From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753413Ab1LFTVP (ORCPT ); Tue, 6 Dec 2011 14:21:15 -0500 Received: from casper.infradead.org ([85.118.1.10]:56099 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751866Ab1LFTVO convert rfc822-to-8bit (ORCPT ); Tue, 6 Dec 2011 14:21:14 -0500 Message-ID: <1323199215.32012.87.camel@twins> Subject: Re: [PATCH 00/12] perf_events: add support for sampling taken branches (v2) From: Peter Zijlstra To: Stephane Eranian Cc: Will Deacon , "linux-kernel@vger.kernel.org" , "mingo@elte.hu" , "acme@redhat.com" , "ming.m.lin@intel.com" , "andi@firstfloor.org" , "robert.richter@amd.com" , "ravitillo@lbl.gov" , "paulus@samba.org" , "benh@kernel.crashing.org" , "rth@twiddle.net" , "ralf@linux-mips.org" , "davem@davemloft.net" , "lethal@linux-sh.org" Date: Tue, 06 Dec 2011 20:20:15 +0100 In-Reply-To: References: <1318595833-29984-1-git-send-email-eranian@google.com> <1323124766.32012.49.camel@twins> <20111206094927.GA25782@mudshark.cambridge.arm.com> <1323169412.32012.69.camel@twins> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.2.1- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2011-12-06 at 11:14 -0800, Stephane Eranian wrote: > >> > Other than the few comments given it all looks good. My main worry is > >> > the Intel only aspect, I'd really love for there to be another platform > >> > that could implement at least part of this. > There is a hardware branch buffer on all Itanium processors. > You can find the description for the McKinley implementation > (Itanium2) branch buffer in section 10.3.9 from: > http://download.intel.com/design/Itanium2/manuals/25111003.pdf Yeah, I knew Itanic has it, but one its sinking (and doesn't have perf support), and two its still Intel ;-)