From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161730AbbBDSbi (ORCPT ); Wed, 4 Feb 2015 13:31:38 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:41638 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161694AbbBDSbf (ORCPT ); Wed, 4 Feb 2015 13:31:35 -0500 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: vincent.guittot@linaro.org, dietmar.eggemann@arm.com, yuyang.du@intel.com, preeti@linux.vnet.ibm.com, mturquette@linaro.org, nico@linaro.org, rjw@rjwysocki.net, juri.lelli@arm.com, linux-kernel@vger.kernel.org Subject: [RFCv3 PATCH 26/48] sched: Compute cpu capacity available at current frequency Date: Wed, 4 Feb 2015 18:31:03 +0000 Message-Id: <1423074685-6336-27-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1423074685-6336-1-git-send-email-morten.rasmussen@arm.com> References: <1423074685-6336-1-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 2557774..70acb4c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4564,6 +4564,17 @@ 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