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 19384C43441 for ; Thu, 22 Nov 2018 03:36:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D3E4720878 for ; Thu, 22 Nov 2018 03:36:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="fslmlRF8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D3E4720878 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 S2404283AbeKVOOM (ORCPT ); Thu, 22 Nov 2018 09:14:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:55676 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404188AbeKVOOK (ORCPT ); Thu, 22 Nov 2018 09:14:10 -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 C20BD20870; Thu, 22 Nov 2018 03:36:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542857805; bh=o8VUX1RIC82TqpDpDQnjMxilk37Wr7YdOX3FBvkkRzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fslmlRF8BdVUFC1YzsyCcqv5o55kfVsVXlbnPUI58FbAu9l1SOFxNeLB3ayg57EHk lLxLi6g49+Ij6mktoz91ESOzbJB9PGEx06U7ORKffekyxJT2Or7RYeMkoPLgNp5Q3O v8rzN5acJiohYxUoBY8xamWlPJMQQsdpHBJ2W7Q8= 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 07/28] perf augmented_syscalls: Use pid_filter Date: Thu, 22 Nov 2018 00:35:50 -0300 Message-Id: <20181122033611.15890-8-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 test filtering a bunch of pids, now its time to go and get that hooked up in 'perf trace', right after we load the bpf program, if we find a "pids_filtered" map defined, we'll populate it with the filtered pids. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-1i9s27wqqdhafk3fappow84x@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/examples/bpf/augmented_raw_syscalls.c | 34 ++++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index 7d729319618c..5fed1eff889d 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -16,6 +16,7 @@ #include #include +#include /* bpf-output associated map */ struct bpf_map SEC("maps") __augmented_syscalls__ = { @@ -48,6 +49,29 @@ struct augmented_filename { #define SYS_POLL 7 #define SYS_OPENAT 257 +pid_filter(pids_filtered); + +static void pid_filter__init(void) +{ + /* + * Filter a bunch of pids: gnome-shell, kvm, firefox threads, + * avahi-daemon, etc, just for testing as we go along. + * + * These will come from 'perf trace --filter-pids' in a explicit way + * and also it will filter out itself, to avoid the feedback loop: + * syscalls 'perf trace' does gets caught, reported, causing new + * syscalls to get emitted, rinse repeat forever. + */ + if (pid_filter__add(&pids_filtered, 2971)) + return; /* pid_filter__init() was already called, bail out */ + pid_filter__add(&pids_filtered, 20016); + pid_filter__add(&pids_filtered, 12018); + pid_filter__add(&pids_filtered, 2310); + pid_filter__add(&pids_filtered, 3759); + pid_filter__add(&pids_filtered, 25978); + pid_filter__add(&pids_filtered, 883); +} + SEC("raw_syscalls:sys_enter") int sys_enter(struct syscall_enter_args *args) { @@ -57,8 +81,14 @@ int sys_enter(struct syscall_enter_args *args) } augmented_args; unsigned int len = sizeof(augmented_args); const void *filename_arg = NULL; + /* + * We still don't have a "main()" called first and only once + * call it always, it will exit as soon as it realizes the + * first hard coded filtered pid was already added. + */ + pid_filter__init(); - if (getpid() == 2971) + if (pid_filter__has(&pids_filtered, getpid())) return 0; probe_read(&augmented_args.args, sizeof(augmented_args.args), args); @@ -132,7 +162,7 @@ int sys_enter(struct syscall_enter_args *args) SEC("raw_syscalls:sys_exit") int sys_exit(struct syscall_exit_args *args) { - return getpid() != 2971; + return !pid_filter__has(&pids_filtered, getpid()); } license(GPL); -- 2.14.5