Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933871AbbELTi0 (ORCPT ); Tue, 12 May 2015 15:38:26 -0400 Received: from foss.arm.com ([217.140.101.70]:33866 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933852AbbELTiW (ORCPT ); Tue, 12 May 2015 15:38:22 -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 14/34] sched: Make energy awareness a sched feature Date: Tue, 12 May 2015 20:38:49 +0100 Message-Id: <1431459549-18343-15-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 Content-Length: 2076 Lines: 65 This patch introduces the ENERGY_AWARE sched feature, which is implemented using jump labels when SCHED_DEBUG is defined. It is statically set false when SCHED_DEBUG is not defined. Hence this doesn't allow energy awareness to be enabled without SCHED_DEBUG. This sched_feature knob will be replaced later with a more appropriate control knob when things have matured a bit. ENERGY_AWARE is based on per-entity load-tracking hence FAIR_GROUP_SCHED must be enable. This dependency isn't checked at compile time yet. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/fair.c | 6 ++++++ kernel/sched/features.h | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f20fae9..5980bdd 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4766,6 +4766,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) return wl; } + #else static long effective_load(struct task_group *tg, int cpu, long wl, long wg) @@ -4775,6 +4776,11 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) #endif +static inline bool energy_aware(void) +{ + return sched_feat(ENERGY_AWARE); +} + static int wake_wide(struct task_struct *p) { int factor = this_cpu_read(sd_llc_size); diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 03d8072..92bc36e 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -91,3 +91,9 @@ SCHED_FEAT(NUMA_FAVOUR_HIGHER, true) */ SCHED_FEAT(NUMA_RESIST_LOWER, false) #endif + +/* + * Energy aware scheduling. Use platform energy model to guide scheduling + * decisions optimizing for energy efficiency. + */ +SCHED_FEAT(ENERGY_AWARE, false) -- 1.9.1 -- 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/