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Date: Mon, 30 Nov 2020 14:55:03 +0100
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Viresh Kumar <viresh.kumar@...aro.org>,
Quentin Perret <qperret@...gle.com>
Cc: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Juri Lelli <juri.lelli@...hat.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@...r.kernel.org, Lukasz Luba <lukasz.luba@....com>,
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 24/11/2020 14:22, Viresh Kumar wrote:
> On 24-11-20, 09:10, Quentin Perret wrote:
>> Hey Viresh,
>>
>> On Tuesday 24 Nov 2020 at 11:56:15 (+0530), Viresh Kumar 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>
>>> ---
>>> 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);
>>
>> Are 'type' and 'max' useful to anybody outside of kernel/sched ?
>> If not then how about we hide them, keep the cpu_util_type enum in
>> kernel/sched/sched.h and evaluate arch_scale_cpu_capacity() in
>> sched_cpu_util() directly?
>
> cpufreq_cooling uses 'max' (as can be seen in the next patch).
But the enum cpu_util_type type doesn't have to be exported outside the
task scheduler code?
--8<--
diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
index 5aff2ac4b77f..cd9d717654a8 100644
--- a/drivers/thermal/cpufreq_cooling.c
+++ b/drivers/thermal/cpufreq_cooling.c
@@ -149,7 +149,7 @@ static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu,
unsigned long max = arch_scale_cpu_capacity(cpu);
unsigned long util;
- util = sched_cpu_util(cpu, ENERGY_UTIL, max);
+ util = sched_cpu_util(cpu, max);
return (util * 100) / max;
}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index fcd70c075349..0511e4fb946f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1954,24 +1954,8 @@ extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
#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);
+unsigned long sched_cpu_util(int cpu, unsigned long max);
#endif /* CONFIG_SMP */
#ifdef CONFIG_RSEQ
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7f20dacc2fa7..270f10e01ad2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5757,11 +5757,10 @@ unsigned long effective_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)
+unsigned long sched_cpu_util(int cpu, unsigned long max)
{
- return effective_cpu_util(cpu, cpu_util_cfs(cpu_rq(cpu)), max, type,
- NULL);
+ return effective_cpu_util(cpu, cpu_util_cfs(cpu_rq(cpu)), max,
+ ENERGY_UTIL, NULL);
}
#endif /* CONFIG_SMP */
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b7611020d5cf..a49d6c3e9147 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2561,6 +2561,21 @@ static inline unsigned long capacity_orig_of(int cpu)
return cpu_rq(cpu)->cpu_capacity_orig;
}
+/**
+ * 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,
+};
+
unsigned long effective_cpu_util(int cpu, unsigned long util_cfs,
unsigned long max, enum cpu_util_type type,
struct task_struct *p);
--
2.17.1
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