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sched: RT-balance, add new methods to sched_class

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Dmitry Adamushko found that the current implementation of the RT
balancing code left out changes to the sched_setscheduler and
rt_mutex_setprio.

This patch addresses this issue by adding methods to the schedule classes
to handle being switched out of (switched_from) and being switched into
(switched_to) a sched_class. Also a method for changing of priorities
is also added (prio_changed).

This patch also removes some duplicate logic between rt_mutex_setprio and
sched_setscheduler.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-01-25 21:08:22 +01:00
committed by Ingo Molnar
parent 9a897c5a67
commit cb46984504
5 changed files with 186 additions and 22 deletions
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31
kernel/sched_idletask.c
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@@ -69,6 +69,33 @@ static void set_curr_task_idle(struct rq *rq)
{
}
static void switched_to_idle(struct rq *rq, struct task_struct *p,
int running)
{
/* Can this actually happen?? */
if (running)
resched_task(rq->curr);
else
check_preempt_curr(rq, p);
}
static void prio_changed_idle(struct rq *rq, struct task_struct *p,
int oldprio, int running)
{
/* This can happen for hot plug CPUS */
/*
* Reschedule if we are currently running on this runqueue and
* our priority decreased, or if we are not currently running on
* this runqueue and our priority is higher than the current's
*/
if (running) {
if (p->prio > oldprio)
resched_task(rq->curr);
} else
check_preempt_curr(rq, p);
}
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
@@ -94,5 +121,9 @@ const struct sched_class idle_sched_class = {
.set_curr_task = set_curr_task_idle,
.task_tick = task_tick_idle,
.prio_changed = prio_changed_idle,
.switched_to = switched_to_idle,
/* no .task_new for idle tasks */
};