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=-15.6 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,URIBL_BLOCKED,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 887B0C04EBA for ; Thu, 22 Nov 2018 03:36:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DAF42087E for ; Thu, 22 Nov 2018 03:36:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="LEyliJ8d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3DAF42087E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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 S2404213AbeKVON4 (ORCPT ); Thu, 22 Nov 2018 09:13:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:55354 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404188AbeKVON4 (ORCPT ); Thu, 22 Nov 2018 09:13:56 -0500 Received: from jouet.infradead.org (unknown [179.97.41.186]) (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 69A652080F; Thu, 22 Nov 2018 03:36:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542857790; bh=LQCTGUqw6dzx/msz6xY4/C5DIvZ1pdgTKSn/HJhnVn0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LEyliJ8d48sPk6wgBE97aGsjC+x1MSZLYn7udSiaFmAtcJ2AuNwQ/LmJxEzyrGfwF 7x22GXJBbUudy5MwewEUS0fpGO1zzqzFIYerX2ccDgGkyX4QScCYAZm8Yl0ecoIrKc y8UhR08MnOjm89uNLHdy+WW/M13rvNKd653n3/lE= 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 , David Ahern , Jiri Olsa , Namhyung Kim , Wang Nan Subject: [PATCH 02/28] perf augmented_syscalls: Filter on a hard coded pid Date: Thu, 22 Nov 2018 00:35:45 -0300 Message-Id: <20181122033611.15890-3-acme@kernel.org> X-Mailer: git-send-email 2.14.5 In-Reply-To: <20181122033611.15890-1-acme@kernel.org> References: <20181122033611.15890-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo 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); -- 2.14.5