From 9a77830051a2c009e8282eecbbc62daab15b9afa Mon Sep 17 00:00:00 2001 From: Morten Rasmussen Date: Fri, 2 Jan 2015 17:08:52 +0000 Subject: [PATCH] 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 cc: Peter Zijlstra Signed-off-by: Morten Rasmussen Change-Id: Ie9ff4dc97b4fda3292ce58c22f1032cd3085529c Signed-off-by: Chris Redpath --- kernel/sched/sched.h | 1 + kernel/sched/topology.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 6268ec91b919..b2607554b91a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -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; diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 809de61dad91..7978cd8b621d 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -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); } /* -- 2.20.1