This patchset aims to improve parallel I/O performance of the ext4 filesystem on fast storage devices like NVDIMM.
Patch 1 eliminates duplicated inode_dio_begin()/inode_dio_end() calls. Patch 2 provides a set of simple percpu statistics count helper functions. Patch 3 converts some ext4 statistics counts into percpu counts using the helper functions. Waiman Long (3): ext4: Pass in DIO_SKIP_DIO_COUNT flag if inode_dio_begin() called percpu_stats: Simple per-cpu statistics count helper functions ext4: Make cache hits/misses per-cpu counts fs/ext4/extents_status.c | 20 +++++--- fs/ext4/extents_status.h | 11 ++++- fs/ext4/indirect.c | 10 +++- fs/ext4/inode.c | 12 ++++- include/linux/percpu_stats.h | 103 ++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 141 insertions(+), 15 deletions(-) create mode 100644 include/linux/percpu_stats.h
