diff options
Diffstat (limited to 'kernel/lockdep.c')
-rw-r--r-- | kernel/lockdep.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 70ca4db..a8dc99d 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -149,6 +149,50 @@ static void lock_time_inc(struct lock_time *lt, s64 time) lt->nr++; } +static inline void lock_time_add(struct lock_time *src, struct lock_time *dst) +{ + dst->min += src->min; + dst->max += src->max; + dst->total += src->total; + dst->nr += src->nr; +} + +struct lock_class_stats lock_stats(struct lock_class *class) +{ + struct lock_class_stats stats; + int cpu, i; + + memset(&stats, 0, sizeof(struct lock_class_stats)); + for_each_possible_cpu(cpu) { + struct lock_class_stats *pcs = + &per_cpu(lock_stats, cpu)[class - lock_classes]; + + for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++) + stats.contention_point[i] += pcs->contention_point[i]; + + lock_time_add(&pcs->read_waittime, &stats.read_waittime); + lock_time_add(&pcs->write_waittime, &stats.write_waittime); + + lock_time_add(&pcs->read_holdtime, &stats.read_holdtime); + lock_time_add(&pcs->write_holdtime, &stats.write_holdtime); + } + + return stats; +} + +void clear_lock_stats(struct lock_class *class) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct lock_class_stats *cpu_stats = + &per_cpu(lock_stats, cpu)[class - lock_classes]; + + memset(cpu_stats, 0, sizeof(struct lock_class_stats)); + } + memset(class->contention_point, 0, sizeof(class->contention_point)); +} + static struct lock_class_stats *get_lock_stats(struct lock_class *class) { return &get_cpu_var(lock_stats)[class - lock_classes]; |