On Thu, Jun 06, 2024 at 07:58:55PM +0800, Baolin Wang wrote: > In the following patches, shmem will support the swap out of large folios, > which means the shmem mappings may contain large order swap entries, so an > 'orders' array is added for find_get_entries() and find_lock_entries() to > obtain the order size of shmem swap entries, which will help in the release > of shmem large folio swap entries. I am not a fan. I was hoping that 'order' would be encoded in the swap entry, not passed as a separate parameter. As I understand it, we currently have a free bit, or swp_to_radix_entry() would not work. We can use that as detailed here to encode the order in a single bit. https://kernelnewbies.org/MatthewWilcox/NaturallyAlignedOrder
