Track how much we miss the idle notification limit

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, 10000, 101)
+#define HISTOGRAM_RANGE_LIST(HR)                                              \
+  /* Generic range histograms */                                              \
+  HR(gc_idle_time_allotted_in_ms, V8.GCIdleTimeAllottedInMS, 0, 10000, 101)   \
+  HR(gc_idle_time_limit_overshot, V8.GCIdleTimeLimit.Overshot, 0, 10000, 101) \
+  HR(gc_idle_time_limit_undershot, V8.GCIdleTimeLimi.Undershot, 0, 10000, 101)
 
 #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)        \
   HT(gc_low_memory_notification, V8.GCLowMemoryNotification) \
   /* Parsing timers. */                                      \
@@ skipping 389 matching lines @@
   friend class Isolate;
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COUNTERS_H_