linux-kernel - Re: [PATCH 2/6] writeback: stop background writeback when below background threshold

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Date:	Thu, 24 Sep 2009 09:24:05 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Theodore Ts'o <tytso@....edu>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] writeback: stop background writeback when below
	background threshold

On Wed, Sep 23, 2009 at 11:05:10PM +0800, Jens Axboe wrote:
> On Wed, Sep 23 2009, Wu Fengguang wrote:
> > Treat bdi_start_writeback(0) as a special request to do background write,
> > and stop such work when we are below the background dirty threshold.
> > 
> > Also simplify the (nr_pages <= 0) checks. Since we already pass in
> > nr_pages=LONG_MAX for WB_SYNC_ALL and background writes, we don't
> > need to worry about it being decreased to zero.
> 
> Good cleanup! Do you want me to collect these fixes, or how shall we
> handle this?

Thanks. I'm feeling OK with these patches(except the last one) as well
as Jan's busy loop fixing patch. Can you pull them to your tree?

Thanks,
Fengguang
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