On 2025/5/15 11:22, Nico Pache wrote:
khugepaged scans anons PMD ranges for potential collapse to a hugepage. To add mTHP support we use this scan to instead record chunks of utilized sections of the PMD. khugepaged_scan_bitmap uses a stack struct to recursively scan a bitmap that represents chunks of utilized regions. We can then determine what mTHP size fits best and in the following patch, we set this bitmap while scanning the anon PMD. A minimum collapse order of 2 is used as this is the lowest order supported by anon memory. max_ptes_none is used as a scale to determine how "full" an order must be before being considered for collapse. When attempting to collapse an order that has its order set to "always" lets always collapse to that order in a greedy manner without considering the number of bits set. Signed-off-by: Nico Pache <npa...@redhat.com>
Sigh. You still haven't addressed or explained the issues I previously raised [1], so I don't know how to review this patch again...
[1] https://lore.kernel.org/all/83a66442-b7c7-42e7-af4e-fd211d8ed...@linux.alibaba.com/
