linux-kernel - Re: [PATCH 17/18] writeback: fix dirtied pages accounting on redirty

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Message-ID: <20110907164619.GA10593@lst.de>
Date:	Wed, 7 Sep 2011 18:46:19 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jan Kara <jack@...e.cz>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@....de>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 17/18] writeback: fix dirtied pages accounting on
	redirty

On Wed, Sep 07, 2011 at 06:42:16PM +0200, Jan Kara wrote:
>   Well, it depends on what you call common - usually, ->writepage is called
> from kswapd which shouldn't be common compared to writeback from a flusher
> thread. But now I've realized that JBD2 also calls ->writepage to fulfill
> data=ordered mode guarantees and that's what causes most of redirtying of
> pages on ext4. That's going away eventually but it will take some time. So
> for now writeback has to handle redirtying...

Under the "right" loads it may also happen for xfs because we can't
take lock non-blockingly in the fluser thread for example.

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