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Date: Wed, 25 Nov 2020 16:39:01 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Juri Lelli <juri.lelli@...hat.com>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Quentin Perret <qperret@...gle.com>,
Lukasz Luba <lukasz.luba@....com>,
Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH V4 2/3] sched/core: Rename schedutil_cpu_util() and allow
rest of the kernel to use it
On Tue, Nov 24, 2020 at 7:26 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> There is nothing schedutil specific in schedutil_cpu_util(), rename it
> to effective_cpu_util(). Also create and expose another wrapper
> sched_cpu_util() which can be used by other parts of the kernel, like
> thermal core (that will be done in a later commit).
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
For the schedutil change:
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> include/linux/sched.h | 21 +++++++++++++++++++++
> kernel/sched/core.c | 11 +++++++++--
> kernel/sched/cpufreq_schedutil.c | 2 +-
> kernel/sched/fair.c | 6 +++---
> kernel/sched/sched.h | 19 ++-----------------
> 5 files changed, 36 insertions(+), 23 deletions(-)
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 063cd120b459..926b944dae5e 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1926,6 +1926,27 @@ extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
> #define TASK_SIZE_OF(tsk) TASK_SIZE
> #endif
>
> +#ifdef CONFIG_SMP
> +/**
> + * 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);
> +#endif /* CONFIG_SMP */
> +
> #ifdef CONFIG_RSEQ
>
> /*
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index b81265aec4a0..845c976ccd53 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -5138,8 +5138,8 @@ struct task_struct *idle_task(int cpu)
> * 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,
> +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;
> @@ -5223,6 +5223,13 @@ unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs,
>
> 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);
> +}
> #endif /* CONFIG_SMP */
>
> /**
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index 2d44befb322b..e71627a3792b 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -178,7 +178,7 @@ static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
> sg_cpu->max = max;
> sg_cpu->bw_dl = cpu_bw_dl(rq);
>
> - return schedutil_cpu_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL, NULL);
> + return effective_cpu_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL, NULL);
> }
>
> /**
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 290f9e38378c..0e1c8eb7ad53 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 0db6bcf0881f..4fab3b930ace 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -2485,23 +2485,8 @@ static inline unsigned long capacity_orig_of(int cpu)
> return cpu_rq(cpu)->cpu_capacity_orig;
> }
>
> -/**
> - * 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,
> -};
> -
> -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)
> --
> 2.25.0.rc1.19.g042ed3e048af
>
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