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| author | Sunil Mushran <sunil.mushran@oracle.com> | 2010-12-28 23:26:03 -0800 |
|---|---|---|
| committer | Joel Becker <jlbec@evilplan.org> | 2011-02-20 03:56:07 -0800 |
| commit | 5bc970e803ad2b1f26771f39376a79dbf0f5bf64 (patch) | |
| tree | cc2c0dd4a49ddad9691d0ef0312475db76bc6464 /fs/ocfs2/ocfs2.h | |
| parent | 0cc9d5257857608ba85885b75fcada13d359b5d1 (diff) | |
| download | lwn-5bc970e803ad2b1f26771f39376a79dbf0f5bf64.tar.gz lwn-5bc970e803ad2b1f26771f39376a79dbf0f5bf64.zip | |
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.h | 23 |
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; |