Re: [PATCH mm-unstable v18 07/14] mm/khugepaged: skip collapsing mTHP to smaller orders

On 5/22/26 17:00, Nico Pache wrote:

khugepaged may try to collapse a mTHP to a smaller mTHP, resulting in
some pages being unmapped. 

The "some pages being unmapped" part is unclear.

I assume what you mean is "possibly resulting in a partially mapped source
folio, which is undesired."

But there is also the problem that we could try collapsing a folio to a
same-sized folio, which doesn't make sense (assuming the folio is fully mapped).

Clarify all that, please.

Acked-by: David Hildenbrand (arm) <david@kernel.org>

-- 
Cheers,

David