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Date: Tue, 7 Jul 2015 19:24:09 +0100 From: Morten Rasmussen <morten.rasmussen@....com> To: peterz@...radead.org, mingo@...hat.com Cc: vincent.guittot@...aro.org, daniel.lezcano@...aro.org, Dietmar Eggemann <Dietmar.Eggemann@....com>, yuyang.du@...el.com, mturquette@...libre.com, rjw@...ysocki.net, Juri Lelli <Juri.Lelli@....com>, sgurrappadi@...dia.com, pang.xunlei@....com.cn, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, Dietmar Eggemann <dietmar.eggemann@....com> Subject: [RFCv5 PATCH 26/46] sched: Store system-wide maximum cpu capacity in root domain From: Dietmar Eggemann <dietmar.eggemann@....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@...hat.com> cc: Peter Zijlstra <peterz@...radead.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....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 c7fdd07..fe4b361 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6853,6 +6853,7 @@ 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); @@ -6906,11 +6907,18 @@ 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 fbe2da0..9589d9e 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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