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Re: [Xen-devel] Question about VCPU's and VM's Blocked state
| To: | Huibin QIAN <qianhb@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Question about VCPU's and VM's Blocked state |
| From: | George Dunlap <dunlapg@xxxxxxxxx> |
| Date: | Tue, 19 Jan 2010 11:25:24 +0000 |
| Cc: | q00147403@xxxxxxxxxxxxxxxxxxxx, cqj@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, g00138124@xxxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 19 Jan 2010 03:25:44 -0800 |
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2010/1/19 Huibin QIAN <qianhb@xxxxxxxxxx>: > I have some doubt about the vcpu scheduling in xen. > what would make the vcpu be blocked? > In HVM, does the hlt instruction make a vmexit and the hypervisor put the > vcpu into sleep queue? Or anything else causes it? What about the PV? HVM vcpus become blocked when they execute HLT. PV vcpus become blocked when they execute a SCHEDOP_block(). (See xen/common/schedule.c). By contrast, "offline" is the runstate that happens when the vcpu is not runnable for any other reason; for example: * While a domain is being constructed * An HVM domain waiting for qemu to finish an emulated instruction (IO or MMIO) * When a vcpu is flagged for scheduler migration to a different pcpu * When a vcpu is being paused for another reason, for example during live migration to another host. > When we use 'xm list' we can get the vm state ,usually it is blocked or > running, and what meaning is the blocked state? Not sure about this one. But there is no "sleep queue"; vcpus that are blocked are simply not on the run queue (or running). -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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