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Subject[PATCH v5 0/2] ext4: Improve parallel I/O performance on NVDIMM
Date
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(-)

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