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9cf7666ace
linux/mm
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Johannes Weiner 9cf7666ace mm: memcontrol: drop unnecessary lru locking from mem_cgroup_migrate() 
Migration accounting in the memory controller used to have to handle
both oldpage and newpage being on the LRU already; fuse's page cache
replacement used to pass a recycled newpage that had been uncharged but
not freed and removed from the LRU, and the memcg migration code used to
uncharge oldpage to "pass on" the existing charge to newpage.

Nowadays, pages are no longer uncharged when truncated from the page
cache, but rather only at free time, so if a LRU page is recycled in
page cache replacement it'll also still be charged.  And we bail out of
the charge transfer altogether in that case.  Tell commit_charge() that
we know newpage is not on the LRU, to avoid taking the zone->lru_lock
unnecessarily from the migration path.

But also, oldpage is no longer uncharged inside migration.  We only use
oldpage for its page->mem_cgroup and page size, so we don't care about
its LRU state anymore either.  Remove any mention from the kernel doc.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Hugh Dickins <hughd@google.com>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mateusz Guzik <mguzik@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-03-15 16:55:16 -07:00
..
kasan kasan: add functions to clear stack poison 2016-03-09 15:43:42 -08:00
backing-dev.c mm/backing-dev.c: fix error path in wb_init() 2016-02-11 18:35:48 -08:00
balloon_compaction.c virtio_balloon: fix race between migration and ballooning 2016-01-12 20:47:06 +02:00
bootmem.c x86/mm: Introduce max_possible_pfn 2015-12-06 12:46:31 +01:00
cleancache.c cleancache: constify cleancache_ops structure 2016-01-27 09:09:57 -05:00
cma_debug.c
cma.c mm/cma.c: suppress warning 2015-11-05 19:34:48 -08:00
cma.h
compaction.c mm/compaction: speed up pageblock_pfn_to_page() when zone is contiguous 2016-03-15 16:55:16 -07:00
debug.c mm, debug: move bad flags printing to bad_page() 2016-03-15 16:55:16 -07:00
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
failslab.c mm: fault-inject take over bootstrap kmem_cache check 2016-03-15 16:55:16 -07:00
filemap.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
frame_vector.c mm: fix docbook comment for get_vaddr_frames() 2015-11-05 19:34:48 -08:00
frontswap.c
gup.c mm: retire GUP WARN_ON_ONCE that outlived its usefulness 2016-02-03 08:57:14 -08:00
highmem.c
huge_memory.c thp: cleanup split_huge_page() 2016-03-15 16:55:16 -07:00
hugetlb_cgroup.c mm: make compound_head() robust 2015-11-06 17:50:42 -08:00
hugetlb.c mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers 2016-03-09 15:43:42 -08:00
hwpoison-inject.c
init-mm.c
internal.h mm/compaction: speed up pageblock_pfn_to_page() when zone is contiguous 2016-03-15 16:55:16 -07:00
interval_tree.c
Kconfig mm/Kconfig: correct description of DEFERRED_STRUCT_PAGE_INIT 2016-02-05 18:10:40 -08:00
Kconfig.debug mm/page_poisoning.c: allow for zero poisoning 2016-03-15 16:55:16 -07:00
kmemcheck.c mm: kmemcheck skip object if slab allocation failed 2016-03-15 16:55:16 -07:00
kmemleak-test.c
kmemleak.c Revert "gfp: add __GFP_NOACCOUNT" 2016-01-14 16:00:49 -08:00
ksm.c mm/ksm.c: mark stable page dirty 2016-01-15 17:56:32 -08:00
list_lru.c mm: memcontrol: move kmem accounting code to CONFIG_MEMCG 2016-01-20 17:09:18 -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/madvise: update comment on sys_madvise() 2016-03-15 16:55:16 -07:00
Makefile mm/page_poison.c: enable PAGE_POISONING as a separate option 2016-03-15 16:55:16 -07:00
memblock.c mm/memblock.c: remove unnecessary memblock_type variable 2016-03-15 16:55:16 -07:00
memcontrol.c mm: memcontrol: drop unnecessary lru locking from mem_cgroup_migrate() 2016-03-15 16:55:16 -07:00
memory_hotplug.c mm/compaction: speed up pageblock_pfn_to_page() when zone is contiguous 2016-03-15 16:55:16 -07:00
memory-failure.c mm/memory-failure.c: remove useless "undef"s 2016-03-15 16:55:16 -07:00
memory.c mm: use linear_page_index() in do_fault() 2016-03-15 16:55:16 -07:00
mempolicy.c mm/mempolicy.c: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind 2016-03-15 16:55:16 -07:00
mempool.c mm/mempool: avoid KASAN marking mempool poison checks as use-after-free 2016-03-11 16:17:47 -08:00
memtest.c
migrate.c mm: migrate: consolidate mem_cgroup_migrate() calls 2016-03-15 16:55:16 -07:00
mincore.c thp: change pmd_trans_huge_lock() interface to return ptl 2016-01-21 17:20:51 -08:00
mlock.c mm: fix mlock accouting 2016-01-21 17:20:51 -08:00
mm_init.c
mmap.c mm: fix regression in remap_file_pages() emulation 2016-02-18 16:23:24 -08:00
mmu_context.c
mmu_notifier.c
mmzone.c mm/mmzone.c: memmap_valid_within() can be boolean 2016-01-14 16:00:49 -08:00
mprotect.c mm, dax: check for pmd_none() after split_huge_pmd() 2016-02-11 18:35:48 -08:00
mremap.c mm, dax: check for pmd_none() after split_huge_pmd() 2016-02-11 18:35:48 -08:00
msync.c mm/msync: use offset_in_page macro 2015-11-05 19:34:48 -08:00
nobootmem.c x86/mm: Introduce max_possible_pfn 2015-12-06 12:46:31 +01:00
nommu.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
oom_kill.c mm, oom: print symbolic gfp_flags in oom warning 2016-03-15 16:55:16 -07:00
page_alloc.c mm/compaction: speed up pageblock_pfn_to_page() when zone is contiguous 2016-03-15 16:55:16 -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/page_poisoning.c: allow for zero poisoning 2016-03-15 16:55:16 -07:00
page_idle.c mm: add page_check_address_transhuge() helper 2016-01-15 17:56:32 -08:00
page_io.c
page_isolation.c mm/page_isolation: do some cleanup in "undo_isolate_page_range" 2016-01-15 17:56:32 -08:00
page_owner.c mm, page_owner: dump page owner info from dump_page() 2016-03-15 16:55:16 -07:00
page_poison.c mm/page_poisoning.c: allow for zero poisoning 2016-03-15 16:55:16 -07:00
page-writeback.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
pagewalk.c thp: rename split_huge_page_pmd() to split_huge_pmd() 2016-01-15 17:56:32 -08:00
percpu-km.c
percpu-vm.c
percpu.c tree wide: use kvfree() than conditional kfree()/vfree() 2016-01-22 17:02:18 -08:00
pgtable-generic.c mm,thp: fix spellos in describing __HAVE_ARCH_FLUSH_PMD_TLB_RANGE 2016-02-11 18:35:48 -08:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-01-20 17:09:18 -08:00
quicklist.c
readahead.c mm: move lru_to_page to mm_inline.h 2016-01-14 16:00:49 -08:00
rmap.c mm: simplify lock_page_memcg() 2016-03-15 16:55:16 -07:00
shmem.c mm: migrate: do not touch page->mem_cgroup of live pages 2016-03-15 16:55:16 -07:00
slab_common.c mm: new API kfree_bulk() for SLAB+SLUB allocators 2016-03-15 16:55:16 -07:00
slab.c mm, sl[au]b: print gfp_flags as strings in slab_out_of_memory() 2016-03-15 16:55:16 -07:00
slab.h slub: convert SLAB_DEBUG_FREE to SLAB_CONSISTENCY_CHECKS 2016-03-15 16:55:16 -07:00
slob.c mm: slab: free kmem_cache_node after destroy sysfs file 2016-02-18 16:23:24 -08:00
slub.c mm, sl[au]b: print gfp_flags as strings in slab_out_of_memory() 2016-03-15 16:55:16 -07:00
sparse-vmemmap.c x86, mm: introduce vmem_altmap to augment vmemmap_populate() 2016-01-15 17:56:32 -08:00
sparse.c x86, mm: introduce vmem_altmap to augment vmemmap_populate() 2016-01-15 17:56:32 -08:00
swap_cgroup.c
swap_state.c mm: memcontrol: charge swap to cgroup2 2016-01-20 17:09:18 -08:00
swap.c mm, x86: get_user_pages() for dax mappings 2016-01-15 17:56:32 -08:00
swapfile.c wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
truncate.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
userfaultfd.c memcg: adjust to support new THP refcounting 2016-01-15 17:56:32 -08:00
util.c proc: revert /proc/<pid>/maps [stack:TID] annotation 2016-02-03 08:28:43 -08:00
vmacache.c mm/vmacache: inline vmacache_valid_mm() 2015-11-05 19:34:48 -08:00
vmalloc.c mm/vmalloc.c: use macro IS_ALIGNED to judge the aligment 2016-01-15 17:56:32 -08:00
vmpressure.c mm/vmpressure.c: fix subtree pressure detection 2016-02-03 08:28:43 -08:00
vmscan.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
vmstat.c mm, page_owner: convert page_owner_inited to static key 2016-03-15 16:55:16 -07:00
workingset.c mm: simplify lock_page_memcg() 2016-03-15 16:55:16 -07:00
zbud.c mm/zbud.c: use list_last_entry() instead of list_tail_entry() 2016-01-15 11:40:52 -08:00
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 2016-01-20 17:09:18 -08:00
zswap.c mm/zswap: change incorrect strncmp use to strcmp 2015-12-18 14:25:40 -08:00