From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933954AbbELTip (ORCPT ); Tue, 12 May 2015 15:38:45 -0400 Received: from foss.arm.com ([217.140.101.70]:33916 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933694AbbELTif (ORCPT ); Tue, 12 May 2015 15:38:35 -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 19/34] sched: Compute cpu capacity available at current frequency Date: Tue, 12 May 2015 20:38:54 +0100 Message-Id: <1431459549-18343-20-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 capacity_orig_of() returns the max available compute capacity of a cpu. For scale-invariant utilization tracking and energy-aware scheduling decisions it is useful to know the compute capacity available at the current OPP of a cpu. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/fair.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 5980bdd..4a8404a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4776,6 +4776,17 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) #endif +/* + * Returns the current capacity of cpu after applying both + * cpu and freq scaling. + */ +static unsigned long capacity_curr_of(int cpu) +{ + return cpu_rq(cpu)->cpu_capacity_orig * + arch_scale_freq_capacity(NULL, cpu) + >> SCHED_CAPACITY_SHIFT; +} + static inline bool energy_aware(void) { return sched_feat(ENERGY_AWARE); -- 1.9.1