Re: [patch -mmotm] oom: only oom kill exiting tasks with attached memory

[Rik van Riel <riel@redhat.com>]

David Rientjes wrote:
> When a task is chosen for oom kill and is found to be PF_EXITING,
> __oom_kill_task() is called to elevate the task's timeslice and give it
> access to memory reserves so that it may quickly exit.
> 
> This privilege is unnecessary, however, if the task has already detached
> its mm.  Although its possible for the mm to become detached later since
> task_lock() is not held, __oom_kill_task() will simply be a no-op in such
> circumstances.
> 
> Subsequently, it is no longer necessary to warn about killing mm-less
> tasks since it is a no-op.
> 
> Cc: Rik van Riel <riel@redhat.com>
> Signed-off-by: David Rientjes <rientjes@google.com>

Acked-by: Rik van Riel <riel@redhat.com>

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