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From: KAMEZAWA Hiroyuki on 11 Mar 2010 03:00
Updated against mmotm-Mar9.
This patch set's feature is
- add filter to memcg's oom waitq.
- oom kill notifier for memcg.
- oom kill disable for memcg.
Major changes since previous one are
- add filter to wakeup queue.
- use its own function and logic rather than reusing thresholds.
- some minor fixes.
If oom-killer disabled, all tasks under memcg will sleep in memcg_oom_waitq.
What users can do when memcg-oom-killer is disabled is:
- enlarge limit.
- kill some task. ---(*)
- move some task to other cgroup. (with account migration)
(This patchset doesn't handle a case when account migraion isn't set.)
The benefit of (*) is that the user can save information of all tasks before
killing and he can take coredump (by gcore.) of troublesome process.
I'm now wondering when I remove RFC...but I think this will not have
much HUNK with dirty_ratio sets.
If some codes are unclear, feel free to request me.
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