Messages in this thread Patch in this message | | | From | Morten Rasmussen <> | Subject | [RFCv4 PATCH 26/34] sched: Store system-wide maximum cpu capacity in root domain | Date | Tue, 12 May 2015 20:39:01 +0100 |
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From: Dietmar Eggemann <dietmar.eggemann@arm.com>
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> --- 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 8818bf0..d307db8 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6848,6 +6848,7 @@ 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; int i, ret = -ENOMEM; alloc_state = __visit_domain_allocation_hell(&d, cpu_map); @@ -6901,11 +6902,18 @@ 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(); + rq = cpu_rq(cpumask_first(cpu_map)); + 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 a5d2d69..95c8ff7 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -553,6 +553,9 @@ 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; -- 1.9.1
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