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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 |