Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933278AbWKWIw7 (ORCPT ); Thu, 23 Nov 2006 03:52:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933284AbWKWIw7 (ORCPT ); Thu, 23 Nov 2006 03:52:59 -0500 Received: from cantor.suse.de ([195.135.220.2]:21646 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S933278AbWKWIw6 (ORCPT ); Thu, 23 Nov 2006 03:52:58 -0500 Date: Thu, 23 Nov 2006 09:52:54 +0100 From: Andi Kleen To: Keith Owens Cc: Andi Kleen , Jeremy Fitzhardinge , eranian@hpl.hp.com, linux-kernel@vger.kernel.org, akpm@osdl.org Subject: Re: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection Message-ID: <20061123085254.GA29738@bingen.suse.de> References: <200611180924.01979.ak@suse.de> <6428.1164261827@kao2.melbourne.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6428.1164261827@kao2.melbourne.sgi.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 488 Lines: 12 > LBR is mainly useful on wild branches to random addresses. As such, The page fault handler is one of the most performance critical exceptions. And then on x86-64 a lot of stray pointers actually result in a #GP, not a page fault. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/