On Fri, Jul 14, 2023 at 10:17 AM Ryan Roberts <ryan.roberts@xxxxxxx> wrote: > > arch_wants_pte_order() can be overridden by the arch to return the > preferred folio order for pte-mapped memory. This is useful as some > architectures (e.g. arm64) can coalesce TLB entries when the physical > memory is suitably contiguous. > > The first user for this hint will be FLEXIBLE_THP, which aims to > allocate large folios for anonymous memory to reduce page faults and > other per-page operation costs. > > Here we add the default implementation of the function, used when the > architecture does not define it, which returns -1, implying that the HW > has no preference. In this case, mm will choose it's own default order. > > Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx> Reviewed-by: Yu Zhao <yuzhao@xxxxxxxxxx> Thanks: -1 actually is better than 0 (what I suggested) for the obvious reason.
