linux-kernel - Re: [RFC PATCH 1/2] vmscan don't isolate too many pages in a zone

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Message-Id: <20090709153753.23AD.A69D9226@jp.fujitsu.com>
Date:	Thu,  9 Jul 2009 15:39:20 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [RFC PATCH 1/2] vmscan don't isolate too many pages in a zone

Hi

> When way too many processes go into direct reclaim, it is possible
> for all of the pages to be taken off the LRU.  One result of this
> is that the next process in the page reclaim code thinks there are
> no reclaimable pages left and triggers an out of memory kill.
> 
> One solution to this problem is to never let so many processes into
> the page reclaim path that the entire LRU is emptied.  Limiting the
> system to only having half of each inactive list isolated for
> reclaim should be safe.

Thanks good patch.
I'd like to run several benchmark and compare my and your patches.

Can you please gime me few days?



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