From: ZhangPeng <zhangpeng362@huawei.com> Backport page fault and fork optimization, including optimization for folio add and split, remove uffd_wp and anon/cow/shared fault optimization. We can get a 3% performance improvment for lmbench fork_proc and 1.5% for lmbench page_fault. Kairui Song (5): mm/filemap: return early if failed to allocate memory for split mm/filemap: clean up hugetlb exclusion code lib/xarray: introduce a new helper xas_get_order lib/xarray: introduce a new helper xas_get_order mm/filemap: optimize filemap folio adding Kefeng Wang (2): mm: memory: check userfaultfd_wp() in vmf_orig_pte_uffd_wp() mm: swapfile: check usable swap device in __folio_throttle_swaprate() include/linux/xarray.h | 6 +++ lib/test_xarray.c | 93 ++++++++++++++++++++++++++++++++++++++++++ lib/xarray.c | 49 ++++++++++++++-------- mm/filemap.c | 74 +++++++++++++++++++++------------ mm/memory.c | 10 ++--- mm/swapfile.c | 13 ++++-- 6 files changed, 194 insertions(+), 51 deletions(-) -- 2.25.1