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Commit ff198e03 authored by Olav Haugan's avatar Olav Haugan
Browse files

sched/core: Add API to set cluster d-state 



Add new API to the scheduler to allow low power mode driver to inform
the scheduler about the d-state of a cluster. This can be leveraged by
the scheduler to make an informed decision about the cost of placing a task
on a cluster.

Change-Id: If0fe0fdba7acad1c2eb73654ebccfdb421225e62
Signed-off-by: default avatarOlav Haugan <ohaugan@codeaurora.org>
parent c8df36dc

include/linux/sched.h

+7 −0
Original line number Diff line number Diff line
@@ -2162,6 +2162,8 @@ extern int set_cpus_allowed_ptr(struct task_struct *p, 
				const struct cpumask *new_mask);

extern void sched_set_cpu_cstate(int cpu, int cstate,

			 int wakeup_energy, int wakeup_latency);

extern void sched_set_cluster_dstate(const cpumask_t *cluster_cpus, int dstate,

				int wakeup_energy, int wakeup_latency);

#else

static inline void do_set_cpus_allowed(struct task_struct *p,

				      const struct cpumask *new_mask)
@@ -2178,6 +2180,11 @@ static inline void 
sched_set_cpu_cstate(int cpu, int cstate, int wakeup_energy, int wakeup_latency)

{

}



static inline void sched_set_cluster_dstate(const cpumask_t *cluster_cpus,

			int dstate, int wakeup_energy, int wakeup_latency)

{

}

#endif



extern int sched_set_wake_up_idle(struct task_struct *p, int wake_up_idle);

kernel/sched/core.c

+27 −0
Original line number Diff line number Diff line
@@ -800,6 +800,29 @@ sched_set_cpu_cstate(int cpu, int cstate, int wakeup_energy, int wakeup_latency) 
	rq->wakeup_energy = wakeup_energy;

	rq->wakeup_latency = wakeup_latency;

}



/*

 * Note D-state for (idle) cluster.

 *

 * @dstate = dstate index, 0 -> active state

 * @wakeup_energy = energy spent in waking up cluster

 * @wakeup_latency = latency to wakeup from cluster

 *

 */

void sched_set_cluster_dstate(const cpumask_t *cluster_cpus, int dstate,

			int wakeup_energy, int wakeup_latency)

{

	int cpu;



	for_each_cpu(cpu, cluster_cpus) {

		struct rq *rq = cpu_rq(cpu);



		rq->dstate = dstate;

		rq->dstate_wakeup_energy = wakeup_energy;

		rq->dstate_wakeup_latency = wakeup_latency;

	}

}



#endif /* CONFIG_SMP */



#if defined(CONFIG_RT_GROUP_SCHED) || (defined(CONFIG_FAIR_GROUP_SCHED) && \
@@ -9020,6 +9043,10 @@ void __init sched_init(void) 
		rq->cstate = 0;

		rq->wakeup_latency = 0;



		rq->dstate = 0;

		rq->dstate_wakeup_latency = 0;

		rq->dstate_wakeup_energy = 0;



		INIT_LIST_HEAD(&rq->cfs_tasks);



		rq_attach_root(rq, &def_root_domain);

kernel/sched/qhmp_core.c

+27 −0
Original line number Diff line number Diff line
@@ -800,6 +800,29 @@ sched_set_cpu_cstate(int cpu, int cstate, int wakeup_energy, int wakeup_latency) 
	rq->wakeup_energy = wakeup_energy;

	rq->wakeup_latency = wakeup_latency;

}



/*

 * Note D-state for (idle) cluster.

 *

 * @dstate = dstate index, 0 -> active state

 * @wakeup_energy = energy spent in waking up cluster

 * @wakeup_latency = latency to wakeup from cluster

 *

 */

void sched_set_cluster_dstate(const cpumask_t *cluster_cpus, int dstate,

			int wakeup_energy, int wakeup_latency)

{

	int cpu;



	for_each_cpu(cpu, cluster_cpus) {

		struct rq *rq = cpu_rq(cpu);



		rq->dstate = dstate;

		rq->dstate_wakeup_energy = wakeup_energy;

		rq->dstate_wakeup_latency = wakeup_latency;

	}

}



#endif /* CONFIG_SMP */



#if defined(CONFIG_RT_GROUP_SCHED) || (defined(CONFIG_FAIR_GROUP_SCHED) && \
@@ -8953,6 +8976,10 @@ void __init sched_init(void) 
		rq->cstate = 0;

		rq->wakeup_latency = 0;



		rq->dstate = 0;

		rq->dstate_wakeup_latency = 0;

		rq->dstate_wakeup_energy = 0;



		INIT_LIST_HEAD(&rq->cfs_tasks);



		rq_attach_root(rq, &def_root_domain);

kernel/sched/qhmp_sched.h

+1 −0
Original line number Diff line number Diff line
@@ -617,6 +617,7 @@ struct rq { 
	u64 idle_stamp;

	u64 avg_idle;

	int cstate, wakeup_latency, wakeup_energy;

	int dstate, dstate_wakeup_latency, dstate_wakeup_energy;



	/* This is used to determine avg_idle's max value */

	u64 max_idle_balance_cost;

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -626,6 +626,7 @@ struct rq { 
	u64 idle_stamp;

	u64 avg_idle;

	int cstate, wakeup_latency, wakeup_energy;

	int dstate, dstate_wakeup_latency, dstate_wakeup_energy;



	/* This is used to determine avg_idle's max value */

	u64 max_idle_balance_cost;