Re: [Xen-users] NOW() function the unit in xen scheduler

[jinho hwang <hwang.jinho@xxxxxxxxx>]

On Tue, Jul 9, 2013 at 9:30 AM, åä <zhangwqh@xxxxxxx> wrote:
> Hi, all
>
> In xen code, some place will call NOW() function. Now I do not know how to
> know the unit for this function.
> There are two places given the definition for this function NOW()
> one is xen-4.2.1/extras/mini-os/include/Time.h
> In this file  xen-4.2.1/extras/mini-os/include/Time.h, from the comment
> NOW() the unit for time is
> /*System Time
> 64 bit value containing the nanoseconds elapsed since boot time.*/
> the other is xen-4.2.1/xen/include/xen/Time.h
> In xen schedule related places, they call the function NOW() in the
> xen-4.2.1/xen/include/xen/Time.h.
>
> At first, I think  NOW() the unit for time in
> xen-4.2.1/xen/include/xen/Time.h file, should also nanosecond.
> However, From here,
> set_timer(&spc->ticker, NOW() + MICROSECS(prv->tick_period_us) ); In the
> function csched_alloc_pdata(), it seems the unit is microsecs.

#define MICROSECS(_us)          (((s_time_t)(_us)) * 1000UL )

To nanosecond...

>
> Now I am confused with it.
>
> If someone knows the answer, please let me know. Thank you in advance!
>
>
>
>
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