From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932095AbZJ0SUU (ORCPT ); Tue, 27 Oct 2009 14:20:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756640AbZJ0SUR (ORCPT ); Tue, 27 Oct 2009 14:20:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41091 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756635AbZJ0SUP (ORCPT ); Tue, 27 Oct 2009 14:20:15 -0400 Message-ID: <4AE7397A.4010907@redhat.com> Date: Tue, 27 Oct 2009 14:18:34 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4pre) Gecko/20090922 Fedora/3.0-3.9.b4.fc12 Lightning/1.0pre Thunderbird/3.0b4 MIME-Version: 1.0 To: Mel Gorman CC: Andrew Morton , stable@kernel.org, linux-kernel@vger.kernel.org, " , Kernel Testers List "@redhat.com Subject: Re: [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit References: <1256650833-15516-1-git-send-email-mel@csn.ul.ie> <1256650833-15516-4-git-send-email-mel@csn.ul.ie> In-Reply-To: <1256650833-15516-4-git-send-email-mel@csn.ul.ie> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/27/2009 09:40 AM, Mel Gorman wrote: > When a high-order allocation fails, kswapd is kicked so that it reclaims > at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC > allocations. Something has changed in recent kernels that affect the timing > where high-order GFP_ATOMIC allocations are now failing with more frequency, > particularly under pressure. This patch forces kswapd to notice sooner that > high-order allocations are occuring. > > Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel -- All rights reversed.