[PATCH 0/3] ext4: Improve parallel I/O performance on NVDIMM

[Waiman Long]

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