From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751595Ab0CKUqQ (ORCPT ); Thu, 11 Mar 2010 15:46:16 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:55454 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751122Ab0CKUqP (ORCPT ); Thu, 11 Mar 2010 15:46:15 -0500 Message-ID: <4B99568D.30608@linux.vnet.ibm.com> Date: Thu, 11 Mar 2010 12:46:05 -0800 From: Corey Ashford User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Ingo Molnar CC: LKML , Peter Zijlstra , Frederic Weisbecker , Steven Rostedt Subject: Re: [RFC] [PATCH 1/1] perf: add support for arch-dependent symbolic event names to "perf stat" References: <4B8F1B58.5000702@linux.vnet.ibm.com> <4B8FFE55.5070008@linux.vnet.ibm.com> <20100311124608.GG31354@elte.hu> <4B993AAF.9050507@linux.vnet.ibm.com> <20100311191441.GA7593@elte.hu> In-Reply-To: <20100311191441.GA7593@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/11/2010 11:14 AM, Ingo Molnar wrote: > > * Corey Ashford wrote: [snip] >> I'm not sure how that would work. The issue I am trying to solve >> here is that Power arch chips have a large number of very >> hardware-specific events that are not generalizable. Many of these >> events not only have names, but other user-configurable bits as well >> that select or narrow the scope of which exact events are recorded. >> This issue is dealt with nicely in libpfm4, as it has mechanisms for >> parsing event names and attributes (aka modifiers or unit masks), >> and then produces a usable config field for the perf_events_attr >> struct. >> >> Should I take it from the above that you are completely against the >> idea of using an external library for hardware-specific event and >> attribute naming? > > Could you give a few relevant examples of events in question, and the kind of > configurability/attributes they have on Power? Here are a few examples for the Power A2 processor. I've distorted the names because PMU architecture isn't publicly released yet. PM_DE_PMC_9:hrd_mask=0xff:hrd=0x22:pma_mask=0x3fff:pma=0x1b2d:culling_mode=3 PM_EX_0x03:lane=2:vlane=1 PM_OWE_ENG_MAC_FULL:usu=3 Note that the attribute fields shown above are fitted into the config field of the perf_event_attr struct. > > Thanks, > > Ingo Regards, - Corey