Re: [PATCH] Staircase scheduler v7.4

[Con Kolivas]

Ok I found a problem which alost certainly is responsible in the 
conversion from nanoseconds to Hz and may if you're unlucky give a blank 
timeslice. Can you try this (against staircase7.4). I'm almost certain 
it's responsbile. 

Cheers,
Con

P.S.
Sorry about all sorts of different ways I'm sending 
attachments. I'm away from home and use any email access I can find.--- linux-2.6.7-staircase7.4/kernel/sched.c	2004-06-27 20:13:52.990516660 +1000
+++ linux-2.6.7-staircase7.4-2/kernel/sched.c	2004-06-27 20:17:21.849580653 +1000
@@ -218,8 +218,8 @@ static void dequeue_task(struct task_str
 
 static void enqueue_task(struct task_struct *p, runqueue_t *rq)
 {
-	if (rq->curr->flags & PF_PREEMPTED) {
-		rq->curr->flags &= ~PF_PREEMPTED;
+	if (p->flags & PF_PREEMPTED) {
+		p->flags &= ~PF_PREEMPTED;
 		list_add(&p->run_list, rq->queue + p->prio);
 	} else
 		list_add_tail(&p->run_list, rq->queue + p->prio);
@@ -330,7 +330,7 @@ static void recalc_task_prio(task_t *p, 
 {
 	unsigned long sleep_time = now - p->timestamp;
 	unsigned long run_time = NS_TO_JIFFIES(p->runtime);
-	unsigned long total_run = NS_TO_JIFFIES(p->totalrun) + run_time;
+	unsigned long total_run = NS_TO_JIFFIES(p->totalrun + p->runtime);
 	if ((!run_time && NS_TO_JIFFIES(p->runtime + sleep_time) <
 		RR_INTERVAL) || p->flags & PF_FORKED) {
 			p->flags &= ~PF_FORKED;