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Re: [Xen-devel] credit scheduler and HYPERVISOR_yield()
| To: | Emmanuel Ackaouy <ackaouy@xxxxxxxxx>, George Dunlap <gdunlap@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] credit scheduler and HYPERVISOR_yield() |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 15 Oct 2007 18:45:52 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, John Levon <levon@xxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 15 Oct 2007 10:41:22 -0700 |
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| Thread-topic: | [Xen-devel] credit scheduler and HYPERVISOR_yield() |
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On 15/10/07 18:13, "Emmanuel Ackaouy" <ackaouy@xxxxxxxxx> wrote: > In the case of IPIs, you're already going into the hypervisor so you > should be able to do something straightforward with a sleeping > semaphore. Maybe you spin a little before you sleep though to give > running VCPUs a chance to respond before you give up the end of > your time slice. Actually a blocking spinlock could be implemented with no Xen changes. Change the spinlock function in Linux to spin a few times and then set a waiting bit in a cpumask and then SCHEDOP_poll on a per-VCPU spinlock-wakeup event channel. On spin_unlock, the unlocker sends an event to any VCPU in the cpumask, using each VCPU's spinlock-wakeup event channel. Yes, this is probably nicer than using yield() and praying. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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