linux-kernel - Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim

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Message-Id: <20100706093529.CCD1.A69D9226@jp.fujitsu.com>
Date:	Tue,  6 Jul 2010 09:36:41 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim

Hello,

> Ok, that's reasonable as I'm still working on that patch. For example, the
> patch disabled anonymous page writeback which is unnecessary as the stack
> usage for anon writeback is less than file writeback. 

How do we examine swap-on-file?

> Second, using systemtap,
> I was able to see that file-backed dirty pages have a tendency to be near the
> end of the LRU even though they are a small percentage of the overall pages
> in the LRU. I'm hoping to figure out why this is as it would make avoiding
> writeback a lot less controversial.




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