From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 7 Jan 2008 14:32:17 -0500 From: Rik van Riel Subject: Re: [patch 00/19] VM pageout scalability improvements Message-ID: <20080107143217.11b0fce1@bree.surriel.com> In-Reply-To: References: <20080102224144.885671949@redhat.com> <1199379128.5295.21.camel@localhost> <20080103120000.1768f220@cuia.boston.redhat.com> <1199380412.5295.29.camel@localhost> <20080103170035.105d22c8@cuia.boston.redhat.com> <1199463934.5290.20.camel@localhost> <1199466372.5290.37.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: Lee Schermerhorn , Andi Kleen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Eric Whitney , Nick Dokos List-ID: On Mon, 7 Jan 2008 11:07:54 -0800 (PST) Christoph Lameter wrote: > On Fri, 4 Jan 2008, Lee Schermerhorn wrote: > > > We see this on both NUMA and non-NUMA. x86_64 and ia64. The basic > > criteria to reproduce is to be able to run thousands [or low 10s of > > thousands] of tasks, continually increasing the number until the system > > just goes into reclaim. Instead of swapping, the system seems to > > hang--unresponsive from the console, but with "soft lockup" messages > > spitting out every few seconds... > > Ditto here. I have some suspicions on what could be causing this. The most obvious suspect is get_scan_ratio() continuing to return 100 file reclaim, 0 anon reclaim when the file LRUs have already been reduced to something very small, because reclaiming up to that point was easy. I plan to add some code to automatically set the anon reclaim to 100% if (free + file_active + file_inactive <= zone->pages_high), meaning that reclaiming just file pages will not be able to free enough pages. -- 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