sched: do not keep current in the tree and get rid of sched_entity::fair_key

Get rid of 'sched_entity::fair_key'.

As a side effect, 'current' is not kept withing the tree for 
SCHED_NORMAL/BATCH tasks anymore. This simplifies some parts of code 
(e.g. entity_tick() and yield_task_fair()) and also somewhat optimizes 
them (e.g. a single update_curr() now vs. dequeue/enqueue() before in 
entity_tick()).

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 572df1bbaeec..f776a30b403e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -891,7 +891,6 @@ struct load_weight {
  *     6 se->load.weight
  */
 struct sched_entity {
-        s64                     fair_key;
         struct load_weight      load;           /* for load-balancing */
         struct rb_node          run_node;
         unsigned int            on_rq;