linux-kernel - Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0, oom

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Date:	Wed, 4 Nov 2009 07:28:26 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Justin Mattock <justinmattock@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	gcc@....gnu.org, David Rientjes <rientjes@...washington.edu>
Subject: Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0,
 oom_adj=0

On Wed,  4 Nov 2009 18:32:16 +0900 (JST) KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > It would help if the oom-killer were to print some information about
> > the oom-killed process's memory footprint.
> > 
> 
> 
> How about this?

looks good, thanks.

> ========
> Subject: [PATCH] oom: show vsz and rss information of the killed process
> 
> In typical oom anylysis scenario, we frequently want to know the killed
> process has memory leak or not at first step.
> This patch add vsz and rss information to oom log for helping its
> analysis. It save much times of debugging guys.
> 
> example:
> ===================================================================
> rsyslogd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
> Pid: 1308, comm: rsyslogd Not tainted 2.6.32-rc6 #24
> Call Trace:
> [<ffffffff8132e35b>] ?_spin_unlock+0x2b/0x40
> [<ffffffff810f186e>] oom_kill_process+0xbe/0x2b0
> 
> (snip)
> 
> 492283 pages non-shared
> Out of memory: kill process 2341 (memhog) score 527276 or a child
> Killed process 2341 (memhog) vsz:1054552kB, anon-rss:970588kB, file-rss:4kB
> ===========================================================================
>                              ^
>                              |
>                             here
> ...
>
> +	if (verbose) {
> +		task_lock(p);

We need to be careful with which locks we take on the oom-killer path,
because it can be called by code which already holds locks.  But I
expect task_lock() will be OK.

> +		printk(KERN_ERR "Killed process %d (%s) "
> +		       "vsz:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
> +		       task_pid_nr(p), p->comm,
> +		       K(p->mm->total_vm),
> +		       K(get_mm_counter(p->mm, anon_rss)),
> +		       K(get_mm_counter(p->mm, file_rss)));
> +		task_unlock(p);
> +	}

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