lockstat: human readability tweaks

[firefly-linux-kernel-4.4.55.git] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 70ca4db28affad40a94e55d7fe7f5e62dac27f1f..a8dc99d9fef7566a48884d7d9ae1b2a177c27906 100644 (file)
--- 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];