linux-kernel - Re: [PATCH 01/10] oom: don't try to kill oom

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Message-ID: <alpine.DEB.2.00.1006081210180.23776@chino.kir.corp.google.com>
Date:	Tue, 8 Jun 2010 12:10:28 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 01/10] oom: don't try to kill oom_unkillable child

On Tue, 8 Jun 2010, KOSAKI Motohiro wrote:

> Now, badness() doesn't care neigher CPUSET nor mempolicy. Then
> if the victim child process is oom_unkillable()==1, __out_of_memory()
> can makes kernel hang eventually.
> 
> This patch fixes it.
> 
> 
> [remark: this is needed to fold "oom: sacrifice child with highest
> badness score for parent"]
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/oom_kill.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index d49d542..0d7397b 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -387,9 +387,6 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
>  static int __oom_kill_process(struct task_struct *p, struct mem_cgroup *mem,
>  			      int verbose)
>  {
> -	if (oom_unkillable(p, mem))
> -		return 1;
> -
>  	p = find_lock_task_mm(p);
>  	if (!p)
>  		return 1;
> @@ -440,6 +437,8 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
>  
>  			if (c->mm == p->mm)
>  				continue;
> +			if (oom_unkillable(c, mem, nodemask))
> +				continue;
>  
>  			/* badness() returns 0 if the thread is unkillable */
>  			cpoints = badness(c, uptime.tv_sec);

This doesn't apply to anything.
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