From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964933AbWGHSGn (ORCPT ); Sat, 8 Jul 2006 14:06:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964934AbWGHSGb (ORCPT ); Sat, 8 Jul 2006 14:06:31 -0400 Received: from shawidc-mo1.cg.shawcable.net ([24.71.223.10]:39230 "EHLO pd4mo3so.prod.shaw.ca") by vger.kernel.org with ESMTP id S964933AbWGHSGR (ORCPT ); Sat, 8 Jul 2006 14:06:17 -0400 Date: Sat, 08 Jul 2006 12:06:13 -0600 From: Robert Hancock Subject: Re: Commenting out out_of_memory() function in __alloc_pages() In-reply-to: To: "Abu M. Muttalib" Cc: kernelnewbies@nl.linux.org, linux-newbie@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm Message-id: <44AFF415.2020305@shaw.ca> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit References: User-Agent: Thunderbird 1.5.0.4 (Windows/20060516) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Abu M. Muttalib wrote: > Hi, > > I am getting the Out of memory. > > To circumvent the problem, I have commented the call to "out_of_memory(), > and replaced "goto restart" with "goto nopage". > > At "nopage:" lable I have added a call to "schedule()" and then "return > NULL" after "schedule()". Bad idea - in the configuration you have, the system may need the out-of-memory killer to free up memory, otherwise the system can deadlock due to all memory being exhausted. > > I tried the modified kernel with a test application, the test application is > mallocing memory in a loop. Unlike as expected the process gets killed. On > second run of the same application I am getting the page allocation failure > as expected but subsequently the system hangs. > > I am attaching the test application and the log herewith. > > I am getting this exception with kernel 2.6.13. With kernel > 2.4.19-rmka7-pxa1 there was no problem. > > Why its so? What can I do to alleviate the OOM problem? Please see Documentation/vm/overcommit-accounting in the kernel source tree. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/