[GIT pull] sched/urgent for 5.3-rc4

[Thomas Gleixner]

Linus,

please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
sched-urgent-for-linus

up to:  04e048cf09d7: sched/psi: Do not require setsched permission from the 
trigger creator

Three fixlets for the scheduler:

 - Avoid double bandwidth accounting in the push & pull code

 - Use a sane FIFO priority for the Pressure Stall Information (PSI) thread.
 
 - Avoid permission checks when setting the scheduler params for the PSI thread

Thanks,

        tglx

------------------>
Dietmar Eggemann (1):
      sched/deadline: Fix double accounting of rq/running bw in push & pull

Peter Zijlstra (1):
      sched/psi: Reduce psimon FIFO priority

Suren Baghdasaryan (1):
      sched/psi: Do not require setsched permission from the trigger creator


 kernel/sched/deadline.c | 8 --------
 kernel/sched/psi.c      | 4 ++--
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index ef5b9f6b1d42..46122edd8552 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2088,17 +2088,13 @@ static int push_dl_task(struct rq *rq)
        }
 
        deactivate_task(rq, next_task, 0);
-       sub_running_bw(&next_task->dl, &rq->dl);
-       sub_rq_bw(&next_task->dl, &rq->dl);
        set_task_cpu(next_task, later_rq->cpu);
-       add_rq_bw(&next_task->dl, &later_rq->dl);
 
        /*
         * Update the later_rq clock here, because the clock is used
         * by the cpufreq_update_util() inside __add_running_bw().
         */
        update_rq_clock(later_rq);
-       add_running_bw(&next_task->dl, &later_rq->dl);
        activate_task(later_rq, next_task, ENQUEUE_NOCLOCK);
        ret = 1;
 
@@ -2186,11 +2182,7 @@ static void pull_dl_task(struct rq *this_rq)
                        resched = true;
 
                        deactivate_task(src_rq, p, 0);
-                       sub_running_bw(&p->dl, &src_rq->dl);
-                       sub_rq_bw(&p->dl, &src_rq->dl);
                        set_task_cpu(p, this_cpu);
-                       add_rq_bw(&p->dl, &this_rq->dl);
-                       add_running_bw(&p->dl, &this_rq->dl);
                        activate_task(this_rq, p, 0);
                        dmin = p->dl.deadline;
 
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 7acc632c3b82..23fbbcc414d5 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1051,7 +1051,7 @@ struct psi_trigger *psi_trigger_create(struct psi_group 
*group,
 
        if (!rcu_access_pointer(group->poll_kworker)) {
                struct sched_param param = {
-                       .sched_priority = MAX_RT_PRIO - 1,
+                       .sched_priority = 1,
                };
                struct kthread_worker *kworker;
 
@@ -1061,7 +1061,7 @@ struct psi_trigger *psi_trigger_create(struct psi_group 
*group,
                        mutex_unlock(&group->trigger_lock);
                        return ERR_CAST(kworker);
                }
-               sched_setscheduler(kworker->task, SCHED_FIFO, &param);
+               sched_setscheduler_nocheck(kworker->task, SCHED_FIFO, &param);
                kthread_init_delayed_work(&group->poll_work,
                                psi_poll_work);
                rcu_assign_pointer(group->poll_kworker, kworker);