sched: remove SCHED_FEAT_SKIP_INITIAL

remove SCHED_FEAT_SKIP_INITIAL - it was off by default and even
when enabled it never made any real difference.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

kernel/sched.c

@@ -399,7 +399,6 @@ enum {
 	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 =
@@ -407,8 +406,7 @@ const_debug unsigned int sysctl_sched_features =
 		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;
+		SCHED_FEAT_START_DEBIT		*1;
 
 #define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
 

kernel/sched_fair.c

@@ -1063,13 +1063,6 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
 	update_curr(cfs_rq);
 	place_entity(cfs_rq, se, 1);
 
-	/*
-	 * The first wait is dominated by the child-runs-first logic,
-	 * so do not credit it with that waiting time yet:
-	 */
-	if (sched_feat(SKIP_INITIAL))
-		se->wait_start_fair = 0;
-
 	/*
 	 * The statistical average of wait_runtime is about
 	 * -granularity/2, so initialize the task with that: