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Re: [Xen-devel] [PATCH 1/2] cpu steal time accounting
| To: | Dan Hecht <dhecht@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 1/2] cpu steal time accounting |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 23 Feb 2006 08:40:43 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 23 Feb 2006 08:42:37 +0000 |
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On 22 Feb 2006, at 23:58, Dan Hecht wrote: To solve this, it may be best to have the hypervisor interface expose per-vcpu stolen time directly, rather than vcpu_time. Then the guest does not need to try to guess whether to charge (system_time - vcpu_time) against idle or steal. Yes, the distinction between stolen and available time does makes sense (although I'm not sure 'available' is a great name) otherwise you can't account for wakeup latencies. account_steal_time() would need to be modified in Linux, though, as we would not need its dodgy heuristic for deciding whether to account to stolen time or iowait/idle. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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