From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759698AbYGAPDm (ORCPT ); Tue, 1 Jul 2008 11:03:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757152AbYGAPDc (ORCPT ); Tue, 1 Jul 2008 11:03:32 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:49887 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756999AbYGAPDb (ORCPT ); Tue, 1 Jul 2008 11:03:31 -0400 Date: Tue, 1 Jul 2008 17:03:13 +0200 From: Ingo Molnar To: Mike Travis Cc: Jeremy Fitzhardinge , "Eric W. Biederman" , Christoph Lameter , "H. Peter Anvin" , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [RFC 0/5] percpu: Optimize percpu accesses Message-ID: <20080701150313.GA30476@elte.hu> References: <20080701121634.865966000@polaris-admin.engr.sgi.com> <20080701145417.GB18522@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080701145417.GB18522@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ingo Molnar wrote: > > This patchset provides the following: > > > > * Cleanup: Fix early references to cpumask_of_cpu(0) > > * Generic: Percpu infrastructure to rebase the per cpu area to zero > > * x86_64: Fold pda into per cpu area > > * x86_64: Rebase per cpu variables to zero > > thanks Mike - i've started testing it in -tip. One small merge fallout > fix is below. (it's for the new generic-ipi topic that was not in > tip/master yet when you merged percpu-zerobased to it) ok, -tip testing found an early boot crash caused by your patchset, on 64-bit x86: [ 0.396000] calling net_ns_init+0x0/0x143 [ 0.400000] net_namespace: 944 bytes [ 0.403578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 0.404000] IP: [] net_ns_init+0x9f/0x143 [ 0.404000] PGD 0 [ 0.404000] Oops: 0000 [1] SMP [ 0.404000] CPU 0 [...] full bootlog and config can be found at: http://redhat.com/~mingo/misc/crashlog-Tue_Jul__1_16_48_45_CEST_2008.bad http://redhat.com/~mingo/misc/config-Tue_Jul__1_16_48_45_CEST_2008.bad (another 64-bit testbox crashed as well, so this should be readily reproducible.) i've pushed this tree out to tip/tmp.core/percpu-zerobased.Jul__1_16_48 topic branch, that is the 2.6.26-rc8-tip-00250-g90874b0 kernel you can see in the crashlog. Ingo