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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2010-06-29 15:05:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-06-29 15:29:30 -0700
commit4d845ebf4cf9e985b1704b1f08b37f744b4ede13 (patch)
treed137f9220a1572c2e3b53ce38950314f5aeb82e4 /mm/memcontrol.c
parent3c26c9d9597f982973b9b3a32364230096ab0d78 (diff)
downloadvexpress-lsk-4d845ebf4cf9e985b1704b1f08b37f744b4ede13.tar.gz
memcg: fix wake up in oom wait queue
OOM-waitqueue should be waken up when oom_disable is canceled. This is a fix for 3c11ecf448eff8f1 ("memcg: oom kill disable and oom status"). How to test: Create a cgroup A... 1. set memory.limit and memory.memsw.limit to be small value 2. echo 1 > /cgroup/A/memory.oom_control, this disables oom-kill. 3. run a program which must cause OOM. A program executed in 3 will sleep by oom_waiqueue in memcg. Then, how to wake it up is problem. 1. echo 0 > /cgroup/A/memory.oom_control (enable OOM-killer) 2. echo big mem > /cgroup/A/memory.memsw.limit_in_bytes(allow more swap) etc.. Without the patch, a task in slept can not be waken up. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.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.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c6ece0a5759..20a8193a7af 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1370,7 +1370,7 @@ static void memcg_wakeup_oom(struct mem_cgroup *mem)
static void memcg_oom_recover(struct mem_cgroup *mem)
{
- if (mem->oom_kill_disable && atomic_read(&mem->oom_lock))
+ if (atomic_read(&mem->oom_lock))
memcg_wakeup_oom(mem);
}
@@ -3781,6 +3781,8 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
return -EINVAL;
}
mem->oom_kill_disable = val;
+ if (!val)
+ memcg_oom_recover(mem);
cgroup_unlock();
return 0;
}