[PATCH] improve scheduler fairness a bit

Do not transfer remaining time slice to another cpu on process exit.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/sched.c b/kernel/sched.c
index 340dd238c16da8044acf88527e3c07feb9472c20..b4f4eb6135372d258d51ded475ff68c5517c2614 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1468,7 +1468,7 @@ void fastcall sched_exit(task_t *p)
         * the sleep_avg of the parent as well.
         */
        rq = task_rq_lock(p->parent, &flags);
-       if (p->first_time_slice) {
+       if (p->first_time_slice && task_cpu(p) == task_cpu(p->parent)) {
                p->parent->time_slice += p->time_slice;
                if (unlikely(p->parent->time_slice > task_timeslice(p)))
                        p->parent->time_slice = task_timeslice(p);