linux-kernel - Re: [PATCH 03/17] writeback: introduce writeback_control.inodes

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Date:	Fri, 13 May 2011 08:44:20 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/17] writeback: introduce
 writeback_control.inodes_cleaned

On Thu, May 12, 2011 at 09:57:09PM +0800, Wu Fengguang wrote:
> The flusher works on dirty inodes in batches, and may quit prematurely
> if the batch of inodes happen to be metadata-only dirtied: in this case
> wbc->nr_to_write won't be decreased at all, which stands for "no pages
> written" but also mis-interpreted as "no progress".
> 
> So introduce writeback_control.inodes_cleaned to count the inodes get
> cleaned.  A non-zero value means there are some progress on writeback,
> in which case more writeback can be tried.

Why introduce a new field for this? Just decrement nr_to_write for
every write_inode() call made in writeback_single_inode()....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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