[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


  • To: "Tommy Huang" <nbp0204@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Sun, 30 Nov 2008 14:50:22 +1100
  • Cc:
  • Delivery-date: Sat, 29 Nov 2008 19:50:53 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclSnIbdphjpIXngT+CoT1Ra7/34SAAAehUg
  • Thread-topic: [Xen-devel] 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.
> 

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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.