linux-kernel - Re: Memory overcommit

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Message-ID: <alpine.DEB.2.00.0910281307370.23279@chino.kir.corp.google.com>
Date:	Wed, 28 Oct 2009 13:10:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vedran Furac <vedran.furac@...il.com>
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	minchan.kim@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: Memory overcommit

On Wed, 28 Oct 2009, Vedran Furac wrote:

> > Those are practically happening simultaneously with very little memory 
> > being available between each oom kill.  Only later is "test" killed:
> > 
> > [97240.203228] Out of memory: kill process 5005 (test) score 256912 or a child
> > [97240.206832] Killed process 5005 (test)
> > 
> > Notice how the badness score is less than 1/4th of the others.  So while 
> > you may find it to be hogging a lot of memory, there were others that 
> > consumed much more.
> ^^^^^^^^^^^^^^^^^^^^^
> 
> This is just wrong. I have 3.5GB of RAM, free says that 2GB are empty
> (ignoring cache). Culprit then allocates all free memory (2GB). That
> means it is using *more* than all other processes *together*. There
> cannot be any other "that consumed much more".
> 

Just post the oom killer results after using echo 1 > 
/proc/sys/vm/oom_dump_tasks as requested and it will clarify why those 
tasks were chosen to kill.  It will also show the result of using rss 
instead of total_vm and allow us to see how such a change would have 
changed the killing order for your workload.

> Thanks, I'll try that... but I guess that using rss would yield better
> results.
> 

We would know if you posted the data.
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