From: Morten Rasmussen Date: Fri, 2 Jan 2015 17:08:52 +0000 (+0000) Subject: sched: Highest energy aware balancing sched_domain level pointer X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=87770299ab83add1536974f92492f98ccc48025d;p=platform%2Fkernel%2Flinux-exynos.git 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 Signed-off-by: Lukasz Luba --- diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index e6fc0361181e..53d7b0340947 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1074,6 +1074,7 @@ 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 61760b846d5e..64f6c6c58000 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -413,11 +413,13 @@ 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; @@ -438,6 +440,14 @@ 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); } /*