sched: fair-group: de-couple load-balancing from the rb-trees

De-couple load-balancing from the rb-trees, so that I can change their
organization.

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

1 files changed, 13 insertions, 8 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 9e301a2bab6f..ed8ce329899b 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -533,6 +533,7 @@ account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
                 add_cfs_task_weight(cfs_rq, se->load.weight);
         cfs_rq->nr_running++;
         se->on_rq = 1;
+        list_add(&se->group_node, &cfs_rq->tasks);
 }
 
 static void
@@ -545,6 +546,7 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
                 add_cfs_task_weight(cfs_rq, -se->load.weight);
         cfs_rq->nr_running--;
         se->on_rq = 0;
+        list_del_init(&se->group_node);
 }
 
 static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -1289,21 +1291,24 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
  * the current task:
  */
 static struct task_struct *
-__load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr)
+__load_balance_iterator(struct cfs_rq *cfs_rq, struct list_head *next)
 {
         struct task_struct *p = NULL;
         struct sched_entity *se;
 
-        if (!curr)
+        if (next == &cfs_rq->tasks)
                 return NULL;
 
         /* Skip over entities that are not tasks */
         do {
-                se = rb_entry(curr, struct sched_entity, run_node);
-                curr = rb_next(curr);
-        } while (curr && !entity_is_task(se));
+                se = list_entry(next, struct sched_entity, group_node);
+                next = next->next;
+        } while (next != &cfs_rq->tasks && !entity_is_task(se));
 
-        cfs_rq->rb_load_balance_curr = curr;
+        if (next == &cfs_rq->tasks)
+                return NULL;
+
+        cfs_rq->balance_iterator = next;
 
         if (entity_is_task(se))
                 p = task_of(se);
@@ -1315,14 +1320,14 @@ static struct task_struct *load_balance_start_fair(void *arg)
 {
         struct cfs_rq *cfs_rq = arg;
 
-        return __load_balance_iterator(cfs_rq, first_fair(cfs_rq));
+        return __load_balance_iterator(cfs_rq, cfs_rq->tasks.next);
 }
 
 static struct task_struct *load_balance_next_fair(void *arg)
 {
         struct cfs_rq *cfs_rq = arg;
 
-        return __load_balance_iterator(cfs_rq, cfs_rq->rb_load_balance_curr);
+        return __load_balance_iterator(cfs_rq, cfs_rq->balance_iterator);
 }
 
 static unsigned long