From mboxrd@z Thu Jan 1 00:00:00 1970 From: Waiman Long Subject: Re: [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support Date: Thu, 17 Apr 2014 21:48:36 -0400 Message-ID: <53508474.7010402@hp.com> References: <1397747051-15401-1-git-send-email-Waiman.Long@hp.com> <20140417172246.GA9849@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140417172246.GA9849@localhost.localdomain> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Konrad Rzeszutek Wilk Cc: linux-arch@vger.kernel.org, Rik van Riel , Raghavendra K T , Gleb Natapov , kvm@vger.kernel.org, Peter Zijlstra , Scott J Norton , x86@kernel.org, Paolo Bonzini , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Ingo Molnar , Chegu Vinod , David Vrabel , "H. Peter Anvin" , xen-devel@lists.xenproject.org, Thomas Gleixner , "Paul E. McKenney" , Linus Torvalds , Oleg Nesterov List-Id: linux-arch.vger.kernel.org On 04/17/2014 01:23 PM, Konrad Rzeszutek Wilk wrote: > On Thu, Apr 17, 2014 at 11:03:52AM -0400, Waiman Long wrote: >> v8->v9: >> - Integrate PeterZ's version of the queue spinlock patch with some >> modification: >> http://lkml.kernel.org/r/20140310154236.038181843@infradead.org >> - Break the more complex patches into smaller ones to ease review effort. >> - Fix a racing condition in the PV qspinlock code. > I am not seeing anything mentioning that the overcommit scenario > for KVM and Xen had been fixed. Or was the 'racing condition' said > issue? > > Thanks. The hanging is caused by a racing condition which should be fixed in the v9 patch. Please let me know if you are still seeing it. -Longman From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from g4t3426.houston.hp.com ([15.201.208.54]:28888 "EHLO g4t3426.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750970AbaDRBsl (ORCPT ); Thu, 17 Apr 2014 21:48:41 -0400 Message-ID: <53508474.7010402@hp.com> Date: Thu, 17 Apr 2014 21:48:36 -0400 From: Waiman Long MIME-Version: 1.0 Subject: Re: [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support References: <1397747051-15401-1-git-send-email-Waiman.Long@hp.com> <20140417172246.GA9849@localhost.localdomain> In-Reply-To: <20140417172246.GA9849@localhost.localdomain> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: Konrad Rzeszutek Wilk Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Peter Zijlstra , linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Paolo Bonzini , "Paul E. McKenney" , Rik van Riel , Linus Torvalds , Raghavendra K T , David Vrabel , Oleg Nesterov , Gleb Natapov , Scott J Norton , Chegu Vinod Message-ID: <20140418014836.mG6ewkd-Ug2asW9TWGQ-4Ro4j7hZ3GV88pdsxUNPJtk@z> On 04/17/2014 01:23 PM, Konrad Rzeszutek Wilk wrote: > On Thu, Apr 17, 2014 at 11:03:52AM -0400, Waiman Long wrote: >> v8->v9: >> - Integrate PeterZ's version of the queue spinlock patch with some >> modification: >> http://lkml.kernel.org/r/20140310154236.038181843@infradead.org >> - Break the more complex patches into smaller ones to ease review effort. >> - Fix a racing condition in the PV qspinlock code. > I am not seeing anything mentioning that the overcommit scenario > for KVM and Xen had been fixed. Or was the 'racing condition' said > issue? > > Thanks. The hanging is caused by a racing condition which should be fixed in the v9 patch. Please let me know if you are still seeing it. -Longman