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@xxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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