Hi all, This patchset improves the performance of xfile-backed btrees by teaching the buffer cache to directly map pages from the xfile. It also speeds up xfarray operations substantially by implementing a small page cache to avoid repeated kmap/kunmap calls. Collectively, these can reduce the runtime of online repair functions by twenty percent or so. If you're going to start using this code, I strongly recommend pulling from my git trees, which are linked below. This has been running on the djcloud for months with no problems. Enjoy! Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=xfile-page-caching xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=xfile-page-caching --- fs/xfs/libxfs/xfs_btree_mem.h | 6 + fs/xfs/libxfs/xfs_rmap_btree.c | 1 fs/xfs/scrub/rcbag_btree.c | 1 fs/xfs/scrub/trace.h | 44 ++++++ fs/xfs/scrub/xfbtree.c | 23 +++ fs/xfs/scrub/xfile.c | 307 ++++++++++++++++++++++++++-------------- fs/xfs/scrub/xfile.h | 23 +++ fs/xfs/xfs_buf.c | 116 ++++++++++++--- fs/xfs/xfs_buf.h | 16 ++ fs/xfs/xfs_buf_xfile.c | 173 +++++++++++++++++++++++ fs/xfs/xfs_buf_xfile.h | 11 + 11 files changed, 584 insertions(+), 137 deletions(-)
