4471 DTrace count() with histogram
4472 DTrace full width distribution histograms
4473 DTrace frequency trails

@@ -351,10 +351,16 @@
  */
 
 #define DTRACE_A_PERCPU         0x0001
 #define DTRACE_A_KEEPDELTA      0x0002
 #define DTRACE_A_ANONYMOUS      0x0004
+#define DTRACE_A_TOTAL          0x0008
+#define DTRACE_A_MINMAXBIN      0x0010
+#define DTRACE_A_HASNEGATIVES   0x0020
+#define DTRACE_A_HASPOSITIVES   0x0040
+
+#define DTRACE_AGGZOOM_MAX              0.95    /* height of max bar */
 
 #define DTRACE_AGGWALK_ERROR            -1      /* error while processing */
 #define DTRACE_AGGWALK_NEXT             0       /* proceed to next element */
 #define DTRACE_AGGWALK_ABORT            1       /* abort aggregation walk */
 #define DTRACE_AGGWALK_CLEAR            2       /* clear this element */

@@ -371,10 +377,14 @@
         uint64_t dtada_normal;                  /* the normal -- 1 for denorm */
         size_t dtada_size;                      /* total size of the data */
         caddr_t dtada_delta;                    /* delta data, if available */
         caddr_t *dtada_percpu;                  /* per CPU data, if avail */
         caddr_t *dtada_percpu_delta;            /* per CPU delta, if avail */
+        int64_t dtada_total;                    /* per agg total, if avail */
+        uint16_t dtada_minbin;                  /* minimum bin, if avail */
+        uint16_t dtada_maxbin;                  /* maximum bin, if avail */
+        uint32_t dtada_flags;                   /* flags */
 };
 
 typedef int dtrace_aggregate_f(const dtrace_aggdata_t *, void *);
 typedef int dtrace_aggregate_walk_f(dtrace_hdl_t *,
     dtrace_aggregate_f *, void *);