From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932418AbcEKOfh (ORCPT ); Wed, 11 May 2016 10:35:37 -0400 Received: from www.linutronix.de ([62.245.132.108]:49114 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751637AbcEKOfg (ORCPT ); Wed, 11 May 2016 10:35:36 -0400 Date: Wed, 11 May 2016 16:33:44 +0200 (CEST) From: Thomas Gleixner To: Tetsuo Handa cc: peterz@infradead.org, mingo@kernel.org, akpm@linux-foundation.org, mgorman@techsingularity.net, mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: x86_64 Question: Are concurrent IPI requests safe? In-Reply-To: <201605112309.AGJ18252.tOFMFQOJFLSOVH@I-love.SAKURA.ne.jp> Message-ID: References: <201605061958.HHG48967.JVFtSLFQOFOOMH@I-love.SAKURA.ne.jp> <201605092354.AHF82313.FtQFOMVOFJLOSH@I-love.SAKURA.ne.jp> <201605112219.HEB64012.FLQOFMJOVOtFHS@I-love.SAKURA.ne.jp> <20160511133928.GF3192@twins.programming.kicks-ass.net> <201605112309.AGJ18252.tOFMFQOJFLSOVH@I-love.SAKURA.ne.jp> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 11 May 2016, Tetsuo Handa wrote: > Peter Zijlstra wrote: > > On Wed, May 11, 2016 at 10:19:16PM +0900, Tetsuo Handa wrote: > > > [ 180.434659] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 > > > > can you reproduce on real hardware? > > > Unfortunately, I don't have a real hardware to run development kernels. > > My Linux environment is limited to 4 CPUs / 1024MB or 2048MB RAM running > as a VMware guest on Windows. Can somebody try KVM environment with > 4 CPUs / 1024MB or 2048MB RAM whith partition only plain /dev/sda1 > formatted as XFS? Can you trigger a back trace on all cpus when the watchdog triggers? Thanks, tglx