linux-kernel - Re: [PATCH 1/3] writeback: Account for time spent congestion

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Message-ID: <20100826181050.GA6805@cmpxchg.org>
Date:	Thu, 26 Aug 2010 20:10:50 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] writeback: Account for time spent congestion_waited

On Thu, Aug 26, 2010 at 04:14:14PM +0100, Mel Gorman wrote:
> There is strong evidence to indicate a lot of time is being spent in
> congestion_wait(), some of it unnecessarily. This patch adds a
> tracepoint for congestion_wait to record when congestion_wait() occurred
> and how long was spent.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>

Reviewed-by: Johannes Weiner <hannes@...xchg.org>
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