From mboxrd@z Thu Jan  1 00:00:00 1970
From: Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH 1/3] writeback: Account for time spent congestion_waited
Date: Fri, 27 Aug 2010 02:23:38 +0900
Message-ID: <20100826172338.GB6873@barrios-desktop>
References: <1282835656-5638-1-git-send-email-mel@csn.ul.ie>
 <1282835656-5638-2-git-send-email-mel@csn.ul.ie>
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Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
	linux-kernel@vger.kernel.org
To: Mel Gorman <mel@csn.ul.ie>
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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@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>

I think that's enough to add tracepoint until solving this issue at least.

-- 
Kind regards,
Minchan Kim