From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 03/12] tracing, vmscan: Add trace event when a page is
 written
Date: Mon, 14 Jun 2010 12:48:24 -0400
Message-ID: <4C165D58.9090609@redhat.com>
References: <1276514273-27693-1-git-send-email-mel@csn.ul.ie> <1276514273-27693-4-git-send-email-mel@csn.ul.ie>
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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>
To: Mel Gorman <mel@csn.ul.ie>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <1276514273-27693-4-git-send-email-mel@csn.ul.ie>
Sender: owner-linux-mm@kvack.org
List-Id: linux-fsdevel.vger.kernel.org

On 06/14/2010 07:17 AM, Mel Gorman wrote:
> This patch adds a trace event for when page reclaim queues a page for IO and
> records whether it is synchronous or asynchronous. Excessive synchronous
> IO for a process can result in noticeable stalls during direct reclaim.
> Excessive IO from page reclaim may indicate that the system is seriously
> under provisioned for the amount of dirty pages that exist.
>
> Signed-off-by: Mel Gorman<mel@csn.ul.ie>

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

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