From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 8843D6B01D4 for ; Mon, 14 Jun 2010 16:57:37 -0400 (EDT) Subject: Re: [PATCH 03/12] tracing, vmscan: Add trace event when a page is written From: Larry Woodman In-Reply-To: <1276514273-27693-4-git-send-email-mel@csn.ul.ie> References: <1276514273-27693-1-git-send-email-mel@csn.ul.ie> <1276514273-27693-4-git-send-email-mel@csn.ul.ie> Content-Type: text/plain Date: Mon, 14 Jun 2010 17:02:51 -0400 Message-Id: <1276549371.8736.105.camel@dhcp-100-19-198.bos.redhat.com> Mime-Version: 1.0 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 , Rik van Riel , Johannes Weiner , Christoph Hellwig , KAMEZAWA Hiroyuki , Andrew Morton List-ID: On Mon, 2010-06-14 at 12:17 +0100, 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: Larry Woodman -- 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