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Commit 94c4cea6 authored by Morten Rasmussen's avatar Morten Rasmussen Committed by Dmitry Shmidt
Browse files

ANDROID: sched: Make energy awareness a sched feature 



This patch introduces the ENERGY_AWARE sched feature, which is
implemented using jump labels when SCHED_DEBUG is defined. It is
statically set false when SCHED_DEBUG is not defined. Hence this doesn't
allow energy awareness to be enabled without SCHED_DEBUG. This
sched_feature knob will be replaced later with a more appropriate
control knob when things have matured a bit.

ENERGY_AWARE is based on per-entity load-tracking hence FAIR_GROUP_SCHED
must be enable. This dependency isn't checked at compile time yet.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarMorten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: default avatarAndres Oportus <andresoportus@google.com>
parent 577dacab

include/linux/sched.h

+19 −0
Original line number Diff line number Diff line
@@ -1067,6 +1067,22 @@ struct sched_domain_attr { 


extern int sched_domain_level_max;



struct capacity_state {

	unsigned long cap;	/* compute capacity */

	unsigned long power;	/* power consumption at this compute capacity */

};



struct idle_state {

	unsigned long power;	 /* power consumption in this idle state */

};



struct sched_group_energy {

	unsigned int nr_idle_states;	/* number of idle states */

	struct idle_state *idle_states;	/* ptr to idle state array */

	unsigned int nr_cap_states;	/* number of capacity states */

	struct capacity_state *cap_states; /* ptr to capacity state array */

};



struct sched_group;



struct sched_domain_shared {
@@ -1174,6 +1190,8 @@ bool cpus_share_cache(int this_cpu, int that_cpu); 


typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);

typedef int (*sched_domain_flags_f)(void);

typedef

const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu);



#define SDTL_OVERLAP	0x01
@@ -1187,6 +1205,7 @@ struct sd_data { 
struct sched_domain_topology_level {

	sched_domain_mask_f mask;

	sched_domain_flags_f sd_flags;

	sched_domain_energy_f energy;

	int		    flags;

	int		    numa_level;

	struct sd_data      data;

kernel/sched/fair.c

+5 −0
Original line number Diff line number Diff line
@@ -5104,6 +5104,11 @@ static void record_wakee(struct task_struct *p) 
	}

}



static inline bool energy_aware(void)

{

	return sched_feat(ENERGY_AWARE);

}



/*

 * Detect M:N waker/wakee relationships via a switching-frequency heuristic.

 *

kernel/sched/features.h

+5 −0
Original line number Diff line number Diff line
@@ -69,3 +69,8 @@ SCHED_FEAT(RT_RUNTIME_SHARE, true) 
SCHED_FEAT(LB_MIN, false)

SCHED_FEAT(ATTACH_AGE_LOAD, true)



/*

 * Energy aware scheduling. Use platform energy model to guide scheduling

 * decisions optimizing for energy efficiency.

 */

SCHED_FEAT(ENERGY_AWARE, false)

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -905,6 +905,7 @@ struct sched_group { 


	unsigned int group_weight;

	struct sched_group_capacity *sgc;

	const struct sched_group_energy const *sge;



	/*

	 * The CPUs this group covers.