From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933490AbaE3Ok6 (ORCPT ); Fri, 30 May 2014 10:40:58 -0400 Received: from mga09.intel.com ([134.134.136.24]:29655 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933461AbaE3Ok4 (ORCPT ); Fri, 30 May 2014 10:40:56 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,941,1392192000"; d="scan'208";a="548946775" From: Yuyang Du To: mingo@redhat.com, peterz@infradead.org, rafael.j.wysocki@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: arjan.van.de.ven@intel.com, len.brown@intel.com, alan.cox@intel.com, mark.gross@intel.com, pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com, vincent.guittot@linaro.org, rajeev.d.muralidhar@intel.com, vishwesh.m.rudramuni@intel.com, nicole.chalhoub@intel.com, ajaya.durg@intel.com, harinarayanan.seshadri@intel.com, jacob.jun.pan@linux.intel.com, fengguang.wu@intel.com, yuyang.du@intel.com Subject: [RFC PATCH 02/16 v3] Define and initialize CPU ConCurrency in struct rq Date: Fri, 30 May 2014 14:35:58 +0800 Message-Id: <1401431772-14320-3-git-send-email-yuyang.du@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> References: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This struct is in CPU's rq and updated with rq->lock held. Signed-off-by: Yuyang Du --- kernel/sched/core.c | 1 + kernel/sched/fair.c | 22 ++++++++++++++++++++++ kernel/sched/sched.h | 18 ++++++++++++++++++ 3 files changed, 41 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 268a45e..69623f1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6881,6 +6881,7 @@ void __init sched_init(void) #ifdef CONFIG_NO_HZ_FULL rq->last_sched_tick = 0; #endif + init_cpu_concurrency(rq); #endif init_rq_hrtick(rq); atomic_set(&rq->nr_iowait, 0); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e7a0d91..2c1f453 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7688,3 +7688,25 @@ __init void init_sched_fair_class(void) #endif /* SMP */ } + +#ifdef CONFIG_SMP + +/* + * CPU ConCurrency (CC) measures the CPU load by averaging + * the number of running tasks. Using CC, the scheduler can + * evaluate the load of CPUs to improve load balance for power + * efficiency without sacrificing performance. + */ + +void init_cpu_concurrency(struct rq *rq) +{ + rq->concurrency.sum = 0; + rq->concurrency.sum_now = 0; + rq->concurrency.contrib = 0; + rq->concurrency.nr_running = 0; + rq->concurrency.sum_timestamp = ULLONG_MAX; + rq->concurrency.contrib_timestamp = ULLONG_MAX; + rq->concurrency.unload = 0; +} + +#endif /* CONFIG_SMP */ diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 5a66776..898127b 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -506,6 +506,18 @@ struct root_domain { extern struct root_domain def_root_domain; +struct cpu_concurrency_t { + u64 sum; + u64 sum_now; + u64 contrib; + u64 sum_timestamp; + u64 contrib_timestamp; + unsigned int nr_running; + int unload; + int dst_cpu; + struct cpu_stop_work unload_work; +}; + #endif /* CONFIG_SMP */ /* @@ -640,6 +652,8 @@ struct rq { #ifdef CONFIG_SMP struct llist_head wake_list; + + struct cpu_concurrency_t concurrency; #endif }; @@ -1182,11 +1196,15 @@ extern void trigger_load_balance(struct rq *rq); extern void idle_enter_fair(struct rq *this_rq); extern void idle_exit_fair(struct rq *this_rq); +extern void init_cpu_concurrency(struct rq *rq); + #else static inline void idle_enter_fair(struct rq *rq) { } static inline void idle_exit_fair(struct rq *rq) { } +static inline void init_cpu_concurrency(struct rq *rq) {} + #endif extern void sysrq_sched_debug_show(void); -- 1.7.9.5