linux-kernel - Re: [RFC][PATCH] split file and anonymous page queues #3

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Message-ID: <17920.61568.770999.626623@gargle.gargle.HOWL>
Date:	Wed, 21 Mar 2007 11:44:48 +0300
From:	Nikita Danilov <nikita@...sterfs.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH] split file and anonymous page queues #3

Rik van Riel writes:
 > [ OK, I suck.  I edited yesterday's email with the new info, but forgot
 >    to change the attachment to today's patch.  Here is today's patch. ]
 > 
 > Split the anonymous and file backed pages out onto their own pageout
 > queues.  This we do not unnecessarily churn through lots of anonymous
 > pages when we do not want to swap them out anyway.

Won't this re-introduce problems similar to ones due to split
inactive_clean/inactive_dirty queues we had in the past?

For example, by rotating anon queues faster than file queues, kernel
would end up reclaiming anon pages that are hotter (in "absolute" LRU
order) than some file pages.

Nikita.

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