Re: [Xen-devel] [patch 30/44] xen: Add support for preemption

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

tgh wrote:
> hi
> I am using xen,and I am curious about whether Xen support the preempt
> scheduler for the VMs or not
> could the VM be prempted by xen to scheduler another VM?
>   

Yes, that's the normal mode of operation. The hypervisor will timeslice
multiple vcpus onto a single vcpu.

This patch doesn't relate to that; it's whether a Xen Linux guest's
kernel can be preempted to reschedule processes while running under Xen.
The normal xen-unstable or vendor Xen kernels don't support this, but
the mainline kernel with paravirt_ops/xen support does.

J

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