Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753165AbaB0MfN (ORCPT ); Thu, 27 Feb 2014 07:35:13 -0500 Received: from mail-ee0-f42.google.com ([74.125.83.42]:58432 "EHLO mail-ee0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752704AbaB0MfL (ORCPT ); Thu, 27 Feb 2014 07:35:11 -0500 Date: Thu, 27 Feb 2014 13:35:07 +0100 From: Ingo Molnar To: Andy Lutomirski Cc: Andi Kleen , Stephane Eranian , "Yan, Zheng" , LKML , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support Message-ID: <20140227123507.GB11475@gmail.com> References: <1392703661-15104-1-git-send-email-zheng.z.yan@intel.com> <530D53EF.9090706@amacapital.net> <20140226185513.GL22728@two.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Andy Lutomirski wrote: > On Wed, Feb 26, 2014 at 10:55 AM, Andi Kleen wrote: > > >> I'm suggesting a perf event option, just like the way that PEBS > >> works. > > > > Right now it's a somewhat experimental feature and just having the > > sysctl is fine. [...] NACKed-by: Ingo Molnar > > [...] If it turns out that is what everyone uses such an option > > could be still added later. > > I'm a bit worried that the syscall will be stuck as ABI forever, > though. Its presence will make adding a different configuration > mechanism awkward. The sysctl is a usability non-starter, obviously. Thanks, Ingo -- 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/