From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [RFC][PATCH 0/7] locking: qspinlock Date: Wed, 12 Mar 2014 16:57:54 +0100 Message-ID: <20140312155754.GG27965@twins.programming.kicks-ass.net> References: <20140310154236.038181843@infradead.org> <20140312023153.GW13647@dastard> <20140311231159.25a0d8dc@gandalf.local.home> <20140312042616.GX13647@dastard> <20140312060730.435122f0@gandalf.local.home> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from merlin.infradead.org ([205.233.59.134]:37280 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754877AbaCLP6S (ORCPT ); Wed, 12 Mar 2014 11:58:18 -0400 Content-Disposition: inline In-Reply-To: <20140312060730.435122f0@gandalf.local.home> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Steven Rostedt Cc: Dave Chinner , Waiman Long , arnd@arndb.de, linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, walken@google.com, andi@firstfloor.org, riel@redhat.com, paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org, oleg@redhat.com On Wed, Mar 12, 2014 at 06:07:30AM -0400, Steven Rostedt wrote: > On Wed, 12 Mar 2014 15:26:16 +1100 > Dave Chinner wrote: > > > > I did apply them manually - but the patchset is based on the > > tip/master, plus some patches from a previous patch set that aren't > > in tip/locking to be able to apply this patchset cleanly in the > > first place. So there's no "start froma known working kernel" case > > that applies here :/ > > Peter, > > Which kernel should we start testing your code against? I build and booted these patches against tip/master as of this morning. It build ~50 defconfig kernels on my WSM-EP. I've not managed to reproduce the hang as reported by Dave, but then I doubt building kernels has anywhere near the lock contention he generated. I did run my userspace on both the WSM-EP as well as the Interlagos box, topping out at 24 and 32 contending cpus resp. No weird lockups :/