From 1eb2b8aa45840b50cd953052315a8b4f6bc6416d Mon Sep 17 00:00:00 2001 From: Dietmar Eggemann Date: Thu, 7 May 2015 18:46:15 +0100 Subject: [PATCH] sched: Store system-wide maximum cpu capacity in root domain To be able to compare the capacity of the target cpu with the highest cpu capacity of the system in the wakeup path, store the system-wide maximum cpu capacity in the root domain. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Dietmar Eggemann --- kernel/sched/core.c | 8 ++++++++ kernel/sched/sched.h | 3 +++ 2 files changed, 11 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 732e993b564b..7c6e2b326349 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6971,6 +6971,7 @@ static int build_sched_domains(const struct cpumask *cpu_map, enum s_alloc alloc_state; struct sched_domain *sd; struct s_data d; + struct rq *rq = NULL; int i, ret = -ENOMEM; alloc_state = __visit_domain_allocation_hell(&d, cpu_map); @@ -7021,11 +7022,18 @@ static int build_sched_domains(const struct cpumask *cpu_map, /* Attach the domains */ rcu_read_lock(); for_each_cpu(i, cpu_map) { + rq = cpu_rq(i); sd = *per_cpu_ptr(d.sd, i); cpu_attach_domain(sd, d.rd, i); + + if (rq->cpu_capacity_orig > rq->rd->max_cpu_capacity) + rq->rd->max_cpu_capacity = rq->cpu_capacity_orig; } rcu_read_unlock(); + if (rq) + pr_info("max cpu_capacity %lu\n", rq->rd->max_cpu_capacity); + ret = 0; error: __free_domain_allocs(&d, alloc_state, cpu_map); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index b242775bf670..2b7ffa5a20ad 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -543,6 +543,9 @@ struct root_domain { */ cpumask_var_t rto_mask; struct cpupri cpupri; + + /* Maximum cpu capacity in the system. */ + unsigned long max_cpu_capacity; }; extern struct root_domain def_root_domain; -- 2.20.1