diff options
| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2015-05-07 18:46:15 +0100 |
|---|---|---|
| committer | Leo Yan <leo.yan@linaro.org> | 2016-05-10 16:49:49 +0800 |
| commit | 1eb2b8aa45840b50cd953052315a8b4f6bc6416d (patch) | |
| tree | e7039bad31c61264648889d83c3af788e6354225 /kernel/sched | |
| parent | 0f8edc82743fd749a3536c68386c89112e760792 (diff) | |
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 <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 8 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 3 |
2 files changed, 11 insertions, 0 deletions
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; |