sched: cleanup old and rarely used 'debug' features.

TREE_AVG and APPROX_AVG are initial task placement policies that have been
disabled for a long while.. time to remove them.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index 3f7c5eb..366a909 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -594,18 +594,14 @@ enum {
        SCHED_FEAT_NEW_FAIR_SLEEPERS    = 1,
        SCHED_FEAT_WAKEUP_PREEMPT       = 2,
        SCHED_FEAT_START_DEBIT          = 4,
-       SCHED_FEAT_TREE_AVG             = 8,
-       SCHED_FEAT_APPROX_AVG           = 16,
-       SCHED_FEAT_HRTICK               = 32,
-       SCHED_FEAT_DOUBLE_TICK          = 64,
+       SCHED_FEAT_HRTICK               = 8,
+       SCHED_FEAT_DOUBLE_TICK          = 16,
 };
 
 const_debug unsigned int sysctl_sched_features =
                SCHED_FEAT_NEW_FAIR_SLEEPERS    * 1 |
                SCHED_FEAT_WAKEUP_PREEMPT       * 1 |
                SCHED_FEAT_START_DEBIT          * 1 |
-               SCHED_FEAT_TREE_AVG             * 0 |
-               SCHED_FEAT_APPROX_AVG           * 0 |
                SCHED_FEAT_HRTICK               * 1 |
                SCHED_FEAT_DOUBLE_TICK          * 0;
 

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index b85cac4..86a9337 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -302,11 +302,6 @@ static u64 __sched_vslice(unsigned long rq_weight, unsigned long nr_running)
        return vslice;
 }
 
-static u64 sched_vslice(struct cfs_rq *cfs_rq)
-{
-       return __sched_vslice(cfs_rq->load.weight, cfs_rq->nr_running);
-}
-
 static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
        return __sched_vslice(cfs_rq->load.weight + se->load.weight,
@@ -504,15 +499,6 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
        } else
                vruntime = cfs_rq->min_vruntime;
 
-       if (sched_feat(TREE_AVG)) {
-               struct sched_entity *last = __pick_last_entity(cfs_rq);
-               if (last) {
-                       vruntime += last->vruntime;
-                       vruntime >>= 1;
-               }
-       } else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running)
-               vruntime += sched_vslice(cfs_rq)/2;
-
        /*
         * The 'current' period is already promised to the current tasks,
         * however the extra weight of the new task will slow them down a