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authorTony Breeds <tony@bakeyournoodle.com>2007-10-22 10:56:25 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:49 +1000
commit05aa026a62d0fe0b4664a01d1537984b12567e7c (patch)
tree76fad2d7d091ca2532237ba4a5ddc877348e2a91 /drivers/lguest/lguest.c
parentebac52524df31e7c2fe13ca5bd3438907842f763 (diff)
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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: Tony Breeds <tony@bakeyournoodle.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lguest.c')
-rw-r--r--drivers/lguest/lguest.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c
index c9ca610f4996..8e9e485a5cfa 100644
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -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);