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[Xen-devel] Scheduling in domain
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] Scheduling in domain |
| From: | "Ashish Puri" <ashish.xen@xxxxxxxxx> |
| Date: | Mon, 25 Sep 2006 04:10:41 -0700 |
| Delivery-date: | Mon, 25 Sep 2006 04:11:15 -0700 |
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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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