linux-kernel - Re: [PATCH rh6] mm: skip zombie in OOM-killer

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Message-Id: <20110306201947.6CCC.A69D9226@jp.fujitsu.com>
Date:	Sun,  6 Mar 2011 20:20:46 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com, Andrey Vagin <avagin@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH rh6] mm: skip zombie in OOM-killer

> On Sat, 5 Mar 2011, Andrey Vagin wrote:
> 
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 7dcca55..2fc554e 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -311,7 +311,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
> >  		 * blocked waiting for another task which itself is waiting
> >  		 * for memory. Is there a better alternative?
> >  		 */
> > -		if (test_tsk_thread_flag(p, TIF_MEMDIE))
> > +		if (test_tsk_thread_flag(p, TIF_MEMDIE) && p->mm)
> >  			return ERR_PTR(-1UL);
> >  
> >  		/*
> 
> I think it would be better to just do
> 
> 	if (!p->mm)
> 		continue;
> 
> after the check for oom_unkillable_task() because everything that follows 
> this really depends on p->mm being non-NULL to actually do anything 
> useful.

I'm glad you join to review MM patches. It is worth effort for making
solid kernel. But, please look at a current code at first.


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