From 05aa026a62d0fe0b4664a01d1537984b12567e7c Mon Sep 17 00:00:00 2001 From: Tony Breeds Date: Mon, 22 Oct 2007 10:56:25 +1000 Subject: 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 Signed-off-by: Rusty Russell diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index c9ca610..8e9e485 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); -- cgit v0.10.2