From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754423AbcEWK6m (ORCPT ); Mon, 23 May 2016 06:58:42 -0400 Received: from foss.arm.com ([217.140.101.70]:50154 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754387AbcEWK6i (ORCPT ); Mon, 23 May 2016 06:58:38 -0400 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: dietmar.eggemann@arm.com, yuyang.du@intel.com, vincent.guittot@linaro.org, mgalbraith@suse.de, linux-kernel@vger.kernel.org, Morten Rasmussen Subject: [PATCH 08/16] sched: Store maximum per-cpu capacity in root domain Date: Mon, 23 May 2016 11:58:50 +0100 Message-Id: <1464001138-25063-9-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> References: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dietmar Eggemann To be able to compare the capacity of the target cpu with the highest available cpu capacity, store the maximum per-cpu capacity in the root domain. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Dietmar Eggemann Signed-off-by: Morten Rasmussen --- kernel/sched/core.c | 9 +++++++++ kernel/sched/sched.h | 2 ++ 2 files changed, 11 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 8014b4a..1d4059c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6841,6 +6841,7 @@ 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); @@ -6891,11 +6892,19 @@ 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("span: %*pbl (max cpu_capacity = %lu)\n", + cpumask_pr_args(cpu_map), 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 e51145e..72150c2 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -564,6 +564,8 @@ struct root_domain { */ cpumask_var_t rto_mask; struct cpupri cpupri; + + unsigned long max_cpu_capacity; }; extern struct root_domain def_root_domain; -- 1.9.1