From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 699AF6B02AD for ; Thu, 5 Aug 2010 11:01:39 -0400 (EDT) Date: Thu, 5 Aug 2010 16:02:32 +0100 From: Mel Gorman Subject: Re: [PATCH 1/7] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls Message-ID: <20100805150232.GE25688@csn.ul.ie> References: <20100805150624.31B7.A69D9226@jp.fujitsu.com> <20100805151125.31BA.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20100805151125.31BA.A69D9226@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: LKML , linux-mm , Andrew Morton , Johannes Weiner , Wu Fengguang , Minchan Kim , Rik van Riel List-ID: On Thu, Aug 05, 2010 at 03:12:22PM +0900, KOSAKI Motohiro wrote: > From: Wu Fengguang > > Fix "system goes unresponsive under memory pressure and lots of > dirty/writeback pages" bug. > > http://lkml.org/lkml/2010/4/4/86 > > In the above thread, Andreas Mohr described that > > Invoking any command locked up for minutes (note that I'm > talking about attempted additional I/O to the _other_, > _unaffected_ main system HDD - such as loading some shell > binaries -, NOT the external SSD18M!!). > > This happens when the two conditions are both meet: > - under memory pressure > - writing heavily to a slow device > > Other than an unnecessary whitespace removal at the end of the patch, I see no problem with letting this patch stand on it's own as we are reasonably sure this patch fixes a problem on its own. Patches 2-7 might further improve the situation but can be considered as a new series. This patch (as well as most of the series) will reject against current mmotm because of other reclaim-related patches already in there. The resolutions are not too hard but bear it in mind. > -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- 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