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Commit 8083e4ad authored by venkatesh.pallipadi@intel.com's avatar venkatesh.pallipadi@intel.com Committed by Dave Jones
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[CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand governor 



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: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent e9d95bf7

include/linux/tick.h

+1 −1
Original line number Diff line number Diff line
@@ -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

kernel/time/tick-sched.c

+10 −1
Original line number Diff line number Diff line
@@ -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);



	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