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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>
This commit is contained in:
Sunil Mushran
Joel Becker
parent
0cc9d52578
commit
5bc970e803
@ -64,7 +64,7 @@ struct ocfs2_mask_waiter {
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unsigned long mw_mask;
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unsigned long mw_goal;
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#ifdef CONFIG_OCFS2_FS_STATS
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unsigned long long mw_lock_start;
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ktime_t mw_lock_start;
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#endif
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};
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@ -435,44 +435,41 @@ static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
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#ifdef CONFIG_OCFS2_FS_STATS
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static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
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{
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res->l_lock_num_prmode = 0;
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res->l_lock_num_prmode_failed = 0;
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res->l_lock_total_prmode = 0;
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res->l_lock_max_prmode = 0;
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res->l_lock_num_exmode = 0;
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res->l_lock_num_exmode_failed = 0;
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res->l_lock_total_exmode = 0;
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res->l_lock_max_exmode = 0;
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res->l_lock_refresh = 0;
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memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats));
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memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats));
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}
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static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level,
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struct ocfs2_mask_waiter *mw, int ret)
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{
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unsigned long long *num, *sum;
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unsigned int *max, *failed;
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struct timespec ts = current_kernel_time();
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unsigned long long time = timespec_to_ns(&ts) - mw->mw_lock_start;
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u32 usec;
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ktime_t kt;
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struct ocfs2_lock_stats *stats;
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if (level == LKM_PRMODE) {
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num = &res->l_lock_num_prmode;
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sum = &res->l_lock_total_prmode;
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max = &res->l_lock_max_prmode;
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failed = &res->l_lock_num_prmode_failed;
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} else if (level == LKM_EXMODE) {
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num = &res->l_lock_num_exmode;
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sum = &res->l_lock_total_exmode;
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max = &res->l_lock_max_exmode;
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failed = &res->l_lock_num_exmode_failed;
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} else
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if (level == LKM_PRMODE)
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stats = &res->l_lock_prmode;
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else if (level == LKM_EXMODE)
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stats = &res->l_lock_exmode;
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else
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return;
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(*num)++;
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(*sum) += time;
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if (time > *max)
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*max = time;
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kt = ktime_sub(ktime_get(), mw->mw_lock_start);
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usec = ktime_to_us(kt);
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stats->ls_gets++;
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stats->ls_total += ktime_to_ns(kt);
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/* overflow */
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if (unlikely(stats->ls_gets) == 0) {
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stats->ls_gets++;
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stats->ls_total = ktime_to_ns(kt);
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}
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if (stats->ls_max < usec)
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stats->ls_max = usec;
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if (ret)
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(*failed)++;
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stats->ls_fail++;
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}
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static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
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@ -482,8 +479,7 @@ static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
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static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
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{
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struct timespec ts = current_kernel_time();
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mw->mw_lock_start = timespec_to_ns(&ts);
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mw->mw_lock_start = ktime_get();
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}
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#else
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static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
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@ -2869,8 +2865,15 @@ static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
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return iter;
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}
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/* So that debugfs.ocfs2 can determine which format is being used */
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#define OCFS2_DLM_DEBUG_STR_VERSION 2
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/*
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* Version is used by debugfs.ocfs2 to determine the format being used
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*
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* New in version 2
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* - Lock stats printed
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* New in version 3
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* - Max time in lock stats is in usecs (instead of nsecs)
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*/
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#define OCFS2_DLM_DEBUG_STR_VERSION 3
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static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
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{
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int i;
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@ -2912,18 +2915,18 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
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seq_printf(m, "0x%x\t", lvb[i]);
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#ifdef CONFIG_OCFS2_FS_STATS
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# define lock_num_prmode(_l) (_l)->l_lock_num_prmode
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# define lock_num_exmode(_l) (_l)->l_lock_num_exmode
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# define lock_num_prmode_failed(_l) (_l)->l_lock_num_prmode_failed
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# define lock_num_exmode_failed(_l) (_l)->l_lock_num_exmode_failed
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# define lock_total_prmode(_l) (_l)->l_lock_total_prmode
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# define lock_total_exmode(_l) (_l)->l_lock_total_exmode
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# define lock_max_prmode(_l) (_l)->l_lock_max_prmode
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# define lock_max_exmode(_l) (_l)->l_lock_max_exmode
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# define lock_refresh(_l) (_l)->l_lock_refresh
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# define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets)
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# define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets)
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# define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail)
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# define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail)
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# define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total)
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# define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total)
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# define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max)
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# define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max)
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# define lock_refresh(_l) ((_l)->l_lock_refresh)
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#else
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# define lock_num_prmode(_l) (0ULL)
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# define lock_num_exmode(_l) (0ULL)
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# define lock_num_prmode(_l) (0)
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# define lock_num_exmode(_l) (0)
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# define lock_num_prmode_failed(_l) (0)
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# define lock_num_exmode_failed(_l) (0)
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# define lock_total_prmode(_l) (0ULL)
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@ -2933,8 +2936,8 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
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# define lock_refresh(_l) (0)
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#endif
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/* The following seq_print was added in version 2 of this output */
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seq_printf(m, "%llu\t"
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"%llu\t"
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seq_printf(m, "%u\t"
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"%u\t"
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"%u\t"
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"%u\t"
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"%llu\t"
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@ -147,6 +147,17 @@ struct ocfs2_lock_res_ops;
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typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
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#ifdef CONFIG_OCFS2_FS_STATS
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struct ocfs2_lock_stats {
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u64 ls_total; /* Total wait in NSEC */
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u32 ls_gets; /* Num acquires */
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u32 ls_fail; /* Num failed acquires */
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/* Storing max wait in usecs saves 24 bytes per inode */
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u32 ls_max; /* Max wait in USEC */
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};
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#endif
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struct ocfs2_lock_res {
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void *l_priv;
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struct ocfs2_lock_res_ops *l_ops;
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@ -182,15 +193,9 @@ struct ocfs2_lock_res {
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struct list_head l_debug_list;
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#ifdef CONFIG_OCFS2_FS_STATS
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unsigned long long l_lock_num_prmode; /* PR acquires */
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unsigned long long l_lock_num_exmode; /* EX acquires */
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unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
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unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
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unsigned long long l_lock_total_prmode; /* Tot wait for PR */
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unsigned long long l_lock_total_exmode; /* Tot wait for EX */
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unsigned int l_lock_max_prmode; /* Max wait for PR */
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unsigned int l_lock_max_exmode; /* Max wait for EX */
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unsigned int l_lock_refresh; /* Disk refreshes */
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struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */
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u32 l_lock_refresh; /* Disk refreshes */
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struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map l_lockdep_map;
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