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Wysocki" , Viresh Kumar Cc: linux-kernel@vger.kernel.org, Quentin Perret , Lukasz Luba , linux-pm@vger.kernel.org Subject: [PATCH V2 1/2] sched/core: Rename and move schedutil_cpu_util() to core.c Date: Fri, 23 Oct 2020 15:50:20 +0530 Message-Id: <80c66f55ac7f04b3ecd4ebf12d69d86c89480fa7.1603448113.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.25.0.rc1.19.g042ed3e048af In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There is nothing schedutil specific in schedutil_cpu_util(), move it to core.c and rename it to sched_cpu_util(), so it can be used from other parts of the kernel as well. The cpufreq_cooling stuff will make use of this in a later commit. Signed-off-by: Viresh Kumar --- include/linux/sched.h | 19 +++++ kernel/sched/core.c | 113 ++++++++++++++++++++++++++++++ kernel/sched/cpufreq_schedutil.c | 116 +------------------------------ kernel/sched/fair.c | 6 +- kernel/sched/sched.h | 29 +------- 5 files changed, 140 insertions(+), 143 deletions(-) -- 2.25.0.rc1.19.g042ed3e048af diff --git a/include/linux/sched.h b/include/linux/sched.h index 393db0690101..3c27c10141cb 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1930,6 +1930,25 @@ extern long sched_getaffinity(pid_t pid, struct cpumask *mask); #define TASK_SIZE_OF(tsk) TASK_SIZE #endif +/** + * enum cpu_util_type - CPU utilization type + * @FREQUENCY_UTIL: Utilization used to select frequency + * @ENERGY_UTIL: Utilization used during energy calculation + * + * The utilization signals of all scheduling classes (CFS/RT/DL) and IRQ time + * need to be aggregated differently depending on the usage made of them. This + * enum is used within sched_cpu_util() to differentiate the types of + * utilization expected by the callers, and adjust the aggregation accordingly. + */ +enum cpu_util_type { + FREQUENCY_UTIL, + ENERGY_UTIL, +}; + +/* Returns effective CPU utilization, as seen by the scheduler */ +unsigned long sched_cpu_util(int cpu, enum cpu_util_type type, + unsigned long max); + #ifdef CONFIG_RSEQ /* diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d2003a7d5ab5..369ff54d11d4 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5117,6 +5117,119 @@ struct task_struct *idle_task(int cpu) return cpu_rq(cpu)->idle; } +/* + * This function computes an effective utilization for the given CPU, to be + * used for frequency selection given the linear relation: f = u * f_max. + * + * The scheduler tracks the following metrics: + * + * cpu_util_{cfs,rt,dl,irq}() + * cpu_bw_dl() + * + * Where the cfs,rt and dl util numbers are tracked with the same metric and + * synchronized windows and are thus directly comparable. + * + * The cfs,rt,dl utilization are the running times measured with rq->clock_task + * which excludes things like IRQ and steal-time. These latter are then accrued + * in the irq utilization. + * + * The DL bandwidth number otoh is not a measured metric but a value computed + * based on the task model parameters and gives the minimal utilization + * required to meet deadlines. + */ +unsigned long effective_cpu_util(int cpu, unsigned long util_cfs, + unsigned long max, enum cpu_util_type type, + struct task_struct *p) +{ + unsigned long dl_util, util, irq; + struct rq *rq = cpu_rq(cpu); + + if (!uclamp_is_used() && + type == FREQUENCY_UTIL && rt_rq_is_runnable(&rq->rt)) { + return max; + } + + /* + * Early check to see if IRQ/steal time saturates the CPU, can be + * because of inaccuracies in how we track these -- see + * update_irq_load_avg(). + */ + irq = cpu_util_irq(rq); + if (unlikely(irq >= max)) + return max; + + /* + * Because the time spend on RT/DL tasks is visible as 'lost' time to + * CFS tasks and we use the same metric to track the effective + * utilization (PELT windows are synchronized) we can directly add them + * to obtain the CPU's actual utilization. + * + * CFS and RT utilization can be boosted or capped, depending on + * utilization clamp constraints requested by currently RUNNABLE + * tasks. + * When there are no CFS RUNNABLE tasks, clamps are released and + * frequency will be gracefully reduced with the utilization decay. + */ + util = util_cfs + cpu_util_rt(rq); + if (type == FREQUENCY_UTIL) + util = uclamp_rq_util_with(rq, util, p); + + dl_util = cpu_util_dl(rq); + + /* + * For frequency selection we do not make cpu_util_dl() a permanent part + * of this sum because we want to use cpu_bw_dl() later on, but we need + * to check if the CFS+RT+DL sum is saturated (ie. no idle time) such + * that we select f_max when there is no idle time. + * + * NOTE: numerical errors or stop class might cause us to not quite hit + * saturation when we should -- something for later. + */ + if (util + dl_util >= max) + return max; + + /* + * OTOH, for energy computation we need the estimated running time, so + * include util_dl and ignore dl_bw. + */ + if (type == ENERGY_UTIL) + util += dl_util; + + /* + * There is still idle time; further improve the number by using the + * irq metric. Because IRQ/steal time is hidden from the task clock we + * need to scale the task numbers: + * + * max - irq + * U' = irq + --------- * U + * max + */ + util = scale_irq_capacity(util, irq, max); + util += irq; + + /* + * Bandwidth required by DEADLINE must always be granted while, for + * FAIR and RT, we use blocked utilization of IDLE CPUs as a mechanism + * to gracefully reduce the frequency when no tasks show up for longer + * periods of time. + * + * Ideally we would like to set bw_dl as min/guaranteed freq and util + + * bw_dl as requested freq. However, cpufreq is not yet ready for such + * an interface. So, we only do the latter for now. + */ + if (type == FREQUENCY_UTIL) + util += cpu_bw_dl(rq); + + return min(max, util); +} + +unsigned long sched_cpu_util(int cpu, enum cpu_util_type type, + unsigned long max) +{ + return effective_cpu_util(cpu, cpu_util_cfs(cpu_rq(cpu)), max, type, + NULL); +} + /** * find_process_by_pid - find a process with a matching PID value. * @pid: the pid in question. diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 5ae7b4e6e8d6..0c5c61a095f6 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -169,122 +169,12 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy, return cpufreq_driver_resolve_freq(policy, freq); } -/* - * This function computes an effective utilization for the given CPU, to be - * used for frequency selection given the linear relation: f = u * f_max. - * - * The scheduler tracks the following metrics: - * - * cpu_util_{cfs,rt,dl,irq}() - * cpu_bw_dl() - * - * Where the cfs,rt and dl util numbers are tracked with the same metric and - * synchronized windows and are thus directly comparable. - * - * The cfs,rt,dl utilization are the running times measured with rq->clock_task - * which excludes things like IRQ and steal-time. These latter are then accrued - * in the irq utilization. - * - * The DL bandwidth number otoh is not a measured metric but a value computed - * based on the task model parameters and gives the minimal utilization - * required to meet deadlines. - */ -unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs, - unsigned long max, enum schedutil_type type, - struct task_struct *p) -{ - unsigned long dl_util, util, irq; - struct rq *rq = cpu_rq(cpu); - - if (!uclamp_is_used() && - type == FREQUENCY_UTIL && rt_rq_is_runnable(&rq->rt)) { - return max; - } - - /* - * Early check to see if IRQ/steal time saturates the CPU, can be - * because of inaccuracies in how we track these -- see - * update_irq_load_avg(). - */ - irq = cpu_util_irq(rq); - if (unlikely(irq >= max)) - return max; - - /* - * Because the time spend on RT/DL tasks is visible as 'lost' time to - * CFS tasks and we use the same metric to track the effective - * utilization (PELT windows are synchronized) we can directly add them - * to obtain the CPU's actual utilization. - * - * CFS and RT utilization can be boosted or capped, depending on - * utilization clamp constraints requested by currently RUNNABLE - * tasks. - * When there are no CFS RUNNABLE tasks, clamps are released and - * frequency will be gracefully reduced with the utilization decay. - */ - util = util_cfs + cpu_util_rt(rq); - if (type == FREQUENCY_UTIL) - util = uclamp_rq_util_with(rq, util, p); - - dl_util = cpu_util_dl(rq); - - /* - * For frequency selection we do not make cpu_util_dl() a permanent part - * of this sum because we want to use cpu_bw_dl() later on, but we need - * to check if the CFS+RT+DL sum is saturated (ie. no idle time) such - * that we select f_max when there is no idle time. - * - * NOTE: numerical errors or stop class might cause us to not quite hit - * saturation when we should -- something for later. - */ - if (util + dl_util >= max) - return max; - - /* - * OTOH, for energy computation we need the estimated running time, so - * include util_dl and ignore dl_bw. - */ - if (type == ENERGY_UTIL) - util += dl_util; - - /* - * There is still idle time; further improve the number by using the - * irq metric. Because IRQ/steal time is hidden from the task clock we - * need to scale the task numbers: - * - * max - irq - * U' = irq + --------- * U - * max - */ - util = scale_irq_capacity(util, irq, max); - util += irq; - - /* - * Bandwidth required by DEADLINE must always be granted while, for - * FAIR and RT, we use blocked utilization of IDLE CPUs as a mechanism - * to gracefully reduce the frequency when no tasks show up for longer - * periods of time. - * - * Ideally we would like to set bw_dl as min/guaranteed freq and util + - * bw_dl as requested freq. However, cpufreq is not yet ready for such - * an interface. So, we only do the latter for now. - */ - if (type == FREQUENCY_UTIL) - util += cpu_bw_dl(rq); - - return min(max, util); -} - static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu) { - struct rq *rq = cpu_rq(sg_cpu->cpu); - unsigned long util = cpu_util_cfs(rq); - unsigned long max = arch_scale_cpu_capacity(sg_cpu->cpu); - - sg_cpu->max = max; - sg_cpu->bw_dl = cpu_bw_dl(rq); + sg_cpu->max = arch_scale_cpu_capacity(sg_cpu->cpu); + sg_cpu->bw_dl = cpu_bw_dl(cpu_rq(sg_cpu->cpu)); - return schedutil_cpu_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL, NULL); + return sched_cpu_util(sg_cpu->cpu, FREQUENCY_UTIL, sg_cpu->max); } /** diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index aa4c6227cd6d..52e2d866e875 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6499,7 +6499,7 @@ compute_energy(struct task_struct *p, int dst_cpu, struct perf_domain *pd) * is already enough to scale the EM reported power * consumption at the (eventually clamped) cpu_capacity. */ - sum_util += schedutil_cpu_util(cpu, util_cfs, cpu_cap, + sum_util += effective_cpu_util(cpu, util_cfs, cpu_cap, ENERGY_UTIL, NULL); /* @@ -6509,7 +6509,7 @@ compute_energy(struct task_struct *p, int dst_cpu, struct perf_domain *pd) * NOTE: in case RT tasks are running, by default the * FREQUENCY_UTIL's utilization can be max OPP. */ - cpu_util = schedutil_cpu_util(cpu, util_cfs, cpu_cap, + cpu_util = effective_cpu_util(cpu, util_cfs, cpu_cap, FREQUENCY_UTIL, tsk); max_util = max(max_util, cpu_util); } @@ -6607,7 +6607,7 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu) * IOW, placing the task there would make the CPU * overutilized. Take uclamp into account to see how * much capacity we can get out of the CPU; this is - * aligned with schedutil_cpu_util(). + * aligned with sched_cpu_util(). */ util = uclamp_rq_util_with(cpu_rq(cpu), util, p); if (!fits_capacity(util, cpu_cap)) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index df80bfcea92e..0f0439344eec 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2486,25 +2486,8 @@ static inline unsigned long capacity_orig_of(int cpu) } #endif -/** - * enum schedutil_type - CPU utilization type - * @FREQUENCY_UTIL: Utilization used to select frequency - * @ENERGY_UTIL: Utilization used during energy calculation - * - * The utilization signals of all scheduling classes (CFS/RT/DL) and IRQ time - * need to be aggregated differently depending on the usage made of them. This - * enum is used within schedutil_freq_util() to differentiate the types of - * utilization expected by the callers, and adjust the aggregation accordingly. - */ -enum schedutil_type { - FREQUENCY_UTIL, - ENERGY_UTIL, -}; - -#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL - -unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs, - unsigned long max, enum schedutil_type type, +unsigned long effective_cpu_util(int cpu, unsigned long util_cfs, + unsigned long max, enum cpu_util_type type, struct task_struct *p); static inline unsigned long cpu_bw_dl(struct rq *rq) @@ -2533,14 +2516,6 @@ static inline unsigned long cpu_util_rt(struct rq *rq) { return READ_ONCE(rq->avg_rt.util_avg); } -#else /* CONFIG_CPU_FREQ_GOV_SCHEDUTIL */ -static inline unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs, - unsigned long max, enum schedutil_type type, - struct task_struct *p) -{ - return 0; -} -#endif /* CONFIG_CPU_FREQ_GOV_SCHEDUTIL */ #ifdef CONFIG_HAVE_SCHED_AVG_IRQ static inline unsigned long cpu_util_irq(struct rq *rq) From patchwork Fri Oct 23 10:20:21 2020 Content-Type: text/plain; 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Fri, 23 Oct 2020 03:20:34 -0700 (PDT) From: Viresh Kumar To: Ingo Molnar , Peter Zijlstra , Vincent Guittot , Amit Daniel Kachhap , Daniel Lezcano , Viresh Kumar , Javi Merino , Zhang Rui , Amit Kucheria Cc: linux-kernel@vger.kernel.org, Quentin Perret , Lukasz Luba , linux-pm@vger.kernel.org Subject: [PATCH V2 2/2] thermal: cpufreq_cooling: Reuse sched_cpu_util() Date: Fri, 23 Oct 2020 15:50:21 +0530 Message-Id: <11e7c7dcb07ae258fa02e187c9697252f3835466.1603448113.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.25.0.rc1.19.g042ed3e048af In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Several parts of the kernel are already using the effective CPU utilization (as seen by the scheduler) to get the current load on the CPU, do the same here instead of depending on the idle time of the CPU, which isn't that accurate comparatively. Note that, this (and CPU frequency scaling in general) doesn't work that well with idle injection as that is done from rt threads and is counted as load while it tries to do quite the opposite. That should be solved separately though. Signed-off-by: Viresh Kumar --- drivers/thermal/cpufreq_cooling.c | 70 +++++++------------------------ 1 file changed, 16 insertions(+), 54 deletions(-) diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c index cc2959f22f01..1315e4d4758b 100644 --- a/drivers/thermal/cpufreq_cooling.c +++ b/drivers/thermal/cpufreq_cooling.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -38,16 +39,6 @@ * ... */ -/** - * struct time_in_idle - Idle time stats - * @time: previous reading of the absolute time that this cpu was idle - * @timestamp: wall time of the last invocation of get_cpu_idle_time_us() - */ -struct time_in_idle { - u64 time; - u64 timestamp; -}; - /** * struct cpufreq_cooling_device - data for cooling device with cpufreq * @id: unique integer value corresponding to each cpufreq_cooling_device @@ -62,7 +53,6 @@ struct time_in_idle { * registered cooling device. * @policy: cpufreq policy. * @node: list_head to link all cpufreq_cooling_device together. - * @idle_time: idle time stats * @qos_req: PM QoS contraint to apply * * This structure is required for keeping information of each registered @@ -76,7 +66,6 @@ struct cpufreq_cooling_device { struct em_perf_domain *em; struct cpufreq_policy *policy; struct list_head node; - struct time_in_idle *idle_time; struct freq_qos_request qos_req; }; @@ -132,34 +121,18 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, } /** - * get_load() - get load for a cpu since last updated - * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu + * get_load() - get current load for a cpu * @cpu: cpu number - * @cpu_idx: index of the cpu in time_in_idle* * - * Return: The average load of cpu @cpu in percentage since this - * function was last called. + * Return: The current load of cpu @cpu in percentage. */ -static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, - int cpu_idx) +static u32 get_load(int cpu) { - u32 load; - u64 now, now_idle, delta_time, delta_idle; - struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; - - now_idle = get_cpu_idle_time(cpu, &now, 0); - delta_idle = now_idle - idle_time->time; - delta_time = now - idle_time->timestamp; + unsigned long max = arch_scale_cpu_capacity(cpu); + unsigned long util; - if (delta_time <= delta_idle) - load = 0; - else - load = div64_u64(100 * (delta_time - delta_idle), delta_time); - - idle_time->time = now_idle; - idle_time->timestamp = now; - - return load; + util = sched_cpu_util(cpu, ENERGY_UTIL, max); + return (util * 100) / max; } /** @@ -191,13 +164,12 @@ static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, * Instead, we calculate the current power on the assumption that the * immediate future will look like the immediate past. * - * We use the current frequency and the average load since this - * function was last called. In reality, there could have been - * multiple opps since this function was last called and that affects - * the load calculation. While it's not perfectly accurate, this - * simplification is good enough and works. REVISIT this, as more - * complex code may be needed if experiments show that it's not - * accurate enough. + * We use the current frequency and the current load. In reality, + * there could have been multiple opps since this function was last + * called and that affects the load calculation. While it's not + * perfectly accurate, this simplification is good enough and works. + * REVISIT this, as more complex code may be needed if experiments show + * that it's not accurate enough. * * Return: 0 on success, -E* if getting the static power failed. */ @@ -223,7 +195,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, u32 load; if (cpu_online(cpu)) - load = get_load(cpufreq_cdev, cpu, i); + load = get_load(cpu); else load = 0; @@ -517,13 +489,6 @@ __cpufreq_cooling_register(struct device_node *np, cpufreq_cdev->policy = policy; num_cpus = cpumask_weight(policy->related_cpus); - cpufreq_cdev->idle_time = kcalloc(num_cpus, - sizeof(*cpufreq_cdev->idle_time), - GFP_KERNEL); - if (!cpufreq_cdev->idle_time) { - cdev = ERR_PTR(-ENOMEM); - goto free_cdev; - } /* max_level is an index, not a counter */ cpufreq_cdev->max_level = i - 1; @@ -531,7 +496,7 @@ __cpufreq_cooling_register(struct device_node *np, ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); if (ret < 0) { cdev = ERR_PTR(ret); - goto free_idle_time; + goto free_cdev; } cpufreq_cdev->id = ret; @@ -580,8 +545,6 @@ __cpufreq_cooling_register(struct device_node *np, freq_qos_remove_request(&cpufreq_cdev->qos_req); remove_ida: ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); -free_idle_time: - kfree(cpufreq_cdev->idle_time); free_cdev: kfree(cpufreq_cdev); return cdev; @@ -674,7 +637,6 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) thermal_cooling_device_unregister(cdev); freq_qos_remove_request(&cpufreq_cdev->qos_req); ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); - kfree(cpufreq_cdev->idle_time); kfree(cpufreq_cdev); } EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);