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authorSunil Mushran <sunil.mushran@oracle.com>2010-12-29 10:26:03 +0300
committerJoel Becker <jlbec@evilplan.org>2011-02-20 14:56:07 +0300
commit5bc970e803ad2b1f26771f39376a79dbf0f5bf64 (patch)
treecc2c0dd4a49ddad9691d0ef0312475db76bc6464 /fs/ocfs2/ocfs2.h
parent0cc9d5257857608ba85885b75fcada13d359b5d1 (diff)
downloadlinux-5bc970e803ad2b1f26771f39376a79dbf0f5bf64.tar.xz
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>
Diffstat (limited to 'fs/ocfs2/ocfs2.h')
-rw-r--r--fs/ocfs2/ocfs2.h23
1 files changed, 14 insertions, 9 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 51cd6898e7f1..4e3d3c1363f3 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -147,6 +147,17 @@ struct ocfs2_lock_res_ops;
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 ocfs2_lock_res {
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;