ocfs2: Use hrtimer to track ocfs2 fs lock stats
Patch makes use of the hrtimer to track times in ocfs2 lock stats.
The patch is a bit involved to ensure no additional impact on the memory
footprint. The size of ocfs2_inode_cache remains 1280 bytes on 32-bit systems.
A related change was to modify the unit of the max wait time from nanosec to
microsec allowing us to track max time larger than 4 secs. This change
necessitated the bumping of the output version in the debugfs file,
locking_state, from 2 to 3.
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 51cd689..4e3d3c13 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -147,6 +147,17 @@
typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
+#ifdef CONFIG_OCFS2_FS_STATS
+struct ocfs2_lock_stats {
+ u64 ls_total; /* Total wait in NSEC */
+ u32 ls_gets; /* Num acquires */
+ u32 ls_fail; /* Num failed acquires */
+
+ /* Storing max wait in usecs saves 24 bytes per inode */
+ u32 ls_max; /* Max wait in USEC */
+};
+#endif
+
struct ocfs2_lock_res {
void *l_priv;
struct ocfs2_lock_res_ops *l_ops;
@@ -182,15 +193,9 @@
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 */
+ struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */
+ u32 l_lock_refresh; /* Disk refreshes */
+ struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map l_lockdep_map;