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/incore.h | |
| parent | 2b1caf6ed7b888c95a1909d343799672731651a5 (diff) | |
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/incore.h')
| -rw-r--r-- | fs/gfs2/incore.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index a79790c0627..720c1e66b34 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -15,6 +15,8 @@ #include <linux/workqueue.h> #include <linux/dlm.h> #include <linux/buffer_head.h> +#include <linux/rcupdate.h> +#include <linux/rculist_bl.h> #define DIO_WAIT 0x00000010 #define DIO_METADATA 0x00000020 @@ -201,7 +203,7 @@ enum { }; struct gfs2_glock { - struct hlist_node gl_list; + struct hlist_bl_node gl_list; unsigned long gl_flags; /* GLF_... */ struct lm_lockname gl_name; atomic_t gl_ref; @@ -234,6 +236,7 @@ struct gfs2_glock { atomic_t gl_ail_count; struct delayed_work gl_work; struct work_struct gl_delete; + struct rcu_head gl_rcu; }; #define GFS2_MIN_LVB_SIZE 32 /* Min size of LVB that gfs2 supports */ |