[PATCH v2 0/4] ext4: Improve parallel I/O performance on NVDIMM

Waiman Long
2016-04-08T16:16:44Z

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 fast storage devices like NVDIMM. It also introduces a
set of percpu statistics count helper functions that facilitate the
management of percpu statistics counts.

Patch 1 provides a set of simple percpu statistics count helper
functions.

Patch 2 enables the use of 64-bit counts for 32-bit architectures.

Patch 3 eliminates duplicated inode_dio_begin()/inode_dio_end() calls.

Patch 4 converts some ext4 statistics counts into percpu counts using
the helper functions.

Waiman Long (4):
percpu_stats: Simple per-cpu statistics count helper functions
percpu_stats: Enable 64-bit counts in 32-bit architectures
ext4: Pass in DIO_SKIP_DIO_COUNT flag if inode_dio_begin() called
ext4: Make cache hits/misses per-cpu counts

fs/ext4/extents_status.c | 22 ++++---
fs/ext4/extents_status.h | 11 +++-
fs/ext4/indirect.c | 10 +++-
fs/ext4/inode.c | 12 +++-
include/linux/percpu_stats.h | 64 +++++++++++++++++++++
lib/Makefile | 2 +-
lib/percpu_stats.c | 128 ++++++++++++++++++++++++++++++++++++++++++
7 files changed, 232 insertions(+), 17 deletions(-)
create mode 100644 include/linux/percpu_stats.h
create mode 100644 lib/percpu_stats.c