linux-kernel - Re: [RFC][PATCH] oom_kill: avoid depends on total_vm and use real RSS/swap value for oom

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Date:	Wed, 28 Oct 2009 09:32:26 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	vedran.furac@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rientjes@...gle.com
Subject: Re: [RFC][PATCH] oom_kill: avoid depends on total_vm and use real
 RSS/swap value for oom_score (Re: Memory overcommit

On Tue, 27 Oct 2009 19:47:43 +0100
Andrea Arcangeli <aarcange@...hat.com> wrote: 
> > should be included along with rss isn't quite clear to me: I'm not
> > saying you're wrong, not at all, just that it's not quite obvious.
> 
> Agreed it's not obvious. Intuitively I think only including RSS and no
> swap is best, but clearly I can't be entirely against including swap
> too as there may be scenarios where including swap provides for a
> better choice.
> 
> My argument for not including swap is that we kill tasks to free RAM
> (we don't really care to free swap, system needs RAM at oom time).
> Freeing swap won't immediately help because no RAM is freed when swap
> is released (sure other tasks that sits huge in RAM can be moved to
> swap after swap isn't full but if we immediately killed those tasks
> that were huge in RAM in the first place we'd be better off).
> 
Okay.

As first step, I'll divide this into 
   - replace total_vm with anon_rss/file_rss patch
   - swap accounting
   - a patch for consider whether swap amount should be included or not.

Then, necessary part will go early. And backport will be easy.

Thanks,
-Kame


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