From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id 674F96B01DA for ; Mon, 14 Jun 2010 13:38:08 -0400 (EDT) Message-ID: <4C165D58.9090609@redhat.com> Date: Mon, 14 Jun 2010 12:48:24 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 03/12] tracing, vmscan: Add trace event when a page is written References: <1276514273-27693-1-git-send-email-mel@csn.ul.ie> <1276514273-27693-4-git-send-email-mel@csn.ul.ie> In-Reply-To: <1276514273-27693-4-git-send-email-mel@csn.ul.ie> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Dave Chinner , Chris Mason , Nick Piggin , Johannes Weiner , Christoph Hellwig , KAMEZAWA Hiroyuki , Andrew Morton List-ID: 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 Acked-by: Rik van Riel -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org