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sched/{rt,deadline}: Fix set_next_task vs pick_next_task 

Because pick_next_task() implies set_curr_task() and some of the
details haven't mattered too much, some of what _should_ be in
set_curr_task() ended up in pick_next_task, correct this.

This prepares the way for a pick_next_task() variant that does not
affect the current state; allowing remote picking.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Lu <aaron.lwe@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: mingo@kernel.org
Cc: Phil Auld <pauld@redhat.com>
Cc: Julien Desfossez <jdesfossez@digitalocean.com>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>
Link: https://lkml.kernel.org/r/38c61d5240553e043c27c5e00b9dd0d184dd6081.1559129225.git.vpillai@digitalocean.com
This commit is contained in:
Peter Zijlstra 2019-05-29 20:36:40 +00:00
parent 5feeb7837a
commit f95d4eaee6
2 changed files with 24 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
kernel/sched/deadline.c
View File

@ -1727,12 +1727,20 @@ static void start_hrtick_dl(struct rq *rq, struct task_struct *p)
}
#endif
static inline void set_next_task(struct rq *rq, struct task_struct *p)
static void set_next_task_dl(struct rq *rq, struct task_struct *p)
{
p->se.exec_start = rq_clock_task(rq);
/* You can't push away the running task */
dequeue_pushable_dl_task(rq, p);
if (hrtick_enabled(rq))
start_hrtick_dl(rq, p);
if (rq->curr->sched_class != &dl_sched_class)
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, 0);
deadline_queue_push_tasks(rq);
}
static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
@ -1791,15 +1799,7 @@ pick_next_task_dl(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
p = dl_task_of(dl_se);
set_next_task(rq, p);
if (hrtick_enabled(rq))
start_hrtick_dl(rq, p);
deadline_queue_push_tasks(rq);
if (rq->curr->sched_class != &dl_sched_class)
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, 0);
set_next_task_dl(rq, p);
return p;
}
@ -1846,7 +1846,7 @@ static void task_fork_dl(struct task_struct *p)
static void set_curr_task_dl(struct rq *rq)
{
set_next_task(rq, rq->curr);
set_next_task_dl(rq, rq->curr);
}
#ifdef CONFIG_SMP

26
kernel/sched/rt.c
View File

@ -1498,12 +1498,22 @@ static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int flag
#endif
}
static inline void set_next_task(struct rq *rq, struct task_struct *p)
static inline void set_next_task_rt(struct rq *rq, struct task_struct *p)
{
p->se.exec_start = rq_clock_task(rq);
/* The running task is never eligible for pushing */
dequeue_pushable_task(rq, p);
/*
* If prev task was rt, put_prev_task() has already updated the
* utilization. We only care of the case where we start to schedule a
* rt task
*/
if (rq->curr->sched_class != &rt_sched_class)
update_rt_rq_load_avg(rq_clock_pelt(rq), rq, 0);
rt_queue_push_tasks(rq);
}
static struct sched_rt_entity *pick_next_rt_entity(struct rq *rq,
@ -1577,17 +1587,7 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
p = _pick_next_task_rt(rq);
set_next_task(rq, p);
rt_queue_push_tasks(rq);
/*
* If prev task was rt, put_prev_task() has already updated the
* utilization. We only care of the case where we start to schedule a
* rt task
*/
if (rq->curr->sched_class != &rt_sched_class)
update_rt_rq_load_avg(rq_clock_pelt(rq), rq, 0);
set_next_task_rt(rq, p);
return p;
}
@ -2356,7 +2356,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
static void set_curr_task_rt(struct rq *rq)
{
set_next_task(rq, rq->curr);
set_next_task_rt(rq, rq->curr);
}
static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task)