From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752263AbbCJKIg (ORCPT ); Tue, 10 Mar 2015 06:08:36 -0400 Received: from terminus.zytor.com ([198.137.202.10]:48120 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751892AbbCJKId (ORCPT ); Tue, 10 Mar 2015 06:08:33 -0400 Date: Tue, 10 Mar 2015 03:07:46 -0700 From: tip-bot for Wanpeng Li Message-ID: Cc: tglx@linutronix.de, peterz@infradead.org, juri.lelli@arm.com, mingo@kernel.org, linux-kernel@vger.kernel.org, hpa@zytor.com, wanpeng.li@linux.intel.com Reply-To: wanpeng.li@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, juri.lelli@arm.com, mingo@kernel.org, tglx@linutronix.de, peterz@infradead.org In-Reply-To: <1425961200-3809-1-git-send-email-wanpeng.li@linux.intel.com> References: <1425961200-3809-1-git-send-email-wanpeng.li@linux.intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/deadline: Add rq-> clock update skip for dl task yield Git-Commit-ID: 44fb085bfa17628c6d2aaa6af6b292a8499e9cbd 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 44fb085bfa17628c6d2aaa6af6b292a8499e9cbd Gitweb: http://git.kernel.org/tip/44fb085bfa17628c6d2aaa6af6b292a8499e9cbd Author: Wanpeng Li AuthorDate: Tue, 10 Mar 2015 12:20:00 +0800 Committer: Ingo Molnar CommitDate: Tue, 10 Mar 2015 05:46:50 +0100 sched/deadline: Add rq->clock update skip for dl task yield This patch adds rq->clock update skip for SCHED_DEADLINE task yield, to tell update_rq_clock() that we've just updated the clock, so that we don't do a microscopic update in schedule() and double the fastpath cost. Signed-off-by: Wanpeng Li Cc: Juri Lelli Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1425961200-3809-1-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar --- kernel/sched/deadline.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 3fa8fa6..0a81a95 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -914,6 +914,12 @@ static void yield_task_dl(struct rq *rq) } update_rq_clock(rq); update_curr_dl(rq); + /* + * Tell update_rq_clock() that we've just updated, + * so we don't do microscopic update in schedule() + * and double the fastpath cost. + */ + rq_clock_skip_update(rq, true); } #ifdef CONFIG_SMP