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Commit 9a778300 authored by Morten Rasmussen's avatar Morten Rasmussen Committed by Chris Redpath
Browse files

ANDROID: sched: Highest energy aware balancing sched_domain level pointer 



Add another member to the family of per-cpu sched_domain shortcut
pointers. This one, sd_ea, points to the highest level at which energy
model is provided. At this level and all levels below all sched_groups
have energy model data attached.

Partial energy model information is possible but restricted to providing
energy model data for lower level sched_domains (sd_ea and below) and
leaving load-balancing on levels above to non-energy-aware
load-balancing. For example, it is possible to apply energy-aware
scheduling within each socket on a multi-socket system and let normal
scheduling handle load-balancing between sockets.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarMorten Rasmussen <morten.rasmussen@arm.com>
Change-Id: Ie9ff4dc97b4fda3292ce58c22f1032cd3085529c
Signed-off-by: default avatarChris Redpath <chris.redpath@arm.com>
parent 29231563

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -1057,6 +1057,7 @@ DECLARE_PER_CPU(int, sd_llc_id); 
DECLARE_PER_CPU(struct sched_domain_shared *, sd_llc_shared);

DECLARE_PER_CPU(struct sched_domain *, sd_numa);

DECLARE_PER_CPU(struct sched_domain *, sd_asym);

DECLARE_PER_CPU(struct sched_domain *, sd_ea);



struct sched_group_capacity {

	atomic_t ref;

kernel/sched/topology.c

+10 −0
Original line number Diff line number Diff line
@@ -393,11 +393,13 @@ DEFINE_PER_CPU(int, sd_llc_id); 
DEFINE_PER_CPU(struct sched_domain_shared *, sd_llc_shared);

DEFINE_PER_CPU(struct sched_domain *, sd_numa);

DEFINE_PER_CPU(struct sched_domain *, sd_asym);

DEFINE_PER_CPU(struct sched_domain *, sd_ea);



static void update_top_cache_domain(int cpu)

{

	struct sched_domain_shared *sds = NULL;

	struct sched_domain *sd;

	struct sched_domain *ea_sd = NULL;

	int id = cpu;

	int size = 1;
@@ -418,6 +420,14 @@ static void update_top_cache_domain(int cpu) 


	sd = highest_flag_domain(cpu, SD_ASYM_PACKING);

	rcu_assign_pointer(per_cpu(sd_asym, cpu), sd);



	for_each_domain(cpu, sd) {

		if (sd->groups->sge)

			ea_sd = sd;

		else

			break;

	}

	rcu_assign_pointer(per_cpu(sd_ea, cpu), ea_sd);

}



/*