From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755598AbbHLMjA (ORCPT ); Wed, 12 Aug 2015 08:39:00 -0400 Received: from terminus.zytor.com ([198.137.202.10]:42751 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754625AbbHLMi5 (ORCPT ); Wed, 12 Aug 2015 08:38:57 -0400 Date: Wed, 12 Aug 2015 05:38:24 -0700 From: tip-bot for Peter Zijlstra Message-ID: Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, efault@gmx.de, torvalds@linux-foundation.org, tglx@linutronix.de, hpa@zytor.com, peterz@infradead.org Reply-To: linux-kernel@vger.kernel.org, mingo@kernel.org, efault@gmx.de, torvalds@linux-foundation.org, tglx@linutronix.de, peterz@infradead.org, hpa@zytor.com In-Reply-To: <20150515154833.614517487@infradead.org> References: <20150515154833.614517487@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched: Make sched_class::set_cpus_allowed() unconditional Git-Commit-ID: c5b2803840817115e9b568d5054e5007ae36176b 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: c5b2803840817115e9b568d5054e5007ae36176b Gitweb: http://git.kernel.org/tip/c5b2803840817115e9b568d5054e5007ae36176b Author: Peter Zijlstra AuthorDate: Fri, 15 May 2015 17:43:35 +0200 Committer: Ingo Molnar CommitDate: Wed, 12 Aug 2015 12:06:09 +0200 sched: Make sched_class::set_cpus_allowed() unconditional Give every class a set_cpus_allowed() method, this enables some small optimization in the RT,DL implementation by avoiding a double cpumask_weight() call. Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: dedekind1@gmail.com Cc: juri.lelli@arm.com Cc: mgorman@suse.de Cc: riel@redhat.com Cc: rostedt@goodmis.org Link: http://lkml.kernel.org/r/20150515154833.614517487@infradead.org Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 17 +++++++++++------ kernel/sched/deadline.c | 20 ++++++++++++-------- kernel/sched/fair.c | 1 + kernel/sched/idle_task.c | 1 + kernel/sched/rt.c | 12 ++++++++---- kernel/sched/sched.h | 2 ++ kernel/sched/stop_task.c | 1 + 7 files changed, 36 insertions(+), 18 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2e3b983..740f90b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1151,17 +1151,22 @@ static int migration_cpu_stop(void *data) return 0; } -void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +/* + * sched_class::set_cpus_allowed must do the below, but is not required to + * actually call this function. + */ +void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask) { - lockdep_assert_held(&p->pi_lock); - - if (p->sched_class->set_cpus_allowed) - p->sched_class->set_cpus_allowed(p, new_mask); - cpumask_copy(&p->cpus_allowed, new_mask); p->nr_cpus_allowed = cpumask_weight(new_mask); } +void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +{ + lockdep_assert_held(&p->pi_lock); + p->sched_class->set_cpus_allowed(p, new_mask); +} + /* * Change a given task's CPU affinity. Migrate the thread to a * proper CPU and schedule it away if the CPU it's executing on diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 20772ee..dc357fa 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1696,13 +1696,6 @@ static void set_cpus_allowed_dl(struct task_struct *p, raw_spin_unlock(&src_dl_b->lock); } - /* - * Update only if the task is actually running (i.e., - * it is on the rq AND it is not throttled). - */ - if (!on_dl_rq(&p->dl)) - return; - weight = cpumask_weight(new_mask); /* @@ -1710,7 +1703,14 @@ static void set_cpus_allowed_dl(struct task_struct *p, * can migrate or not. */ if ((p->nr_cpus_allowed > 1) == (weight > 1)) - return; + goto done; + + /* + * Update only if the task is actually running (i.e., + * it is on the rq AND it is not throttled). + */ + if (!on_dl_rq(&p->dl)) + goto done; /* * The process used to be able to migrate OR it can now migrate @@ -1727,6 +1727,10 @@ static void set_cpus_allowed_dl(struct task_struct *p, } update_dl_migration(&rq->dl); + +done: + cpumask_copy(&p->cpus_allowed, new_mask); + p->nr_cpus_allowed = weight; } /* Assumes rq->lock is held */ diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f0950fd..6e2e348 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -8252,6 +8252,7 @@ const struct sched_class fair_sched_class = { .task_waking = task_waking_fair, .task_dead = task_dead_fair, + .set_cpus_allowed = set_cpus_allowed_common, #endif .set_curr_task = set_curr_task_fair, diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c index c65dac8..c4ae0f1 100644 --- a/kernel/sched/idle_task.c +++ b/kernel/sched/idle_task.c @@ -96,6 +96,7 @@ const struct sched_class idle_sched_class = { #ifdef CONFIG_SMP .select_task_rq = select_task_rq_idle, + .set_cpus_allowed = set_cpus_allowed_common, #endif .set_curr_task = set_curr_task_idle, diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 00816ee..63692ef 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -2084,9 +2084,6 @@ static void set_cpus_allowed_rt(struct task_struct *p, BUG_ON(!rt_task(p)); - if (!task_on_rq_queued(p)) - return; - weight = cpumask_weight(new_mask); /* @@ -2094,7 +2091,10 @@ static void set_cpus_allowed_rt(struct task_struct *p, * can migrate or not. */ if ((p->nr_cpus_allowed > 1) == (weight > 1)) - return; + goto done; + + if (!task_on_rq_queued(p)) + goto done; rq = task_rq(p); @@ -2113,6 +2113,10 @@ static void set_cpus_allowed_rt(struct task_struct *p, } update_rt_migration(&rq->rt); + +done: + cpumask_copy(&p->cpus_allowed, new_mask); + p->nr_cpus_allowed = weight; } /* Assumes rq->lock is held */ diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 22ccc55..68cda11 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1255,6 +1255,8 @@ extern void trigger_load_balance(struct rq *rq); extern void idle_enter_fair(struct rq *this_rq); extern void idle_exit_fair(struct rq *this_rq); +extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); + #else static inline void idle_enter_fair(struct rq *rq) { } diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c index 79ffec4..cbc67da 100644 --- a/kernel/sched/stop_task.c +++ b/kernel/sched/stop_task.c @@ -123,6 +123,7 @@ const struct sched_class stop_sched_class = { #ifdef CONFIG_SMP .select_task_rq = select_task_rq_stop, + .set_cpus_allowed = set_cpus_allowed_common, #endif .set_curr_task = set_curr_task_stop,