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 39905C433DF for ; Sat, 27 Jun 2020 13:38:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14DBE21582 for ; Sat, 27 Jun 2020 13:38:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZffcuJu/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726775AbgF0NiI (ORCPT ); Sat, 27 Jun 2020 09:38:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726737AbgF0NiH (ORCPT ); Sat, 27 Jun 2020 09:38:07 -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 79AF0C03E979 for ; Sat, 27 Jun 2020 06:38:07 -0700 (PDT) Received: by mail-pl1-x642.google.com with SMTP id k1so5353563pls.2 for ; Sat, 27 Jun 2020 06:38:07 -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=Fy1K28Fcb/yrrbzootz0WKnVD3wVNq3gJQOpdR6OO00=; b=ZffcuJu/C7+pHA9U0uzq5UmEBSQxLPc8OyfeNc6w+zLLiZOztcSTSCabs0We+sBd/z v05Us8mltl+7am2x9JAsvz2zfFLEU+AUdJvseieCdoQdI57rtewrpNPRXyQrfM5hko5p Lqptddqd2iPU6IL4D5gzYV2ERBZ5K1qh/uwtAAGVjx3pj6MbP7BPOTb+5Yi6M0DnOxkL egO5FgFJUBjI7Lllc4lak+bwACw7OSAFumZyfYnfSRrwPs2EMfgy1LaAda26fqG9pevB L/8HOPBH8Ctwc27GZqe4dfbjuuRX9ha0fseDZfzIO6zq6L38fjX2kATSrtOokHSVEl2s TXvA== 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=Fy1K28Fcb/yrrbzootz0WKnVD3wVNq3gJQOpdR6OO00=; b=jEasHag0ULbfWxn75oOGh2dNscJU5P6bqs02sBRIKrocbMGvqIdn5xezvoLQNSIhOo c00vtf4z+uVRulCHN+zQHxg1WOZnGOCPNnF3Df+mYpCsW8zVR6v8ax0FTm/XasYMgyYC HPRmvYQiTUGKGC9c95NXHPZuukzbf4hmA07AS+E8XPC+xRjFSY3OSvsWMHf80UfPgmWG 8tdPNpGuqsoCaRkiiOHMVRVuO65AHgsFmhwvW2LzAhGlEBHUkl8Dt+LEsAxTFvahmXTh 3p9fjVNyXsvZI03nKSLblYebqZeYa+qfDX1gaVsPLEv19VosTSwjMjNIoboAJrj1x0ut XjBA== X-Gm-Message-State: AOAM53155kSwg8EIyrgyBhqNXRwbzNlnKSOoSx5QwgSx0e3ksFvMalXS 36hIjJ6WyOcANyH1kBsLIkY= X-Google-Smtp-Source: ABdhPJyG5xfIttzuIi+90/lx4HjV495j6W7FN5OSs3hh+Y4Dk0iSyitbtBgqfi/s9PfgTEEb4g33EA== X-Received: by 2002:a17:90a:e398:: with SMTP id b24mr8328357pjz.235.1593265087107; Sat, 27 Jun 2020 06:38:07 -0700 (PDT) Received: from vultr.guest ([149.248.10.52]) by smtp.gmail.com with ESMTPSA id x8sm15060086pje.31.2020.06.27.06.38.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 27 Jun 2020 06:38:06 -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 v2 06/15] perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size Date: Sat, 27 Jun 2020 21:36:45 +0800 Message-Id: <20200627133654.64863-7-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 '-m/--buffer-size' to allow us set the size of per-cpu tracing buffer. Signed-off-by: Changbin Du --- tools/perf/Documentation/perf-ftrace.txt | 4 ++++ tools/perf/builtin-ftrace.c | 22 ++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index fd1776deebd7..a18d640e90bb 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -60,6 +60,10 @@ OPTIONS Ranges of CPUs are specified with -: 0-2. Default is to trace on all online CPUs. +-m:: +--buffer-size:: + Set the size of per-cpu tracing buffer in KB. + -T:: --trace-funcs=:: Only trace functions given by the argument. Multiple functions diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 003efa756322..e45496012611 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -39,6 +39,7 @@ struct perf_ftrace { struct list_head nograph_funcs; int graph_depth; unsigned initial_delay; + unsigned buffer_size_kb; }; struct filter_entry { @@ -321,6 +322,20 @@ static int set_tracing_depth(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_buffer_size_kb(struct perf_ftrace *ftrace) +{ + int ret; + + if (ftrace->buffer_size_kb == 0) + return 0; + + ret = write_tracing_file_int("buffer_size_kb", ftrace->buffer_size_kb); + if (ret < 0) + return ret; + + return 0; +} + static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) { char *trace_file; @@ -385,6 +400,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_buffer_size_kb(ftrace) < 0) { + pr_err("failed to set tracing per-cpu buffer size\n"); + goto out_reset; + } + if (write_tracing_file("current_tracer", ftrace->tracer) < 0) { pr_err("failed to set current_tracer to %s\n", ftrace->tracer); goto out_reset; @@ -555,6 +575,8 @@ int cmd_ftrace(int argc, const char **argv) "Max depth for function graph tracer"), OPT_UINTEGER('d', "delay", &ftrace.initial_delay, "ms to wait before starting tracing after program start"), + OPT_UINTEGER('m', "buffer-size", &ftrace.buffer_size_kb, + "size of per cpu buffer in kb"), OPT_END() }; -- 2.25.1