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author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2010-05-26 14:42:37 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:43 -0700 |
commit | 3c11ecf448eff8f12922c498b8274ce98587eb74 (patch) | |
tree | 0a28aeef7759ead93ff58fd7db2fe61797523f7e /Documentation/cgroups/memory.txt | |
parent | 9490ff275606da012d5b373342a49610ad61cb81 (diff) | |
download | linux-stable-3c11ecf448eff8f12922c498b8274ce98587eb74.tar.gz linux-stable-3c11ecf448eff8f12922c498b8274ce98587eb74.tar.bz2 linux-stable-3c11ecf448eff8f12922c498b8274ce98587eb74.zip |
memcg: oom kill disable and oom status
This adds a feature to disable oom-killer for memcg, if disabled, of
course, tasks under memcg will stop.
But now, we have oom-notifier for memcg. And the world around memcg is
not under out-of-memory. memcg's out-of-memory just shows memcg hits
limit. Then, administrator or management daemon can recover the situation
by
- kill some process
- enlarge limit, add more swap.
- migrate some tasks
- remove file cache on tmps (difficult ?)
Unlike oom-killer, you can take enough information before killing tasks.
(by gcore, or, ps etc.)
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/cgroups/memory.txt')
-rw-r--r-- | Documentation/cgroups/memory.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt index eac22d3b2f7b..44e7ded33448 100644 --- a/Documentation/cgroups/memory.txt +++ b/Documentation/cgroups/memory.txt @@ -493,6 +493,8 @@ It's applicable for root and non-root cgroup. 10. OOM Control +memory.oom_control file is for OOM notification and other controls. + Memory controler implements oom notifier using cgroup notification API (See cgroups.txt). It allows to register multiple oom notification delivery and gets notification when oom happens. @@ -505,6 +507,27 @@ To register a notifier, application need: Application will be notifier through eventfd when oom happens. OOM notification doesn't work for root cgroup. +You can disable oom-killer by writing "1" to memory.oom_control file. +As. + #echo 1 > memory.oom_control + +This operation is only allowed to the top cgroup of subhierarchy. +If oom-killer is disabled, tasks under cgroup will hang/sleep +in memcg's oom-waitq when they request accountable memory. + +For running them, you have to relax the memcg's oom sitaution by + * enlarge limit or reduce usage. +To reduce usage, + * kill some tasks. + * move some tasks to other group with account migration. + * remove some files (on tmpfs?) + +Then, stopped tasks will work again. + +At reading, current status of OOM is shown. + oom_kill_disable 0 or 1 (if 1, oom-killer is disabled) + under_oom 0 or 1 (if 1, the memcg is under OOM,tasks may + be stopped.) 11. TODO |