Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751421AbbFYUl1 (ORCPT ); Thu, 25 Jun 2015 16:41:27 -0400 Received: from mail-wg0-f52.google.com ([74.125.82.52]:34508 "EHLO mail-wg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751272AbbFYUlS (ORCPT ); Thu, 25 Jun 2015 16:41:18 -0400 MIME-Version: 1.0 In-Reply-To: <1434831679-3852-1-git-send-email-tal.shorer@gmail.com> References: <1434831679-3852-1-git-send-email-tal.shorer@gmail.com> Date: Thu, 25 Jun 2015 23:41:17 +0300 Message-ID: Subject: Re: [Patch RFC 0/2] tracing: allow disabling compilation of specific trace systems From: Tal Shorer To: rostedt@goodmis.org, mingo@redhat.com Cc: "" , Tal Shorer Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1525 Lines: 38 ping? On Sat, Jun 20, 2015 at 11:21 PM, Tal Shorer wrote: > Currently, enabling CONFIG_TRACING on a system comes as all-or-nothing: either > tracepoints for all subsystems are compiled (with CONFIG_TRACING) or none of > them do (without it). > > This caused me an unacceptable performance penalty (obviously SOME penalty was > expected, but not one so severe) which made me revert the changes in > configuration. > > The first patch in this series modifies the files that actually define the > tracepoint to look for a preprocessor macro NOTRACE and define nops (as if > CONFIG_TRACING was not set) instead of them. > > The second patch provides an example of how I see this working, with the gpio > subsystem as the example for absolutely no reason. > If this idea is deemed worth the time by the community, I'll create patches for > the other subsystems. > > Tal Shorer (2): > tracing: allow disabling compilation of specific trace systems > tracing: gpio: add Kconfig option for enabling/disabling trace events > > drivers/gpio/Kconfig | 6 ++++++ > include/linux/tracepoint.h | 6 +++--- > include/trace/define_trace.h | 2 +- > include/trace/events/gpio.h | 4 ++++ > 4 files changed, 14 insertions(+), 4 deletions(-) > > -- > 2.2.2 > -- 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/