Johannes Weiner 9a2385eef9 mm: memcontrol: remove ordering between pc->mem_cgroup and PageCgroupUsed ...

There is a write barrier between setting pc->mem_cgroup and
PageCgroupUsed, which was added to allow LRU operations to lookup the
memcg LRU list of a page without acquiring the page_cgroup lock.

But ever since commit 38c5d72f3ebe ("memcg: simplify LRU handling by new
rule"), pages are ensured to be off-LRU while charging, so nobody else
is changing LRU state while pc->mem_cgroup is being written, and there
are no read barriers anymore.

Remove the unnecessary write barrier.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@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>

2014-08-06 18:01:17 -07:00

..

backing-dev.c

arch: Mass conversion of smp_mb__*()

2014-04-18 14:20:48 +02:00

balloon_compaction.c

mm: print more details for bad_page()

2014-01-23 16:36:50 -08:00

bootmem.c

mm/bootmem.c: remove unused local `map'

2013-11-13 12:09:09 +09:00

cleancache.c

mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

2014-01-23 16:36:50 -08:00

cma.c

mm, CMA: clean-up log message

2014-08-06 18:01:16 -07:00

compaction.c

mm, compaction: properly signal and act upon lock and need_sched() contention

2014-06-04 16:54:11 -07:00

debug-pagealloc.c

…

dmapool.c

mm/dmapool.c: reuse devres_release() to free resources

2014-06-04 16:54:08 -07:00

early_ioremap.c

mm: create generic early_ioremap() support

2014-04-07 16:36:15 -07:00

fadvise.c

teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long

2013-03-03 22:46:22 -05:00

failslab.c

…

filemap_xip.c

seqcount: Add lockdep functionality to seqcount/seqlock structures

2013-11-06 12:40:26 +01:00

filemap.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-08-04 16:23:30 -07:00

fremap.c

mm: mark remap_file_pages() syscall as deprecated

2014-06-06 16:08:17 -07:00

frontswap.c

swap: change swap_list_head to plist, add swap_avail_head

2014-06-04 16:54:07 -07:00

gup.c

mm: cleanup __get_user_pages()

2014-06-04 16:54:05 -07:00

highmem.c

Some nice cleanups, and even a patch my wife did as a "live" demo for

2012-12-20 08:37:05 -08:00

huge_memory.c

mm: huge_memory: use GFP_TRANSHUGE when charging huge pages

2014-08-06 18:01:17 -07:00

hugetlb_cgroup.c

cgroup: replace cgroup_add_cftypes() with cgroup_add_legacy_cftypes()

2014-07-15 11:05:09 -04:00

hugetlb.c

kexec: export free_huge_page to VMCOREINFO

2014-07-30 17:16:13 -07:00

hwpoison-inject.c

mm/hwpoison: add '#' to hwpoison_inject

2014-01-21 16:19:48 -08:00

init-mm.c

…

internal.h

mm/internal.h: use nth_page

2014-08-06 18:01:16 -07:00

interval_tree.c

mm: add CONFIG_DEBUG_VM_RB build option

2012-10-09 16:22:42 +09:00

iov_iter.c

bio_vec-backed iov_iter

2014-05-06 17:39:45 -04:00

Kconfig

CMA: generalize CMA reserved area management functionality

2014-08-06 18:01:16 -07:00

Kconfig.debug

…

kmemcheck.c

…

kmemleak-test.c

mm/kmemleak-test.c: use pr_fmt for logging

2014-06-06 16:08:18 -07:00

kmemleak.c

mm: introduce kmemleak_update_trace()

2014-06-06 16:08:17 -07:00

ksm.c

sched: Remove proliferation of wait_on_bit() action functions

2014-07-16 15:10:39 +02:00

list_lru.c

mm: keep page cache radix tree nodes in check

2014-04-03 16:21:01 -07:00

maccess.c

…

madvise.c

mm: madvise: fix MADV_WILLNEED on shmem swapouts

2014-05-23 09:37:29 -07:00

Makefile

CMA: generalize CMA reserved area management functionality

2014-08-06 18:01:16 -07:00

memblock.c

mm/memblock.c: call kmemleak directly from memblock_(alloc|free)

2014-06-06 16:08:17 -07:00

memcontrol.c

mm: memcontrol: remove ordering between pc->mem_cgroup and PageCgroupUsed

2014-08-06 18:01:17 -07:00

memory_hotplug.c

mem-hotplug: introduce MMOP_OFFLINE to replace the hard coding -1

2014-08-06 18:01:16 -07:00

memory-failure.c

hwpoison: call action_result() in failure path of hwpoison_user_mappings()

2014-07-30 17:16:13 -07:00

memory.c

mm/memory.c: use entry = ACCESS_ONCE(*pte) in handle_pte_fault()

2014-08-06 18:01:15 -07:00

mempolicy.c

Merge branch 'for-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-07-10 11:38:23 -07:00

mempool.c

mm/mempool.c: update the kmemleak stack trace for mempool allocations

2014-06-06 16:08:17 -07:00

migrate.c

mm: fix direct reclaim writeback regression

2014-07-26 14:38:50 -07:00

mincore.c

mm + fs: prepare for non-page entries in page cache radix trees

2014-04-03 16:21:00 -07:00

mlock.c

mm: try_to_unmap_cluster() should lock_page() before mlocking

2014-04-07 16:35:57 -07:00

mm_init.c

mm: bring back /sys/kernel/mm

2014-01-27 21:02:39 -08:00

mmap.c

mm: convert some level-less printks to pr_*

2014-06-06 16:08:18 -07:00

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

mm: audit/fix non-modular users of module_init in core code

2014-01-23 16:36:52 -08:00

mmzone.c

mm: numa: Change page last {nid,pid} into {cpu,pid}

2013-10-09 14:47:45 +02:00

mprotect.c

mm: move mmu notifier call from change_protection to change_pmd_range

2014-04-07 16:35:50 -07:00

mremap.c

mm, thp: close race between mremap() and split_huge_page()

2014-05-11 17:55:48 +09:00

msync.c

msync: fix incorrect fstart calculation

2014-07-03 09:21:53 -07:00

nobootmem.c

mm/memblock.c: call kmemleak directly from memblock_(alloc|free)

2014-06-06 16:08:17 -07:00

nommu.c

mm: nommu: per-thread vma cache fix

2014-06-23 16:47:43 -07:00

oom_kill.c

mm, oom: base root bonus on current usage

2014-01-30 16:56:56 -08:00

page_alloc.c

mm: page_alloc: simplify drain_zone_pages by using min()

2014-08-06 18:01:16 -07:00

page_cgroup.c

mm/page_cgroup.c: mark functions as static

2014-04-03 16:21:02 -07:00

page_io.c

fix __swap_writepage() compile failure on old gcc versions

2014-06-14 19:30:48 -05:00

page_isolation.c

mm: memory-hotplug: enable memory hotplug to handle hugepage

2013-09-11 15:57:48 -07:00

page-writeback.c

mm/page-writeback.c: fix divide by zero in bdi_dirty_limits()

2014-07-30 17:16:13 -07:00

pagewalk.c

mm/pagewalk.c: fix walk_page_range() access of wrong PTEs

2013-10-30 14:27:03 -07:00

percpu-km.c

…

percpu-vm.c

…

percpu.c

percpu: Use ALIGN macro instead of hand coding alignment calculation

2014-06-19 11:00:27 -04:00

pgtable-generic.c

mm: fix TLB flush race between migration, and change_protection_range

2013-12-18 19:04:51 -08:00

process_vm_access.c

start adding the tag to iov_iter

2014-05-06 17:32:49 -04:00

quicklist.c

…

readahead.c

mm/readahead.c: remove unused file_ra_state from count_history_pages

2014-08-06 18:01:15 -07:00

rmap.c

mm/rmap.c: fix pgoff calculation to handle hugepage correctly

2014-07-23 15:10:54 -07:00

shmem.c

shmem: fix splicing from a hole while it's punched

2014-07-23 15:10:55 -07:00

slab_common.c

mm: move slab related stuff from util.c to slab_common.c

2014-08-06 18:01:15 -07:00

slab.c

mm/slab.c: fix comments

2014-08-06 18:01:15 -07:00

slab.h

slab: convert last use of __FUNCTION__ to __func__

2014-08-06 18:01:15 -07:00

slob.c

slab: get_online_mems for kmem_cache_{create,destroy,shrink}

2014-06-04 16:53:59 -07:00

slub.c

slab: fix the alias count (via sysfs) of slab cache

2014-08-06 18:01:15 -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_state.c

mm: page_alloc: convert hot/cold parameter and immediate callers to bool

2014-06-04 16:54:09 -07:00

swap.c

mm: non-atomically mark page accessed during page cache allocation where possible

2014-06-04 16:54:10 -07:00

swapfile.c

mm/swapfile.c: delete the "last_in_cluster < scan_base" loop in the body of scan_swap_map()

2014-06-04 16:54:12 -07:00

truncate.c

mm/fs: fix pessimization in hole-punching pagecache

2014-07-23 15:10:55 -07:00

util.c

mm: move slab related stuff from util.c to slab_common.c

2014-08-06 18:01:15 -07:00

vmacache.c

mm,vmacache: optimize overflow system-wide flushing

2014-06-04 16:53:57 -07:00

vmalloc.c

vmalloc: use rcu list iterator to reduce vmap_area_lock contention

2014-08-06 18:01:15 -07:00

vmpressure.c

arm, pm, vmpressure: add missing slab.h includes

2014-02-03 13:24:01 -05:00

vmscan.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

vmstat.c

mm: use the light version __mod_zone_page_state in mlocked_vma_newpage()

2014-06-04 16:54:07 -07:00

workingset.c

mm: keep page cache radix tree nodes in check

2014-04-03 16:21:01 -07:00

zbud.c

mm/zbud.c: make size unsigned like unique callsite

2014-06-04 16:54:13 -07:00

zsmalloc.c

zsmalloc: fixup trivial zs size classes value in comments

2014-06-04 16:54:13 -07:00

zswap.c

mm/zswap: NUMA aware allocation for zswap_dstmem

2014-06-04 16:54:14 -07:00