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[209.132.180.67]) by mx.google.com with ESMTP id e2si1141454pba.91.2014.03.12.23.05.31; Wed, 12 Mar 2014 23:05:31 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753378AbaCMGFY (ORCPT + 26 others); Thu, 13 Mar 2014 02:05:24 -0400 Received: from mail-pb0-f44.google.com ([209.85.160.44]:39390 "EHLO mail-pb0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751237AbaCMGFX (ORCPT ); Thu, 13 Mar 2014 02:05:23 -0400 Received: by mail-pb0-f44.google.com with SMTP id rp16so626409pbb.17 for ; Wed, 12 Mar 2014 23:05:22 -0700 (PDT) X-Received: by 10.68.11.199 with SMTP id s7mr167953pbb.12.1394690722469; Wed, 12 Mar 2014 23:05:22 -0700 (PDT) Received: from localhost.localdomain ([116.232.110.156]) by mx.google.com with ESMTPSA id ix2sm3136331pbc.45.2014.03.12.23.04.41 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 12 Mar 2014 23:05:21 -0700 (PDT) From: Alex Shi To: mingo@redhat.com, peterz@infradead.org, morten.rasmussen@arm.com Cc: vincent.guittot@linaro.org, daniel.lezcano@linaro.org, fweisbec@gmail.com, linux@arm.linux.org.uk, tony.luck@intel.com, fenghua.yu@intel.com, james.hogan@imgtec.com, alex.shi@linaro.org, jason.low2@hp.com, viresh.kumar@linaro.org, hanjun.guo@linaro.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, pjt@google.com, fengguang.wu@intel.com, linaro-kernel@lists.linaro.org, wangyun@linux.vnet.ibm.com, mgorman@suse.de Subject: [PATCH 7/8] sched: remove rq->cpu_load and rq->nr_load_updates Date: Thu, 13 Mar 2014 13:57:28 +0800 Message-Id: <1394690249-14130-8-git-send-email-alex.shi@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1394690249-14130-1-git-send-email-alex.shi@linaro.org> References: <1394690249-14130-1-git-send-email-alex.shi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: alex.shi@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.128.169 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , The cpu_load is the copy of rq->cfs.runnable_load_avg. And it updated on time. So we can use the latter directly. Thus saved 2 rq variables: cpu_load and nr_load_updates. Then don't need __update_cpu_load(), just keep sched_avg_update(). Thus removed get_rq_runnable_load() which used for update_cpu_load only. Signed-off-by: Alex Shi --- kernel/sched/core.c | 2 -- kernel/sched/debug.c | 2 -- kernel/sched/proc.c | 55 +++++++++++++--------------------------------------- kernel/sched/sched.h | 2 -- 4 files changed, 13 insertions(+), 48 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 1fdfdc6..f271997 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6874,8 +6874,6 @@ void __init sched_init(void) #ifdef CONFIG_RT_GROUP_SCHED init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL); #endif - - rq->cpu_load = 0; rq->last_load_update_tick = jiffies; #ifdef CONFIG_SMP diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index a24d549..83737ce 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -298,12 +298,10 @@ do { \ SEQ_printf(m, " .%-30s: %lu\n", "load", rq->load.weight); P(nr_switches); - P(nr_load_updates); P(nr_uninterruptible); PN(next_balance); SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); PN(clock); - P(cpu_load); #undef P #undef PN diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c index 383c4ba..dd3c2d9 100644 --- a/kernel/sched/proc.c +++ b/kernel/sched/proc.c @@ -8,12 +8,19 @@ #include "sched.h" +#ifdef CONFIG_SMP unsigned long this_cpu_load(void) { - struct rq *this = this_rq(); - return this->cpu_load; + struct rq *rq = this_rq(); + return rq->cfs.runnable_load_avg; } - +#else +unsigned long this_cpu_load(void) +{ + struct rq *rq = this_rq(); + return rq->load.weight; +} +#endif /* * Global load-average calculations @@ -398,34 +405,6 @@ static void calc_load_account_active(struct rq *this_rq) * End of global load-average stuff */ - -/* - * Update rq->cpu_load statistics. This function is usually called every - * scheduler tick (TICK_NSEC). With tickless idle this will not be called - * every tick. We fix it up based on jiffies. - */ -static void __update_cpu_load(struct rq *this_rq, unsigned long this_load) -{ - this_rq->nr_load_updates++; - - /* Update our load: */ - this_rq->cpu_load = this_load; /* Fasttrack for idx 0 */ - - sched_avg_update(this_rq); -} - -#ifdef CONFIG_SMP -static inline unsigned long get_rq_runnable_load(struct rq *rq) -{ - return rq->cfs.runnable_load_avg; -} -#else -static inline unsigned long get_rq_runnable_load(struct rq *rq) -{ - return rq->load.weight; -} -#endif - #ifdef CONFIG_NO_HZ_COMMON /* * There is no sane way to deal with nohz on smp when using jiffies because the @@ -447,17 +426,15 @@ static inline unsigned long get_rq_runnable_load(struct rq *rq) void update_idle_cpu_load(struct rq *this_rq) { unsigned long curr_jiffies = ACCESS_ONCE(jiffies); - unsigned long load = get_rq_runnable_load(this_rq); /* * bail if there's load or we're actually up-to-date. */ - if (load || curr_jiffies == this_rq->last_load_update_tick) + if (curr_jiffies == this_rq->last_load_update_tick) return; this_rq->last_load_update_tick = curr_jiffies; - - __update_cpu_load(this_rq, load); + sched_avg_update(this_rq); } /* @@ -466,7 +443,6 @@ void update_idle_cpu_load(struct rq *this_rq) void update_cpu_load_nohz(void) { struct rq *this_rq = this_rq(); - update_idle_cpu_load(this_rq); } #endif /* CONFIG_NO_HZ */ @@ -476,12 +452,7 @@ void update_cpu_load_nohz(void) */ void update_cpu_load_active(struct rq *this_rq) { - unsigned long load = get_rq_runnable_load(this_rq); - /* - * See the mess around update_idle_cpu_load() / update_cpu_load_nohz(). - */ this_rq->last_load_update_tick = jiffies; - __update_cpu_load(this_rq, load); - + sched_avg_update(this_rq); calc_load_account_active(this_rq); } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 87d2279..a5391cf 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -528,7 +528,6 @@ struct rq { unsigned int nr_numa_running; unsigned int nr_preferred_running; #endif - unsigned long cpu_load; unsigned long last_load_update_tick; #ifdef CONFIG_NO_HZ_COMMON u64 nohz_stamp; @@ -541,7 +540,6 @@ struct rq { /* capture load from *all* tasks on this cpu: */ struct load_weight load; - unsigned long nr_load_updates; u64 nr_switches; struct cfs_rq cfs;