https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: ddf28352b80c86754a6424e3a61e8bdf9213b3c7 authored by Linus Torvalds on 04 September 2011, 22:45:10 UTC
Linux 3.1-rc5
Linux 3.1-rc5
Tip revision: ddf2835
sched.c
#include <linux/sched.h>
#include <linux/math64.h>
#include <linux/percpu.h>
#include <linux/irqflags.h>
#include <asm/cpufeature.h>
#include <asm/processor.h>
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct aperfmperf, old_perf_sched);
static unsigned long scale_aperfmperf(void)
{
struct aperfmperf val, *old = &__get_cpu_var(old_perf_sched);
unsigned long ratio, flags;
local_irq_save(flags);
get_aperfmperf(&val);
local_irq_restore(flags);
ratio = calc_aperfmperf_ratio(old, &val);
*old = val;
return ratio;
}
unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu)
{
/*
* do aperf/mperf on the cpu level because it includes things
* like turbo mode, which are relevant to full cores.
*/
if (boot_cpu_has(X86_FEATURE_APERFMPERF))
return scale_aperfmperf();
/*
* maybe have something cpufreq here
*/
return default_scale_freq_power(sd, cpu);
}
unsigned long arch_scale_smt_power(struct sched_domain *sd, int cpu)
{
/*
* aperf/mperf already includes the smt gain
*/
if (boot_cpu_has(X86_FEATURE_APERFMPERF))
return SCHED_LOAD_SCALE;
return default_scale_smt_power(sd, cpu);
}
#endif