linux-kernel - Re: regression in page writeback

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Message-Id: <1253697811.7695.127.camel@twins>
Date:	Wed, 23 Sep 2009 11:23:31 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Richard Kennedy <richard@....demon.co.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Chris Mason <chris.mason@...cle.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>
Subject: Re: regression in page writeback

On Wed, 2009-09-23 at 10:19 +0100, Richard Kennedy wrote:
> 
> I am concerned that the background writeout no longer stops when it
> reaches the background threshold, as balance_dirty_pages requests all
> dirty pages to be written. No doubt this is good for large linear writes
> but what about more random write workloads? 

I've not had time to look over the current code, but write-out not
stopping on reaching background threshold is a definite bug and needs to
get fixed.

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