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

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Message-ID: <20100418213238.2e62eac7@infradead.org>
Date:	Sun, 18 Apr 2010 21:32:38 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	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 Mon, 19 Apr 2010 11:08:05 +1000
Dave Chinner <david@...morbit.com> wrote:

> > Maybe we need to do the background dirty writes a bit more
> > aggressive... or play with heuristics where we get an adaptive
> > timeout (say, if the file got closed by the last opener, then do a
> > shorter timeout)
> 
> Realistically, I'm concerned about preventing the worst case
> behaviour from occurring - making the background writes more
> agressive without preventing writeback in LRU order simply means it
> will be harder to test the VM corner case that triggers these
> writeout patterns...


while I appreciate that the worst case should not be uber horrific...
I care a LOT about getting the normal case right... and am willing to
sacrifice the worst case for that.. (obviously not to infinity, it
needs to be bounded)

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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