From patchwork Tue Jun 6 15:12:24 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: 13269370 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 AFD88C7EE24 for ; Tue, 6 Jun 2023 15:12:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236817AbjFFPMm (ORCPT ); Tue, 6 Jun 2023 11:12:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229454AbjFFPMl (ORCPT ); Tue, 6 Jun 2023 11:12:41 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA729126; Tue, 6 Jun 2023 08:12:40 -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 50EA862D9C; Tue, 6 Jun 2023 15:12:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB420C433D2; Tue, 6 Jun 2023 15:12:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686064359; bh=ITuf4mrMNHj/t/cxTj6fqNqlNYg9SVIt6Wm6jYSUlvY=; h=From:To:Cc:Subject:Date:From; b=ObpVg2cHrEJfu6omjONOeu3GmzqDcQWkISh/Z7xEO+kplX5zfjlU172bAEYHtRj8x uS7vI/Pp8oG4NKG8Y5vthywp52oR0eMaR0jOfuQ1p0/1uHw6+Mc4AzqVCOjKNnFmQH lS3zAHqKD5Z3ajwEPfCiQLBtjdQDR+bXksk1ncCol+v+l3jrxgSglb8tz913F6OaGD s13WQ4N+S2qfWQ9uCpP+NPpE3kDaW5RwoHlJ9r4Y7MRf4tw/jNhlSmINRlWgkcdowU /vMeCELk9uRVfQyOh5wafCTYF5di9BVmm/wSdqk7aw1wXI7hZi3SWA8SWEbwtHJFh1 Ked3W2xQgR5ig== 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 V3 0/3] osnoise/timerlat improvements Date: Tue, 6 Jun 2023 17:12:24 +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 V2: - Moved the migration check to a function hooked to the sched:sched_migration_task tracepoint - Fixed compilation errors with !CONFIG_TIMERLAT_TRACER (kernel test robot) - Made osnoise_create_cpu_timerlat_fd static (kernel test robot) - Link: https://lore.kernel.org/lkml/cover.1684860626.git.bristot@kernel.org/ 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 | 477 +++++++++++++++++++++++- kernel/trace/trace_output.c | 4 +- 3 files changed, 551 insertions(+), 8 deletions(-)