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=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 AFF40C43441 for ; Thu, 22 Nov 2018 07:01:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F7CB20864 for ; Thu, 22 Nov 2018 07:01:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7F7CB20864 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392363AbeKVRjm (ORCPT ); Thu, 22 Nov 2018 12:39:42 -0500 Received: from terminus.zytor.com ([198.137.202.136]:55699 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732578AbeKVRjm (ORCPT ); Thu, 22 Nov 2018 12:39:42 -0500 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id wAM71SvT3688980 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 21 Nov 2018 23:01:28 -0800 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id wAM71R673688976; Wed, 21 Nov 2018 23:01:27 -0800 Date: Wed, 21 Nov 2018 23:01:27 -0800 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Arnaldo Carvalho de Melo Message-ID: Cc: jolsa@kernel.org, hpa@zytor.com, dsahern@gmail.com, acme@redhat.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, adrian.hunter@intel.com, namhyung@kernel.org, mingo@kernel.org, wangnan0@huawei.com Reply-To: hpa@zytor.com, dsahern@gmail.com, acme@redhat.com, jolsa@kernel.org, wangnan0@huawei.com, mingo@kernel.org, namhyung@kernel.org, adrian.hunter@intel.com, tglx@linutronix.de, linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf augmented_syscalls: Filter on a hard coded pid Git-Commit-ID: 55f127b43143363d000165c7cb72e4b95de1380d X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 55f127b43143363d000165c7cb72e4b95de1380d Gitweb: https://git.kernel.org/tip/55f127b43143363d000165c7cb72e4b95de1380d Author: Arnaldo Carvalho de Melo AuthorDate: Tue, 6 Nov 2018 15:23:40 -0300 Committer: Arnaldo Carvalho de Melo CommitDate: Wed, 21 Nov 2018 12:00:31 -0300 perf augmented_syscalls: Filter on a hard coded pid Just to show where we'll hook pid based filters, and what we use to obtain the current pid, using a BPF getpid() equivalent. Now we need to remove that hardcoded PID with a BPF hash map, so that we start by filtering 'perf trace's own PID, implement the --filter-pid functionality, etc. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-oshrcgcekiyhd0whwisxfvtv@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/examples/bpf/augmented_raw_syscalls.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index 90a19336310b..2feb00018f79 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -15,6 +15,7 @@ */ #include +#include #include /* bpf-output associated map */ @@ -56,6 +57,9 @@ int sys_enter(struct syscall_enter_args *args) unsigned int len = sizeof(augmented_args); const void *filename_arg = NULL; + if (getpid() == 2971) + return 0; + probe_read(&augmented_args.args, sizeof(augmented_args.args), args); /* * Yonghong and Edward Cree sayz: @@ -125,7 +129,7 @@ int sys_enter(struct syscall_enter_args *args) SEC("raw_syscalls:sys_exit") int sys_exit(struct syscall_exit_args *args) { - return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ + return getpid() != 2971; } license(GPL);