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

[张伟 <zhangwqh@xxxxxxx>]

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. 

Now I am confused with it.

If someone knows the answer, please let me know. Thank you in advance!

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