linux-kernel - [RFC v5 3/6] sched/core: Update turbo

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Date:   Mon,  7 Oct 2019 14:00:48 +0530
From:   Parth Shah <parth@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, patrick.bellasi@...bug.net,
        valentin.schneider@....com, pavel@....cz, dsmythies@...us.net,
        quentin.perret@....com, rafael.j.wysocki@...el.com,
        tim.c.chen@...ux.intel.com, daniel.lezcano@...aro.org
Subject: [RFC v5 3/6] sched/core: Update turbo_sched count only when required

Use the get/put methods to add/remove the use of TurboSched support, such
that the feature is turned on only in the presence of atleast one
classified small bckground task.

Signed-off-by: Parth Shah <parth@...ux.ibm.com>
---
 kernel/sched/core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ee5980b4e150..6e1ae8046fe0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3141,6 +3141,9 @@ static struct rq *finish_task_switch(struct task_struct *prev)
 		mmdrop(mm);
 	}
 	if (unlikely(prev_state == TASK_DEAD)) {
+		if (unlikely(prev->flags & PF_CAN_BE_PACKED))
+			turbo_sched_put();
+
 		if (prev->sched_class->task_dead)
 			prev->sched_class->task_dead(prev);
 
@@ -4793,6 +4796,10 @@ static int __sched_setscheduler(struct task_struct *p,
 
 	prev_class = p->sched_class;
 
+	/* Refcount tasks classified as a small background task */
+	if (task_packing_flag != (p->flags & PF_CAN_BE_PACKED))
+		(task_packing_flag) ? turbo_sched_get() : turbo_sched_put();
+
 	__setscheduler(rq, p, attr, pi);
 	__setscheduler_uclamp(p, attr);
 
-- 
2.17.1