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Diffstat (limited to 'Documentation/cgroups/memory.txt')
| -rw-r--r-- | Documentation/cgroups/memory.txt | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt index 6cab1f29da4c..eac22d3b2f7b 100644 --- a/Documentation/cgroups/memory.txt +++ b/Documentation/cgroups/memory.txt @@ -184,6 +184,9 @@ limits on the root cgroup. Note2: When panic_on_oom is set to "2", the whole system will panic. +When oom event notifier is registered, event will be delivered. +(See oom_control section) + 2. Locking The memory controller uses the following hierarchy @@ -488,7 +491,22 @@ threshold in any direction. It's applicable for root and non-root cgroup. -10. TODO +10. OOM Control + +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. + +To register a notifier, application need: + - create an eventfd using eventfd(2) + - open memory.oom_control file + - write string like "<event_fd> <memory.oom_control>" to cgroup.event_control + +Application will be notifier through eventfd when oom happens. +OOM notification doesn't work for root cgroup. + + +11. TODO 1. Add support for accounting huge pages (as a separate controller) 2. Make per-cgroup scanner reclaim not-shared pages first |