linux-kernel - Re: [PATCH 06/13] writeback: bdi write bandwidth estimation

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Message-ID: <1290596302.2072.445.camel@laptop>
Date:	Wed, 24 Nov 2010 11:58:22 +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>,
	Li Shaohua <shaohua.li@...el.com>,
	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 06/13] writeback: bdi write bandwidth estimation

On Wed, 2010-11-17 at 12:27 +0800, Wu Fengguang wrote:

> @@ -555,8 +592,10 @@ static void balance_dirty_pages(struct a
>  		pause = clamp_val(pause, 1, HZ/10);
>  
>  pause:
> +		bdi_update_write_bandwidth(bdi, &bw_time, &bw_written);
>  		__set_current_state(TASK_INTERRUPTIBLE);
>  		io_schedule_timeout(pause);
> +		bdi_update_write_bandwidth(bdi, &bw_time, &bw_written);
>  
>  		/*
>  		 * The bdi thresh is somehow "soft" limit derived from the

So its really a two part bandwidth calculation, the first call is:

  bdi_get_bandwidth()

and the second call is:

  bdi_update_bandwidth()

Would it make sense to actually implement it with two functions instead
of overloading the functionality of the one function?
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