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

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