linux-kernel - Re: [PATCH 03/13] writeback: per-task rate limit on balance_dirty

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Message-ID: <1290594187.2072.440.camel@laptop>
Date:	Wed, 24 Nov 2010 11:23:07 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
	Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Theodore Ts'o <tytso@....edu>,
	Chris Mason <chris.mason@...cle.com>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm <linux-mm@...ck.org>, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/13] writeback: per-task rate limit on
 balance_dirty_pages()

On Wed, 2010-11-17 at 12:27 +0800, Wu Fengguang wrote:
> +       if (unlikely(current->nr_dirtied >= current->nr_dirtied_pause ||
> +                    bdi->dirty_exceeded)) {
> +               balance_dirty_pages(mapping, current->nr_dirtied);
> +               current->nr_dirtied = 0;
>         } 

Was it a conscious choice to use
  current->nr_dirtied = 0
over 
  current->nr_dirtied -= current->nr_dirtied_pause
?

The former will cause a drift in pause times due to truncation of the
excess.
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