12:31:06 -08:00
balloon_compaction.c	mm: page migration trylock newpage at same level as oldpage	2015-11-05 19:34:48 -08:00
bootmem.c	mm: Remove __init annotations from free_bootmem_late	2016-03-22 11:03:23 -07:00
cleancache.c
cma.c	drivers: dma-contiguous: remove cma regions from kmemleak scan	2016-03-23 21:20:39 -07:00
cma.h	mm: cma: mark cma_bitmap_maxno() inline in header	2015-08-14 15:56:32 -07:00
cma_debug.c	mm/cma_debug: correct size input to bitmap function	2015-07-17 16:39:54 -07:00
compaction.c	mm: compaction: fix the page state calculation in too_many_isolated	2016-03-22 11:03:54 -07:00
debug-pagealloc.c	mm: Mark free pages as read only	2016-03-22 11:03:20 -07:00
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, fs: introduce mapping_gfp_constraint()	2015-11-06 17:50:42 -08:00
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: introduce VM_LOCKONFAULT	2015-11-05 19:34:48 -08:00
highmem.c
huge_memory.c	mm: loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390	2015-11-20 16:17:32 -08:00
hugetlb.c	mm/hugetlb.c: fix resv map memory leak for placeholder entries	2015-12-12 10:15:34 -08:00
hugetlb_cgroup.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
hwpoison-inject.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
init-mm.c
internal.h	mm: use 'unsigned int' for page order	2015-11-06 17:50:42 -08:00
interval_tree.c
Kconfig	mm: zcache: add core files	2016-03-23 21:15:13 -07:00
Kconfig.debug	defconfig: 8994: enable CONFIG_DEBUG_SLUB_PANIC_ON	2016-03-22 11:03:31 -07:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	kmemleak : Make kmemleak_stack_scan optional using config	2016-03-22 11:03:47 -07:00
ksm.c	KSM: Start KSM by default	2016-03-22 11:03:30 -07:00
list_lru.c	memcg: simplify and inline __mem_cgroup_from_kmem	2015-11-05 19:34:48 -08:00
maccess.c	mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe	2015-11-05 19:34:48 -08:00
madvise.c	mm: add a field to store names for private anonymous memory	2016-02-16 13:54:13 -08:00
Makefile	mm: swap: swap ratio support	2016-03-23 21:19:04 -07:00
memblock.c	mm/memblock: fix a race between search and remove	2016-03-23 21:19:51 -07:00
memcontrol.c	memcg: only free spare array when readers are done	2016-02-25 12:01:22 -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	mm: memory: reduce fault_around_bytes	2016-03-23 21:16:02 -07:00
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
mempolicy.c	mm: add a field to store names for private anonymous memory	2016-02-16 13:54:13 -08:00
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: cma: add trace events for CMA alloc perf testing	2016-03-23 21:14:00 -07:00
mincore.c	mm/mincore: use offset_in_page macro	2015-11-05 19:34:48 -08:00
mlock.c	Merge remote-tracking branch 'lsk-44/linux-linaro-lsk-v4.4' into 44rc2	2016-03-23 20:51:00 -07:00
mm_init.c	mm: meminit: remove mminit_verify_page_links	2015-06-30 19:44:56 -07:00
mmap.c	Merge remote-tracking branch 'lsk-44/linux-linaro-lsk-v4.4' into 44rc2	2016-03-23 20:51:00 -07:00
mmu_context.c
mmu_notifier.c	mmu-notifier: add clear_young callback	2015-09-10 13:29:01 -07:00
mmzone.c
mprotect.c	mm: add a field to store names for private anonymous memory	2016-02-16 13:54:13 -08:00
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: Remove __init annotations from free_bootmem_late	2016-03-22 11:03:23 -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: make dump_tasks public	2016-03-22 11:03:30 -07:00
page-writeback.c	mm: page-writeback: fix page state calculation in throttle_vm_writeout	2016-03-22 11:03:54 -07:00
page_alloc.c	mm: switch KASan hook calling order in page alloc/free path	2016-03-22 11:03:46 -07:00
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, page_isolation: make set/unset_migratetype_isolate() file-local	2015-09-08 15:35:28 -07:00
page_owner.c	mm/page_owner: set correct gfp_mask on page_owner	2015-07-17 16:39:54 -07:00
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c	mm/percpu: use offset_in_page macro	2015-11-05 19:34:48 -08:00
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: change initial readahead window size calculation	2016-03-22 11:03:39 -07:00
rmap.c	mm: page migration use migration entry for swapcache too	2015-11-05 19:34:48 -08:00
shmem.c	ashmem: Add shmem_set_file to mm/shmem.c	2016-01-11 09:48:49 +05:30
showmem.c	mm: showmem: make the notifiers atomic	2016-03-22 11:03:55 -07:00
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
slab_common.c	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	mm: slub: call kasan_alloc_pages before freeing pages in slub	2016-03-22 11:10:45 -07:00
sparse-vmemmap.c
sparse.c
swap.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
swap_cgroup.c
swap_ratio.c	mm: swap: swap ratio support	2016-03-23 21:19:04 -07:00
swap_state.c	mm: swap: fix swapcache usage for fast swap devices	2016-03-23 21:13:01 -07:00
swapfile.c	mm: swap: swap ratio support	2016-03-23 21:19:04 -07:00
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	mm/util: use offset_in_page macro	2015-11-05 19:34:48 -08:00
vmacache.c	mm/vmacache: inline vmacache_valid_mm()	2015-11-05 19:34:48 -08:00
vmalloc.c	mm: Update is_vmalloc_addr to account for vmalloc savings	2016-03-22 11:03:59 -07:00
vmpressure.c	mm: vmpressure: account allocstalls only on higher pressures	2016-03-22 11:03:53 -07:00
vmscan.c	mm: swap: don't delay swap free for fast swap devices	2016-03-22 11:03:52 -07:00
vmstat.c	vmstat: Remove BUG_ON from vmstat_update	2016-03-23 21:22:15 -07:00
workingset.c
zbud.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zcache.c	mm: zcache: fix use after free in zcache_store_page	2016-03-23 21:19:12 -07:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	zsmalloc: fix migrate_zspage-zs_free race condition	2016-02-17 12:31:06 -08:00
zswap.c	mm/zswap: change incorrect strncmp use to strcmp	2015-12-18 14:25:40 -08:00