Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753214AbbBKQZK (ORCPT ); Wed, 11 Feb 2015 11:25:10 -0500 Received: from mail-ie0-f181.google.com ([209.85.223.181]:39288 "EHLO mail-ie0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752015AbbBKQZI (ORCPT ); Wed, 11 Feb 2015 11:25:08 -0500 Message-ID: <54DB8262.1090705@gmail.com> Date: Wed, 11 Feb 2015 09:25:06 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Peter Zijlstra , Stephane Eranian CC: LKML , Arnaldo Carvalho de Melo , "mingo@elte.hu" , "ak@linux.intel.com" , Jiri Olsa , Namhyung Kim , Rose Belcher , Sukadev Bhattiprolu , Sonny Rao , John Mccutchan Subject: Re: [PATCH 0/4] perf: add support for profiling jitted code References: <1423611765-18200-1-git-send-email-eranian@google.com> <20150211113946.GT23123@twins.programming.kicks-ass.net> <20150211161516.GI2896@worktop.programming.kicks-ass.net> In-Reply-To: <20150211161516.GI2896@worktop.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1239 Lines: 31 On 2/11/15 9:15 AM, Peter Zijlstra wrote: > On Wed, Feb 11, 2015 at 08:18:37AM -0500, Stephane Eranian wrote: > >> But, we need a portable solution, there are jitted environment on other >> architectures. > > Yeah, I'm aware of that. But the time people are not liking any of those > patches. > > The thing that seems to have most traction is something like > > lkml.kernel.org/r/20150211161256.GH2896@worktop.programming.kicks-ass.net > > Which would basically make the trace clock be CLOCK_MONOTONIC. > Sure, but IF that solution is ever adopted it will apply to top of tree kernels. In the meantime users of long term kernels (enterprise, LTS, other) need to be able to use this feature. I understand that Ingo (and probably you as well) have a disdain for the kernel module approach mentioned above and it is not the preferred approach. But given the resistance for over *4 years* to solutions to this problem the module does provide a solution for the existing user base. David -- 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/