From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756456AbbLHN2G (ORCPT ); Tue, 8 Dec 2015 08:28:06 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:41053 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756331AbbLHN2E (ORCPT ); Tue, 8 Dec 2015 08:28:04 -0500 Date: Tue, 8 Dec 2015 14:27:53 +0100 From: Peter Zijlstra To: Ingo Molnar Cc: vincent.weaver@maine.edu, jolsa@redhat.com, torvalds@linux-foundation.org, eranian@google.com, tglx@linutronix.de, acme@redhat.com, ak@linux.intel.com, linux-kernel@vger.kernel.org, hpa@zytor.com, linux-tip-commits@vger.kernel.org Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp Message-ID: <20151208132753.GD6373@twins.programming.kicks-ass.net> References: <1448929689-13771-2-git-send-email-andi@firstfloor.org> <20151206131102.GA12167@gmail.com> <20151207135107.GA6356@twins.programming.kicks-ass.net> <20151208053604.GA15632@gmail.com> <20151208085026.GF6356@twins.programming.kicks-ass.net> <20151208085707.GC6373@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151208085707.GC6373@twins.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 08, 2015 at 09:57:07AM +0100, Peter Zijlstra wrote: > On Tue, Dec 08, 2015 at 09:50:26AM +0100, Peter Zijlstra wrote: > > On Tue, Dec 08, 2015 at 06:36:04AM +0100, Ingo Molnar wrote: > > > > > So I checked my NHM box with your latest queue and it now works correctly. Do you > > > have any idea what the difference is/was? > > > > Sadly, no clue :/ > > > > I went over those patches and cannot find anything that should affect > > NHM (or <=SNB in fact). > > Oh wait, I spoke too soon, the two new patches affect everything with > PEBS. And esp. the latter one: > > lkml.kernel.org/r/1449177740-5422-2-git-send-email-andi@firstfloor.org > If that is the patch that makes your NHM go again, then running 2 concurrent perf-top sessions should make it all go dark again.