Thank you very much! At first, I did not carefully read these macros and I have a misunderstanding- at first I thought these macros change the unit to related unit. Eg,
Thank you for your guidance. These macros change from the related unit to nano.
在 2013-07-09 21:53:31，"jinho hwang" <hwang.jinho@xxxxxxxxx> 写道：
>On Tue, Jul 9, 2013 at 9:30 AM, 张伟 <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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>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>
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