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=-9.6 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 7CED5C38A2A for ; Sun, 10 May 2020 15:08:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58FA520735 for ; Sun, 10 May 2020 15:08:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="eGu1Qv/k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729191AbgEJPII (ORCPT ); Sun, 10 May 2020 11:08:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726104AbgEJPII (ORCPT ); Sun, 10 May 2020 11:08:08 -0400 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13EDFC061A0C for ; Sun, 10 May 2020 08:08:08 -0700 (PDT) Received: by mail-pl1-x642.google.com with SMTP id f15so2816008plr.3 for ; Sun, 10 May 2020 08:08:08 -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=/D51KRBfgHPLGzkJHJadx75PdlayeJcRyxV0asK4CGE=; b=eGu1Qv/kM3GdK+nvznzbqKw34j7nL438tQBFsg1roMiLyjvQKXlicBKTnZB6svOqrY tFyqKAU7h9YSg11POJZtDFZ51372dNIPJPLJuQHm6Fq2YaxOXQRgFOZKc29xvHGUrYdG cpomvqg9NUGU4nl6zk2Ol9+ijSr+fkCX2bjYzs4wS8dQ/GpSPoZ7D58A1+844fqeYJ55 Q/FqN1tLlhrhdLXetIcyTdYv9dbNOQDRs19/XNmbZeMndkuovTx2GY9nrhimzdgqyuc5 uGkcuNlVvTPszjT7JCzJuR0AH6FCyeaotjqyddlHkP/tkxX0lMOUOmlWFFNEucgYKr4+ viMQ== 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=/D51KRBfgHPLGzkJHJadx75PdlayeJcRyxV0asK4CGE=; b=hDNmmJqDQkIjk+BUuy8MW5dPT898+SQnZAFq6tSEEXqmYWHcptE3RSWNsqfVKWA8pt 5hTdApSSre4D6qsLN1oEnuBuHurNj5HyYX+2Kf7667WzX87StLvbIxYELgebUMvNMQAi KJtGS06xPSRNqmw+K6x1v4SBQdyAgHpHG/5NFGX7bVRj8BACpwa94JUf809Wlm+aVfml hwG3HdhhxREjubqfBJGGWOsseoxeXJ1AE9bAw0q8ohD00BD1ugtvx8PXWj6jDPD6MP0n nX69gKBLi+X5Ud/HdpTFy/E+2g6BzkR/KAmSBADScr+bgFop55icD87epwcOsra0Kv7x WoPg== X-Gm-Message-State: AGi0PuZXd5U0emJZuUc0+Y8J7ACKqt32lxI13Mhyr9CxiuePCd86KWUD S5zPtj05IBzox+ugTqv6xB4= X-Google-Smtp-Source: APiQypKHeaxe3Sp3XFVqZIYonY1qvwDML2T6CynWtcBwkkvY1H2guDx6tSmP7Ncd7Qpz+eIcPDAHWw== X-Received: by 2002:a17:90a:d17:: with SMTP id t23mr17566493pja.77.1589123287626; Sun, 10 May 2020 08:08:07 -0700 (PDT) Received: from vultr.guest ([149.248.10.52]) by smtp.gmail.com with ESMTPSA id v7sm6870909pfm.146.2020.05.10.08.07.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 May 2020 08:08:06 -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 05/19] perf ftrace: add option '-l/--list-functions' to list available functions Date: Sun, 10 May 2020 23:06:14 +0800 Message-Id: <20200510150628.16610-6-changbin.du@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200510150628.16610-1-changbin.du@gmail.com> References: <20200510150628.16610-1-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 '-l/--list-functions' to list all available functions which is read from tracing file 'available_filter_functions'. Signed-off-by: Changbin Du --- tools/perf/builtin-ftrace.c | 43 +++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 1d30c2d5f88b..8133d910d5d8 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -33,6 +33,7 @@ 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; @@ -142,6 +143,43 @@ static int write_tracing_option_file(const char *name, const char *val) return ret; } +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); @@ -332,6 +370,9 @@ 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; @@ -483,6 +524,8 @@ int cmd_ftrace(int argc, const char **argv) NULL }; const struct option ftrace_options[] = { + OPT_BOOLEAN('L', "list-functions", &ftrace.list_avail_functions, + "List 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