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| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2022-06-21 10:04:10 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-06-28 09:17:46 +0200 |
| commit | bb4479994945e9170534389a7762eb56149320ac (patch) | |
| tree | 949e049d67ea05825d5893bda35ddf8e4bd94040 /include/linux/sched.h | |
| parent | e2f3e35f1f5a4dccddf352cea534542544c9b867 (diff) | |
| download | linux-stable-bb4479994945e9170534389a7762eb56149320ac.tar.gz linux-stable-bb4479994945e9170534389a7762eb56149320ac.tar.bz2 linux-stable-bb4479994945e9170534389a7762eb56149320ac.zip | |
sched, drivers: Remove max param from effective_cpu_util()/sched_cpu_util()
effective_cpu_util() already has a `int cpu' parameter which allows to
retrieve the CPU capacity scale factor (or maximum CPU capacity) inside
this function via an arch_scale_cpu_capacity(cpu).
A lot of code calling effective_cpu_util() (or the shim
sched_cpu_util()) needs the maximum CPU capacity, i.e. it will call
arch_scale_cpu_capacity() already.
But not having to pass it into effective_cpu_util() will make the EAS
wake-up code easier, especially when the maximum CPU capacity reduced
by the thermal pressure is passed through the EAS wake-up functions.
Due to the asymmetric CPU capacity support of arm/arm64 architectures,
arch_scale_cpu_capacity(int cpu) is a per-CPU variable read access via
per_cpu(cpu_scale, cpu) on such a system.
On all other architectures it is a a compile-time constant
(SCHED_CAPACITY_SCALE).
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://lkml.kernel.org/r/20220621090414.433602-4-vdonnefort@google.com
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index c46f3a63b758..88b8817b827d 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2257,7 +2257,7 @@ static inline bool owner_on_cpu(struct task_struct *owner) } /* Returns effective CPU energy utilization, as seen by the scheduler */ -unsigned long sched_cpu_util(int cpu, unsigned long max); +unsigned long sched_cpu_util(int cpu); #endif /* CONFIG_SMP */ #ifdef CONFIG_RSEQ |