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=-10.1 required=3.0 tests=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=ham 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 17D8EC433DF for ; Sat, 27 Jun 2020 13:37:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6DD72158C for ; Sat, 27 Jun 2020 13:37:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JfEcW93A" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726697AbgF0Nh1 (ORCPT ); Sat, 27 Jun 2020 09:37:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725850AbgF0NhY (ORCPT ); Sat, 27 Jun 2020 09:37:24 -0400 Received: from mail-pf1-x443.google.com (mail-pf1-x443.google.com [IPv6:2607:f8b0:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B61B5C061794 for ; Sat, 27 Jun 2020 06:37:24 -0700 (PDT) Received: by mail-pf1-x443.google.com with SMTP id x3so373463pfo.9 for ; Sat, 27 Jun 2020 06:37:24 -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=RENyP5GvJHo7XN0d/Qe1SArGpJjhI/hof2R5Na6f8JY=; b=JfEcW93AEw2uELbVjo0RdzTWoGw92CSJ156ZZ+q3dcFzddZl4DOWca8YGm6fTey5JU ZRwsyj0bbwwTt3OgqkV6nqWyZXBsDUH6QdOK6o1pUnmml+egpSscjjx+nirXDrkjKcnJ +Zoc+XEP5NRqh4r6hQJD5040tcQL79qHLh6BtQzBvItREPHjxQnkvDcOTLmTdSmLZfDl re/PoY6vdxJjWDNb9LNHuDhCjbkascIAJN2SLDruqx2CdWPb//6UYOaw6n/VnxDiB7su s9BrXUEOdniaOBrX2bZw6x1e7dLLI/3igk5wdQX8viVXhV2x0e9M+mcGWQVqFdqPYJIU s+tA== 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=RENyP5GvJHo7XN0d/Qe1SArGpJjhI/hof2R5Na6f8JY=; b=i/waDoMGhgGHUQ39G8XACp8VdvVJSZAp4/Rg39/pw7FS+VGajkvKcGAs36jum1i4dI rM7/Dk2+CvzNX/yFjIZAGadUYFaqts1Zez5VwJ0mVTx61xdvOUw1EmXsaldt9GvVXT0/ CLBFqx73wnEM7f/929D71oqtITSQr8Wuz9sX1CnMBYhuSp9Cu3QUXa2M8N33qFvmHPdE AKepF/fMXzpFNzJtmjc0eFWxfJdC8MbRwwnv4sJFGAmk8YU/gsXMKwhnjUiXWXKscl8P +KcvBKv6zmUXSPgochgb+OUnw+708fejeX6lkliai1UpRPzkqKdco+NUwMOP1a7Xfrm1 +TIA== X-Gm-Message-State: AOAM533ntYerJc8ngkhZz7+cSFDimqXGNbl4JK1IZuaeRfEONXlrmWSs 3ncw59wU84bA+OMMEBbe8Jk= X-Google-Smtp-Source: ABdhPJxn0JNVOLiPAY/QjYD7O6shV7BcQza0pj87LONKmK7zTmByb2GyqBQ36xu7pIpGQSMaFO80eg== X-Received: by 2002:aa7:9ec7:: with SMTP id r7mr6696345pfq.317.1593265044241; Sat, 27 Jun 2020 06:37:24 -0700 (PDT) Received: from vultr.guest ([149.248.10.52]) by smtp.gmail.com with ESMTPSA id x8sm15060086pje.31.2020.06.27.06.37.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 27 Jun 2020 06:37:23 -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 v2 02/15] perf ftrace: add option '-F/--funcs' to list available functions Date: Sat, 27 Jun 2020 21:36:41 +0800 Message-Id: <20200627133654.64863-3-changbin.du@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200627133654.64863-1-changbin.du@gmail.com> References: <20200627133654.64863-1-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 '-F/--funcs' to list all available functions to trace, which is read from tracing file 'available_filter_functions'. $ sudo ./perf ftrace -F | head trace_initcall_finish_cb initcall_blacklisted do_one_initcall do_one_initcall trace_initcall_start_cb run_init_process try_to_run_init_process match_dev_by_label match_dev_by_uuid rootfs_init_fs_context Signed-off-by: Changbin Du --- v2: option name '-l/--list-functions' -> '-F/--funcs' --- tools/perf/Documentation/perf-ftrace.txt | 4 +++ tools/perf/builtin-ftrace.c | 43 ++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index 952e46669168..d79560dea19f 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -30,6 +30,10 @@ OPTIONS --verbose=:: Verbosity level. +-F:: +--funcs:: + List all available functions to trace. + -p:: --pid=:: Trace on existing process id (comma separated list). diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index c5718503eded..e793118e83a9 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -32,6 +32,7 @@ struct perf_ftrace { struct evlist *evlist; struct target target; const char *tracer; + bool list_avail_functions; struct list_head filters; struct list_head notrace; struct list_head graph_funcs; @@ -127,6 +128,43 @@ static int append_tracing_file(const char *name, const char *val) return __write_tracing_file(name, val, true); } +static int read_tracing_file_to_stdout(const char *name) +{ + char buf[4096]; + char *file; + int fd; + int ret = -1; + + file = get_tracing_file(name); + if (!file) { + pr_debug("cannot get tracing file: %s\n", name); + return -1; + } + + fd = open(file, O_RDONLY); + if (fd < 0) { + pr_debug("cannot open tracing file: %s: %s\n", + name, str_error_r(errno, buf, sizeof(buf))); + goto out; + } + + /* read contents to stdout */ + while (true) { + int n = read(fd, buf, sizeof(buf)); + if (n <= 0) + goto out_close; + if (fwrite(buf, n, 1, stdout) != 1) + goto out_close; + } + ret = 0; + +out_close: + close(fd); +out: + put_tracing_file(file); + return ret; +} + static int reset_tracing_cpu(void); static void reset_tracing_filters(void); @@ -301,6 +339,9 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) signal(SIGCHLD, sig_handler); signal(SIGPIPE, sig_handler); + if (ftrace->list_avail_functions) + return read_tracing_file_to_stdout("available_filter_functions"); + if (reset_tracing_files(ftrace) < 0) { pr_err("failed to reset ftrace\n"); goto out; @@ -470,6 +511,8 @@ int cmd_ftrace(int argc, const char **argv) const struct option ftrace_options[] = { OPT_STRING('t', "tracer", &ftrace.tracer, "tracer", "tracer to use: function or function_graph (This option is deprecated)"), + OPT_BOOLEAN('F', "funcs", &ftrace.list_avail_functions, + "Show available functions to filter"), OPT_STRING('p', "pid", &ftrace.target.pid, "pid", "trace on existing process id"), OPT_INCR('v', "verbose", &verbose, -- 2.25.1