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

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Message-ID: <20090923150510.GB23126@kernel.dk>
Date:	Wed, 23 Sep 2009 17:05:10 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Wu Fengguang <fengguang.wu@...el.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, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] writeback: stop background writeback when below
	background threshold

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?

-- 
Jens Axboe

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