[PATCH] SCHED: account_rt_tasks_in_prio_bias

[Con Kolivas]

On Mon, 23 May 2005 19:28, Con Kolivas wrote:
> On Sat, 21 May 2005 15:00, Con Kolivas wrote:
> > Ok I've respun the smp nice support for the cpu scheduler modifications
> > that are in current -mm. Tested on 2.6.12-rc4-mm2 on 4x and seems to work
> > fine.
>
> Thanks to Peter Williams for noting I should only change the prio_bias if
> the task is queued in set_user_nice.

And for completeness the effect of real time tasks' real time priority level 
should be considered in prio_bias instead of their nice level.

Con
---

Real time tasks' effect on prio_bias should be based on their real time
priority level instead of their static_prio which is based on nice.

Signed-off-by: Con Kolivas <kernel@xxxxxxxxxxx>

Index: linux-2.6.12-rc4-mm2/kernel/sched.c
===================================================================
--- linux-2.6.12-rc4-mm2.orig/kernel/sched.c	2005-05-23 19:23:10.000000000 +1000
+++ linux-2.6.12-rc4-mm2/kernel/sched.c	2005-05-23 19:59:45.000000000 +1000
@@ -659,21 +659,21 @@ static int effective_prio(task_t *p)
 }
 
 #ifdef CONFIG_SMP
-static inline void inc_prio_bias(runqueue_t *rq, int static_prio)
+static inline void inc_prio_bias(runqueue_t *rq, int prio)
 {
-	rq->prio_bias += MAX_PRIO - static_prio;
+	rq->prio_bias += MAX_PRIO - prio;
 }
 
-static inline void dec_prio_bias(runqueue_t *rq, int static_prio)
+static inline void dec_prio_bias(runqueue_t *rq, int prio)
 {
-	rq->prio_bias -= MAX_PRIO - static_prio;
+	rq->prio_bias -= MAX_PRIO - prio;
 }
 #else
-static inline void inc_prio_bias(runqueue_t *rq, int static_prio)
+static inline void inc_prio_bias(runqueue_t *rq, int prio)
 {
 }
 
-static inline void dec_prio_bias(runqueue_t *rq, int static_prio)
+static inline void dec_prio_bias(runqueue_t *rq, int prio)
 {
 }
 #endif
@@ -681,13 +681,19 @@ static inline void dec_prio_bias(runqueu
 static inline void inc_nr_running(task_t *p, runqueue_t *rq)
 {
 	rq->nr_running++;
-	inc_prio_bias(rq, p->static_prio);
+	if (rt_task(p))
+		inc_prio_bias(rq, p->prio);
+	else
+		inc_prio_bias(rq, p->static_prio);
 }
 
 static inline void dec_nr_running(task_t *p, runqueue_t *rq)
 {
 	rq->nr_running--;
-	dec_prio_bias(rq, p->static_prio);
+	if (rt_task(p))
+		dec_prio_bias(rq, p->prio);
+	else
+		dec_prio_bias(rq, p->static_prio);
 }
 
 /*

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