From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chuck Ebbert <cebbert@redhat.com>
Subject: Re: [PATCH] writeback: avoid possible
 balance_dirty_pages() lockup on a light-load bdi
Date: Tue, 02 Oct 2007 14:35:49 -0400
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To: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Chakri n <chakriin5@gmail.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Greg KH <gregkh@suse.de>, lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>, Krzysztof Oledzki <olel@ans.pl>, Andrew Morton <akpm@linux-foundation.org>, richard kennedy <richard@rsk.demon.co.uk>, linux-pm <linux-pm@lists.linux-foundation.org>
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On 10/02/2007 09:27 AM, Fengguang Wu wrote:
> On Tue, Oct 02, 2007 at 08:13:27PM +0800, Fengguang Wu wrote:
> [...]
>> One more serious problem is, a busy writer could also drain all the
>> dirty pages and make (nr_writeback == dirty_limit+1MB). In that case,
>> I suspect the light-load sdb writer still have good chance to
>> make progress(need confirmation).
> 
> Well it seems to be a really tricky issue without knowing the per-bdi
> numbers. Maybe we could just encourage users to upgrade to 2.6.24...
> 

Yeah, and if that doesn't work there's always 2.6.25... :/