Re: [PATCH V2 3/5] kvm/ppc/book3s_hv: Implement halt polling in the kvm_hv kernel module

On 11/07/2016 18:57, David Matlack wrote:

On Mon, Jul 11, 2016 at 12:08 AM, Suraj Jitindar Singh
[off-list ref] wrote:

quoted

This patch introduces new halt polling functionality into the kvm_hv kernel
module. When a vcore is idle it will poll for some period of time before
scheduling itself out.

Is there any way to reuse the existing halt-polling code? Having two
copies risks them diverging over time.

s/risks/guarantees/ :(

Unfortunately, handling of the hardware threads in KVM PPC is a mess,
and I don't think it's possible to remove the duplication.

Paolo