TT#101150 add min/max/avg tracking for gauge stats

Change-Id: I6a682f2bb98673361a8454f419f8a0fb7d37ef75

daemon/call.c

@@ -64,6 +64,8 @@ struct xmlrpc_helper {
 
 
 struct global_stats_gauge rtpe_stats_gauge;
+struct global_stats_gauge_min_max rtpe_stats_gauge_graphite_min_max;
+
 struct global_stats_ax rtpe_stats;
 struct global_stats_counter rtpe_stats_interval;
 struct global_stats_counter rtpe_stats_cumulative;

include/call.h

@@ -542,14 +542,17 @@ extern GHashTable *rtpe_callhash;
 extern struct call_iterator_list rtpe_call_iterators[NUM_CALL_ITERATORS];
 
 extern struct global_stats_gauge rtpe_stats_gauge;
+extern struct global_stats_gauge_min_max rtpe_stats_gauge_graphite_min_max;
 
 #define RTPE_GAUGE_SET(field, num) \
 	do { \
 		atomic64_set(&rtpe_stats_gauge.field, num); \
+		RTPE_GAUGE_SET_MIN_MAX(field, rtpe_stats_gauge_graphite_min_max, num); \
 	} while (0)
 #define RTPE_GAUGE_ADD(field, num) \
 	do { \
-		atomic64_add(&rtpe_stats_gauge.field, num); \
+		uint64_t __old = atomic64_add(&rtpe_stats_gauge.field, num); \
+		RTPE_GAUGE_SET_MIN_MAX(field, rtpe_stats_gauge_graphite_min_max, __old + num); \
 	} while (0)
 #define RTPE_GAUGE_INC(field) RTPE_GAUGE_ADD(field, 1)
 #define RTPE_GAUGE_DEC(field) RTPE_GAUGE_ADD(field, -1)

include/statistics.h

@@ -26,6 +26,13 @@ struct global_stats_gauge {
 #undef F
 };
 
+struct global_stats_gauge_min_max {
+	struct global_stats_gauge min;
+	struct global_stats_gauge max;
+	struct global_stats_gauge avg; // sum while accumulation is running
+	struct global_stats_gauge count;
+};
+
 // "counter" style stats that are incremental and are kept cumulative or per-interval
 struct global_stats_counter {
 #define F(x) atomic64 x;
@@ -177,6 +184,14 @@ INLINE void stats_counters_min_max_reset(struct global_stats_min_max *mm, struct
 #undef F
 }
 
+#define RTPE_GAUGE_SET_MIN_MAX(field, min_max_struct, val) \
+	do { \
+		atomic64_min(&min_max_struct.min.field, val); \
+		atomic64_max(&min_max_struct.max.field, val); \
+		atomic64_add(&min_max_struct.avg.field, val); \
+		atomic64_inc(&min_max_struct.count.field); \
+	} while (0)
+
 void statistics_init(void);
 void statistics_free(void);