sched: Remove avg_wakeup

Testing the load which led to this heuristic (nfs4 kbuild) shows that it has
outlived it's usefullness.  With intervening load balancing changes, I cannot
see any difference with/without, so recover there fastpath cycles.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301062.6785.29.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 22 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 60b1bbe2ad1b..35a8626ace7d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1880,9 +1880,6 @@ static void update_avg(u64 *avg, u64 sample)
 static void
 enqueue_task(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 {
-        if (wakeup)
-                p->se.start_runtime = p->se.sum_exec_runtime;
-
         sched_info_queued(p);
         p->sched_class->enqueue_task(rq, p, wakeup, head);
         p->se.on_rq = 1;
@@ -1890,17 +1887,11 @@ enqueue_task(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 
 static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
 {
-        if (sleep) {
-                if (p->se.last_wakeup) {
-                        update_avg(&p->se.avg_overlap,
-                                p->se.sum_exec_runtime - p->se.last_wakeup);
-                        p->se.last_wakeup = 0;
-                } else {
-                        update_avg(&p->se.avg_wakeup,
-                                sysctl_sched_wakeup_granularity);
-                }
+        if (sleep && p->se.last_wakeup) {
+                update_avg(&p->se.avg_overlap,
+                        p->se.sum_exec_runtime - p->se.last_wakeup);
+                p->se.last_wakeup = 0;
         }
-
         sched_info_dequeued(p);
         p->sched_class->dequeue_task(rq, p, sleep);
         p->se.on_rq = 0;
@@ -2466,13 +2457,6 @@ out_activate:
          */
         if (!in_interrupt()) {
                 struct sched_entity *se = &current->se;
-                u64 sample = se->sum_exec_runtime;
-
-                if (se->last_wakeup)
-                        sample -= se->last_wakeup;
-                else
-                        sample -= se->start_runtime;
-                update_avg(&se->avg_wakeup, sample);
 
                 se->last_wakeup = se->sum_exec_runtime;
         }
@@ -2540,8 +2524,6 @@ static void __sched_fork(struct task_struct *p)
         p->se.nr_migrations             = 0;
         p->se.last_wakeup               = 0;
         p->se.avg_overlap               = 0;
-        p->se.start_runtime             = 0;
-        p->se.avg_wakeup                = sysctl_sched_wakeup_granularity;
 
 #ifdef CONFIG_SCHEDSTATS
         memset(&p->se.statistics, 0, sizeof(p->se.statistics));