linux-kernel - [PATCH v4 0/2] ext4: Improve parallel I/O performance on NVDIMM

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Message-Id: <1460746992-1443-1-git-send-email-Waiman.Long@hpe.com>
Date:	Fri, 15 Apr 2016 15:03:10 -0400
From:	Waiman Long <Waiman.Long@....com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
	Dave Chinner <david@...morbit.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Toshimitsu Kani <toshi.kani@....com>,
	Waiman Long <Waiman.Long@....com>
Subject: [PATCH v4 0/2] ext4: Improve parallel I/O performance on NVDIMM

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 eliminates duplicated inode_dio_begin()/inode_dio_end()
calls in dax_do_io().

Patch 2 converts some ext4 statistics counts into percpu counts using
the helper functions.

Waiman Long (2):
  ext4: Add DIO_SKIP_DIO_COUNT flag to dax_do_io()
  ext4: Make cache hits/misses per-cpu counts

 fs/ext4/extents_status.c |   38 +++++++++++++++++++++++++++++---------
 fs/ext4/extents_status.h |    4 ++--
 fs/ext4/indirect.c       |    9 ++++++++-
 fs/ext4/inode.c          |   11 ++++++++---
 4 files changed, 47 insertions(+), 15 deletions(-)