linux-kernel - Re: [RFC][-mm][PATCH 5/6] oom-killer: check last total

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Date:	Tue, 3 Nov 2009 12:29:39 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	minchan.kim@...il.com, vedran.furac@...il.com,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: [RFC][-mm][PATCH 5/6] oom-killer: check last total_vm
 expansion

On Mon, 2 Nov 2009, KAMEZAWA Hiroyuki wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> At considering oom-kill algorithm, we can't avoid to take runtime
> into account. But this can adds too big bonus to slow-memory-leaker.
> For adding penalty to slow-memory-leaker, we record jiffies of
> the last mm->hiwater_vm expansion. That catches processes which leak
> memory periodically.
> 

No, it doesn't, it simply measures the last time the hiwater mark was 
increased.  That could have increased by a single page in the last tick 
with no increase in memory consumption over the past year and then its 
unfairly biased against for quiet_time in the new oom kill heuristic 
(patch 6).  Using this as part of the badness scoring is ill conceived 
because it doesn't necessarily indicate a memory leaking task, just one 
that has recently allocated memory.
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