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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2010-06-29 15:05:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-06-29 15:29:30 -0700 |
| commit | 4d845ebf4cf9e985b1704b1f08b37f744b4ede13 (patch) | |
| tree | d137f9220a1572c2e3b53ce38950314f5aeb82e4 /mm/memcontrol.c | |
| parent | 3c26c9d9597f982973b9b3a32364230096ab0d78 (diff) | |
| download | lwn-4d845ebf4cf9e985b1704b1f08b37f744b4ede13.tar.gz lwn-4d845ebf4cf9e985b1704b1f08b37f744b4ede13.zip | |
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.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index c6ece0a57595..20a8193a7af8 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; } |