Re: [PATCH v2] mm/uffd: UFFD_FEATURE_WP_UNPOPULATED

[Peter Xu]

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.

If I want to monitor a super sparse VMA on dirty, one thing I can already
try is register with MISSING + WP (!WP_UNPOPULATED).  It may be a good
intermediate solution to avoid any marker ovearheads.

-- 
Peter Xu