Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754771AbYJOQcA (ORCPT ); Wed, 15 Oct 2008 12:32:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751885AbYJOQbw (ORCPT ); Wed, 15 Oct 2008 12:31:52 -0400 Received: from mga01.intel.com ([192.55.52.88]:23723 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751757AbYJOQbw (ORCPT ); Wed, 15 Oct 2008 12:31:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.33,417,1220252400"; d="scan'208";a="627516921" Date: Wed, 15 Oct 2008 18:29:02 +0200 From: Markus Metzger To: linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, rdreier@cisco.com Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com Subject: [rfc] x86, bts: improve X86_PTRACE_BTS help text Message-ID: <20081015182902.A30726@sedona.ch.intel.com> Mime-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.2.5i Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2440 Lines: 62 Improve the help text on the BTS config option. Remove the DS config option - set it implicitly, when BTS is selected. Signed-off-by: markus.t.metzger@intel.com ---- Index: gits/arch/x86/Kconfig.cpu =================================================================== --- gits.orig/arch/x86/Kconfig.cpu 2008-10-15 09:02:47.000000000 +0200 +++ gits/arch/x86/Kconfig.cpu 2008-10-15 12:59:21.000000000 +0200 @@ -513,19 +513,19 @@ If unsure, say N. config X86_DS - bool "Debug Store support" - default y - help - Add support for Debug Store. - This allows the kernel to provide a memory buffer to the hardware - to store various profiling and tracing events. + def_bool X86_PTRACE_BTS + depends on X86_DEBUGCTLMSR config X86_PTRACE_BTS - bool "ptrace interface to Branch Trace Store" + bool "Branch Trace Store" default y - depends on (X86_DS && X86_DEBUGCTLMSR) + depends on X86_DEBUGCTLMSR help - Add a ptrace interface to allow collecting an execution trace - of the traced task. - This collects control flow changes in a (cyclic) buffer and allows - debuggers to fill in the gaps and show an execution trace of the debuggee. + This adds a ptrace interface to the hardware's branch trace store. + + Debuggers may use it to collect an execution trace of the debugged + application in order to answer the question 'how did I get here?'. + Debuggers may trace user mode as well as kernel mode. + + Say Y unless there is no application development on this machine + and you want to save a small amount of code size. --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- 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/