回覆： [Xen-devel] A domain id 0x00007fff in the result of xentrace

["Tommy Huang" <nbp0204@xxxxxxxxx>]

Thanks for the information. I used "0x00007fff" to search so I didn't
find any result :-(.
Does it mean that the scheduler schedules this IDLE_DOMAIN when the
vcpu yields voluntarily?
I saw this idle_domain was scheduled pretty frequently.
In what situation the scheduler will schedule this idle domain?
Thanks.

- T.H.

2008/11/29, James Harper <james.harper@xxxxxxxxxxxxxxxx>:
>> Hi,
>>
>> When I used xentrace to get all domain events, I found that the xen
>> scheduler periodically scheduled a domain with id 0x00007fff. However,
>> that domain didn't issue any hypercall or exception. Because I didn't
>> create any domain only the default dom0, I supposed I could only see
> dom0.
>> Does anyone know what that domain is? I search the id "0x00007fff" in
> all
>> xen source files but didn't find any result. Any information is
>> appreciated. Thanks in advance.
>>
>
> A quick grep for 0x7fff in the sources for the hypervisor says:
>
> #define IDLE_DOMAIN_ID   (0x7FFFU)
> #define is_idle_domain(d) ((d)->domain_id == IDLE_DOMAIN_ID)
> #define is_idle_vcpu(v)   (is_idle_domain((v)->domain))
>
> Does this limit us to 32766 DomU's before we need a reboot to reset the
> id count?
>
> James
>

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