Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933202AbbGGSZH (ORCPT ); Tue, 7 Jul 2015 14:25:07 -0400 Received: from foss.arm.com ([217.140.101.70]:37571 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932593AbbGGSXH (ORCPT ); Tue, 7 Jul 2015 14:23:07 -0400 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: vincent.guittot@linaro.org, daniel.lezcano@linaro.org, Dietmar Eggemann , yuyang.du@intel.com, mturquette@baylibre.com, rjw@rjwysocki.net, Juri Lelli , sgurrappadi@nvidia.com, pang.xunlei@zte.com.cn, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Dietmar Eggemann Subject: [RFCv5 PATCH 26/46] sched: Store system-wide maximum cpu capacity in root domain Date: Tue, 7 Jul 2015 19:24:09 +0100 Message-Id: <1436293469-25707-27-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1436293469-25707-1-git-send-email-morten.rasmussen@arm.com> References: <1436293469-25707-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2057 Lines: 68 From: Dietmar Eggemann 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 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/