sched: remove precise CPU load

CPU load calculations are statistical anyway, and there's little benefit
from having it calculated on every scheduling event. So remove this code,
it gets rid of a divide from the scheduler wakeup and context-switch
fastpath.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 2138c40f4836..105d57b41aa2 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -94,16 +94,14 @@ enum {
         SCHED_FEAT_FAIR_SLEEPERS        = 1,
         SCHED_FEAT_SLEEPER_AVG          = 2,
         SCHED_FEAT_SLEEPER_LOAD_AVG     = 4,
-        SCHED_FEAT_PRECISE_CPU_LOAD     = 8,
-        SCHED_FEAT_START_DEBIT          = 16,
-        SCHED_FEAT_SKIP_INITIAL         = 32,
+        SCHED_FEAT_START_DEBIT          = 8,
+        SCHED_FEAT_SKIP_INITIAL         = 16,
 };
 
 const_debug unsigned int sysctl_sched_features =
                 SCHED_FEAT_FAIR_SLEEPERS        *1 |
                 SCHED_FEAT_SLEEPER_AVG          *0 |
                 SCHED_FEAT_SLEEPER_LOAD_AVG     *1 |
-                SCHED_FEAT_PRECISE_CPU_LOAD     *1 |
                 SCHED_FEAT_START_DEBIT          *1 |
                 SCHED_FEAT_SKIP_INITIAL         *0;