From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755573AbaCNINz (ORCPT ); Fri, 14 Mar 2014 04:13:55 -0400 Received: from merlin.infradead.org ([205.233.59.134]:34916 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755373AbaCNINw (ORCPT ); Fri, 14 Mar 2014 04:13:52 -0400 Date: Fri, 14 Mar 2014 09:13:38 +0100 From: Peter Zijlstra To: Andi Kleen Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, eranian@google.com, acme@redhat.com, namhyung@kernel.org, jolsa@redhat.com, Andi Kleen Subject: Re: [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS events Message-ID: <20140314081338.GL27965@twins.programming.kicks-ass.net> References: <1394745733-27855-1-git-send-email-andi@firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1394745733-27855-1-git-send-email-andi@firstfloor.org> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 13, 2014 at 02:22:12PM -0700, Andi Kleen wrote: > From: Andi Kleen > > The SDM forbids setting various event qualifiers with PEBS > events. The magic cycles:pp event uses it, but it has caused > problems in the past. We continue allowing it for cycles:pp, > but forbid it for all other events to follow the SDM. Last time this came up I asked for what kind of problems it caused. No answer then I think, and certainly no answer now.