From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM Date: Fri, 14 Mar 2014 09:42:31 +0100 Message-ID: <5322C0F7.2090604@redhat.com> References: <1394650498-30118-1-git-send-email-Waiman.Long@hp.com> <1394650498-30118-11-git-send-email-Waiman.Long@hp.com> <5321B9BE.7050209@redhat.com> <5322035B.5000205@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5322035B.5000205@hp.com> 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: Waiman Long Cc: Jeremy Fitzhardinge , Raghavendra K T , linux-kernel@vger, Gleb Natapov , Peter Zijlstra , virtualization@lists.linux-foundation.org, Andi Kleen , "H. Peter Anvin" , Michel Lespinasse , Alok Kataria , linux-arch@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org, Ingo Molnar , xen-devel@lists.xenproject.org, "Paul E. McKenney" , Arnd Bergmann , Scott J Norton , Steven Rostedt , Chris Wright , Thomas Gleixner , Aswin Chandramouleeswaran , Chegu Vinod , Boris Ostrovsky , Oleg Nesterov List-Id: linux-arch.vger.kernel.org Il 13/03/2014 20:13, Waiman Long ha scritto: >>> >> >> This should also disable the unfair path. >> >> Paolo >> > > The unfair lock uses a different jump label and does not require any > special PV ops. There is a separate init function for that. Yeah, what I mean is that the patches that enable paravirtualization should also take care of decreasing the unfair-lock jump label when paravirtualization is enabled. Paolo