Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964819AbbELTjL (ORCPT ); Tue, 12 May 2015 15:39:11 -0400 Received: from foss.arm.com ([217.140.101.70]:34038 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964800AbbELTjG (ORCPT ); Tue, 12 May 2015 15:39:06 -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 31/34] sched: Energy-aware wake-up task placement Date: Tue, 12 May 2015 20:39:06 +0100 Message-Id: <1431459549-18343-32-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: 4086 Lines: 130 Let available compute capacity and estimated energy impact select wake-up target cpu when energy-aware scheduling is enabled and the system in not over-utilized (above the tipping point). energy_aware_wake_cpu() attempts to find group of cpus with sufficient compute capacity to accommodate the task and find a cpu with enough spare capacity to handle the task within that group. Preference is given to cpus with enough spare capacity at the current OPP. Finally, the energy impact of the new target and the previous task cpu is compared to select the wake-up target cpu. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/fair.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 84 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index bb44646..fe41e1e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5394,6 +5394,86 @@ static int select_idle_sibling(struct task_struct *p, int target) return target; } +static int energy_aware_wake_cpu(struct task_struct *p) +{ + struct sched_domain *sd; + struct sched_group *sg, *sg_target; + int target_max_cap = INT_MAX; + int target_cpu = task_cpu(p); + int i; + + sd = rcu_dereference(per_cpu(sd_ea, task_cpu(p))); + + if (!sd) + return -1; + + sg = sd->groups; + sg_target = sg; + + /* + * Find group with sufficient capacity. We only get here if no cpu is + * overutilized. We may end up overutilizing a cpu by adding the task, + * but that should not be any worse than select_idle_sibling(). + * load_balance() should sort it out later as we get above the tipping + * point. + */ + do { + /* Assuming all cpus are the same in group */ + int max_cap_cpu = group_first_cpu(sg); + + /* + * Assume smaller max capacity means more energy-efficient. + * Ideally we should query the energy model for the right + * answer but it easily ends up in an exhaustive search. + */ + if (capacity_of(max_cap_cpu) < target_max_cap && + task_fits_capacity(p, max_cap_cpu)) { + sg_target = sg; + target_max_cap = capacity_of(max_cap_cpu); + } + } while (sg = sg->next, sg != sd->groups); + + /* Find cpu with sufficient capacity */ + for_each_cpu_and(i, tsk_cpus_allowed(p), sched_group_cpus(sg_target)) { + /* + * p's blocked utilization is still accounted for on prev_cpu + * so prev_cpu will receive a negative bias due the double + * accouting. However, the blocked utilization may be zero. + */ + int new_usage = get_cpu_usage(i) + task_utilization(p); + + if (new_usage > capacity_orig_of(i)) + continue; + + if (new_usage < capacity_curr_of(i)) { + target_cpu = i; + if (cpu_rq(i)->nr_running) + break; + } + + /* cpu has capacity at higher OPP, keep it as fallback */ + if (target_cpu == task_cpu(p)) + target_cpu = i; + } + + if (target_cpu != task_cpu(p)) { + struct energy_env eenv = { + .usage_delta = task_utilization(p), + .src_cpu = task_cpu(p), + .dst_cpu = target_cpu, + }; + + /* Not enough spare capacity on previous cpu */ + if (cpu_overutilized(task_cpu(p))) + return target_cpu; + + if (energy_diff(&eenv) >= 0) + return task_cpu(p); + } + + return target_cpu; +} + /* * select_task_rq_fair: Select target runqueue for the waking task in domains * that have the 'sd_flag' flag set. In practice, this is SD_BALANCE_WAKE, @@ -5446,7 +5526,10 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f prev_cpu = cpu; if (sd_flag & SD_BALANCE_WAKE && want_sibling) { - new_cpu = select_idle_sibling(p, prev_cpu); + if (energy_aware() && !cpu_rq(cpu)->rd->overutilized) + new_cpu = energy_aware_wake_cpu(p); + else + new_cpu = select_idle_sibling(p, prev_cpu); goto unlock; } -- 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/