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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>
hifive-unleashed-5.1
Rusty Russell 2007-07-20 22:15:01 +10:00 committed by Linus Torvalds
parent 876be9d89e
commit 9d1ca6f13c
1 changed files with 8 additions and 1 deletions
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9
drivers/lguest/lguest.c
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@ -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);