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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/incore.h
parent2b1caf6ed7b888c95a1909d343799672731651a5 (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.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index a79790c06275..720c1e66b343 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 */