From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753142Ab0ARPAP (ORCPT ); Mon, 18 Jan 2010 10:00:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751632Ab0ARPAO (ORCPT ); Mon, 18 Jan 2010 10:00:14 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:42211 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751547Ab0ARPAN (ORCPT ); Mon, 18 Jan 2010 10:00:13 -0500 Subject: Re: [PATCH] perf_events: improve x86 event scheduling (v5) From: Peter Zijlstra To: Frederic Weisbecker Cc: Stephane Eranian , linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org, davem@davemloft.net, perfmon2-devel@lists.sf.net, eranian@gmail.com In-Reply-To: <20100118145346.GF10364@nowhere> References: <4b5430c6.0f975e0a.1bf9.ffff85fe@mx.google.com> <20100118134324.GB10364@nowhere> <1263822898.4283.558.camel@laptop> <20100118142004.GD10364@nowhere> <1263825421.4283.597.camel@laptop> <20100118145346.GF10364@nowhere> Content-Type: text/plain; charset="UTF-8" Date: Mon, 18 Jan 2010 15:59:58 +0100 Message-ID: <1263826798.4283.606.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2010-01-18 at 15:53 +0100, Frederic Weisbecker wrote: > Not sure what you both mean by this core VS uncore thing :) > Is it about hardware counters that apply to single hardware threads > or shared among them inside a same core? Yeah intel has two PMUs, one per logical cpu and one per socket/node. We currently don't support the node one yet. So the thing with these socket wide things is is that they are not able to tell where the event originated, so relating that back to a task is only possible when there's only one task running.