sched: disable forced preemption by default

Implement feature bit to disable forced preemption. This way
it can be checked whether a workload is overscheduling or not.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index b7dff36..0bd8f2c 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -444,13 +444,15 @@ enum {
        SCHED_FEAT_START_DEBIT          = 2,
        SCHED_FEAT_TREE_AVG             = 4,
        SCHED_FEAT_APPROX_AVG           = 8,
+       SCHED_FEAT_WAKEUP_PREEMPT       = 16,
 };
 
 const_debug unsigned int sysctl_sched_features =
                SCHED_FEAT_NEW_FAIR_SLEEPERS    *1 |
                SCHED_FEAT_START_DEBIT          *1 |
                SCHED_FEAT_TREE_AVG             *0 |
-               SCHED_FEAT_APPROX_AVG           *0;
+               SCHED_FEAT_APPROX_AVG           *0 |
+               SCHED_FEAT_WAKEUP_PREEMPT       *1;
 
 #define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
 

diff --cc kernel/sched_fair.c
Simple merge