diff options
| -rw-r--r-- | include/linux/lockdep.h | 17 | ||||
| -rw-r--r-- | kernel/lockdep.c | 38 | ||||
| -rw-r--r-- | kernel/lockdep_proc.c | 19 | ||||
| -rw-r--r-- | kernel/mutex.c | 2 |
4 files changed, 55 insertions, 21 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 3d3386b88b6..0e843bf6587 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -130,12 +130,24 @@ struct lock_time { unsigned long nr; }; +enum bounce_type { + bounce_acquired_write, + bounce_acquired_read, + bounce_contended_write, + bounce_contended_read, + nr_bounce_types, + + bounce_acquired = bounce_acquired_write, + bounce_contended = bounce_contended_write, +}; + struct lock_class_stats { unsigned long contention_point[4]; struct lock_time read_waittime; struct lock_time write_waittime; struct lock_time read_holdtime; struct lock_time write_holdtime; + unsigned long bounces[nr_bounce_types]; }; struct lock_class_stats lock_stats(struct lock_class *class); @@ -150,6 +162,9 @@ struct lockdep_map { struct lock_class_key *key; struct lock_class *class_cache; const char *name; +#ifdef CONFIG_LOCK_STAT + int cpu; +#endif }; /* @@ -321,8 +336,8 @@ do { \ if (!try(_lock)) { \ lock_contended(&(_lock)->dep_map, _RET_IP_); \ lock(_lock); \ - lock_acquired(&(_lock)->dep_map); \ } \ + lock_acquired(&(_lock)->dep_map); \ } while (0) #else /* CONFIG_LOCK_STAT */ diff --git a/kernel/lockdep.c b/kernel/lockdep.c index cb64022851c..156fce4960c 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -177,6 +177,9 @@ struct lock_class_stats lock_stats(struct lock_class *class) lock_time_add(&pcs->read_holdtime, &stats.read_holdtime); lock_time_add(&pcs->write_holdtime, &stats.write_holdtime); + + for (i = 0; i < ARRAY_SIZE(stats.bounces); i++) + stats.bounces[i] += pcs->bounces[i]; } return stats; @@ -2325,6 +2328,9 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name, lock->name = name; lock->key = key; lock->class_cache = NULL; +#ifdef CONFIG_LOCK_STAT + lock->cpu = raw_smp_processor_id(); +#endif if (subclass) register_lock_class(lock, subclass, 1); } @@ -2775,6 +2781,8 @@ found_it: stats = get_lock_stats(hlock->class); if (point < ARRAY_SIZE(stats->contention_point)) stats->contention_point[i]++; + if (lock->cpu != smp_processor_id()) + stats->bounces[bounce_contended + !!hlock->read]++; put_lock_stats(stats); } @@ -2786,8 +2794,8 @@ __lock_acquired(struct lockdep_map *lock) struct lock_class_stats *stats; unsigned int depth; u64 now; - s64 waittime; - int i; + s64 waittime = 0; + int i, cpu; depth = curr->lockdep_depth; if (DEBUG_LOCKS_WARN_ON(!depth)) @@ -2809,19 +2817,25 @@ __lock_acquired(struct lockdep_map *lock) return; found_it: - if (!hlock->waittime_stamp) - return; - - now = sched_clock(); - waittime = now - hlock->waittime_stamp; - hlock->holdtime_stamp = now; + cpu = smp_processor_id(); + if (hlock->waittime_stamp) { + now = sched_clock(); + waittime = now - hlock->waittime_stamp; + hlock->holdtime_stamp = now; + } stats = get_lock_stats(hlock->class); - if (hlock->read) - lock_time_inc(&stats->read_waittime, waittime); - else - lock_time_inc(&stats->write_waittime, waittime); + if (waittime) { + if (hlock->read) + lock_time_inc(&stats->read_waittime, waittime); + else + lock_time_inc(&stats->write_waittime, waittime); + } + if (lock->cpu != cpu) + stats->bounces[bounce_acquired + !!hlock->read]++; put_lock_stats(stats); + + lock->cpu = cpu; } void lock_contended(struct lockdep_map *lock, unsigned long ip) diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c index 39163ed1bf0..7ff80135cbe 100644 --- a/kernel/lockdep_proc.c +++ b/kernel/lockdep_proc.c @@ -430,16 +430,18 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data) else seq_printf(m, "%40s:", name); + seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); seq_lock_time(m, &stats->write_waittime); - seq_puts(m, " "); + seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); seq_lock_time(m, &stats->write_holdtime); seq_puts(m, "\n"); } if (stats->read_holdtime.nr) { seq_printf(m, "%38s-R:", name); + seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); seq_lock_time(m, &stats->read_waittime); - seq_puts(m, " "); + seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); seq_lock_time(m, &stats->read_holdtime); seq_puts(m, "\n"); } @@ -469,26 +471,29 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data) } if (i) { seq_puts(m, "\n"); - seq_line(m, '.', 0, 40 + 1 + 8 * (14 + 1)); + seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); seq_puts(m, "\n"); } } static void seq_header(struct seq_file *m) { - seq_printf(m, "lock_stat version 0.1\n"); - seq_line(m, '-', 0, 40 + 1 + 8 * (14 + 1)); - seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s\n", + seq_printf(m, "lock_stat version 0.2\n"); + seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); + seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " + "%14s %14s\n", "class name", + "con-bounces", "contentions", "waittime-min", "waittime-max", "waittime-total", + "acq-bounces", "acquisitions", "holdtime-min", "holdtime-max", "holdtime-total"); - seq_line(m, '-', 0, 40 + 1 + 8 * (14 + 1)); + seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); seq_printf(m, "\n"); } diff --git a/kernel/mutex.c b/kernel/mutex.c index 7a3f32761f2..691b86564dd 100644 --- a/kernel/mutex.c +++ b/kernel/mutex.c @@ -180,8 +180,8 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass) spin_lock_mutex(&lock->wait_lock, flags); } - lock_acquired(&lock->dep_map); done: + lock_acquired(&lock->dep_map); /* got the lock - rejoice! */ mutex_remove_waiter(lock, &waiter, task_thread_info(task)); debug_mutex_set_owner(lock, task_thread_info(task)); |