On 7 Mar 2025, at 12:39, Zi Yan wrote: > This is a preparation patch, both added functions are not used yet. > > The added __split_unmapped_folio() is able to split a folio with its > mapping removed in two manners: 1) uniform split (the existing way), and > 2) buddy allocator like (or non-uniform) split. > > The added __split_folio_to_order() can split a folio into any lower order. > For uniform split, __split_unmapped_folio() calls it once to split the > given folio to the new order. For buddy allocator like (non-uniform) > split, __split_unmapped_folio() calls it (folio_order - new_order) times > and each time splits the folio containing the given page to one lower > order. > > Signed-off-by: Zi Yan <ziy@xxxxxxxxxx> > Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> > Cc: David Hildenbrand <david@xxxxxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: John Hubbard <jhubbard@xxxxxxxxxx> > Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> > Cc: Kirill A. Shuemov <kirill.shutemov@xxxxxxxxxxxxxxx> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> > Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx> > Cc: Ryan Roberts <ryan.roberts@xxxxxxx> > Cc: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx> > Cc: Yu Zhao <yuzhao@xxxxxxxxxx> > Cc: Kairui Song <kasong@xxxxxxxxxxx> > --- > mm/huge_memory.c | 348 ++++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 347 insertions(+), 1 deletion(-) Hi Andrew, The patch below should fix the issues discovered by Hugh. Please fold it into this patch. Thank you for all the help.
