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authorSteven Rostedt <rostedt@goodmis.org>2008-01-25 21:08:22 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:22 +0100
commitcb46984504048db946cd551c261df4e70d59a8ea (patch)
treee07343cc5967f74370c6b0290b67a225d868a99d /kernel/sched_idletask.c
parent9a897c5a6701bcb6f099f7ca20194999102729fd (diff)
downloadlinux-cb46984504048db946cd551c261df4e70d59a8ea.tar.bz2
sched: RT-balance, add new methods to sched_class
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>
Diffstat (limited to 'kernel/sched_idletask.c')
-rw-r--r--kernel/sched_idletask.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index ca5374860aef..ef7a2661fa10 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -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 */
};