[RFCv3 3/8] sched/core: Update turbo_sched count only when required

[Parth Shah]

Use the get/put methods to add/remove the use of TurboSched support, such
that the feature is turned on only if there is atleast one jitter task.

Signed-off-by: Parth Shah <pa...@linux.ibm.com>
---
 kernel/sched/core.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ef83725bd4b0..c7b628d0be2b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1214,10 +1214,13 @@ static void __setscheduler_uclamp(struct task_struct *p,
                 * Set task to jitter class if Max util is clamped to the least
                 * possible value
                 */
-               if (p->uclamp_req[UCLAMP_MAX].bucket_id == 0 && !p->is_jitter)
+               if (p->uclamp_req[UCLAMP_MAX].bucket_id == 0 && !p->is_jitter) {
                        p->is_jitter = 1;
-               else if (p->is_jitter)
+                       turbo_sched_get();
+               } else if (p->is_jitter) {
                        p->is_jitter = 0;
+                       turbo_sched_put();
+               }
        }
 }
 
@@ -3215,6 +3218,9 @@ static struct rq *finish_task_switch(struct task_struct 
*prev)
                mmdrop(mm);
        }
        if (unlikely(prev_state == TASK_DEAD)) {
+               if (unlikely(prev->is_jitter))
+                       turbo_sched_put();
+
                if (prev->sched_class->task_dead)
                        prev->sched_class->task_dead(prev);
 
-- 
2.17.1