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([2a01:e0a:f:6020:3db4:bf23:5fd8:a5]) by smtp.gmail.com with ESMTPSA id l19-20020a05600c2cd300b003cf71b1f66csm1846756wmc.0.2023.02.01.06.36.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Feb 2023 06:36:32 -0800 (PST) From: Vincent Guittot To: mingo@kernel.org, peterz@infradead.org, dietmar.eggemann@arm.com, qyousef@layalina.io, rafael@kernel.org, viresh.kumar@linaro.org, vschneid@redhat.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, kajetan.puchalski@arm.com Cc: lukasz.luba@arm.com, wvw@google.com, xuewen.yan94@gmail.com, han.lin@mediatek.com, Jonathan.JMChen@mediatek.com, Vincent Guittot Subject: [PATCH 1/2 v5] sched/fair: unlink misfit task from cpu overutilized Date: Wed, 1 Feb 2023 15:36:27 +0100 Message-Id: <20230201143628.270912-2-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230201143628.270912-1-vincent.guittot@linaro.org> References: <20230201143628.270912-1-vincent.guittot@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" By taking into account uclamp_min, the 1:1 relation between task misfit and cpu overutilized is no more true as a task with a small util_avg may not fit a high capacity cpu because of uclamp_min constraint. Add a new state in util_fits_cpu() to reflect the case that task would fit a CPU except for the uclamp_min hint which is a performance requirement. Use -1 to reflect that a CPU doesn't fit only because of uclamp_min so we can use this new value to take additional action to select the best CPU that doesn't match uclamp_min hint. When util_fits_cpu() returns -1, we will continue to look for a possible CPU with better performance, which replaces Capacity Inversion detection with capacity_orig_of() - thermal_load_avg to detect a capacity inversion. Signed-off-by: Vincent Guittot Tested-by: Kajetan Puchalski Reviewed-and-tested-by: Qais Yousef Reviewed-by: Dietmar Eggemann Acked-by: Rafael J. Wysocki --- Change since v4: - Add more details in commit message - Fix typo - Add Tag kernel/sched/fair.c | 105 ++++++++++++++++++++++++++++++++++---------- 1 file changed, 82 insertions(+), 23 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 7c46485d65d7..074742f107c0 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4561,8 +4561,8 @@ static inline int util_fits_cpu(unsigned long util, * handle the case uclamp_min > uclamp_max. */ uclamp_min =3D min(uclamp_min, uclamp_max); - if (util < uclamp_min && capacity_orig !=3D SCHED_CAPACITY_SCALE) - fits =3D fits && (uclamp_min <=3D capacity_orig_thermal); + if (fits && (util < uclamp_min) && (uclamp_min > capacity_orig_thermal)) + return -1; =20 return fits; } @@ -4572,7 +4572,11 @@ static inline int task_fits_cpu(struct task_struct *= p, int cpu) unsigned long uclamp_min =3D uclamp_eff_value(p, UCLAMP_MIN); unsigned long uclamp_max =3D uclamp_eff_value(p, UCLAMP_MAX); unsigned long util =3D task_util_est(p); - return util_fits_cpu(util, uclamp_min, uclamp_max, cpu); + /* + * Return true only if the cpu fully fits the task requirements, which + * include the utilization but also the performance hints. + */ + return (util_fits_cpu(util, uclamp_min, uclamp_max, cpu) > 0); } =20 static inline void update_misfit_status(struct task_struct *p, struct rq *= rq) @@ -6138,6 +6142,7 @@ static inline bool cpu_overutilized(int cpu) unsigned long rq_util_min =3D uclamp_rq_get(cpu_rq(cpu), UCLAMP_MIN); unsigned long rq_util_max =3D uclamp_rq_get(cpu_rq(cpu), UCLAMP_MAX); =20 + /* Return true only if the utilization doesn't fit CPU's capacity */ return !util_fits_cpu(cpu_util_cfs(cpu), rq_util_min, rq_util_max, cpu); } =20 @@ -6931,6 +6936,7 @@ static int select_idle_capacity(struct task_struct *p, struct sched_domain *sd, int t= arget) { unsigned long task_util, util_min, util_max, best_cap =3D 0; + int fits, best_fits =3D 0; int cpu, best_cpu =3D -1; struct cpumask *cpus; =20 @@ -6946,12 +6952,28 @@ select_idle_capacity(struct task_struct *p, struct = sched_domain *sd, int target) =20 if (!available_idle_cpu(cpu) && !sched_idle_cpu(cpu)) continue; - if (util_fits_cpu(task_util, util_min, util_max, cpu)) + + fits =3D util_fits_cpu(task_util, util_min, util_max, cpu); + + /* This CPU fits with all requirements */ + if (fits > 0) return cpu; + /* + * Only the min performance hint (i.e. uclamp_min) doesn't fit. + * Look for the CPU with best capacity. + */ + else if (fits < 0) + cpu_cap =3D capacity_orig_of(cpu) - thermal_load_avg(cpu_rq(cpu)); =20 - if (cpu_cap > best_cap) { + /* + * First, select CPU which fits better (-1 being better than 0). + * Then, select the one with best capacity at same level. + */ + if ((fits < best_fits) || + ((fits =3D=3D best_fits) && (cpu_cap > best_cap))) { best_cap =3D cpu_cap; best_cpu =3D cpu; + best_fits =3D fits; } } =20 @@ -6964,7 +6986,11 @@ static inline bool asym_fits_cpu(unsigned long util, int cpu) { if (sched_asym_cpucap_active()) - return util_fits_cpu(util, util_min, util_max, cpu); + /* + * Return true only if the cpu fully fits the task requirements + * which include the utilization and the performance hints. + */ + return (util_fits_cpu(util, util_min, util_max, cpu) > 0); =20 return true; } @@ -7331,6 +7357,9 @@ static int find_energy_efficient_cpu(struct task_stru= ct *p, int prev_cpu) unsigned long p_util_max =3D uclamp_is_used() ? uclamp_eff_value(p, UCLAM= P_MAX) : 1024; struct root_domain *rd =3D this_rq()->rd; int cpu, best_energy_cpu, target =3D -1; + int prev_fits =3D -1, best_fits =3D -1; + unsigned long best_thermal_cap =3D 0; + unsigned long prev_thermal_cap =3D 0; struct sched_domain *sd; struct perf_domain *pd; struct energy_env eenv; @@ -7366,6 +7395,7 @@ static int find_energy_efficient_cpu(struct task_stru= ct *p, int prev_cpu) unsigned long prev_spare_cap =3D 0; int max_spare_cap_cpu =3D -1; unsigned long base_energy; + int fits, max_fits =3D -1; =20 cpumask_and(cpus, perf_domain_span(pd), cpu_online_mask); =20 @@ -7415,7 +7445,9 @@ static int find_energy_efficient_cpu(struct task_stru= ct *p, int prev_cpu) util_min =3D max(rq_util_min, p_util_min); util_max =3D max(rq_util_max, p_util_max); } - if (!util_fits_cpu(util, util_min, util_max, cpu)) + + fits =3D util_fits_cpu(util, util_min, util_max, cpu); + if (!fits) continue; =20 lsub_positive(&cpu_cap, util); @@ -7423,7 +7455,9 @@ static int find_energy_efficient_cpu(struct task_stru= ct *p, int prev_cpu) if (cpu =3D=3D prev_cpu) { /* Always use prev_cpu as a candidate. */ prev_spare_cap =3D cpu_cap; - } else if (cpu_cap > max_spare_cap) { + prev_fits =3D fits; + } else if ((fits > max_fits) || + ((fits =3D=3D max_fits) && (cpu_cap > max_spare_cap))) { /* * Find the CPU with the maximum spare capacity * among the remaining CPUs in the performance @@ -7431,6 +7465,7 @@ static int find_energy_efficient_cpu(struct task_stru= ct *p, int prev_cpu) */ max_spare_cap =3D cpu_cap; max_spare_cap_cpu =3D cpu; + max_fits =3D fits; } } =20 @@ -7449,26 +7484,50 @@ static int find_energy_efficient_cpu(struct task_st= ruct *p, int prev_cpu) if (prev_delta < base_energy) goto unlock; prev_delta -=3D base_energy; + prev_thermal_cap =3D cpu_thermal_cap; best_delta =3D min(best_delta, prev_delta); } =20 /* Evaluate the energy impact of using max_spare_cap_cpu. */ if (max_spare_cap_cpu >=3D 0 && max_spare_cap > prev_spare_cap) { + /* Current best energy cpu fits better */ + if (max_fits < best_fits) + continue; + + /* + * Both don't fit performance hint (i.e. uclamp_min) + * but best energy cpu has better capacity. + */ + if ((max_fits < 0) && + (cpu_thermal_cap <=3D best_thermal_cap)) + continue; + cur_delta =3D compute_energy(&eenv, pd, cpus, p, max_spare_cap_cpu); /* CPU utilization has changed */ if (cur_delta < base_energy) goto unlock; cur_delta -=3D base_energy; - if (cur_delta < best_delta) { - best_delta =3D cur_delta; - best_energy_cpu =3D max_spare_cap_cpu; - } + + /* + * Both fit for the task but best energy cpu has lower + * energy impact. + */ + if ((max_fits > 0) && (best_fits > 0) && + (cur_delta >=3D best_delta)) + continue; + + best_delta =3D cur_delta; + best_energy_cpu =3D max_spare_cap_cpu; + best_fits =3D max_fits; + best_thermal_cap =3D cpu_thermal_cap; } } rcu_read_unlock(); =20 - if (best_delta < prev_delta) + if ((best_fits > prev_fits) || + ((best_fits > 0) && (best_delta < prev_delta)) || + ((best_fits < 0) && (best_thermal_cap > prev_thermal_cap))) target =3D best_energy_cpu; =20 return target; @@ -10271,24 +10330,23 @@ static struct sched_group *find_busiest_group(str= uct lb_env *env) */ update_sd_lb_stats(env, &sds); =20 - if (sched_energy_enabled()) { - struct root_domain *rd =3D env->dst_rq->rd; - - if (rcu_dereference(rd->pd) && !READ_ONCE(rd->overutilized)) - goto out_balanced; - } - - local =3D &sds.local_stat; - busiest =3D &sds.busiest_stat; - /* There is no busy sibling group to pull tasks from */ if (!sds.busiest) goto out_balanced; =20 + busiest =3D &sds.busiest_stat; + /* Misfit tasks should be dealt with regardless of the avg load */ if (busiest->group_type =3D=3D group_misfit_task) goto force_balance; =20 + if (sched_energy_enabled()) { + struct root_domain *rd =3D env->dst_rq->rd; + + if (rcu_dereference(rd->pd) && !READ_ONCE(rd->overutilized)) + goto out_balanced; + } + /* ASYM feature bypasses nice load balance check */ if (busiest->group_type =3D=3D group_asym_packing) goto force_balance; @@ -10301,6 +10359,7 @@ static struct sched_group *find_busiest_group(struc= t lb_env *env) if (busiest->group_type =3D=3D group_imbalanced) goto force_balance; =20 + local =3D &sds.local_stat; /* * If the local group is busier than the selected busiest group * don't try and pull any tasks. --=20 2.34.1 From nobody Sat Sep 13 15:06:08 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E98EC05027 for ; Wed, 1 Feb 2023 14:36:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232462AbjBAOgn (ORCPT ); Wed, 1 Feb 2023 09:36:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232308AbjBAOgh (ORCPT ); Wed, 1 Feb 2023 09:36:37 -0500 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6029F46D6B for ; Wed, 1 Feb 2023 06:36:36 -0800 (PST) Received: by mail-wm1-x333.google.com with SMTP id bg13-20020a05600c3c8d00b003d9712b29d2so1544338wmb.2 for ; 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([2a01:e0a:f:6020:3db4:bf23:5fd8:a5]) by smtp.gmail.com with ESMTPSA id l19-20020a05600c2cd300b003cf71b1f66csm1846756wmc.0.2023.02.01.06.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Feb 2023 06:36:34 -0800 (PST) From: Vincent Guittot To: mingo@kernel.org, peterz@infradead.org, dietmar.eggemann@arm.com, qyousef@layalina.io, rafael@kernel.org, viresh.kumar@linaro.org, vschneid@redhat.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, kajetan.puchalski@arm.com Cc: lukasz.luba@arm.com, wvw@google.com, xuewen.yan94@gmail.com, han.lin@mediatek.com, Jonathan.JMChen@mediatek.com, Vincent Guittot Subject: [PATCH 2/2 v5] sched/fair: Remove capacity inversion detection Date: Wed, 1 Feb 2023 15:36:28 +0100 Message-Id: <20230201143628.270912-3-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230201143628.270912-1-vincent.guittot@linaro.org> References: <20230201143628.270912-1-vincent.guittot@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Remove the capacity inversion detection which is now handled by util_fits_cpu() returning -1 when we need to continue to look for a potential CPU with better performance. This ends up almost reverting patches below except for some comments: commit da07d2f9c153 ("sched/fair: Fixes for capacity inversion detection") commit aa69c36f31aa ("sched/fair: Consider capacity inversion in util_fits_= cpu()") commit 44c7b80bffc3 ("sched/fair: Detect capacity inversion") Signed-off-by: Vincent Guittot Acked-by: Rafael J. Wysocki Reviewed-by: Qais Yousef --- kernel/sched/fair.c | 84 +++----------------------------------------- kernel/sched/sched.h | 19 ---------- 2 files changed, 5 insertions(+), 98 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 074742f107c0..c6c8e7f52935 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4476,17 +4476,9 @@ static inline int util_fits_cpu(unsigned long util, * * For uclamp_max, we can tolerate a drop in performance level as the * goal is to cap the task. So it's okay if it's getting less. - * - * In case of capacity inversion we should honour the inverted capacity - * for both uclamp_min and uclamp_max all the time. */ - capacity_orig =3D cpu_in_capacity_inversion(cpu); - if (capacity_orig) { - capacity_orig_thermal =3D capacity_orig; - } else { - capacity_orig =3D capacity_orig_of(cpu); - capacity_orig_thermal =3D capacity_orig - arch_scale_thermal_pressure(cp= u); - } + capacity_orig =3D capacity_orig_of(cpu); + capacity_orig_thermal =3D capacity_orig - arch_scale_thermal_pressure(cpu= ); =20 /* * We want to force a task to fit a cpu as implied by uclamp_max. @@ -9027,82 +9019,16 @@ static unsigned long scale_rt_capacity(int cpu) =20 static void update_cpu_capacity(struct sched_domain *sd, int cpu) { - unsigned long capacity_orig =3D arch_scale_cpu_capacity(cpu); unsigned long capacity =3D scale_rt_capacity(cpu); struct sched_group *sdg =3D sd->groups; - struct rq *rq =3D cpu_rq(cpu); =20 - rq->cpu_capacity_orig =3D capacity_orig; + cpu_rq(cpu)->cpu_capacity_orig =3D arch_scale_cpu_capacity(cpu); =20 if (!capacity) capacity =3D 1; =20 - rq->cpu_capacity =3D capacity; - - /* - * Detect if the performance domain is in capacity inversion state. - * - * Capacity inversion happens when another perf domain with equal or - * lower capacity_orig_of() ends up having higher capacity than this - * domain after subtracting thermal pressure. - * - * We only take into account thermal pressure in this detection as it's - * the only metric that actually results in *real* reduction of - * capacity due to performance points (OPPs) being dropped/become - * unreachable due to thermal throttling. - * - * We assume: - * * That all cpus in a perf domain have the same capacity_orig - * (same uArch). - * * Thermal pressure will impact all cpus in this perf domain - * equally. - */ - if (sched_energy_enabled()) { - unsigned long inv_cap =3D capacity_orig - thermal_load_avg(rq); - struct perf_domain *pd; - - rcu_read_lock(); - - pd =3D rcu_dereference(rq->rd->pd); - rq->cpu_capacity_inverted =3D 0; - - for (; pd; pd =3D pd->next) { - struct cpumask *pd_span =3D perf_domain_span(pd); - unsigned long pd_cap_orig, pd_cap; - - /* We can't be inverted against our own pd */ - if (cpumask_test_cpu(cpu_of(rq), pd_span)) - continue; - - cpu =3D cpumask_any(pd_span); - pd_cap_orig =3D arch_scale_cpu_capacity(cpu); - - if (capacity_orig < pd_cap_orig) - continue; - - /* - * handle the case of multiple perf domains have the - * same capacity_orig but one of them is under higher - * thermal pressure. We record it as capacity - * inversion. - */ - if (capacity_orig =3D=3D pd_cap_orig) { - pd_cap =3D pd_cap_orig - thermal_load_avg(cpu_rq(cpu)); - - if (pd_cap > inv_cap) { - rq->cpu_capacity_inverted =3D inv_cap; - break; - } - } else if (pd_cap_orig > inv_cap) { - rq->cpu_capacity_inverted =3D inv_cap; - break; - } - } - - rcu_read_unlock(); - } - - trace_sched_cpu_capacity_tp(rq); + cpu_rq(cpu)->cpu_capacity =3D capacity; + trace_sched_cpu_capacity_tp(cpu_rq(cpu)); =20 sdg->sgc->capacity =3D capacity; sdg->sgc->min_capacity =3D capacity; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 1072502976df..3e8df6d31c1e 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1044,7 +1044,6 @@ struct rq { =20 unsigned long cpu_capacity; unsigned long cpu_capacity_orig; - unsigned long cpu_capacity_inverted; =20 struct balance_callback *balance_callback; =20 @@ -2899,24 +2898,6 @@ static inline unsigned long capacity_orig_of(int cpu) return cpu_rq(cpu)->cpu_capacity_orig; } =20 -/* - * Returns inverted capacity if the CPU is in capacity inversion state. - * 0 otherwise. - * - * Capacity inversion detection only considers thermal impact where actual - * performance points (OPPs) gets dropped. - * - * Capacity inversion state happens when another performance domain that h= as - * equal or lower capacity_orig_of() becomes effectively larger than the p= erf - * domain this CPU belongs to due to thermal pressure throttling it hard. - * - * See comment in update_cpu_capacity(). - */ -static inline unsigned long cpu_in_capacity_inversion(int cpu) -{ - return cpu_rq(cpu)->cpu_capacity_inverted; -} - /** * enum cpu_util_type - CPU utilization type * @FREQUENCY_UTIL: Utilization used to select frequency --=20 2.34.1