Re: [PATCH RFC] kvm: x86: add halt_poll module parameter

[Paolo Bonzini <pbonzini@redhat.com>]

On 05/02/2015 20:23, Rik van Riel wrote:
>> > 3) long term anyway we want it to auto tune, which is better than tuning
>> > it per-VM.
> We may want to auto tune it per VM.

We may even want to auto tune it per VCPU.

> However, if we make auto tuning work well, I do not
> think we want to expose a user visible tunable per
> VM, and commit to keeping that kind of interface
> around forever.

Exactly.  We probably want module parameters to tune the minimum/maximum
values (which includes the special cases of disabling polling
altogether, and disabling the autotuning while leaving polling enabled),
but committing to a per-VM interface is premature.

Paolo