From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH v2 00/11] KVM in-guest performance monitoring Date: Wed, 15 Jun 2011 16:22:00 +0300 Message-ID: <4DF8B1F8.6030502@redhat.com> References: <1307972106-2468-1-git-send-email-avi@redhat.com> <4DF66B1A.6060606@cisco.com> <4DF71DA3.2080300@redhat.com> <4DF7972F.3040103@cisco.com> <4DF79941.9050705@siemens.com> <4DF79B6F.10102@cisco.com> <4DF79EFE.1050201@cisco.com> <4DF7A436.8090308@cisco.com> <4DF873FD.6040903@redhat.com> <4DF8A82F.5090900@cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , kvm@vger.kernel.org, Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo To: David Ahern Return-path: Received: from mx1.redhat.com ([209.132.183.28]:58915 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753337Ab1FONWO (ORCPT ); Wed, 15 Jun 2011 09:22:14 -0400 In-Reply-To: <4DF8A82F.5090900@cisco.com> Sender: kvm-owner@vger.kernel.org List-ID: On 06/15/2011 03:40 PM, David Ahern wrote: > On 06/15/2011 02:57 AM, Avi Kivity wrote: > > Okay. If you do anything interesting with it, please let us know. I > > only tested the watchdog, 'perf top', and 'perf stat'. > > > > For the following I was using the userspace command from latest > perf-core branch. > > cycles H/W event is not working for me, so perf-top did not do much > other than start. Strange, IIRC it did for me. I'll re-test. > perf-stat -ddd shows a whole lot of 0's - which is interesting. It means > time enabled and time running are non-0, yet the counter value is 0. > cycles and instructions events also show as not counted Most of those counters aren't supported by the emulated PMU. What does dmesg say about Perf? > Also, the numbers for branches and branch-misses just seem wrong > compared to the same command run in the host as well as running > perf-stat in the host on the vcpu thread running openssl (with the vcpu > pinned to a pcpu). Could be due to the fact that the counter is running in host mode. Will be fixed once the exclude_host/exclude_guest patch makes it in (and gains Intel support). -- error compiling committee.c: too many arguments to function