On Wed, Oct 31, 2012 at 09:38:47PM -0700, David Rientjes wrote:

On Thu, 1 Nov 2012, Minchan Kim wrote:

quoted

If mutiple threads are page faulting and try to allocate memory, then they
should go to oom path and they will reach following code.

        if (task->flags & PF_EXITING) {
               if (task == current)
                        return OOM_SCAN_SELECT;

No, OOM_SCAN_SELECT does not return immediately and kill that process; it 
only prefers to kill that process first iff the oom killer isn't deferred 
because it finds TIF_MEMDIE threads or other PF_EXITING threads other than 
current.  So if multiple processes are in the exit path with PF_EXITING 
and require additional memory then the oom killed may defer without 
killing anything.  That's what I suspect is happening in this case.

Indeed.
Thanks for correcting me, David.

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Kind regards,
Minchan Kim

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