[Xen-devel] Scheduling in domain

["Ashish Puri" <ashish.xen@xxxxxxxxx>]

Hi,

 

I have few doubts regarding the process scheduling in the domains.

 

1. In Xen 3.0 is guest aware of virtual time?? I see in the Xen 2.0 code that domain_time is present in the shared info pages. However i could not find similar field in the Xen 3.0 code.

 

2. If not, how is domain expected to do the "fair" scheduling/accounting for the processes running in the domain?? If vcpu is descheduled and later when it is rescheduled i see in the code that it will simply call do_timer() multiple times, in guest, to account for the "missing time" and update the jiffies multiple time. Also, the scduler_tick() is called repetedly. My question is: isn't this wrong, in the sense that process might not have run for its allocated time??? Am i missing something??

 

3. If yes, how it is used to do fair scheduling??

 

Thanks and Regards,

Ashish.

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