Re: [PATCH 6/6] userfaultfd: collapse VM_UFFD_{MISSING,WP,MINOR,RWP} into single VM_UFFD

[David Hildenbrand (Arm)]

On 8/27/26 13:18, Lorenzo Stoakes (ARM) wrote:
> On Thu, Aug 27, 2026 at 12:16:32PM +0100, Lorenzo Stoakes (ARM) wrote:
>> So actually you're increasing by a cacheline and increasing the VMA size by
>> 64 bytes, i.e. 1/3, which is unacceptable obviously.
>>
>> Maybe there's something that can be done with:
>>
>> 		/* forced alignments: 1 */
>>
>> Perhaps? But that looks potentially ugly.
>>
> 
> I say elsewhere (or think I do) but to highlight - I think probably we could fix
> this by putting the flags in the low bits of vm_uffd_state.ctx?

if that's possible that would be clearly preferable memory-wise.

-- 
Cheers,

David