Xen devel - Nov 2008 - A domain id 0x00007fff in the result of xentrace

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.

Regards,
- T.H.


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> 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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On 30/11/08 03:50, "James Harper"
<james.harper@bendigoit.com.au> wrote:
> 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?
Domain IDs are reusable.

 -- Keir



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