linux-kernel - Re: [PATCH] writeback: avoid possible balance_dirty

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Message-ID: <20071002132702.GA10967@mail.ustc.edu.cn>
Date:	Tue, 2 Oct 2007 21:27:02 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chuck Ebbert <cebbert@...hat.com>, Greg KH <gregkh@...e.de>,
	Chakri n <chakriin5@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Krzysztof Oledzki <olel@....pl>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	richard kennedy <richard@....demon.co.uk>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] writeback: avoid possible balance_dirty_pages() lockup
	on a light-load bdi

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...

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