Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9d1ca6f13cfedfd127f3be7e447bd6d922806a65
Commit:     9d1ca6f13cfedfd127f3be7e447bd6d922806a65
Parent:     876be9d89e9c8a007577e6372e331042edf4020b
Author:     Rusty Russell <[EMAIL PROTECTED]>
AuthorDate: Fri Jul 20 22:15:01 2007 +1000
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Jul 20 09:05:16 2007 -0700

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 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);
 
-
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