[PATCH 2/2] ocfs2: Instrument fs cluster locks

This patch adds code to track the number of times the fs takes
various cluster locks as well as the times associated with it.
The information is made available to users via debugfs.

This patch was originally written by Jan Kara <jack@suse.cz>.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 31692379c170..1cb814be8ef1 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -132,6 +132,18 @@ struct ocfs2_lock_res {
         wait_queue_head_t        l_event;
 
         struct list_head         l_debug_list;
+
+#ifdef CONFIG_OCFS2_FS_STATS
+        unsigned long long       l_lock_num_prmode;        /* PR acquires */
+        unsigned long long       l_lock_num_exmode;        /* EX acquires */
+        unsigned int             l_lock_num_prmode_failed; /* Failed PR gets */
+        unsigned int             l_lock_num_exmode_failed; /* Failed EX gets */
+        unsigned long long       l_lock_total_prmode;      /* Tot wait for PR */
+        unsigned long long       l_lock_total_exmode;      /* Tot wait for EX */
+        unsigned int             l_lock_max_prmode;        /* Max wait for PR */
+        unsigned int             l_lock_max_exmode;        /* Max wait for EX */
+        unsigned int             l_lock_refresh;           /* Disk refreshes */
+#endif
 };
 
 struct ocfs2_dlm_debug {