Added histogram to track distribution of requested idle notifications.

src/counters.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 273 matching lines @@
 #endif
   }
 
  private:
   HistogramTimer* timer_;
 #ifdef DEBUG
   bool skipped_timer_start_;
 #endif
 };
 
+#define HISTOGRAM_RANGE_LIST(HR) \
+  /* Generic range histograms */ \
+  HR(gc_idle_time_allotted_in_ms, V8.GCIdleTimeAllottedInMS, 0, 1000, 1001)
 
 #define HISTOGRAM_TIMER_LIST(HT)                             \
   /* Garbage collection timers. */                           \
   HT(gc_compactor, V8.GCCompactor)                           \
   HT(gc_scavenger, V8.GCScavenger)                           \
   HT(gc_context, V8.GCContext) /* GC context cleanup time */ \
   HT(gc_idle_notification, V8.GCIdleNotification)            \
   HT(gc_incremental_marking, V8.GCIncrementalMarking)        \
   /* Parsing timers. */                                      \
   HT(parse, V8.Parse)                                        \
@@ skipping 240 matching lines @@
   SC(property_cell_space_bytes_used,                                  \
      V8.MemoryPropertyCellSpaceBytesUsed)                             \
   SC(lo_space_bytes_available, V8.MemoryLoSpaceBytesAvailable)        \
   SC(lo_space_bytes_committed, V8.MemoryLoSpaceBytesCommitted)        \
   SC(lo_space_bytes_used, V8.MemoryLoSpaceBytesUsed)
 
 
 // This file contains all the v8 counters that are in use.
 class Counters {
  public:
+#define HR(name, caption, min, max, num_buckets) \
+  Histogram* name() { return &name##_; }
+  HISTOGRAM_RANGE_LIST(HR)
+#undef HR
+
 #define HT(name, caption) \
   HistogramTimer* name() { return &name##_; }
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define HP(name, caption) \
   Histogram* name() { return &name##_; }
   HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
@@ skipping 67 matching lines @@
     kSizeOfCODE_AGE__##name,
     CODE_AGE_LIST_COMPLETE(COUNTER_ID)
 #undef COUNTER_ID
     stats_counter_count
   };
 
   void ResetCounters();
   void ResetHistograms();
 
  private:
+#define HR(name, caption, min, max, num_buckets) Histogram name##_;
+  HISTOGRAM_RANGE_LIST(HR)
+#undef HR
+
 #define HT(name, caption) \
   HistogramTimer name##_;
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define HP(name, caption) \
   Histogram name##_;
   HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
@@ skipping 35 matching lines @@
   friend class Isolate;
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COUNTERS_H_