Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas

Michal Hocko
2021-02-09T13:25:22Z

On Tue 09-02-21 11:23:35, David Hildenbrand wrote:
[...]
> I am constantly trying to fight for making more stuff MOVABLE instead of
> going into the other direction (e.g., because it's easier to implement,
> which feels like the wrong direction).
>
> Maybe I am the only person that really cares about ZONE_MOVABLE these days
> :) I can't stop such new stuff from popping up, so at least I want it to be
> documented.

MOVABLE zone is certainly an important thing to keep working. And there
is still quite a lot of work on the way. But as I've said this is more
of a outlier than a norm. On the other hand movable zone is kinda hard
requirement for a lot of application and it is to be expected that
many features will be less than 100% compatible. Some usecases even
impossible. That's why I am arguing that we should have a central
document where the movable zone is documented with all the potential
problems we have encountered over time and explicitly state which
features are fully/partially incompatible.

--
Michal Hocko
SUSE Labs