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/kernel/sched.c b/kernel/sched.c
index 6d1892192e21..3b104635a8ea 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6610,7 +6610,6 @@ void normalize_rt_tasks(void)
 
         read_lock_irq(&tasklist_lock);
         do_each_thread(g, p) {
-                p->se.fair_key                  = 0;
                 p->se.exec_start                = 0;
 #ifdef CONFIG_SCHEDSTATS
                 p->se.wait_start                = 0;