linux-kernel - Re: Memory overcommit

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Message-ID: <alpine.DEB.2.00.0910290136000.11476@chino.kir.corp.google.com>
Date:	Thu, 29 Oct 2009 01:38:24 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	vedran.furac@...il.com, Hugh Dickins <hugh.dickins@...cali.co.uk>,
	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, KAMEZAWA Hiroyuki wrote:

> It's _not_ special to X.
> 
> Almost all applications which uses many dynamica libraries can be affected by this,
> total_vm. And, as I explained to Vedran, multi-threaded program like Java can easily
> increase total_vm without using many anon_rss.
> And it's the reason I hate overcommit_memory. size of VM doesn't tell anything.
> 

Right, because in Vedran's latest oom log it shows that Xorg is preferred 
more than any other thread other than the memory hogging test program with 
your patch than without.  I pointed out a clear distinction in the killing 
order using both total_vm and rss in that log and in my opinion killing 
Xorg as opposed to krunner would be undesireable.
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