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From a90c8ec93f298cccfbc4db29a8513675002da326 Mon Sep 17 00:00:00 2001
From: Morten Rasmussen <morten.rasmussen@arm.com>
Date: Fri, 2 Jan 2015 17:08:52 +0000
Subject: [PATCH 52/92] 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: Morten Rasmussen <morten.rasmussen@arm.com>
(cherry picked from commit c4eb7a2b0a1908a377fb063ecae89d7bacd6aa78)
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
---
kernel/sched/core.c | 10 ++++++++++
kernel/sched/sched.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b450329..f2642d4 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6001,11 +6001,13 @@ static void destroy_sched_domains(struct sched_domain *sd)
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;
@@ -6026,6 +6028,14 @@ 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);
}
/*
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 46787bd..22b7cfd 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -892,6 +892,7 @@ static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
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;
--
1.9.1
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