[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: CPU scheduling of domains and vcpus
Mike D. Day, le Mon 21 Apr 2008 16:32:18 -0400, a écrit : > On 21/04/08 18:56 +0100, Samuel Thibault wrote: > > Nauman Rafique, le Mon 21 Apr 2008 13:52:21 -0400, a écrit : > > > In fact, wasted cycles can probably be avoided by doing opportunisitic > > > gang scheduling (i.e. gang schedule, unless there would be wasted > > > cycles) > > > > How do you detect that there would be wasted cycles? > > The only way is for a very self-aware guest to use a paravirtual > feature to give a hint to the scheduler. Agreed :) > Alternatively, the scheduler can notify the guest that it is about to > be preempted by the hypervisor and now would be a good time to sleep > before gaining a contended spinlock. Mmm, "about to be" means "on the next tick" then. That may be a long time. Samuel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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