linux/arch/x86/kernel/cpu/sched.c
Peter Zijlstra 7c423e9885 sched: x86: Name old_perf in a unique way
Silly percpu bits don't respect static..

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
2009-09-16 11:21:07 +02:00

56 lines
1.1 KiB
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