From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759748AbYD3QAL (ORCPT ); Wed, 30 Apr 2008 12:00:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756514AbYD3P7y (ORCPT ); Wed, 30 Apr 2008 11:59:54 -0400 Received: from one.firstfloor.org ([213.235.205.2]:53733 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756005AbYD3P7y (ORCPT ); Wed, 30 Apr 2008 11:59:54 -0400 Date: Wed, 30 Apr 2008 18:06:11 +0200 From: Andi Kleen To: "Metzger, Markus T" Cc: Andi Kleen , andi-suse@firstfloor.org, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, markus.t.metzger@gmail.com, "Siddha, Suresh B" , roland@redhat.com, akpm@linux-foundation.org, mtk.manpages@gmail.com, eranian@googlemail.com, "Villacis, Juan" Subject: Re: [patch] x86, ptrace: in-kernel BTS interface Message-ID: <20080430160611.GD20451@one.firstfloor.org> References: <20080430135440.A359@sedona.ch.intel.com> <20080430130305.GC20451@one.firstfloor.org> <029E5BE7F699594398CA44E3DDF5544401CE236A@swsmsx413.ger.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <029E5BE7F699594398CA44E3DDF5544401CE236A@swsmsx413.ger.corp.intel.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > >I'm not quite sure on the kernel interface. How would a in kernel > >subsystem use it for tracing itself for example? > > The task parameter would be current. > > Apart from that, you would use it the same way it is used in > arch/x86/kernel/ptrace.c. Hmm, sounds a little too complicated. Surely that could be easier? > > You would want to bts_configure() it to disable tracing before you start > reading your own BTS buffer. I would suggest to write a simple example and put it with some overview into Documentation -Andi