[patch] [sched] exit-penalty fix, 2.5.3-pre5

[Ingo Molnar]

the attached patch fixes the EXIT_WEIGHT code to only 'punish' tasks,
never reward them. (it would be a way too easy method to boost CPU hogs
unfairly via starting up bogus threads that exit() after a few seconds.)

	Ingo

diff -rNu linux/kernel/exit.c linux/kernel/exit.c
--- linux/kernel/exit.c	Mon Jan 28 15:23:50 2002
+++ linux/kernel/exit.c	Mon Jan 28 15:24:43 2002
@@ -59,8 +59,9 @@
 	current->time_slice += p->time_slice;
 	if (current->time_slice > MAX_TIMESLICE)
 		current->time_slice = MAX_TIMESLICE;
-	current->sleep_avg = (current->sleep_avg*EXIT_WEIGHT + p->sleep_avg) /
-					(EXIT_WEIGHT + 1);
+	if (p->sleep_avg < current->sleep_avg)
+		current->sleep_avg = (current->sleep_avg * EXIT_WEIGHT +
+				p->sleep_avg) / (EXIT_WEIGHT + 1);
 	__restore_flags(flags);

 	p->pid = 0;