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From: Waiman Long <Waiman.Long@hpe.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org,
	linux-s390@vger.kernel.org, linux-arch@vger.kernel.org,
	xfs@oss.sgi.com, Davidlohr Bueso <dave@stgolabs.net>,
	Jason Low <jason.low2@hp.com>, Dave Chinner <david@fromorbit.com>,
	Scott J Norton <scott.norton@hpe.com>,
	Douglas Hatch <doug.hatch@hpe.com>,
	Waiman Long <Waiman.Long@hpe.com>
Subject: [RFC PATCH-tip 6/6] xfs: Enable reader optimistic spinning for DAX inodes
Date: Tue, 14 Jun 2016 14:12:39 -0400	[thread overview]
Message-ID: <1465927959-39719-7-git-send-email-Waiman.Long@hpe.com> (raw)
In-Reply-To: <1465927959-39719-1-git-send-email-Waiman.Long@hpe.com>

This patch enables reader optimistic spinning for inodes that are
under a DAX-based mount point.

On a 4-socket Haswell machine running on a 4.7-rc1 tip-based kernel,
the fio test with multithreaded randrw and randwrite tests on the
same file on a XFS partition on top of a NVDIMM with DAX were run,
the aggregated bandwidths before and after the patch were as follows:

  Test      BW before patch     BW after patch  % change
  ----      ---------------     --------------  --------
  randrw        1352 MB/s          2164 MB/s      +60%
  randwrite     1710 MB/s          2550 MB/s      +49%

Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
---
 fs/xfs/xfs_icache.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 99ee6ee..09f284f 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -71,6 +71,15 @@ xfs_inode_alloc(
 
 	mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
 
+	/*
+	 * Enable reader spinning for DAX nount point
+	 */
+	if (mp->m_flags & XFS_MOUNT_DAX) {
+		rwsem_set_rspin_threshold(&ip->i_iolock.mr_lock);
+		rwsem_set_rspin_threshold(&ip->i_mmaplock.mr_lock);
+		rwsem_set_rspin_threshold(&ip->i_lock.mr_lock);
+	}
+
 	/* initialise the xfs inode */
 	ip->i_ino = ino;
 	ip->i_mount = mp;
-- 
1.7.1

  parent reply	other threads:[~2016-06-14 18:13 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14 18:12 [RFC PATCH-tip 0/6] locking/rwsem: Enable reader optimistic spinning Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 1/6] locking/rwsem: Stop active read lock ASAP Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 2/6] locking/rwsem: Enable optional count-based spinning on reader Waiman Long
2016-06-14 18:27   ` Davidlohr Bueso
2016-06-14 19:11     ` Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 3/6] locking/rwsem: move down rwsem_down_read_failed function Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 4/6] locking/rwsem: Change RWSEM_WAITING_BIAS for better disambiguation Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 5/6] locking/rwsem: Enable spinning readers Waiman Long
2016-06-14 18:12 ` Waiman Long [this message]
2016-06-14 18:24   ` [RFC PATCH-tip 6/6] xfs: Enable reader optimistic spinning for DAX inodes Christoph Hellwig
2016-06-14 19:08     ` Waiman Long
2016-06-14 23:06   ` Dave Chinner
2016-06-15 18:55     ` Waiman Long

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