From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754321AbZKWHQY (ORCPT ); Mon, 23 Nov 2009 02:16:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753236AbZKWHQX (ORCPT ); Mon, 23 Nov 2009 02:16:23 -0500 Received: from hera.kernel.org ([140.211.167.34]:55177 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225AbZKWHQW (ORCPT ); Mon, 23 Nov 2009 02:16:22 -0500 Date: Mon, 23 Nov 2009 07:15:48 GMT From: tip-bot for Ingo Molnar Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, a.p.zijlstra@chello.nl, efault@gmx.de, fweisbec@gmail.com, rostedt@goodmis.org, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, fweisbec@gmail.com, rostedt@goodmis.org, a.p.zijlstra@chello.nl, efault@gmx.de, tglx@linutronix.de, mingo@elte.hu In-Reply-To: References: To: linux-tip-commits@vger.kernel.org Subject: [tip:tracing/core] ring-buffer benchmark: Run producer/consumer threads at nice +19 Message-ID: Git-Commit-ID: 98e4833ba3c314c99dc364012fba6ac894230ad0 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 98e4833ba3c314c99dc364012fba6ac894230ad0 Gitweb: http://git.kernel.org/tip/98e4833ba3c314c99dc364012fba6ac894230ad0 Author: Ingo Molnar AuthorDate: Mon, 23 Nov 2009 08:03:09 +0100 Committer: Ingo Molnar CommitDate: Mon, 23 Nov 2009 08:03:09 +0100 ring-buffer benchmark: Run producer/consumer threads at nice +19 The ring-buffer benchmark threads run on nice 0 by default, using up a lot of CPU time and slowing down the system: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1024 root 20 0 0 0 0 D 95.3 0.0 4:01.67 rb_producer 1023 root 20 0 0 0 0 R 93.5 0.0 2:54.33 rb_consumer 21569 mingo 40 0 14852 1048 772 R 3.6 0.1 0:00.05 top 1 root 40 0 4080 928 668 S 0.0 0.0 0:23.98 init Renice them to +19 to make them less intrusive. Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Mike Galbraith LKML-Reference: Signed-off-by: Ingo Molnar --- kernel/trace/ring_buffer_benchmark.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 70df73e..3875d49 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -399,6 +399,12 @@ static int __init ring_buffer_benchmark_init(void) if (IS_ERR(producer)) goto out_kill; + /* + * Run them as low-prio background tasks by default: + */ + set_user_nice(consumer, 19); + set_user_nice(producer, 19); + return 0; out_kill: