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Commit 05aa026a authored by Tony Breeds's avatar Tony Breeds Committed by Rusty Russell
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Clocksource is continuous regardless of the state of the host's TSC. 



Currently lguest will spend a lot of of time waking up the host, as it
cannot go tickless (if the [host] TSC has been marked unstable). On my
laptop I was getting ~40% of wakeups from lguest.

With this patch applied, my laptop is much happier!

Signed-off-by: default avatarTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent ebac5252

drivers/lguest/lguest.c

+2 −3
Original line number Diff line number Diff line
@@ -679,6 +679,7 @@ static struct clocksource lguest_clock = { 
	.mask		= CLOCKSOURCE_MASK(64),

	.mult		= 1 << 22,

	.shift		= 22,

	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,

};



/* The "scheduler clock" is just our real clock, adjusted to start at zero */
@@ -760,11 +761,9 @@ static void lguest_time_init(void) 
	 * the TSC, otherwise it's a dumb nanosecond-resolution clock.  Either

	 * way, the "rating" is initialized so high that it's always chosen

	 * over any other clocksource. */

	if (lguest_data.tsc_khz) {

	if (lguest_data.tsc_khz)

		lguest_clock.mult = clocksource_khz2mult(lguest_data.tsc_khz,

							 lguest_clock.shift);

		lguest_clock.flags = CLOCK_SOURCE_IS_CONTINUOUS;

	}

	clock_base = lguest_clock_read();

	clocksource_register(&lguest_clock);