diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-07-20 12:15:01 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-20 16:05:16 (GMT) |
| commit | 9d1ca6f13cfedfd127f3be7e447bd6d922806a65 (patch) | |
| tree | fb920888bce49f2bfa8c5a239e2c8c55dd9df7bd /drivers | |
| parent | 876be9d89e9c8a007577e6372e331042edf4020b (diff) | |
| download | linux-9d1ca6f13cfedfd127f3be7e447bd6d922806a65.tar.xz | |
lguest: override sched_clock
Guests currently use the default scheduler clock: this means they
always use jiffies even if TSC is actually available. It doesn't make
any noticeable difference here, but it's a better thing to do.
Also remove commented-out asm/sched-clock.h from -mm tree.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/lguest/lguest.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index b9a58b7..434fea1 100644 --- a/drivers/lguest/lguest.c +++ b/drivers/lguest/lguest.c @@ -39,7 +39,6 @@ #include <asm/e820.h> #include <asm/mce.h> #include <asm/io.h> -//#include <asm/sched-clock.h> /* Declarations for definitions in lguest_guest.S */ extern char lguest_noirq_start[], lguest_noirq_end[]; @@ -57,6 +56,7 @@ struct lguest_data lguest_data = { .blocked_interrupts = { 1 }, /* Block timer interrupts */ }; struct lguest_device_desc *lguest_devices; +static cycle_t clock_base; static enum paravirt_lazy_mode lazy_mode; static void lguest_lazy_mode(enum paravirt_lazy_mode mode) @@ -363,6 +363,11 @@ static struct clocksource lguest_clock = { .read = lguest_clock_read, }; +static unsigned long long lguest_sched_clock(void) +{ + return cyc2ns(&lguest_clock, lguest_clock_read() - clock_base); +} + /* We also need a "struct clock_event_device": Linux asks us to set it to go * off some time in the future. Actually, James Morris figured all this out, I * just applied the patch. */ @@ -439,6 +444,7 @@ static void lguest_time_init(void) lguest_clock.mult = (((u64)NSEC_PER_SEC<<8)/ACTHZ) << 8; lguest_clock.mask = CLOCKSOURCE_MASK(32); } + clock_base = lguest_clock_read(); clocksource_register(&lguest_clock); /* We can't set cpumask in the initializer: damn C limitations! */ @@ -584,6 +590,7 @@ __init void lguest_init(void *boot) paravirt_ops.time_init = lguest_time_init; paravirt_ops.set_lazy_mode = lguest_lazy_mode; paravirt_ops.wbinvd = lguest_wbinvd; + paravirt_ops.sched_clock = lguest_sched_clock; hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0); |