Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756552AbdCGX3b (ORCPT ); Tue, 7 Mar 2017 18:29:31 -0500 Received: from mail-it0-f46.google.com ([209.85.214.46]:38228 "EHLO mail-it0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756507AbdCGX32 (ORCPT ); Tue, 7 Mar 2017 18:29:28 -0500 MIME-Version: 1.0 In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F6120F0A9@ORSMSX113.amr.corp.intel.com> References: <1488908964-30261-1-git-send-email-vikas.shivappa@linux.intel.com> <3908561D78D1C84285E8C5FCA982C28F6120F0A9@ORSMSX113.amr.corp.intel.com> From: Stephane Eranian Date: Tue, 7 Mar 2017 15:29:03 -0800 Message-ID: Subject: Re: [PATCH 1/1] x86/cqm: Cqm requirements To: "Luck, Tony" Cc: Thomas Gleixner , Vikas Shivappa , "Shivappa, Vikas" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "hpa@zytor.com" , "mingo@kernel.org" , "peterz@infradead.org" , "Shankar, Ravi V" , "Yu, Fenghua" , "Kleen, Andi" , "davidcc@google.com" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 863 Lines: 24 Hi, On Tue, Mar 7, 2017 at 12:04 PM, Luck, Tony wrote: >> That's all nice and good, but I still have no coherent explanation why >> measuring across allocation domains makes sense. > > Is this in reaction to this one? > >>> 5) Put multiple threads into a single measurement group > > If we fix it to say "threads from the same CAT group" does it fix things? > Inside a CAT partition, there may be multiple tasks split into different cgroups. We need the ability to monitor groups of tasks individually within that CAT partition. I think this is what this bullet is about. > We'd like to have measurement groups use a single RMID ... if we > allowed tasks from different CAT groups in the same measurement > group we wouldn't be able to split the numbers back to report the > right overall total for each of the CAT groups. > > -Tony