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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>
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1 changed files with 8 additions and 1 deletions
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@ -39,7 +39,6 @@
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#include <asm/e820.h>
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#include <asm/mce.h>
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#include <asm/io.h>
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//#include <asm/sched-clock.h>
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/* Declarations for definitions in lguest_guest.S */
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extern char lguest_noirq_start[], lguest_noirq_end[];
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@ -57,6 +56,7 @@ struct lguest_data lguest_data = {
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.blocked_interrupts = { 1 }, /* Block timer interrupts */
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};
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struct lguest_device_desc *lguest_devices;
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static cycle_t clock_base;
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static enum paravirt_lazy_mode lazy_mode;
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static void lguest_lazy_mode(enum paravirt_lazy_mode mode)
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@ -363,6 +363,11 @@ static struct clocksource lguest_clock = {
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.read = lguest_clock_read,
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};
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static unsigned long long lguest_sched_clock(void)
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{
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return cyc2ns(&lguest_clock, lguest_clock_read() - clock_base);
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}
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/* We also need a "struct clock_event_device": Linux asks us to set it to go
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* off some time in the future. Actually, James Morris figured all this out, I
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* just applied the patch. */
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@ -439,6 +444,7 @@ static void lguest_time_init(void)
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lguest_clock.mult = (((u64)NSEC_PER_SEC<<8)/ACTHZ) << 8;
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lguest_clock.mask = CLOCKSOURCE_MASK(32);
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}
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clock_base = lguest_clock_read();
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clocksource_register(&lguest_clock);
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/* We can't set cpumask in the initializer: damn C limitations! */
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@ -584,6 +590,7 @@ __init void lguest_init(void *boot)
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paravirt_ops.time_init = lguest_time_init;
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paravirt_ops.set_lazy_mode = lguest_lazy_mode;
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paravirt_ops.wbinvd = lguest_wbinvd;
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paravirt_ops.sched_clock = lguest_sched_clock;
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hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0);
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