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=-14.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 5C648C43387 for ; Tue, 18 Dec 2018 22:13:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 29EE5217D9 for ; Tue, 18 Dec 2018 22:13:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545171212; bh=DoXv6SwlrgG/eyjDqStJUjknRRYHo7GebEVgwxuZbes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KQhJ8UAHC8rWR/urdadhzLVQwaZ6kWFWqJt7LRYMUtayZc4L+xyDQSkxnJzcBSvCs UQpq5mSn/XWfU2yf7bm1j/AjmCugrvZ3+vlkpOWkyxRdE9jwawW0iOHuDckGNHfV9B aWj8qs4Vu1kY0T1Tai0KA70KffriLUm1qCysd4D0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727028AbeLRWNb (ORCPT ); Tue, 18 Dec 2018 17:13:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:42438 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726536AbeLRWN3 (ORCPT ); Tue, 18 Dec 2018 17:13:29 -0500 Received: from quaco.ghostprotocols.net (unknown [189.40.101.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B8CA5217D9; Tue, 18 Dec 2018 22:13:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545171208; bh=DoXv6SwlrgG/eyjDqStJUjknRRYHo7GebEVgwxuZbes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bSXrKh5obh3ZRJN9/3W11Odsv5PSVOgiu2k3JLUkysApG9rLh611xYOqWFphsj3Ou MEsnHxF6M2rwpkZLyHCkhoD7QjTA5cidzD00uySYJw67WZoiPmBNIHvcuIVVjVpz4w QXyZ3meCVnrbjrPSXo+BTvX+4f+oLaAuXL5zm3kE= From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , Jiri Olsa , =?UTF-8?q?Luis=20Cl=C3=A1udio=20Gon=C3=A7alves?= , Namhyung Kim , Wang Nan Subject: [PATCH 39/63] perf trace: Allow configuring default for perf_event_attr.inherit Date: Tue, 18 Dec 2018 19:07:09 -0300 Message-Id: <20181218220733.15839-40-acme@kernel.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181218220733.15839-1-acme@kernel.org> References: <20181218220733.15839-1-acme@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo I.f. if children should inherit the parent perf_event configuration, i.e. if we should trace children as well or just the parent. The default is to follow children, to disable this and have a behaviour similar to strace, set this config option or use the --no_inherit 'perf trace' option. E.g.: Default: # perf config trace.no_inherit # trace -e clone,*sleep time sleep 1 0.000 time/21107 clone(clone_flags: CHILD_CLEARTID|CHILD_SETTID|0x11, newsp: 0, child_tidptr: 0x7f7b8f9ae810) = 21108 (time) ? time/21108 ... [continued]: clone() 0.691 sleep/21108 nanosleep(rqtp: 0x7ffed01d0540, rmtp: 0 ) = 0 0.00user 0.00system 0:01.00elapsed 0%CPU (0avgtext+0avgdata 1988maxresident)k 0inputs+0outputs (0major+76minor)pagefaults 0swaps # Disable it: # trace -e clone,*sleep time sleep 1 0.000 clone(clone_flags: CHILD_CLEARTID|CHILD_SETTID|0x11, newsp: 0, child_tidptr: 0x7ff41e100810) = 21414 (time) 0.00user 0.00system 0:01.00elapsed 0%CPU (0avgtext+0avgdata 1964maxresident)k 0inputs+0outputs (0major+76minor)pagefaults 0swaps # Notice that since there is just one thread, the "comm/TID" column is suppressed. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-thd8s16pagyza71ufi5vjlan@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-config.txt | 3 +++ tools/perf/builtin-trace.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt index 0d641b0d15ae..cd9bf12fb255 100644 --- a/tools/perf/Documentation/perf-config.txt +++ b/tools/perf/Documentation/perf-config.txt @@ -529,6 +529,9 @@ trace.*:: activate the 'perf trace' logic that looks for syscall pointer contents after the normal tracepoint payload. + trace.no_inherit:: + Do not follow children threads. + trace.show_duration:: Show syscall duration. diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 4355dadad232..a4e2290e57e0 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -3542,6 +3542,8 @@ static int trace__config(const char *var, const char *value, void *arg) trace->show_duration = perf_config_bool(var, value); } else if (!strcmp(var, "trace.show_zeros")) { trace->show_zeros = perf_config_bool(var, value); + } else if (!strcmp(var, "trace.no_inherit")) { + trace->opts.no_inherit = perf_config_bool(var, value); } return err; -- 2.19.2