From nobody Sat Feb 7 21:05:00 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A023C4321E for ; Thu, 24 Nov 2022 14:51:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229937AbiKXOva (ORCPT ); Thu, 24 Nov 2022 09:51:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229829AbiKXOvA (ORCPT ); Thu, 24 Nov 2022 09:51:00 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 065BA134128 for ; Thu, 24 Nov 2022 06:50:50 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B7905B82847 for ; Thu, 24 Nov 2022 14:50:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 706E4C4347C; Thu, 24 Nov 2022 14:50:47 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.96) (envelope-from ) id 1oyDYs-001X5U-1n; Thu, 24 Nov 2022 09:50:46 -0500 Message-ID: <20221124145046.434583980@goodmis.org> User-Agent: quilt/0.66 Date: Thu, 24 Nov 2022 09:50:26 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Andrew Morton , Daniel Bristot de Oliveira , Jonathan Corbet Subject: [for-next][PATCH 07/11] Documentation/osnoise: Add osnoise/options documentation References: <20221124145019.782980678@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Daniel Bristot de Oliveira Add the documentation about the osnoise/options file, along with an explanation about the OSNOISE_WORKLOAD option. Link: https://lkml.kernel.org/r/777af8f3d87beedd304805f98eff6c8291d64226.16= 68692096.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Masami Hiramatsu Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google) --- Documentation/trace/osnoise-tracer.rst | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/trace/osnoise-tracer.rst b/Documentation/trace/o= snoise-tracer.rst index 963def9f97c6..3c675ed82b27 100644 --- a/Documentation/trace/osnoise-tracer.rst +++ b/Documentation/trace/osnoise-tracer.rst @@ -109,6 +109,11 @@ The tracer has a set of options inside the osnoise dir= ectory, they are: - tracing_threshold: the minimum delta between two time() reads to be considered as noise, in us. When set to 0, the default value will be used, which is currently 5 us. + - osnoise/options: a set of on/off options that can be enabled by + writing the option name to the file or disabled by writing the option + name preceded with the 'NO_' prefix. For example, writing + NO_OSNOISE_WORKLOAD disables the OSNOISE_WORKLOAD option. The + special DEAFAULTS option resets all options to the default value. =20 Additional Tracing ------------------ @@ -150,3 +155,10 @@ tracepoints is smaller than eight us reported in the s= ample_threshold. The reason roots in the overhead of the entry and exit code that happens before and after any interference execution. This justifies the dual approach: measuring thread and tracing. + +Running osnoise tracer without workload +--------------------------------------- + +By enabling the osnoise tracer with the NO_OSNOISE_WORKLOAD option set, +the osnoise: tracepoints serve to measure the execution time of +any type of Linux task, free from the interference of other tasks. --=20 2.35.1