From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755499AbbIHRpK (ORCPT ); Tue, 8 Sep 2015 13:45:10 -0400 Received: from mail-io0-f171.google.com ([209.85.223.171]:32918 "EHLO mail-io0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753238AbbIHRpH (ORCPT ); Tue, 8 Sep 2015 13:45:07 -0400 MIME-Version: 1.0 In-Reply-To: <20150908100551.GC3644@twins.programming.kicks-ass.net> References: <20150904054820.GY3902@dastard> <20150904071143.GZ3902@dastard> <20150904082954.GB3902@dastard> <20150904151427.GG18489@twins.programming.kicks-ass.net> <20150904152523.GR18673@twins.programming.kicks-ass.net> <20150907000546.GA27993@linux-q0g1.site> <20150907065703.GX3644@twins.programming.kicks-ass.net> <20150908100551.GC3644@twins.programming.kicks-ass.net> Date: Tue, 8 Sep 2015 10:45:06 -0700 X-Google-Sender-Auth: IVR4U55SrDTO2fZvdvPqK7iQmj8 Message-ID: Subject: Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression From: Linus Torvalds To: Peter Zijlstra Cc: Davidlohr Bueso , Dave Chinner , Linux Kernel Mailing List , Waiman Long , Ingo Molnar Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 8, 2015 at 3:05 AM, Peter Zijlstra wrote: > > Ah, so I think the confusion is in what we consider paravirt to mean. My > definition of paravirt is that its a form of virtualization where the > guest and host communicate over a software channel. Like an architected bit in cpuid that the host sets if it wants the guest to change its behavior? Linus