From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bob Peterson Date: Tue, 8 May 2018 15:04:30 -0500 Subject: [Cluster-devel] [PATCH 0/2] Improve throughput through rgrp sharing (v2) Message-ID: <20180508200432.24228-1-rpeterso@redhat.com> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi, On 18 April, I posted v1 of this patch set. The idea is to allow multiple processes on a node to share a glock that's held exclusively in order to improve performance. Sharing rgrps allows for better throughput by reducing contention. Version 1 implemented this by introducing a new glock mode for sharing glocks. Steve Whitehouse suggested we didn't need a new mode: we can accomplish the same thing just by having a new glock flag, which also makes the patch more simple. This version 2 patch set implements Steve's suggestion. The first patch introduces the new glock flag. The second patch puts it into use for rgrp sharing. Exclusive access to the rgrp is implemented through an rwsem. Performance testing using iozone looks even better than version 1. --- Bob Peterson (2): GFS2: Introduce GLF_EX_SHARING bit: local EX sharing GFS2: Take advantage of new EXSH glock mode for rgrps fs/gfs2/bmap.c | 2 +- fs/gfs2/dir.c | 2 +- fs/gfs2/glock.c | 23 ++++++++++--- fs/gfs2/glock.h | 4 +++ fs/gfs2/incore.h | 2 ++ fs/gfs2/inode.c | 7 ++-- fs/gfs2/rgrp.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++--------- fs/gfs2/rgrp.h | 2 +- fs/gfs2/super.c | 8 +++-- fs/gfs2/xattr.c | 8 +++-- 10 files changed, 129 insertions(+), 32 deletions(-) -- 2.14.3