linux-kernel - Re: [PATCH] oom killer: break from infinite loop

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Message-ID: <alpine.DEB.2.00.1003271946090.9116@chino.kir.corp.google.com>
Date:	Sat, 27 Mar 2010 19:46:16 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Anfei Zhou <anfei.zhou@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	nishimura@....nes.nec.co.jp,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oom killer: break from infinite loop

On Thu, 25 Mar 2010, Anfei Zhou wrote:

> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 9b223af..aab9892 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -381,6 +381,8 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
>   */
>  static void __oom_kill_task(struct task_struct *p, int verbose)
>  {
> +	struct task_struct *t;
> +
>  	if (is_global_init(p)) {
>  		WARN_ON(1);
>  		printk(KERN_WARNING "tried to kill init!\n");
> @@ -412,6 +414,8 @@ static void __oom_kill_task(struct task_struct *p, int verbose)
>  	 */
>  	p->rt.time_slice = HZ;
>  	set_tsk_thread_flag(p, TIF_MEMDIE);
> +	for (t = next_thread(p); t != p; t = next_thread(t))
> +		set_tsk_thread_flag(t, TIF_MEMDIE);
>  
>  	force_sig(SIGKILL, p);
>  }

I like the concept, but I agree that it would probably be better to write 
it as Oleg suggested.  The oom killer has been rewritten in the -mm tree 
and so this patch doesn't apply cleanly, would it be possible to rebase to 
mmotm with the suggested coding sytle and post this again?

See http://userweb.kernel.org/~akpm/mmotm/mmotm-readme.txt	

Thanks!
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