From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751838AbaBKMQf (ORCPT ); Tue, 11 Feb 2014 07:16:35 -0500 Received: from terminus.zytor.com ([198.137.202.10]:46480 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750767AbaBKMQd (ORCPT ); Tue, 11 Feb 2014 07:16:33 -0500 Date: Tue, 11 Feb 2014 04:16:01 -0800 From: tip-bot for Daniel Lezcano Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, daniel.lezcano@linaro.org Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, daniel.lezcano@linaro.org In-Reply-To: <1389949444-14821-3-git-send-email-daniel.lezcano@linaro.org> References: <1389949444-14821-3-git-send-email-daniel.lezcano@linaro.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched: Move rq->idle_stamp up to the core Git-Commit-ID: 3c4017c13f91069194fce3160944efec50f15a6e 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 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.1 (terminus.zytor.com [127.0.0.1]); Tue, 11 Feb 2014 04:16:07 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 3c4017c13f91069194fce3160944efec50f15a6e Gitweb: http://git.kernel.org/tip/3c4017c13f91069194fce3160944efec50f15a6e Author: Daniel Lezcano AuthorDate: Fri, 17 Jan 2014 10:04:03 +0100 Committer: Ingo Molnar CommitDate: Mon, 10 Feb 2014 16:17:07 +0100 sched: Move rq->idle_stamp up to the core idle_balance() modifies the rq->idle_stamp field, making this information shared across core.c and fair.c. As we know if the cpu is going to idle or not with the previous patch, let's encapsulate the rq->idle_stamp information in core.c by moving it up to the caller. The idle_balance() function returns true in case a balancing occured and the cpu won't be idle, false if no balance happened and the cpu is going idle. Signed-off-by: Daniel Lezcano Cc: alex.shi@linaro.org Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1389949444-14821-3-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 11 +++++++++-- kernel/sched/fair.c | 14 ++++++-------- kernel/sched/sched.h | 2 +- 3 files changed, 16 insertions(+), 11 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 74dd565..417cf65 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2704,8 +2704,15 @@ need_resched: pre_schedule(rq, prev); - if (unlikely(!rq->nr_running)) - idle_balance(rq); + if (unlikely(!rq->nr_running)) { + /* + * We must set idle_stamp _before_ calling idle_balance(), such + * that we measure the duration of idle_balance() as idle time. + */ + rq->idle_stamp = rq_clock(rq); + if (idle_balance(rq)) + rq->idle_stamp = 0; + } put_prev_task(rq, prev); next = pick_next_task(rq); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 5ebc681..04fea77 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6531,7 +6531,7 @@ out: * idle_balance is called by schedule() if this_cpu is about to become * idle. Attempts to pull tasks from other CPUs. */ -void idle_balance(struct rq *this_rq) +int idle_balance(struct rq *this_rq) { struct sched_domain *sd; int pulled_task = 0; @@ -6539,10 +6539,8 @@ void idle_balance(struct rq *this_rq) u64 curr_cost = 0; int this_cpu = this_rq->cpu; - this_rq->idle_stamp = rq_clock(this_rq); - if (this_rq->avg_idle < sysctl_sched_migration_cost) - return; + return 0; /* * Drop the rq->lock, but keep IRQ/preempt disabled. @@ -6580,10 +6578,8 @@ void idle_balance(struct rq *this_rq) interval = msecs_to_jiffies(sd->balance_interval); if (time_after(next_balance, sd->last_balance + interval)) next_balance = sd->last_balance + interval; - if (pulled_task) { - this_rq->idle_stamp = 0; + if (pulled_task) break; - } } rcu_read_unlock(); @@ -6594,7 +6590,7 @@ void idle_balance(struct rq *this_rq) * A task could have be enqueued in the meantime */ if (this_rq->nr_running && !pulled_task) - return; + return 1; if (pulled_task || time_after(jiffies, this_rq->next_balance)) { /* @@ -6606,6 +6602,8 @@ void idle_balance(struct rq *this_rq) if (curr_cost > this_rq->max_idle_balance_cost) this_rq->max_idle_balance_cost = curr_cost; + + return pulled_task; } /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 82c0e02..bb89991 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1158,7 +1158,7 @@ extern const struct sched_class idle_sched_class; extern void update_group_power(struct sched_domain *sd, int cpu); extern void trigger_load_balance(struct rq *rq); -extern void idle_balance(struct rq *this_rq); +extern int idle_balance(struct rq *this_rq); extern void idle_enter_fair(struct rq *this_rq); extern void idle_exit_fair(struct rq *this_rq);