1 files changed, 53 insertions, 0 deletions

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 14c937d345cb..8f946f614f8e 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -9,6 +9,7 @@
 #define __LINUX_LOCKDEP_H
 
 struct task_struct;
+struct lockdep_map;
 
 #ifdef CONFIG_LOCKDEP
 
@@ -114,8 +115,32 @@ struct lock_class {
 
         const char                      *name;
         int                             name_version;
+
+#ifdef CONFIG_LOCK_STAT
+        unsigned long                   contention_point[4];
+#endif
+};
+
+#ifdef CONFIG_LOCK_STAT
+struct lock_time {
+        s64                             min;
+        s64                             max;
+        s64                             total;
+        unsigned long                   nr;
 };
 
+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;
+};
+
+struct lock_class_stats lock_stats(struct lock_class *class);
+void clear_lock_stats(struct lock_class *class);
+#endif
+
 /*
  * Map the lock object (the lock instance) to the lock-class object.
  * This is embedded into specific lock instances:
@@ -165,6 +190,10 @@ struct held_lock {
         unsigned long                   acquire_ip;
         struct lockdep_map              *instance;
 
+#ifdef CONFIG_LOCK_STAT
+        u64                             waittime_stamp;
+        u64                             holdtime_stamp;
+#endif
         /*
          * The lock-stack is unified in that the lock chains of interrupt
          * contexts nest ontop of process context chains, but we 'separate'
@@ -281,6 +310,30 @@ struct lock_class_key { };
 
 #endif /* !LOCKDEP */
 
+#ifdef CONFIG_LOCK_STAT
+
+extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
+extern void lock_acquired(struct lockdep_map *lock);
+
+#define LOCK_CONTENDED(_lock, try, lock)                        \
+do {                                                            \
+        if (!try(_lock)) {                                      \
+                lock_contended(&(_lock)->dep_map, _RET_IP_);    \
+                lock(_lock);                                    \
+                lock_acquired(&(_lock)->dep_map);               \
+        }                                                       \
+} while (0)
+
+#else /* CONFIG_LOCK_STAT */
+
+#define lock_contended(lockdep_map, ip) do {} while (0)
+#define lock_acquired(lockdep_map) do {} while (0)
+
+#define LOCK_CONTENDED(_lock, try, lock) \
+        lock(_lock)
+
+#endif /* CONFIG_LOCK_STAT */
+
 #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
 extern void early_init_irq_lock_class(void);
 #else