1 files changed, 31 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 8f80ebafacc1..a5dd03522e32 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -382,6 +382,37 @@ static void update_rq_clock(struct rq *rq)
 #define cpu_curr(cpu)           (cpu_rq(cpu)->curr)
 
 /*
+ * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
+ */
+#ifdef CONFIG_SCHED_DEBUG
+# define const_debug __read_mostly
+#else
+# define const_debug static const
+#endif
+
+/*
+ * Debugging: various feature bits
+ */
+enum {
+        SCHED_FEAT_FAIR_SLEEPERS        = 1,
+        SCHED_FEAT_NEW_FAIR_SLEEPERS    = 2,
+        SCHED_FEAT_SLEEPER_AVG          = 4,
+        SCHED_FEAT_SLEEPER_LOAD_AVG     = 8,
+        SCHED_FEAT_START_DEBIT          = 16,
+        SCHED_FEAT_SKIP_INITIAL         = 32,
+};
+
+const_debug unsigned int sysctl_sched_features =
+                SCHED_FEAT_FAIR_SLEEPERS        *0 |
+                SCHED_FEAT_NEW_FAIR_SLEEPERS    *1 |
+                SCHED_FEAT_SLEEPER_AVG          *0 |
+                SCHED_FEAT_SLEEPER_LOAD_AVG     *1 |
+                SCHED_FEAT_START_DEBIT          *1 |
+                SCHED_FEAT_SKIP_INITIAL         *0;
+
+#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
+
+/*
  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
  * clock constructed from sched_clock():
  */