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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2011-06-16 02:08:46 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-06-16 07:04:01 +0400
commitfbc29a25e484be073e7d762c9f7f1d4bf8aecc48 (patch)
tree276a9e1e0c3d8f653dd821c049ec4b6940a06c1d /mm
parent26fe616844491a41a1abc02e29f7a9d1ec2f8ddb (diff)
downloadlinux-fbc29a25e484be073e7d762c9f7f1d4bf8aecc48.tar.xz
memcg: avoid percpu cached charge draining at softlimit
Based on Michal Hocko's comment. We are not draining per cpu cached charges during soft limit reclaim because background reclaim doesn't care about charges. It tries to free some memory and charges will not give any. Cached charges might influence only selection of the biggest soft limit offender but as the call is done only after the selection has been already done it makes no change. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c39a177bb641..cf7d027a8844 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1670,7 +1670,13 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
victim = mem_cgroup_select_victim(root_mem);
if (victim == root_mem) {
loop++;
- if (loop >= 1)
+ /*
+ * We are not draining per cpu cached charges during
+ * soft limit reclaim because global reclaim doesn't
+ * care about charges. It tries to free some memory and
+ * charges will not give any.
+ */
+ if (!check_soft && loop >= 1)
drain_all_stock_async(root_mem);
if (loop >= 2) {
/*