Re: [PATCH 1/2] mm: compaction: limit the suitable target page order to be less than cc->order

[Mel Gorman]

On Mon, Jan 22, 2024 at 09:01:53PM +0800, Baolin Wang wrote:
> It can not improve the fragmentation if we isolate the target free pages
> exceeding cc->order, especially when the cc->order is less than pageblock_order.
> For example, suppose the pageblock_order is MAX_ORDER (size is 4M) and cc->order
> is 2M THP size, we should not isolate other 2M free pages to be the migration
> target, which can not improve the fragmentation.
> 
> Moreover this is also applicable for large folio compaction.
> 
> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>

Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>

-- 
Mel Gorman
SUSE Labs