Re: [PATCH v21 1/4] mm: add VM_DROPPABLE for designating always lazily freeable mappings

[Jason A. Donenfeld]

Hi Linus,

On Sun, Jul 07, 2024 at 05:08:29PM -0700, Linus Torvalds wrote:
>    +                    vm_flags |= VM_DROPPABLE;
>    +                    vm_flags |= VM_WIPEONFORK | VM_DONTDUMP;
> which looks rather simple.

That is nice, though I would add that if we're implying things that are
sensible to imply, it really also needs to add VM_NORESERVE too.
DROPPABLE doesn't make sense semantically without it.

Anyway, rather than adding PROT_xyz for v+1, I'll try adding this
MAP_DROPPABLE (or a different name for David) with the implications as
you've suggested.

Jason