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sched: Store system-wide maximum cpu capacity in root domain

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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>
This commit is contained in:
Dietmar Eggemann
2015-05-07 18:46:15 +01:00
committed by Leo Yan
parent 0f8edc8274
commit 1eb2b8aa45
2 changed files with 11 additions and 0 deletions
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8
kernel/sched/core.c
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@@ -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);

3
kernel/sched/sched.h
View File

@@ -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;