From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752318Ab1CQAS2 (ORCPT ); Wed, 16 Mar 2011 20:18:28 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:55806 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751048Ab1CQASY (ORCPT ); Wed, 16 Mar 2011 20:18:24 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: paulmck@linux.vnet.ibm.com Subject: Re: rcu_sched_state detected stall on CPU issue Cc: kosaki.motohiro@jp.fujitsu.com, mel@csn.ul.ie, akpm@linux-foundation.org, -c@linux.vnet.ibm.com, linux-kernel@vger.kernel.org In-Reply-To: <20110316101820.GA17540@linux.vnet.ibm.com> References: <20110316101820.GA17540@linux.vnet.ibm.com> Message-Id: <20110317085938.C938.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 17 Mar 2011 09:18:19 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Paul, > Hello! > > It looks like Preeti found a way to loop in kswapd with preemption > disabled, please see attached dmesg. This is using 2.6.35-45.fc14. > > Any thoughts or recent patches that might help? We fixed a kswapd infinite loop issue when memory is fragmented at 2.6.38. Could you please try following commits? (all are mm/vmscan.c change) commit dc83edd941f412e938841b4989be24aa288a1aa6 commit 355b09c47a0cbb73b3e65a57c03f157f2e7ddb0b commit 4d40502ea580c35414a1466d86f96484910ebaec commit 0abdee2bd4118366c62349a304f81537be69af33 commit 1741c87757448cedd03224f01586504f9256415d commit 9950474883e027e6e728cbcff25f7f2bf0c96530 And, your attached file and your quoted mail don't have /proc/zoneinfo information. then I have no way to confirn his environment is heavy fragmented or not. If possible, could you please get /proc/zoneinfo info?