linux-kernel - Re: [PATCH] mm: disallow direct reclaim page writeback

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Date:	Sun, 18 Apr 2010 15:35:45 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Hellwig <hch@...radead.org>, Mel Gorman <mel@....ul.ie>,
	Dave Chinner <david@...morbit.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] mm: disallow direct reclaim page writeback

On Sun, Apr 18, 2010 at 12:31:09PM -0400, Andrew Morton wrote:
> Yeah, but it's all bandaids.  The first thing we should do is work out
> why writeout-off-the-LRU increased so much and fix that.
> 
> Handing writeout off to separate threads might be used to solve the
> stack consumption problem but we shouldn't use it to "solve" the
> excess-writeout-from-page-reclaim problem.

I think both of them are really serious issue.  Exposing the whole
stack and lock problems with direct reclaim are a bit of a positive
side-effect os the writeout tuning messup.  Without it the problems
would still be just as harmfull, just happenening even less often and
thus getting even less attention.

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