Commit 5b9fe759 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

timekeeping: Maintain ktime_t based offsets for hrtimers 



We need to update the hrtimer clock offsets from the hrtimer interrupt
context. To avoid conversions from timespec to ktime_t maintain a
ktime_t based representation of those offsets in the timekeeper. This
puts the conversion overhead into the code which updates the
underlying offsets and provides fast accessible values in the hrtimer
interrupt.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarJohn Stultz <johnstul@us.ibm.com>
Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarPrarit Bhargava <prarit@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1341960205-56738-4-git-send-email-johnstul@us.ibm.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4873fa07

kernel/time/timekeeping.c

+23 −2
Original line number Diff line number Diff line
@@ -70,6 +70,12 @@ struct timekeeper { 
	/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */

	struct timespec raw_time;



	/* Offset clock monotonic -> clock realtime */

	ktime_t offs_real;



	/* Offset clock monotonic -> clock boottime */

	ktime_t offs_boot;



	/* Seqlock for all timekeeper values */

	seqlock_t lock;

};
@@ -172,6 +178,14 @@ static inline s64 timekeeping_get_ns_raw(void) 
	return clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);

}



static void update_rt_offset(void)

{

	struct timespec tmp, *wtm = &timekeeper.wall_to_monotonic;



	set_normalized_timespec(&tmp, -wtm->tv_sec, -wtm->tv_nsec);

	timekeeper.offs_real = timespec_to_ktime(tmp);

}



/* must hold write on timekeeper.lock */

static void timekeeping_update(bool clearntp)

{
@@ -179,6 +193,7 @@ static void timekeeping_update(bool clearntp) 
		timekeeper.ntp_error = 0;

		ntp_clear();

	}

	update_rt_offset();

	update_vsyscall(&timekeeper.xtime, &timekeeper.wall_to_monotonic,

			 timekeeper.clock, timekeeper.mult);

}
@@ -604,6 +619,7 @@ void __init timekeeping_init(void) 
	}

	set_normalized_timespec(&timekeeper.wall_to_monotonic,

				-boot.tv_sec, -boot.tv_nsec);

	update_rt_offset();

	timekeeper.total_sleep_time.tv_sec = 0;

	timekeeper.total_sleep_time.tv_nsec = 0;

	write_sequnlock_irqrestore(&timekeeper.lock, flags);
@@ -612,6 +628,12 @@ void __init timekeeping_init(void) 
/* time in seconds when suspend began */

static struct timespec timekeeping_suspend_time;



static void update_sleep_time(struct timespec t)

{

	timekeeper.total_sleep_time = t;

	timekeeper.offs_boot = timespec_to_ktime(t);

}



/**

 * __timekeeping_inject_sleeptime - Internal function to add sleep interval

 * @delta: pointer to a timespec delta value
@@ -630,8 +652,7 @@ static void __timekeeping_inject_sleeptime(struct timespec *delta) 
	timekeeper.xtime = timespec_add(timekeeper.xtime, *delta);

	timekeeper.wall_to_monotonic =

			timespec_sub(timekeeper.wall_to_monotonic, *delta);

	timekeeper.total_sleep_time = timespec_add(

					timekeeper.total_sleep_time, *delta);

	update_sleep_time(timespec_add(timekeeper.total_sleep_time, *delta));

}

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