sched: debug: fix cfs_rq->wait_runtime accounting

the cfs_rq->wait_runtime debug/statistics counter was not maintained
properly - fix this.

this also removes some code:

   text    data     bss     dec     hex filename
  13420     228    1204   14852    3a04 sched.o.before
  13404     228    1204   14836    39f4 sched.o.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

2 files changed, 5 insertions, 6 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index c8759ec6d8a9..97986f1f0be8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -858,7 +858,6 @@ static void dec_nr_running(struct task_struct *p, struct rq *rq)
 
 static void set_load_weight(struct task_struct *p)
 {
-        task_rq(p)->cfs.wait_runtime -= p->se.wait_runtime;
         p->se.wait_runtime = 0;
 
         if (task_has_rt_policy(p)) {
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 810b52d994e0..bac2aff8273c 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -194,6 +194,8 @@ __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
         update_load_add(&cfs_rq->load, se->load.weight);
         cfs_rq->nr_running++;
         se->on_rq = 1;
+
+        schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);
 }
 
 static inline void
@@ -205,6 +207,8 @@ __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
         update_load_sub(&cfs_rq->load, se->load.weight);
         cfs_rq->nr_running--;
         se->on_rq = 0;
+
+        schedstat_add(cfs_rq, wait_runtime, -se->wait_runtime);
 }
 
 static inline struct rb_node *first_fair(struct cfs_rq *cfs_rq)
@@ -574,7 +578,6 @@ static void __enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 
         prev_runtime = se->wait_runtime;
         __add_wait_runtime(cfs_rq, se, delta_fair);
-        schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);
         delta_fair = se->wait_runtime - prev_runtime;
 
         /*
@@ -662,7 +665,6 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
                         if (tsk->state & TASK_UNINTERRUPTIBLE)
                                 se->block_start = rq_of(cfs_rq)->clock;
                 }
-                cfs_rq->wait_runtime -= se->wait_runtime;
 #endif
         }
         __dequeue_entity(cfs_rq, se);
@@ -1121,10 +1123,8 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
          * The statistical average of wait_runtime is about
          * -granularity/2, so initialize the task with that:
          */
-        if (sysctl_sched_features & SCHED_FEAT_START_DEBIT) {
+        if (sysctl_sched_features & SCHED_FEAT_START_DEBIT)
                 se->wait_runtime = -(sched_granularity(cfs_rq) / 2);
-                schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);
-        }
 
         __enqueue_entity(cfs_rq, se);
 }