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authorSteven Whitehouse <swhiteho@redhat.com>2011-01-19 09:30:01 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2011-01-21 09:39:08 +0000
commitbc015cb84129eb1451913cfebece270bf7a39e0f (patch)
tree4f116a61b802d87ae80051e9ae05d8fcb73d9ae7 /fs/gfs2/lops.c
parent2b1caf6ed7b888c95a1909d343799672731651a5 (diff)
downloadlinux-next-bc015cb84129eb1451913cfebece270bf7a39e0f.tar.gz
GFS2: Use RCU for glock hash table
This has a number of advantages: - Reduces contention on the hash table lock - Makes the code smaller and simpler - Should speed up glock dumps when under load - Removes ref count changing in examine_bucket - No longer need hash chain lock in glock_put() in common case There are some further changes which this enables and which we may do in the future. One is to look at using SLAB_RCU, and another is to look at using a per-cpu counter for the per-sb glock counter, since that is touched twice in the lifetime of each glock (but only used at umount time). Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'fs/gfs2/lops.c')
-rw-r--r--fs/gfs2/lops.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index bf33f822058d..11a73efa8261 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -91,7 +91,8 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
}
bd->bd_ail = ai;
list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
- clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+ if (test_and_clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags))
+ gfs2_glock_schedule_for_reclaim(bd->bd_gl);
trace_gfs2_pin(bd, 0);
gfs2_log_unlock(sdp);
unlock_buffer(bh);