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Commit 50605ffb authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

sched/core: Provide a tsk_nr_cpus_allowed() helper 



tsk_nr_cpus_allowed() is an accessor for task->nr_cpus_allowed which allows
us to change the representation of ->nr_cpus_allowed if required.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1462969411-17735-2-git-send-email-bigeasy@linutronix.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ade42e09

include/linux/sched.h

+5 −0
Original line number Diff line number Diff line
@@ -1930,6 +1930,11 @@ extern int arch_task_struct_size __read_mostly; 
/* Future-safe accessor for struct task_struct's cpus_allowed. */

#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)



static inline int tsk_nr_cpus_allowed(struct task_struct *p)

{

	return p->nr_cpus_allowed;

}



#define TNF_MIGRATED	0x01

#define TNF_NO_GROUP	0x02

#define TNF_SHARED	0x04

kernel/sched/core.c

+1 −1
Original line number Diff line number Diff line
@@ -1585,7 +1585,7 @@ int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags) 
{

	lockdep_assert_held(&p->pi_lock);



	if (p->nr_cpus_allowed > 1)

	if (tsk_nr_cpus_allowed(p) > 1)

		cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags);

	else

		cpu = cpumask_any(tsk_cpus_allowed(p));

kernel/sched/deadline.c

+14 −14
Original line number Diff line number Diff line
@@ -134,7 +134,7 @@ static void inc_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) 
{

	struct task_struct *p = dl_task_of(dl_se);



	if (p->nr_cpus_allowed > 1)

	if (tsk_nr_cpus_allowed(p) > 1)

		dl_rq->dl_nr_migratory++;



	update_dl_migration(dl_rq);
@@ -144,7 +144,7 @@ static void dec_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) 
{

	struct task_struct *p = dl_task_of(dl_se);



	if (p->nr_cpus_allowed > 1)

	if (tsk_nr_cpus_allowed(p) > 1)

		dl_rq->dl_nr_migratory--;



	update_dl_migration(dl_rq);
@@ -966,7 +966,7 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags) 


	enqueue_dl_entity(&p->dl, pi_se, flags);



	if (!task_current(rq, p) && p->nr_cpus_allowed > 1)

	if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1)

		enqueue_pushable_dl_task(rq, p);

}
@@ -1040,9 +1040,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags) 
	 * try to make it stay here, it might be important.

	 */

	if (unlikely(dl_task(curr)) &&

	    (curr->nr_cpus_allowed < 2 ||

	    (tsk_nr_cpus_allowed(curr) < 2 ||

	     !dl_entity_preempt(&p->dl, &curr->dl)) &&

	    (p->nr_cpus_allowed > 1)) {

	    (tsk_nr_cpus_allowed(p) > 1)) {

		int target = find_later_rq(p);



		if (target != -1 &&
@@ -1063,7 +1063,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) 
	 * Current can't be migrated, useless to reschedule,

	 * let's hope p can move out.

	 */

	if (rq->curr->nr_cpus_allowed == 1 ||

	if (tsk_nr_cpus_allowed(rq->curr) == 1 ||

	    cpudl_find(&rq->rd->cpudl, rq->curr, NULL) == -1)

		return;
@@ -1071,7 +1071,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) 
	 * p is migratable, so let's not schedule it and

	 * see if it is pushed or pulled somewhere else.

	 */

	if (p->nr_cpus_allowed != 1 &&

	if (tsk_nr_cpus_allowed(p) != 1 &&

	    cpudl_find(&rq->rd->cpudl, p, NULL) != -1)

		return;
@@ -1186,7 +1186,7 @@ static void put_prev_task_dl(struct rq *rq, struct task_struct *p) 
{

	update_curr_dl(rq);



	if (on_dl_rq(&p->dl) && p->nr_cpus_allowed > 1)

	if (on_dl_rq(&p->dl) && tsk_nr_cpus_allowed(p) > 1)

		enqueue_pushable_dl_task(rq, p);

}
@@ -1287,7 +1287,7 @@ static int find_later_rq(struct task_struct *task) 
	if (unlikely(!later_mask))

		return -1;



	if (task->nr_cpus_allowed == 1)

	if (tsk_nr_cpus_allowed(task) == 1)

		return -1;



	/*
@@ -1433,7 +1433,7 @@ static struct task_struct *pick_next_pushable_dl_task(struct rq *rq) 


	BUG_ON(rq->cpu != task_cpu(p));

	BUG_ON(task_current(rq, p));

	BUG_ON(p->nr_cpus_allowed <= 1);

	BUG_ON(tsk_nr_cpus_allowed(p) <= 1);



	BUG_ON(!task_on_rq_queued(p));

	BUG_ON(!dl_task(p));
@@ -1472,7 +1472,7 @@ static int push_dl_task(struct rq *rq) 
	 */

	if (dl_task(rq->curr) &&

	    dl_time_before(next_task->dl.deadline, rq->curr->dl.deadline) &&

	    rq->curr->nr_cpus_allowed > 1) {

	    tsk_nr_cpus_allowed(rq->curr) > 1) {

		resched_curr(rq);

		return 0;

	}
@@ -1619,9 +1619,9 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p) 
{

	if (!task_running(rq, p) &&

	    !test_tsk_need_resched(rq->curr) &&

	    p->nr_cpus_allowed > 1 &&

	    tsk_nr_cpus_allowed(p) > 1 &&

	    dl_task(rq->curr) &&

	    (rq->curr->nr_cpus_allowed < 2 ||

	    (tsk_nr_cpus_allowed(rq->curr) < 2 ||

	     !dl_entity_preempt(&p->dl, &rq->curr->dl))) {

		push_dl_tasks(rq);

	}
@@ -1725,7 +1725,7 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p) 


	if (task_on_rq_queued(p) && rq->curr != p) {

#ifdef CONFIG_SMP

		if (p->nr_cpus_allowed > 1 && rq->dl.overloaded)

		if (tsk_nr_cpus_allowed(p) > 1 && rq->dl.overloaded)

			queue_push_tasks(rq);

#else

		if (dl_task(rq->curr))

kernel/sched/rt.c

+12 −12
Original line number Diff line number Diff line
@@ -334,7 +334,7 @@ static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) 
	rt_rq = &rq_of_rt_rq(rt_rq)->rt;



	rt_rq->rt_nr_total++;

	if (p->nr_cpus_allowed > 1)

	if (tsk_nr_cpus_allowed(p) > 1)

		rt_rq->rt_nr_migratory++;



	update_rt_migration(rt_rq);
@@ -351,7 +351,7 @@ static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) 
	rt_rq = &rq_of_rt_rq(rt_rq)->rt;



	rt_rq->rt_nr_total--;

	if (p->nr_cpus_allowed > 1)

	if (tsk_nr_cpus_allowed(p) > 1)

		rt_rq->rt_nr_migratory--;



	update_rt_migration(rt_rq);
@@ -1324,7 +1324,7 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags) 


	enqueue_rt_entity(rt_se, flags);



	if (!task_current(rq, p) && p->nr_cpus_allowed > 1)

	if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1)

		enqueue_pushable_task(rq, p);

}
@@ -1413,7 +1413,7 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags) 
	 * will have to sort it out.

	 */

	if (curr && unlikely(rt_task(curr)) &&

	    (curr->nr_cpus_allowed < 2 ||

	    (tsk_nr_cpus_allowed(curr) < 2 ||

	     curr->prio <= p->prio)) {

		int target = find_lowest_rq(p);
@@ -1437,7 +1437,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p) 
	 * Current can't be migrated, useless to reschedule,

	 * let's hope p can move out.

	 */

	if (rq->curr->nr_cpus_allowed == 1 ||

	if (tsk_nr_cpus_allowed(rq->curr) == 1 ||

	    !cpupri_find(&rq->rd->cpupri, rq->curr, NULL))

		return;
@@ -1445,7 +1445,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p) 
	 * p is migratable, so let's not schedule it and

	 * see if it is pushed or pulled somewhere else.

	 */

	if (p->nr_cpus_allowed != 1

	if (tsk_nr_cpus_allowed(p) != 1

	    && cpupri_find(&rq->rd->cpupri, p, NULL))

		return;
@@ -1579,7 +1579,7 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p) 
	 * The previous task needs to be made eligible for pushing

	 * if it is still active

	 */

	if (on_rt_rq(&p->rt) && p->nr_cpus_allowed > 1)

	if (on_rt_rq(&p->rt) && tsk_nr_cpus_allowed(p) > 1)

		enqueue_pushable_task(rq, p);

}
@@ -1629,7 +1629,7 @@ static int find_lowest_rq(struct task_struct *task) 
	if (unlikely(!lowest_mask))

		return -1;



	if (task->nr_cpus_allowed == 1)

	if (tsk_nr_cpus_allowed(task) == 1)

		return -1; /* No other targets possible */



	if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))
@@ -1762,7 +1762,7 @@ static struct task_struct *pick_next_pushable_task(struct rq *rq) 


	BUG_ON(rq->cpu != task_cpu(p));

	BUG_ON(task_current(rq, p));

	BUG_ON(p->nr_cpus_allowed <= 1);

	BUG_ON(tsk_nr_cpus_allowed(p) <= 1);



	BUG_ON(!task_on_rq_queued(p));

	BUG_ON(!rt_task(p));
@@ -2122,9 +2122,9 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p) 
{

	if (!task_running(rq, p) &&

	    !test_tsk_need_resched(rq->curr) &&

	    p->nr_cpus_allowed > 1 &&

	    tsk_nr_cpus_allowed(p) > 1 &&

	    (dl_task(rq->curr) || rt_task(rq->curr)) &&

	    (rq->curr->nr_cpus_allowed < 2 ||

	    (tsk_nr_cpus_allowed(rq->curr) < 2 ||

	     rq->curr->prio <= p->prio))

		push_rt_tasks(rq);

}
@@ -2197,7 +2197,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) 
	 */

	if (task_on_rq_queued(p) && rq->curr != p) {

#ifdef CONFIG_SMP

		if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)

		if (tsk_nr_cpus_allowed(p) > 1 && rq->rt.overloaded)

			queue_push_tasks(rq);

#else

		if (p->prio < rq->curr->prio)