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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull scheduler fixes from Ingo Molnar:
 "A cputime fix and code comments/organization fix to the deadline
  scheduler"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/deadline: Fix confusing comments about selection of top pi-waiter
  sched/cputime: Don't use smp_processor_id() in preemptible context
This commit is contained in:
Linus Torvalds 2017-07-21 11:16:12 -07:00
parent bbcdea658f 193be41e33
commit 5a77f0254b
2 changed files with 11 additions and 9 deletions
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6
kernel/sched/cputime.c
View File

@ -683,7 +683,7 @@ static u64 vtime_delta(struct vtime *vtime)
{
unsigned long long clock;
clock = sched_clock_cpu(smp_processor_id());
clock = sched_clock();
if (clock < vtime->starttime)
return 0;
@ -814,7 +814,7 @@ void arch_vtime_task_switch(struct task_struct *prev)
write_seqcount_begin(&vtime->seqcount);
vtime->state = VTIME_SYS;
vtime->starttime = sched_clock_cpu(smp_processor_id());
vtime->starttime = sched_clock();
write_seqcount_end(&vtime->seqcount);
}
@ -826,7 +826,7 @@ void vtime_init_idle(struct task_struct *t, int cpu)
local_irq_save(flags);
write_seqcount_begin(&vtime->seqcount);
vtime->state = VTIME_SYS;
vtime->starttime = sched_clock_cpu(cpu);
vtime->starttime = sched_clock();
write_seqcount_end(&vtime->seqcount);
local_irq_restore(flags);
}

14
kernel/sched/deadline.c
View File

@ -1392,17 +1392,19 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags)
struct sched_dl_entity *pi_se = &p->dl;
/*
* Use the scheduling parameters of the top pi-waiter
* task if we have one and its (absolute) deadline is
* smaller than our one... OTW we keep our runtime and
* deadline.
* Use the scheduling parameters of the top pi-waiter task if:
* - we have a top pi-waiter which is a SCHED_DEADLINE task AND
* - our dl_boosted is set (i.e. the pi-waiter's (absolute) deadline is
* smaller than our deadline OR we are a !SCHED_DEADLINE task getting
* boosted due to a SCHED_DEADLINE pi-waiter).
* Otherwise we keep our runtime and deadline.
*/
if (pi_task && p->dl.dl_boosted && dl_prio(pi_task->normal_prio)) {
if (pi_task && dl_prio(pi_task->normal_prio) && p->dl.dl_boosted) {
pi_se = &pi_task->dl;
} else if (!dl_prio(p->normal_prio)) {
/*
* Special case in which we have a !SCHED_DEADLINE task
* that is going to be deboosted, but exceedes its
* that is going to be deboosted, but exceeds its
* runtime while doing so. No point in replenishing
* it, as it's going to return back to its original
* scheduling class after this.