]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
memcg, vmscan: do not attempt soft limit reclaim if it would not scan anything
authorMichal Hocko <mhocko@suse.cz>
Thu, 12 Sep 2013 22:13:30 +0000 (15:13 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 12 Sep 2013 22:38:01 +0000 (15:38 -0700)
commite839b6a1c8d0895803bcbd587595a54f4221a625
tree0ec95c564cb6f4c0ca0858dd88a3364ee0e383e5
parent7d910c054be42515cd3e43f2e1bec8c536632de2
memcg, vmscan: do not attempt soft limit reclaim if it would not scan anything

mem_cgroup_should_soft_reclaim controls whether soft reclaim pass is
done and it always says yes currently.  Memcg iterators are clever to
skip nodes that are not soft reclaimable quite efficiently but
mem_cgroup_should_soft_reclaim can be more clever and do not start the
soft reclaim pass at all if it knows that nothing would be scanned
anyway.

In order to do that, simply reuse mem_cgroup_soft_reclaim_eligible for
the target group of the reclaim and allow the pass only if the whole
subtree wouldn't be skipped.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memcontrol.c
mm/vmscan.c