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ANDROID: sched: Highest energy aware balancing sched_domain level pointer

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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: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Andres Oportus <andresoportus@google.com>
This commit is contained in:
Morten Rasmussen
2015-01-02 17:08:52 +00:00
committed by Dmitry Shmidt
parent 9978d1393f
commit 30786a0ac3
2 changed files with 11 additions and 0 deletions
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10
kernel/sched/core.c
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@@ -5996,11 +5996,13 @@ 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;
@@ -6021,6 +6023,14 @@ 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);
}
/*

1
kernel/sched/sched.h
View File

@@ -885,6 +885,7 @@ 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;