The idle task and stop task sched_classes return 0 in this function.
The single call site in sched_rr_get_interval() calls
p->sched_class->get_rr_interval() only conditional in case it is
defined. Otherwise time_slice=0 will be used.
The deadline sched class does not define it. Commit
a57beec5d427
("sched: Make sched_class::get_rr_interval() optional") introduced
the default time-slice=0 for sched classes which do not provide this
function.
So .get_rr_interval for idle and stop sched_class can be removed to
shrink the code a little.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200603080304.16548-4-dietmar.eggemann@arm.com
BUG();
}
-static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
-{
- return 0;
-}
-
static void update_curr_idle(struct rq *rq)
{
}
.task_tick = task_tick_idle,
- .get_rr_interval = get_rr_interval_idle,
-
.prio_changed = prio_changed_idle,
.switched_to = switched_to_idle,
.update_curr = update_curr_idle,
BUG(); /* how!?, what priority? */
}
-static unsigned int
-get_rr_interval_stop(struct rq *rq, struct task_struct *task)
-{
- return 0;
-}
-
static void update_curr_stop(struct rq *rq)
{
}
.task_tick = task_tick_stop,
- .get_rr_interval = get_rr_interval_stop,
-
.prio_changed = prio_changed_stop,
.switched_to = switched_to_stop,
.update_curr = update_curr_stop,