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sched: Wrap scheduler p->cpus_allowed access 

This task is preparatory for the migrate_disable() implementation, but
stands on its own and provides a cleanup.

It currently only converts those sites required for task-placement.
Kosaki-san once mentioned replacing cpus_allowed with a proper
cpumask_t instead of the NR_CPUS sized array it currently is, that
would also require something like this.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Link: http://lkml.kernel.org/n/tip-e42skvaddos99psip0vce41o@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-06-16 12:23:22 +02:00 committed by Ingo Molnar
parent 6eb57e0d65
commit fa17b507f1
4 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
kernel/sched.c
View File

@ -2544,11 +2544,11 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
/* Look for allowed, online CPU in same node. */
for_each_cpu_and(dest_cpu, nodemask, cpu_active_mask)
if (cpumask_test_cpu(dest_cpu, &p->cpus_allowed))
if (cpumask_test_cpu(dest_cpu, tsk_cpus_allowed(p)))
return dest_cpu;
/* Any allowed, online CPU? */
dest_cpu = cpumask_any_and(&p->cpus_allowed, cpu_active_mask);
dest_cpu = cpumask_any_and(tsk_cpus_allowed(p), cpu_active_mask);
if (dest_cpu < nr_cpu_ids)
return dest_cpu;
@ -2585,7 +2585,7 @@ int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
* [ this allows ->select_task() to simply return task_cpu(p) and
* not worry about this generic constraint ]
*/
if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
if (unlikely(!cpumask_test_cpu(cpu, tsk_cpus_allowed(p)) ||
!cpu_online(cpu)))
cpu = select_fallback_rq(task_cpu(p), p);
@ -6262,7 +6262,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
if (task_cpu(p) != src_cpu)
goto done;
/* Affinity changed (again). */
if (!cpumask_test_cpu(dest_cpu, &p->cpus_allowed))
if (!cpumask_test_cpu(dest_cpu, tsk_cpus_allowed(p)))
goto fail;
/*

12
kernel/sched_fair.c
View File

@ -2183,7 +2183,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
/* Skip over this group if it has no CPUs allowed */
if (!cpumask_intersects(sched_group_cpus(group),
&p->cpus_allowed))
tsk_cpus_allowed(p)))
continue;
local_group = cpumask_test_cpu(this_cpu,
@ -2229,7 +2229,7 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
int i;
/* Traverse only the allowed CPUs */
for_each_cpu_and(i, sched_group_cpus(group), &p->cpus_allowed) {
for_each_cpu_and(i, sched_group_cpus(group), tsk_cpus_allowed(p)) {
load = weighted_cpuload(i);
if (load < min_load || (load == min_load && i == this_cpu)) {
@ -2273,7 +2273,7 @@ static int select_idle_sibling(struct task_struct *p, int target)
if (!(sd->flags & SD_SHARE_PKG_RESOURCES))
break;
for_each_cpu_and(i, sched_domain_span(sd), &p->cpus_allowed) {
for_each_cpu_and(i, sched_domain_span(sd), tsk_cpus_allowed(p)) {
if (idle_cpu(i)) {
target = i;
break;
@ -2316,7 +2316,7 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
int sync = wake_flags & WF_SYNC;
if (sd_flag & SD_BALANCE_WAKE) {
if (cpumask_test_cpu(cpu, &p->cpus_allowed))
if (cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))
want_affine = 1;
new_cpu = prev_cpu;
}
@ -2697,7 +2697,7 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
* 2) cannot be migrated to this CPU due to cpus_allowed, or
* 3) are cache-hot on their current CPU.
*/
if (!cpumask_test_cpu(this_cpu, &p->cpus_allowed)) {
if (!cpumask_test_cpu(this_cpu, tsk_cpus_allowed(p))) {
schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
return 0;
}
@ -4087,7 +4087,7 @@ redo:
* moved to this_cpu
*/
if (!cpumask_test_cpu(this_cpu,
&busiest->curr->cpus_allowed)) {
tsk_cpus_allowed(busiest->curr))) {
raw_spin_unlock_irqrestore(&busiest->lock,
flags);
all_pinned = 1;

4
kernel/sched_rt.c
View File

@ -1179,7 +1179,7 @@ static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
{
if (!task_running(rq, p) &&
(cpu < 0 || cpumask_test_cpu(cpu, &p->cpus_allowed)) &&
(cpu < 0 || cpumask_test_cpu(cpu, tsk_cpus_allowed(p))) &&
(p->rt.nr_cpus_allowed > 1))
return 1;
return 0;
@ -1324,7 +1324,7 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
*/
if (unlikely(task_rq(task) != rq ||
!cpumask_test_cpu(lowest_rq->cpu,
&task->cpus_allowed) ||
tsk_cpus_allowed(task)) ||
task_running(rq, task) ||
!task->on_rq)) {

2
lib/smp_processor_id.c
View File

@ -22,7 +22,7 @@ notrace unsigned int debug_smp_processor_id(void)
* Kernel threads bound to a single CPU can safely use
* smp_processor_id():
*/
if (cpumask_equal(&current->cpus_allowed, cpumask_of(this_cpu)))
if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu)))
goto out;
/*