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[CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand governor

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export get_cpu_idle_time_us() for it to be used in ondemand governor.
Last update time can be current time when the CPU is currently non-idle,
accounting for the busy time since last idle.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-08-04 11:59:11 -07:00 committed by Dave Jones
parent e9d95bf7eb
commit 8083e4ad97
2 changed files with 11 additions and 2 deletions
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2
include/linux/tick.h
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@ -126,7 +126,7 @@ static inline ktime_t tick_nohz_get_sleep_length(void)
return len;
}
static inline void tick_nohz_stop_idle(int cpu) { }
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return 0; }
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
# endif /* !NO_HZ */
#endif

11
kernel/time/tick-sched.c
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@ -20,6 +20,7 @@
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/module.h>
#include <asm/irq_regs.h>
@ -190,9 +191,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
*last_update_time = ktime_to_us(ts->idle_lastupdate);
if (!tick_nohz_enabled)
return -1;
if (ts->idle_active)
*last_update_time = ktime_to_us(ts->idle_lastupdate);
else
*last_update_time = ktime_to_us(ktime_get());
return ktime_to_us(ts->idle_sleeptime);
}
EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
/**
* tick_nohz_stop_sched_tick - stop the idle tick from the idle task