From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933978AbbELTm5 (ORCPT ); Tue, 12 May 2015 15:42:57 -0400 Received: from foss.arm.com ([217.140.101.70]:33937 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933894AbbELTik (ORCPT ); Tue, 12 May 2015 15:38:40 -0400 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: vincent.guittot@linaro.org, Dietmar Eggemann , yuyang.du@intel.com, preeti@linux.vnet.ibm.com, mturquette@linaro.org, rjw@rjwysocki.net, Juri Lelli , sgurrappadi@nvidia.com, pang.xunlei@zte.com.cn, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, morten.rasmussen@arm.com Subject: [RFCv4 PATCH 21/34] sched: Highest energy aware balancing sched_domain level pointer Date: Tue, 12 May 2015 20:38:56 +0100 Message-Id: <1431459549-18343-22-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1431459549-18343-1-git-send-email-morten.rasmussen@arm.com> References: <1431459549-18343-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add another member to the family of per-cpu sched_domain shortcut pointers. This one, sd_ea, points to the highest level at which energy model is provided. At this level and all levels below all sched_groups have energy model data attached. Partial energy model information is possible but restricted to providing energy model data for lower level sched_domains (sd_ea and below) and leaving load-balancing on levels above to non-energy-aware load-balancing. For example, it is possible to apply energy-aware scheduling within each socket on a multi-socket system and let normal scheduling handle load-balancing between sockets. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/core.c | 11 ++++++++++- kernel/sched/sched.h | 1 + 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5499b2c..8818bf0 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5777,11 +5777,12 @@ DEFINE_PER_CPU(int, sd_llc_id); DEFINE_PER_CPU(struct sched_domain *, sd_numa); DEFINE_PER_CPU(struct sched_domain *, sd_busy); DEFINE_PER_CPU(struct sched_domain *, sd_asym); +DEFINE_PER_CPU(struct sched_domain *, sd_ea); static void update_top_cache_domain(int cpu) { struct sched_domain *sd; - struct sched_domain *busy_sd = NULL; + struct sched_domain *busy_sd = NULL, *ea_sd = NULL; int id = cpu; int size = 1; @@ -5802,6 +5803,14 @@ static void update_top_cache_domain(int cpu) sd = highest_flag_domain(cpu, SD_ASYM_PACKING); rcu_assign_pointer(per_cpu(sd_asym, cpu), sd); + + for_each_domain(cpu, sd) { + if (sd->groups->sge) + ea_sd = sd; + else + break; + } + rcu_assign_pointer(per_cpu(sd_ea, cpu), ea_sd); } /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index ea32e9e..b627dfa 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -829,6 +829,7 @@ DECLARE_PER_CPU(int, sd_llc_id); DECLARE_PER_CPU(struct sched_domain *, sd_numa); DECLARE_PER_CPU(struct sched_domain *, sd_busy); DECLARE_PER_CPU(struct sched_domain *, sd_asym); +DECLARE_PER_CPU(struct sched_domain *, sd_ea); struct sched_group_capacity { atomic_t ref; -- 1.9.1