Re: [v2 01/11] mm/zone_device: support large zone device private folios

[David Hildenbrand <david@redhat.com>]

On 05.08.25 06:22, Balbir Singh wrote:
> On 7/30/25 19:50, David Hildenbrand wrote:
> 
>> I think I asked that already but maybe missed the reply: Should these folios ever be added to the deferred split queue and is there any value in splitting them under memory pressure in the shrinker?
>>
>> My gut feeling is "No", because the buddy cannot make use of these folios, but maybe there is an interesting case where we want that behavior?
>>
> 
> I realized I did not answer this
> 
> deferred_split() is the default action when partial unmaps take place. Anything that does
> folio_rmap_remove_ptes can cause the folio to be deferred split if it gets partially
> unmapped.

Right, but it's easy to exclude zone-device folios here. So the real 
question is: do you want to deal with deferred splits or not?

If not, then just disable it right from the start.

-- 
Cheers,

David / dhildenb