v4->v5: - Change patch 1 to disable i_dio_count update in do_dax_io(). v3->v4: - For patch 1, add the DIO_SKIP_DIO_COUNT flag to dax_do_io() calls only to address issue raised by Dave Chinner.
v2->v3: - Remove the percpu_stats helper functions and use percpu_counters instead. v1->v2: - Remove percpu_stats_reset() which is not really needed in this patchset. - Move some percpu_stats* functions to the newly created lib/percpu_stats.c. - Add a new patch to support 64-bit statistics counts in 32-bit architectures. - Rearrange the patches by moving the percpu_stats patches to the front followed by the ext4 patches. This patchset aims to improve parallel I/O performance of the ext4 filesystem on DAX. Patch 1 disables update of the i_dio_count as all DAX I/Os are synchronous and should be protected from whatever locking was done by the filesystem caller or within dax_do_io() for read (DIO_LOCKING). Patch 2 converts some ext4 statistics counts into percpu counts using the helper functions. Waiman Long (2): dax: Don't touch i_dio_count in dax_do_io() ext4: Make cache hits/misses per-cpu counts fs/dax.c | 14 ++++++-------- fs/ext4/extents_status.c | 38 +++++++++++++++++++++++++++++--------- fs/ext4/extents_status.h | 4 ++-- 3 files changed, 37 insertions(+), 19 deletions(-)
