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authorMichal Hocko <mhocko@suse.cz>2013-09-12 22:13:30 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-12 22:38:01 (GMT)
commite839b6a1c8d0895803bcbd587595a54f4221a625 (patch)
tree0ec95c564cb6f4c0ca0858dd88a3364ee0e383e5 /mm/memcontrol.c
parent7d910c054be42515cd3e43f2e1bec8c536632de2 (diff)
downloadlinux-fsl-qoriq-e839b6a1c8d0895803bcbd587595a54f4221a625.tar.xz
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>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a18e228..848fc6c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1885,7 +1885,11 @@ enum mem_cgroup_filter_t
mem_cgroup_soft_reclaim_eligible(struct mem_cgroup *memcg,
struct mem_cgroup *root)
{
- struct mem_cgroup *parent = memcg;
+ struct mem_cgroup *parent;
+
+ if (!memcg)
+ memcg = root_mem_cgroup;
+ parent = memcg;
if (res_counter_soft_limit_excess(&memcg->res))
return VISIT;