Re: [PATCH 00/13] KVM: MMU: fast page fault

Avi Kivity
2012-04-17T14:56:54Z

On 04/17/2012 05:54 PM, Takuya Yoshikawa wrote:
> On Tue, 17 Apr 2012 15:41:39 +0300
> Avi Kivity <avi@redhat.com> wrote:
>
> > > Since there are many known algorithms to predict hot memory pages,
> > > the userspace will be able to tune the frequency of GET_DIRTY_LOG for such
> > > parts not to get too many faults repeatedly, if we can restrict the range
> > > of pages to protect.
> > >
> > > This is the fine-grained control.
> >
> > Do you want per-page control, or just range-based?
>
> Difficult question.
>
> For live migration, range-based control may be enough duo to the locality
> of WWS.

What's WWS?

I don't see a reason to assume locality in gpa space (or in gva space
either, for some workloads).

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