From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16A44C433EC for ; Sat, 11 Jul 2020 12:43:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA92E207BC for ; Sat, 11 Jul 2020 12:43:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="eI9LD59T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728548AbgGKMnr (ORCPT ); Sat, 11 Jul 2020 08:43:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51338 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728270AbgGKMnr (ORCPT ); Sat, 11 Jul 2020 08:43:47 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34E51C08C5DD for ; Sat, 11 Jul 2020 05:43:47 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id f16so3774459pjt.0 for ; Sat, 11 Jul 2020 05:43:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=nOXWUmqCKgzFvKP1q3KS/DuB4NZonBw3LPsVGjHfXdo=; b=eI9LD59T2k58X7twHTISTAkFP5gCTFwuWmlJKAIP/sh2vmAA3N2RYuBvtV/uxM5mMV yHsb3RQ6EM3fDl59ydPysyeO1x8V2u6t6b4+koEA2yw6qu6Q8qKiybfKtQoejThh86m5 bwgcqObfCih4E7opV2k7IqPKTJY1CIc9ffZ6fVvx9JQrzn1JIYNND76nGGbxJiNdE0rl J5DVGFGxJwVM0bA8407ahYYDhAkdSZQqszRkr8m+KGJP9qSxxNQk+MpRv5gDw388zxlq Rq3lG85GCkoPiWZcNsoo1hAvt866mPvmMGafp4oHO8jsVuzBtf0v9W+aA/4M8FqzYSpp TFRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=nOXWUmqCKgzFvKP1q3KS/DuB4NZonBw3LPsVGjHfXdo=; b=no2mE1GWWUC87YdObRgs+3uAqu5e47GOFnU7rEiw8rbYJND6mBRE3+RlrkDKTJgOh/ CzGUlM1FvUPa2W+XcF2gS1J6Kj7aiH3GGi+uc1PHAnDi7G6ZVxN4LqVsNRTF+PUqi99I 3rs30FPRf/D76JI2A9QxNVm9o3nakptGct6Kla66CLNderw4cmYeSvkYKQxiSBNSlCku i5HuG8qtqopkzb2IDQ71kWKmYqiHaiMhHii3KmcBkandXCJhRFWRaj6OPLb2Iy+Nwf6b JVUnuz9FVmLu0IDfSvHNlT1WFD5HO4OqH7QQQOaQLkAIeVWls8hlaRWpNJM64Fp80oKV Zd7g== X-Gm-Message-State: AOAM532EFguEsKN3GejqoQredwflDKuJzpCS/YrYnXSLD9N2BNWoi95l 0ErRxfKcrBd8DzEmczq/IXs= X-Google-Smtp-Source: ABdhPJytEYSvdanoa4ZHgaUBY8G28UnB9lLpWEZGHqeaH7rx4LqZpD58gBh6iIsgCF1YYCI6sPRHgg== X-Received: by 2002:a17:90b:1296:: with SMTP id fw22mr10680996pjb.20.1594471426829; Sat, 11 Jul 2020 05:43:46 -0700 (PDT) Received: from vultr.guest ([149.248.10.52]) by smtp.gmail.com with ESMTPSA id c19sm8352899pjs.11.2020.07.11.05.43.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2020 05:43:46 -0700 (PDT) From: Changbin Du To: Jiri Olsa , Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Ingo Molnar , Namhyung Kim , Steven Rostedt , linux-kernel@vger.kernel.org, Changbin Du Subject: [PATCH v5 16/17] perf ftrace: add option -D/--delay to delay tracing Date: Sat, 11 Jul 2020 20:40:34 +0800 Message-Id: <20200711124035.6513-17-changbin.du@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200711124035.6513-1-changbin.du@gmail.com> References: <20200711124035.6513-1-changbin.du@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds an option '-D/--delay' to allow us to start tracing some times later after workload is launched. Signed-off-by: Changbin Du --- tools/perf/Documentation/perf-ftrace.txt | 4 ++++ tools/perf/builtin-ftrace.c | 19 ++++++++++++++++--- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index 97d89478ff5f..62f56058de54 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -42,6 +42,10 @@ OPTIONS --tid=:: Trace on existing thread id (comma separated list). +-D:: +--delay:: + Time (ms) to wait before starting tracing after program start. + -a:: --all-cpus:: Force system-wide collection. Scripts run without a diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 86fc5d466e97..a70951938308 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -47,6 +47,7 @@ struct perf_ftrace { int graph_noirqs; int graph_verbose; int graph_thresh; + unsigned int initial_delay; }; struct filter_entry { @@ -591,13 +592,23 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) /* display column headers */ read_tracing_file_to_stdout("trace"); - if (write_tracing_file("tracing_on", "1") < 0) { - pr_err("can't enable tracing\n"); - goto out_close_fd; + if (!ftrace->initial_delay) { + if (write_tracing_file("tracing_on", "1") < 0) { + pr_err("can't enable tracing\n"); + goto out_close_fd; + } } perf_evlist__start_workload(ftrace->evlist); + if (ftrace->initial_delay) { + usleep(ftrace->initial_delay * 1000); + if (write_tracing_file("tracing_on", "1") < 0) { + pr_err("can't enable tracing\n"); + goto out_close_fd; + } + } + while (!done) { if (poll(&pollfd, 1, -1) < 0) break; @@ -808,6 +819,8 @@ int cmd_ftrace(int argc, const char **argv) "size of per cpu buffer", parse_buffer_size), OPT_BOOLEAN(0, "inherit", &ftrace.inherit, "trace children processes"), + OPT_UINTEGER('D', "delay", &ftrace.initial_delay, + "ms to wait before starting tracing after program start"), OPT_END() }; -- 2.25.1