From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: Question about Perf's handling of in-use performance counters Date: Fri, 28 Oct 2016 09:33:05 -0700 Message-ID: <20161028163305.GD26852@two.firstfloor.org> References: <87r371k6gj.fsf@tassilo.jf.intel.com> <20161027210012.GN3102@twins.programming.kicks-ass.net> <20161028135325.GB26852@two.firstfloor.org> <20161028140354.GH3142@twins.programming.kicks-ass.net> <20161028154012.GC26852@two.firstfloor.org> <20161028162844.GJ3142@twins.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from one.firstfloor.org ([193.170.194.197]:56109 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965925AbcJ1QdI (ORCPT ); Fri, 28 Oct 2016 12:33:08 -0400 Content-Disposition: inline In-Reply-To: <20161028162844.GJ3142@twins.programming.kicks-ass.net> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Peter Zijlstra Cc: Andi Kleen , Taylor Andrews , "linux-perf-users@vger.kernel.org" > But the thing is still racy, and therefore useless. At least the Hypervisor case is not racy. The Hypervisor always uses that counter. -Andi