From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756546Ab2J2KIJ (ORCPT ); Mon, 29 Oct 2012 06:08:09 -0400 Received: from LGEMRELSE6Q.lge.com ([156.147.1.121]:42732 "EHLO LGEMRELSE6Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752097Ab2J2KIH (ORCPT ); Mon, 29 Oct 2012 06:08:07 -0400 X-AuditID: 9c930179-b7c8bae000003559-71-508e55843d59 From: Namhyung Kim To: Andi Kleen Cc: linux-kernel@vger.kernel.org, acme@redhat.com, peterz@infradead.org, jolsa@redhat.com, eranian@google.com, mingo@kernel.org, Andi Kleen Subject: Re: [PATCH 01/33] perf, x86: Add PEBSv2 record support References: <1351283415-13170-1-git-send-email-andi@firstfloor.org> <1351283415-13170-2-git-send-email-andi@firstfloor.org> Date: Mon, 29 Oct 2012 19:08:04 +0900 In-Reply-To: <1351283415-13170-2-git-send-email-andi@firstfloor.org> (Andi Kleen's message of "Fri, 26 Oct 2012 13:29:43 -0700") Message-ID: <874nld8ubf.fsf@sejong.aot.lge.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andi, On Fri, 26 Oct 2012 13:29:43 -0700, Andi Kleen wrote: > From: Andi Kleen > > Add support for the v2 PEBS format. It has a superset of the v1 PEBS > fields, but has a longer record so we need to adjust the code paths. > > The main advantage is the new "EventingRip" support which directly > gives the instruction, not off-by-one instruction. So with precise == 2 > we use that directly and don't try to use LBRs and walking basic blocks. > This lowers the overhead significantly. That means it can support precise == 3? Thanks, Namhyung