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Clocksource is continuous regardless of the state of the host's TSC.

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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: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Tony Breeds 2007-10-22 10:56:25 +10:00 committed by Rusty Russell
parent ebac52524d
commit 05aa026a62
1 changed files with 2 additions and 3 deletions
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5
drivers/lguest/lguest.c
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@ -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);