Message-ID: <4C164EA0.30308@redhat.com>
Date: Mon, 14 Jun 2010 11:45:36 -0400
From: Rik van Riel <riel@redhat.com>
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To: Mel Gorman <mel@csn.ul.ie>
CC: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       linux-mm@kvack.org, Dave Chinner <david@fromorbit.com>,
       Chris Mason <chris.mason@oracle.com>, Nick Piggin <npiggin@suse.de>,
       Johannes Weiner <hannes@cmpxchg.org>,
       Christoph Hellwig <hch@infradead.org>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 01/12] tracing, vmscan: Add trace events for kswapd wakeup,
 sleeping and direct reclaim
References: <1276514273-27693-1-git-send-email-mel@csn.ul.ie> <1276514273-27693-2-git-send-email-mel@csn.ul.ie>
In-Reply-To: <1276514273-27693-2-git-send-email-mel@csn.ul.ie>
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On 06/14/2010 07:17 AM, Mel Gorman wrote:
> This patch adds two trace events for kswapd waking up and going asleep for
> the purposes of tracking kswapd activity and two trace events for direct
> reclaim beginning and ending. The information can be used to work out how
> much time a process or the system is spending on the reclamation of pages
> and in the case of direct reclaim, how many pages were reclaimed for that
> process.  High frequency triggering of these events could point to memory
> pressure problems.
>
> Signed-off-by: Mel Gorman<mel@csn.ul.ie>

Acked-by: Rik van Riel <riel@redhat.com>

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