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ia64/pv_ops/pv_time_ops: add sched_clock hook.

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add sched_clock() hook to paravirtualize sched_clock().
ia64 sched_clock() is based on ar.itc which isn't stable
on virtualized environment because vcpu may move around on
pcpus. So it needs paravirtualization.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata
2009-03-04 21:05:40 +09:00
committed by Tony Luck
parent 496203b15b
commit f927da1786
5 changed files with 26 additions and 2 deletions
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7
arch/ia64/include/asm/paravirt.h
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@@ -225,6 +225,8 @@ struct pv_time_ops {
int (*do_steal_accounting)(unsigned long *new_itm);
void (*clocksource_resume)(void);
unsigned long long (*sched_clock)(void);
};
extern struct pv_time_ops pv_time_ops;
@@ -242,6 +244,11 @@ paravirt_do_steal_accounting(unsigned long *new_itm)
return pv_time_ops.do_steal_accounting(new_itm);
}
static inline unsigned long long paravirt_sched_clock(void)
{
return pv_time_ops.sched_clock();
}
#endif /* !__ASSEMBLY__ */
#else