[PATCH] sched: remove sleep_avg multiplier

Remove the sleep_avg multiplier.  This multiplier was necessary back when
we had 10 seconds of dynamic range in sleep_avg, but now that we only have
one second, it causes that one second to be compressed down to 100ms in
some cases.  This is particularly noticeable when compiling a kernel in a
slow NFS mount, and I believe it to be a very likely candidate for other
recently reported network related interactivity problems.

In testing, I can detect no negative impact of this removal.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 6 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 4d46e90f59c3..6b6e0d70eb30 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -707,12 +707,6 @@ static int recalc_task_prio(task_t *p, unsigned long long now)
                                                 DEF_TIMESLICE);
                 } else {
                         /*
-                         * The lower the sleep avg a task has the more
-                         * rapidly it will rise with sleep time.
-                         */
-                        sleep_time *= (MAX_BONUS - CURRENT_BONUS(p)) ? : 1;
-
-                        /*
                          * Tasks waking from uninterruptible sleep are
                          * limited in their sleep_avg rise as they
                          * are likely to be waiting on I/O