This RFC patch series attempts to simplify the page cache code by removing special casing code for hugetlb pages. Normal pages in the page cache are indexed by PAGE_SIZE while hugetlb pages are indexed by their huge page size. This was previously tried but the xarray was not performant enough for the changes. This series fails many of the hugetlb LTP test cases due to bugs in accounting and I was hoping to get help/suggestions about why the page accounting breaks from my changes. The basic mmap tests pass but the advanced ones which involve overcommiting pages fail. rebased on mm-unstable 4/13/2023 Sidhartha Kumar (4): mm/filemap: remove hugetlb special casing in filemap.c mm/hugetlb: remove hugetlb_basepage_index() mm/hugetlbfs: remove huge_page_shift in hugetlbfs_file_mmap mm/hugetlb: add hpage_shift to alloc_hugetlb_folio fs/hugetlbfs/inode.c | 4 +-- include/linux/pagemap.h | 13 -------- mm/filemap.c | 36 +++++++--------------- mm/hugetlb.c | 68 ++++++++++++----------------------------- 4 files changed, 33 insertions(+), 88 deletions(-) -- 2.39.2
