Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753314Ab1DEJJ3 (ORCPT ); Tue, 5 Apr 2011 05:09:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:23667 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752700Ab1DEJJ1 (ORCPT ); Tue, 5 Apr 2011 05:09:27 -0400 Message-ID: <4D9ADC1D.5010109@redhat.com> Date: Tue, 05 Apr 2011 12:08:45 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Lightning/1.0b3pre Thunderbird/3.1.9 MIME-Version: 1.0 To: Peter Zijlstra CC: ben@iagu.net, Eric Dumazet , Thomas Gleixner , KVM list , linux-kernel , John Stultz , Richard Cochran , Mike Galbraith Subject: Re: [PATCH] posix-timers: RCU conversion References: <20110318123031.GB6066@8bytes.org> <4D871F6C.40207@redhat.com> <4D875842.9050308@redhat.com> <4D8773AA.8030408@redhat.com> <1300726498.2884.493.camel@edumazet-laptop> <4D8784A9.8040303@redhat.com> <1300727545.2884.513.camel@edumazet-laptop> <1300746429.2837.20.camel@edumazet-laptop> <1300777760.2837.38.camel@edumazet-laptop> <4D887B6A.2020102@redhat.com> <1301993300.2225.26.camel@twins> <4D9AD92D.401@redhat.com> <1301994229.2225.30.camel@twins> In-Reply-To: <1301994229.2225.30.camel@twins> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 996 Lines: 27 On 04/05/2011 12:03 PM, Peter Zijlstra wrote: > On Tue, 2011-04-05 at 11:56 +0300, Avi Kivity wrote: > > > > Could be waking up due to guest wakeups, or qemu internal wakeups > > (display refresh) or due to guest timer sources which are masked away in > > the guest (if that's the case we should optimize it away). > > Right, so I guess we're all clutching at straws here :-) > > Ben how usable is that system when its in that state? Could you run a > function trace or a trace with all kvm and sched trace-events enabled? Ben, to do that, look up http://www.linux-kvm.org/page/Tracing; the command for combined sched/kvm tracing is # trace-cmd record -b 20000 -e kvm -e sched -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/