From patchwork Tue May 23 17:22:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Bristot de Oliveira X-Patchwork-Id: 13252709 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 1DB67C7EE26 for ; Tue, 23 May 2023 17:24:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238115AbjEWRYF (ORCPT ); Tue, 23 May 2023 13:24:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238126AbjEWRXy (ORCPT ); Tue, 23 May 2023 13:23:54 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 607D8E71; Tue, 23 May 2023 10:23:30 -0700 (PDT) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 068656350A; Tue, 23 May 2023 17:22:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5083BC433EF; Tue, 23 May 2023 17:22:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684862575; bh=59Ee5xutk7/Hb+vfpH0Y/w5tXaQRPpZBjU1DCAPBef8=; h=From:To:Cc:Subject:Date:From; b=epnwLyy642Hn98YdXyGh07p3yiu6hiz99gJAfoPGe5zn3DsFsLs7sfUgVU7yONuwp /nzVg1ewMBKzWit535YK9fvmMaq2qhxtDIYwqMKjhnSSbTOS6ccsxblPCOMCC2f51e ZDtIDHAkM3VVTvMRyyr4kKAHOIk2h3gnTMKq2fT6LcYRzEnYqyGvXPUW/i1TWmxBxm ivvk5COkUHenMGdUJq2ji7jlhNKzzAEjo/iLs/5G1jlmzx0NJ1MtsRtuELRB9Gei+y aWg9fdp4zm8rhSdBx9IjGBuQ33Pfl5DPyCebNOAAXXpmObmAyy3F8FX1dSZZqdosL/ NQcqd2H2aClzg== From: Daniel Bristot de Oliveira To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt Cc: Juri Lelli , William White , Daniel Bristot de Oliveira , Masami Hiramatsu , Jonathan Corbet Subject: [PATCH V2 0/3] osnoise/timerlat improvements Date: Tue, 23 May 2023 19:22:45 +0200 Message-Id: X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org These three patches are improvements for the osnoise/timerlat tracers, mainly to support rtla. The first one is a dependency for the -C command line option to be added to rtla. It is essential to allow timerlat/osnoise to measure the latencies from the container/cgroup point of view. The second improves rtla time for saving tracing after a stop tracing condition on osnoise/hwnoise. The third patch adds the osnoise/per_cpu/cpu$id/timerlat_fd file where timerlat expects a pinned user thread to open and read from it. When the thread reads it, it actually activates timerlat latency measurement mechanism, so timerlat can be activated from an user-space thread. Timerlat is also expanded to report the return from user-space latency when read is called after the first call, so adding another metric to timerlat, that can either represent the kernel-to-user and user-to-kernel overhead, or to measure the execution time of any workload. Details are added to the kernel documentation. Changes from V1: - Added the user-space interface patch - Link: https://lore.kernel.org/lkml/cover.1683823114.git.bristot@kernel.org/ Daniel Bristot de Oliveira (3): tracing/osnoise: Switch from PF_NO_SETAFFINITY to migrate_disable tracing/osnoise: Skip running osnoise if all instances are off tracing/timerlat: Add user-space interface Documentation/trace/timerlat-tracer.rst | 78 +++++ kernel/trace/trace_osnoise.c | 411 +++++++++++++++++++++++- kernel/trace/trace_output.c | 4 +- 3 files changed, 487 insertions(+), 6 deletions(-)