From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752030Ab1JUGgk (ORCPT ); Fri, 21 Oct 2011 02:36:40 -0400 Received: from server655-han.de-nserver.de ([85.158.177.45]:54692 "EHLO server655-han.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750933Ab1JUGgj (ORCPT ); Fri, 21 Oct 2011 02:36:39 -0400 Message-ID: <4EA112F4.3040708@profihost.ag> Date: Fri, 21 Oct 2011 08:36:36 +0200 From: Philipp Herz - Profihost AG Reply-To: p.herz@profihost.ag User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Thunderbird/3.1.15 MIME-Version: 1.0 To: Valdis.Kletnieks@vt.edu CC: Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: Vanilla-Kernel 3 - page allocation failure References: <4E9D53FF.7090609@profihost.ag> <16605.1319145104@turing-police.cc.vt.edu> In-Reply-To: <16605.1319145104@turing-police.cc.vt.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-User-Auth: Auth by p.herz@profihost.ag through 85.158.179.66 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Tue, 18 Oct 2011 08:51:54 PDT, Andi Kleen said: >> Philipp Herz - Profihost AG writes: >> >>> After updating kernel (x86_64) to stable version 3 there are a few >>> messages appearing in the kernel log such as >>> >>> kworker/0:1: page allocation failure: order:1, mode:0x20 >>> mysql: page allocation failure: order:1, mode:0x20 >>> php5: page allocation failure: order:1, mode:0x20 >> >> You just ran out of memory. > > I read it as "Why is this happening when the previous kernel didn't have > this issue?", which is a *much* more complicated question... Exactly, that was the intention of my post. It would me nice to know, if these messages do require to focus on memory statitics? Looking at our monitoring data, the system does have enough memory available. How do processes get effected, when they are running into situations where kernel memory manager tells them about "page allocation failure"? Is it just meant to be a warning/debugging message new to current kernel version 3? How can we solve the situation? Getting rid of these message, by - just suppressing - increasing system's memory - change kernel and/or kernel runtime config ? Kind regards, Philipp