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>

1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index b7dff36c7c8c..0bd8f2c0fb40 100644
--- 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)