From: Abhijith Das <adas@redhat.com>
Date: Thu, 28 Aug 2008 10:18:23 -0500
Subject: [gfs2] multiple writer performance issue
Message-id: 48B6C1BF.3010603@redhat.com
O-Subject: [RHEL 5.3] GFS2: Multiple writer performance issue (bz #459738)
Bugzilla: 459738
RH-Acked-by: Bob Peterson <rpeterso@redhat.com>
RH-Acked-by: Steven Whitehouse <swhiteho@redhat.com>

This patch fixes the poor performance seen with gfs2 when multiple
writers (nodes) write to the filesystem.

Signed-off-by:   Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by:   Abhijith Das <adas@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 730f97a..4cafe8d 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1278,6 +1278,8 @@ static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
 	holdtime = gl->gl_tchange + gl->gl_ops->go_min_hold_time;
 	if (time_before(now, holdtime))
 		delay = holdtime - now;
+	if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags))
+		delay = gl->gl_ops->go_min_hold_time;
 
 	spin_lock(&gl->gl_spin);
 	handle_callback(gl, state, 1, delay);