Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753238Ab3FGHaZ (ORCPT ); Fri, 7 Jun 2013 03:30:25 -0400 Received: from mga02.intel.com ([134.134.136.20]:11064 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753087Ab3FGHaW (ORCPT ); Fri, 7 Jun 2013 03:30:22 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,820,1363158000"; d="scan'208";a="325673053" From: Alex Shi To: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, bp@alien8.de, pjt@google.com, namhyung@kernel.org, efault@gmx.de, morten.rasmussen@arm.com Cc: vincent.guittot@linaro.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, alex.shi@intel.com, mgorman@suse.de, riel@redhat.com, wangyun@linux.vnet.ibm.com, Jason Low Subject: [RFC patch 2/4] sched/tg: use 'unsigned long' for load variable in task group Date: Fri, 7 Jun 2013 15:29:27 +0800 Message-Id: <1370590169-24804-3-git-send-email-alex.shi@intel.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1370590169-24804-1-git-send-email-alex.shi@intel.com> References: <1370590169-24804-1-git-send-email-alex.shi@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3602 Lines: 102 Since tg->load_avg is smaller than tg->load_weight, we don't need a atomic64_t variable for load_avg in 32 bit machine. The same reason for cfs_rq->tg_load_contrib. The atomic_long_t/unsigned long variable type are more efficient and convenience for them. Signed-off-by: Alex Shi --- kernel/sched/debug.c | 6 +++--- kernel/sched/fair.c | 12 ++++++------ kernel/sched/sched.h | 4 ++-- 3 files changed, 11 insertions(+), 11 deletions(-) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 160afdc..d803989 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -215,9 +215,9 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) cfs_rq->runnable_load_avg); SEQ_printf(m, " .%-30s: %ld\n", "blocked_load_avg", cfs_rq->blocked_load_avg); - SEQ_printf(m, " .%-30s: %lld\n", "tg_load_avg", - (unsigned long long)atomic64_read(&cfs_rq->tg->load_avg)); - SEQ_printf(m, " .%-30s: %lld\n", "tg_load_contrib", + SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", + atomic_long_read(&cfs_rq->tg->load_avg)); + SEQ_printf(m, " .%-30s: %ld\n", "tg_load_contrib", cfs_rq->tg_load_contrib); SEQ_printf(m, " .%-30s: %d\n", "tg_runnable_contrib", cfs_rq->tg_runnable_contrib); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 985d47e..30fb7dc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1075,7 +1075,7 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq) * to gain a more accurate current total weight. See * update_cfs_rq_load_contribution(). */ - tg_weight = atomic64_read(&tg->load_avg); + tg_weight = atomic_long_read(&tg->load_avg); tg_weight -= cfs_rq->tg_load_contrib; tg_weight += cfs_rq->load.weight; @@ -1356,13 +1356,13 @@ static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq, int force_update) { struct task_group *tg = cfs_rq->tg; - s64 tg_contrib; + long tg_contrib; tg_contrib = cfs_rq->runnable_load_avg; tg_contrib -= cfs_rq->tg_load_contrib; - if (force_update || abs64(tg_contrib) > cfs_rq->tg_load_contrib / 8) { - atomic64_add(tg_contrib, &tg->load_avg); + if (force_update || abs(tg_contrib) > cfs_rq->tg_load_contrib / 8) { + atomic_long_add(tg_contrib, &tg->load_avg); cfs_rq->tg_load_contrib += tg_contrib; } } @@ -1397,8 +1397,8 @@ static inline void __update_group_entity_contrib(struct sched_entity *se) u64 contrib; contrib = cfs_rq->tg_load_contrib * tg->shares; - se->avg.load_avg_contrib = div64_u64(contrib, - atomic64_read(&tg->load_avg) + 1); + se->avg.load_avg_contrib = div_u64(contrib, + atomic_long_read(&tg->load_avg) + 1); /* * For group entities we need to compute a correction term in the case diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 5a80943..1bfa91a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -150,7 +150,7 @@ struct task_group { atomic_t load_weight; #ifdef CONFIG_SMP - atomic64_t load_avg; + atomic_long_t load_avg; atomic_t runnable_avg; #endif #endif @@ -284,7 +284,7 @@ struct cfs_rq { #ifdef CONFIG_FAIR_GROUP_SCHED /* Required to track per-cpu representation of a task_group */ u32 tg_runnable_contrib; - u64 tg_load_contrib; + unsigned long tg_load_contrib; #endif /* CONFIG_FAIR_GROUP_SCHED */ /* -- 1.7.12 -- 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/