Re: [kvm-devel] [PATCH] export notifier #1

[Avi K. <av...@qu...>]

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.