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

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Date:	Fri, 17 Oct 2014 17:24:29 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	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 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().

Oleg.

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