linux-kernel - Re: + freezer-check-oom-kill-while-being-frozen.patch added to -mm tree

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Message-ID: <20141017160737.GH8076@dhcp22.suse.cz>
Date:	Fri, 17 Oct 2014 18:07:37 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: + freezer-check-oom-kill-while-being-frozen.patch added to -mm
 tree

On Fri 17-10-14 17:24:29, Oleg Nesterov wrote:
> On 10/16, Cong Wang wrote:
> >
> > On Thu, Oct 16, 2014 at 3:22 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> > > On 10/16, Cong Wang wrote:
> > >>
> > >> it will always stay in asleep after schedule()?
> > >
> > > Not always. But it will stay asleep in this particular case.
> >
> > Hmm, so we still need to wake it up in oom killer:
> >
> >         if (test_tsk_thread_flag(task, TIF_MEMDIE)) {
> >                if (unlikely(frozen(task)))
> >                       wake_up_state(task, TASK_UNINTERRUPTIBLE);
> >
> > I will update the patch if Michal doesn't.
> 
> I think it would be better to simply keep that __thaw_task() in
> oom_scan_process_thread().

yeah, v2 of the patch (I guess you were on CC) does exactly this.

Thanks!
-- 
Michal Hocko
SUSE Labs
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