Re: [PATCH] kvm: rename HINTS_DEDICATED to KVM_HINTS_REALTIME

Paolo Bonzini
2018-05-18T09:41:23Z

On 17/05/2018 20:46, Eduardo Habkost wrote:
> My understanding of the original patch is that the intention is
> to tell the guest that it is very unlikely to be preempted, so it
> can choose a more appropriate spinlock implementation. This
> description implies that the guest will never be preempted, which
> is much stronger guarantee.
>
> Isn't this new description incompatible with existing usage of
> the hint, which might include people who just use vCPU pinning
> but no mlock?

If you use hugetlbfs and vhost-user you don't really need mlock for the
QEMU process, do you? The QEMU process is not doing much in that case
and hugetlbfs gives you pinned memory automatically.

Paolo