From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757636Ab3DHHY1 (ORCPT ); Mon, 8 Apr 2013 03:24:27 -0400 Received: from ozlabs.org ([203.10.76.45]:33361 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934440Ab3DHHYZ (ORCPT ); Mon, 8 Apr 2013 03:24:25 -0400 Date: Mon, 8 Apr 2013 17:24:22 +1000 From: Michael Ellerman To: acme@infradead.org Cc: peterz@infradead.org, jolsa@redhat.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, rob@landley.net Subject: Re: [RFC/PATCH] perf: Expand definition of sysfs format attribute Message-ID: <20130408072422.GA4476@concordia> References: <1362370865-4437-1-git-send-email-michael@ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1362370865-4437-1-git-send-email-michael@ellerman.id.au> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 04, 2013 at 03:21:05PM +1100, Michael Ellerman wrote: > Make it explicit that the format attributes may define overlapping bit > ranges. Unfortunately this was left unspecified originally, and all the > examples show non-overlapping ranges. I don't believe this is an ABI > change, as we are defining something that was previously undefined, but > others may disagree. > > The POWER8 PMU would like to define overlapping ranges, as bit ranges in > the event code have different meanings for certain events. It will also > allow us to define an overarching "event" field, that encompasses all > others. > > As far as I can see perf is comfortable with this change, however I am > not sure if there are any other users of the interface. Any comments on this one? cheers