diff -Naurp linux-2.6.0-test2-mm4/kernel/sched.c linux-2.6.0-test2-mm4-O12.3/kernel/sched.c
--- linux-2.6.0-test2-mm4/kernel/sched.c	2003-08-04 20:16:02.000000000 +1000
+++ linux-2.6.0-test2-mm4-O12.3/kernel/sched.c	2003-08-04 20:19:10.000000000 +1000
@@ -365,9 +365,6 @@ static void recalc_task_prio(task_t *p, 
 	unsigned long long __sleep_time = now - p->timestamp;
 	unsigned long sleep_time;
 
-	if (unlikely(!p->timestamp))
-		__sleep_time = 0;
-
 	if (__sleep_time > NS_MAX_SLEEP_AVG)
 		sleep_time = NS_MAX_SLEEP_AVG;
 	else
@@ -420,8 +417,7 @@ static void recalc_task_prio(task_t *p, 
 				p->interactive_credit++;
 			}
 		}
-	} else if (!p->sleep_avg)
-		p->interactive_credit--;
+	}
 
 	p->prio = effective_prio(p);
 }
@@ -454,9 +450,6 @@ static inline void activate_task(task_t 
 	 */
 		p->activated = 1;
 
-	if (unlikely(!p->timestamp))
-		p->activated = 0;
-
 	p->timestamp = now;
 
 	__activate_task(p, rq);
@@ -644,7 +637,6 @@ void wake_up_forked_process(task_t * p)
 	p->sleep_avg = JIFFIES_TO_NS(sleep_avg);
 
 	p->interactive_credit = 0;
-	p->timestamp = 0;
 
 	p->prio = effective_prio(p);
 	set_task_cpu(p, smp_processor_id());