Re: [PATCH] export notifier #1

Avi Kivity
2008-01-25T06:35:56Z

Christoph Lameter wrote:
> On Thu, 24 Jan 2008, Andrea Arcangeli wrote:
>
>
>> I think you should consider if you can also build a rmap per-MM like
>> KVM does and index it by the virtual address like KVM does.
>>
>
> Yes we have that.
>
> If we have that then we do not need the mmu_notifier.
> We could call it with a page parameter and then walk the KVM or XPmem
> reverse map to directly find all the ptes we need to clear. There is no
> need then to add a new field to the mm_struct.
>

The reason the new field is needed is because the Linux mm does not
understand the secondary pte format and zapping protocol. Locating the
secondary ptes is just a part of the problem.

--
Any sufficiently difficult bug is indistinguishable from a feature.