From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> This patchset gets a little further through xfstests than v4 did. It's still based on readahead_v11, and you can get it from http://git.infradead.org/users/willy/linux-dax.git/shortlog/refs/heads/xarray-pagecache if you'd rather see it there (this branch is force-pushed frequently) The primary idea here is that a large part of the overhead in dealing with individual pages is that there's just so darned many of them. We would be better off dealing with fewer, larger pages, even if they don't get to be the size necessary for the CPU to use a larger TLB entry. The approach taken is to make THPs support arbitrary power-of-two sizes (instead of just PMDs). There's probably some tuning to be done to decide what sizes are worth using, but we're a fair way from doing performance work with this patchset yet. TODO: - Rename hpage_nr_pages() to thp_count() - Maybe add a thp_mask() - Should flush_dcache_page() support THPs natively - Add Bill's SoB to all patches v5: - Add a mapping AS_LARGE_PAGES flag to reduce the levels of indirection (Dave Chinner) - Change iomap_invalidate_page() to handle subpages of a THP being punched - Ensure we don't call page_cache_async_readahead() with a tail page - Revert to Bill's original patch for thp_get_unmapped_area() to allow for hardware page sizes other than PMD to be supported more easily - Remove a few more HPAGE_PMD_NR - Move shmem_punch_compound() to truncate.c and rename it to punch_thp() - Add support for page_private to punch_thp() v4: - Fix thp_size typo - Fix the iomap page_mkwrite() path to operate on the head page, even though the vm_fault has a pointer to the tail page - Fix iomap_finish_ioend() to use bio_for_each_thp_segment_all() - Rework PageDoubleMap (see first two patches for details) - Fix page_cache_delete() to handle shadow entries being stored to a THP - Fix the assertion in pagecache_get_page() to handle tail pages - Change PageReadahead from NO_COMPOUND to ONLY_HEAD - Handle PageReadahead being set on head pages - Handle total_mapcount correctly (Kirill) - Pull the FS_LARGE_PAGES check out into mapping_large_pages() - Fix page size assumption in truncate_cleanup_page() - Avoid splitting large pages unnecessarily on truncate - Disable the page cache truncation introduced as part of the read-only THP patch set - Call compound_head() in iomap buffered write paths -- we retrieve a (potentially) tail page from the page cache and need to use that for flush_dcache_page(), but we expect to operate on a head page in most of the iomap code Kirill A. Shutemov (1): mm: Fix total_mapcount assumption of page size Matthew Wilcox (Oracle) (37): mm: Move PageDoubleMap bit mm: Simplify PageDoubleMap with PF_SECOND policy mm: Allow hpages to be arbitrary order mm: Introduce thp_size mm: Introduce thp_order mm: Introduce offset_in_thp fs: Add a filesystem flag for large pages fs: Do not update nr_thps for large page mappings fs: Introduce i_blocks_per_page fs: Make page_mkwrite_check_truncate thp-aware fs: Support THPs in zero_user_segments bio: Add bio_for_each_thp_segment_all iomap: Support arbitrarily many blocks per page iomap: Support large pages in iomap_adjust_read_range iomap: Support large pages in invalidatepage iomap: Support large pages in read paths iomap: Support large pages in write paths iomap: Inline data shouldn't see large pages iomap: Handle tail pages in iomap_page_mkwrite xfs: Support large pages mm: Make prep_transhuge_page return its argument mm: Add __page_cache_alloc_order mm: Allow large pages to be added to the page cache mm: Allow large pages to be removed from the page cache mm: Remove page fault assumption of compound page size mm: Remove assumptions of THP size mm: Avoid splitting large pages mm: Fix truncation for pages of arbitrary size mm: Handle truncates that split large pages mm: Support storing shadow entries for large pages mm: Support retrieving tail pages from the page cache mm: Support tail pages in wait_for_stable_page mm: Add DEFINE_READAHEAD mm: Make page_cache_readahead_unbounded take a readahead_control mm: Make __do_page_cache_readahead take a readahead_control mm: Allow PageReadahead to be set on head pages mm: Add large page readahead William Kucharski (1): mm: Align THP mappings for non-DAX drivers/nvdimm/btt.c | 4 +- drivers/nvdimm/pmem.c | 6 +- fs/ext4/verity.c | 4 +- fs/f2fs/verity.c | 4 +- fs/inode.c | 2 + fs/iomap/buffered-io.c | 127 ++++++++++++++++++-------------- fs/jfs/jfs_metapage.c | 2 +- fs/xfs/xfs_aops.c | 4 +- fs/xfs/xfs_super.c | 2 +- include/linux/bio.h | 13 ++++ include/linux/bvec.h | 23 ++++++ include/linux/fs.h | 28 +------ include/linux/highmem.h | 15 +++- include/linux/huge_mm.h | 25 +++++-- include/linux/mm.h | 97 +++++++++++++------------ include/linux/page-flags.h | 46 ++++-------- include/linux/pagemap.h | 97 ++++++++++++++++++++++--- mm/filemap.c | 91 +++++++++++++++-------- mm/highmem.c | 62 +++++++++++++++- mm/huge_memory.c | 38 +++++----- mm/internal.h | 15 ++-- mm/memory.c | 7 +- mm/page-writeback.c | 1 + mm/page_io.c | 2 +- mm/page_vma_mapped.c | 4 +- mm/readahead.c | 145 ++++++++++++++++++++++++++++--------- mm/rmap.c | 10 +-- mm/shmem.c | 30 +------- mm/truncate.c | 61 ++++++++++++++-- mm/vmscan.c | 5 +- 30 files changed, 633 insertions(+), 337 deletions(-) -- 2.26.2
