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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2012-01-13 05:19:01 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-13 08:13:07 +0400
commit38c5d72f3ebe5ddd57d2f08dc035070fc6c9a287 (patch)
tree6461c0dfec95dccc92191f059fbe99b5660a8860 /mm/sparse-vmemmap.c
parent4e5f01c2b9b94321992acb09c35d34f5ee5bb274 (diff)
downloadlinux-38c5d72f3ebe5ddd57d2f08dc035070fc6c9a287.tar.xz
memcg: simplify LRU handling by new rule
Now, at LRU handling, memory cgroup needs to do complicated works to see valid pc->mem_cgroup, which may be overwritten. This patch is for relaxing the protocol. This patch guarantees - when pc->mem_cgroup is overwritten, page must not be on LRU. By this, LRU routine can believe pc->mem_cgroup and don't need to check bits on pc->flags. This new rule may adds small overheads to swapin. But in most case, lru handling gets faster. After this patch, PCG_ACCT_LRU bit is obsolete and removed. [akpm@linux-foundation.org: remove unneeded VM_BUG_ON(), restore hannes's christmas tree] [akpm@linux-foundation.org: clean up code comment] [hughd@google.com: fix NULL mem_cgroup_try_charge] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Ying Han <yinghan@google.com> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse-vmemmap.c')
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