diff options
| author | Steven Whitehouse <swhiteho@redhat.com> | 2011-01-19 09:30:01 +0000 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2011-01-21 09:39:08 +0000 |
| commit | bc015cb84129eb1451913cfebece270bf7a39e0f (patch) | |
| tree | 4f116a61b802d87ae80051e9ae05d8fcb73d9ae7 /fs/gfs2/ops_fstype.c | |
| parent | 2b1caf6ed7b888c95a1909d343799672731651a5 (diff) | |
| download | linux-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/ops_fstype.c')
| -rw-r--r-- | fs/gfs2/ops_fstype.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 777927ce6f790..a39c103ba4997 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -928,12 +928,9 @@ static const match_table_t nolock_tokens = { { Opt_err, NULL }, }; -static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl) +static void nolock_put_lock(struct gfs2_glock *gl) { - struct gfs2_sbd *sdp = gl->gl_sbd; - kmem_cache_free(cachep, gl); - if (atomic_dec_and_test(&sdp->sd_glock_disposal)) - wake_up(&sdp->sd_glock_wait); + call_rcu(&gl->gl_rcu, gfs2_glock_free); } static const struct lm_lockops nolock_ops = { |