From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753710AbYJNSTj (ORCPT ); Tue, 14 Oct 2008 14:19:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751395AbYJNSTb (ORCPT ); Tue, 14 Oct 2008 14:19:31 -0400 Received: from sj-iport-1.cisco.com ([171.71.176.70]:42026 "EHLO sj-iport-1.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751348AbYJNSTa (ORCPT ); Tue, 14 Oct 2008 14:19:30 -0400 X-IronPort-AV: E=Sophos;i="4.33,410,1220227200"; d="scan'208";a="90823327" From: Roland Dreier To: linux-kernel@vger.kernel.org, Markus Metzger Cc: Ingo Molnar Subject: X86_DS config option needs better help text X-Message-Flag: Warning: May contain useful information Date: Tue, 14 Oct 2008 11:19:28 -0700 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 14 Oct 2008 18:19:29.0330 (UTC) FILETIME=[65CDE920:01C92E29] Authentication-Results: sj-dkim-2; header.From=rdreier@cisco.com; dkim=pass ( sig from cisco.com/sjdkim2002 verified; ); Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Noticed while building a new kernel from latest git: Debug Store support (X86_DS) [Y/n/?] (NEW) ? and asking for help just gives Add support for Debug Store. This allows the kernel to provide a memory buffer to the hardware to store various profiling and tracing events. This doesn't really let me decide if I want it or not. Is there a cost to enabling this, and if so what? What new feature does this give me? Is there even a point to making this a user-visible option at all, or should it just be an internal config variable selected by X86_PTRACE_BTS and any future users of this? X86_PTRACE_BTS also could use an improved help text. No patch, sorry, since I don't actually know for sure what this does. Thanks, Roland