linux-kernel - Re: [PATCH] mmotm: mm-oom-fortify-task_will_free

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Message-ID: <20160630081909.GF18783@dhcp22.suse.cz>
Date:	Thu, 30 Jun 2016 10:19:09 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Vladimir Davydov <vdavydov@...allels.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmotm: mm-oom-fortify-task_will_free_mem-fix

On Wed 29-06-16 21:22:33, Oleg Nesterov wrote:
> On 06/29, Michal Hocko wrote:
> >
> > But it seems that further changes I am
> > planning in this area will benefit from stable task->mm in this path
> 
> Oh, so I hope you will cleanup this later,
> 
> > Just pull the task->mm !=
> > NULL check inside the function.
> 
> OK, but this means it will always return false if the task is a zombie
> leader.
> 
> I am not really arguing and this is not that bad, but this doesn't look
> nice and imo asks for cleanup.

I will keep that in mind and hopefully we can make this less obscure.
Who would like zombie leaders lurking around ;)
-- 
Michal Hocko
SUSE Labs