Re: [PATCH v2] mm/uffd: UFFD_FEATURE_WP_UNPOPULATED

[David Hildenbrand]

On 02.03.23 14:57, Peter Xu wrote:
> On Thu, Mar 02, 2023 at 10:37:44AM +0100, David Hildenbrand wrote:
> > Especially for such large sparse VMAs, the current way of allocating
> > pagetables to place markers/zeropages is far from optimal.
>
> IMHO that's not a generic workload.  As mentioned in the reply there, I
> would suggest we go with simple then we have space to optimize it in the
> future if necessary, because the API will be the same.

I disagree with "generic workload", we use sparse mmaps all over the 
place, and when blindly used by e.g., CRIU, we'll simply end up wasting 
memory and time.

But I already agreed that this optimization that is a separate thing to 
implement.

--
Thanks,

David / dhildenb