From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754142AbaCCRXS (ORCPT ); Mon, 3 Mar 2014 12:23:18 -0500 Received: from one.firstfloor.org ([193.170.194.197]:53290 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752844AbaCCRXR (ORCPT ); Mon, 3 Mar 2014 12:23:17 -0500 Date: Mon, 3 Mar 2014 18:23:16 +0100 From: Andi Kleen To: Don Zickus Cc: Davidlohr Bueso , Andi Kleen , acme@ghostprotocols.net, LKML , jolsa@redhat.com, jmario@redhat.com, fowles@inreach.com, eranian@google.com, Arnaldo Carvalho de Melo , David Ahern , Frederic Weisbecker , Mike Galbraith , Paul Mackerras , Peter Zijlstra , Richard Fowles Subject: Re: [PATCH 08/19] perf c2c: Shared data analyser Message-ID: <20140303172316.GA22728@two.firstfloor.org> References: <1393609388-40489-1-git-send-email-dzickus@redhat.com> <1393609388-40489-9-git-send-email-dzickus@redhat.com> <87lhwvawc4.fsf@tassilo.jf.intel.com> <20140228194642.GM25953@redhat.com> <1393621411.2899.39.camel@buesod1.americas.hpqcorp.net> <20140303150531.GZ25953@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140303150531.GZ25953@redhat.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Hmm, so based on Andi's reply, I am assuming you are running on a Westmere > (or Nehalem) due to the lack of mem-stores. > > If you don't have mem-stores, this tool isn't going to work. The tool can > only detect contention when sampling reads _and_ writes to the same > addresses. On these CPUs you could simply sample on HITM. You won't get addresses, but at least IPs and call stacks. -Andi