From: David Rientjes <rientjes@google.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Oleg Nesterov <oleg@redhat.com>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Tejun Heo <tj@kernel.org>, Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH 1/2] oom: do not live lock on frozen tasks
Date: Tue, 27 Sep 2011 11:30:13 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1109271128110.17876@chino.kir.corp.google.com> (raw)
In-Reply-To: <20110927075245.GA25807@tiehlicka.suse.cz>
On Tue, 27 Sep 2011, Michal Hocko wrote:
> I guess you mean a situation when select_bad_process picks up a process
> which is not marked as frozen yet but we send SIGKILL right before
> schedule is called in refrigerator.
> In that case either schedule should catch it by signal_pending_state
> check or we will pick it up next OOM round when we pick up the same
> process (if nothing else is eligible). Or am I missing something?
>
That doesn't close the race, the oom killer will see the presence of an
eligible TIF_MEMDIE thread in select_bad_process() and simply return to
the page allocator. You'd need to thaw it there as well and hope that
nothing now or in the future will get into an endless thaw-freeze-thaw
loop in the exit path.
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next prev parent reply other threads:[~2011-09-27 18:30 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-23 8:31 [PATCH] oom: skip " Konstantin Khlebnikov
2011-08-23 9:15 ` KAMEZAWA Hiroyuki
2011-08-23 13:46 ` Michal Hocko
2011-08-23 20:18 ` David Rientjes
2011-08-24 10:19 ` Michal Hocko
2011-08-24 19:31 ` David Rientjes
2011-08-25 9:19 ` Michal Hocko
2011-08-25 15:18 ` Oleg Nesterov
2011-08-25 16:47 ` Michal Hocko
2011-08-25 21:14 ` David Rientjes
2011-08-26 7:09 ` Michal Hocko
2011-08-26 8:56 ` Michal Hocko
2011-08-26 9:21 ` David Rientjes
2011-08-26 9:53 ` Michal Hocko
2011-08-26 11:01 ` Michal Hocko
2011-08-26 18:13 ` David Rientjes
2011-09-26 8:28 ` [PATCH 1/2] oom: do not live lock on " Michal Hocko
2011-09-26 8:56 ` David Rientjes
2011-09-26 9:14 ` Michal Hocko
2011-09-26 9:25 ` KAMEZAWA Hiroyuki
2011-09-26 9:32 ` Michal Hocko
2011-09-26 15:51 ` Rafael J. Wysocki
2011-09-26 18:28 ` Michal Hocko
2011-09-27 1:03 ` David Rientjes
2011-09-27 7:52 ` Michal Hocko
2011-09-27 18:30 ` David Rientjes [this message]
2011-09-26 10:28 ` Rusty Russell
2011-09-26 11:05 ` Michal Hocko
2011-09-27 2:21 ` Rusty Russell
2011-09-27 7:03 ` [PATCH] lguest: move process freezing before pending signals check Michal Hocko
2011-09-26 8:35 ` [PATCH 2/2] oom: give bonus to frozen processes Michal Hocko
2011-09-26 9:02 ` David Rientjes
2011-09-26 9:31 ` KAMEZAWA Hiroyuki
2011-09-26 9:54 ` Michal Hocko
2011-08-26 21:03 ` [PATCH] oom: skip frozen tasks Rafael J. Wysocki
2011-08-26 10:03 ` Konstantin Khlebnikov
2011-08-26 10:48 ` Michal Hocko
2011-08-26 12:44 ` Konstantin Khlebnikov
2011-08-26 12:59 ` Michal Hocko
2011-08-26 7:35 ` Konstantin Khlebnikov
2011-08-26 9:09 ` David Rientjes
2011-08-26 9:59 ` Konstantin Khlebnikov
2011-08-26 18:09 ` David Rientjes
2011-08-25 21:03 ` Rafael J. Wysocki
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