Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754198AbZGWNGu (ORCPT ); Thu, 23 Jul 2009 09:06:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751844AbZGWNGu (ORCPT ); Thu, 23 Jul 2009 09:06:50 -0400 Received: from viefep12-int.chello.at ([62.179.121.32]:60895 "EHLO viefep12-int.chello.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754004AbZGWNGt (ORCPT ); Thu, 23 Jul 2009 09:06:49 -0400 X-SourceIP: 213.93.53.227 Subject: Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints From: Peter Zijlstra To: Frederic Weisbecker Cc: Ingo Molnar , LKML , Steven Rostedt , Thomas Gleixner , Mike Galbraith , Paul Mackerras , Arnaldo Carvalho de Melo , Lai Jiangshan , Anton Blanchard , Li Zefan , Zhaolei , KOSAKI Motohiro , Mathieu Desnoyers , "K . Prasad" , Alan Stern In-Reply-To: <1248109687-7808-6-git-send-email-fweisbec@gmail.com> References: <1248109687-7808-1-git-send-email-fweisbec@gmail.com> <1248109687-7808-6-git-send-email-fweisbec@gmail.com> Content-Type: text/plain Date: Thu, 23 Jul 2009 15:08:13 +0200 Message-Id: <1248354493.26273.2.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 818 Lines: 16 On Mon, 2009-07-20 at 13:08 -0400, Frederic Weisbecker wrote: > This adds the support for kernel hardware breakpoints in perfcounter. > It is added as a new type of software counter and can be defined by > using the counter number 5 and by passsing the address of the > breakpoint to set through the config attribute. Is there a limit to these hardware breakpoints? If so, the software counter model is not sufficient, since we assume we can always schedule all software counters. However if you were to add more counters than you have hardware breakpoints you're hosed. -- 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/