Do not sample memory histograms in short idle notifications.

src/heap/heap.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4626 matching lines @@
   heap_state.scavenge_speed_in_bytes_per_ms =
       static_cast<size_t>(tracer()->ScavengeSpeedInBytesPerMillisecond());
   heap_state.used_new_space_size = new_space_.Size();
   heap_state.new_space_capacity = new_space_.Capacity();
   heap_state.new_space_allocation_throughput_in_bytes_per_ms =
       static_cast<size_t>(
           tracer()->NewSpaceAllocationThroughputInBytesPerMillisecond());
 
   GCIdleTimeAction action =
       gc_idle_time_handler_.Compute(idle_time_in_ms, heap_state);
+
   isolate()->counters()->gc_idle_time_allotted_in_ms()->AddSample(
       static_cast<int>(idle_time_in_ms));
-  int committed_memory = static_cast<int>(CommittedMemory() / KB);
-  int used_memory = static_cast<int>(heap_state.size_of_objects / KB);
-  isolate()->counters()->aggregated_memory_heap_committed()->AddSample(
-      start_ms, committed_memory);
-  isolate()->counters()->aggregated_memory_heap_used()->AddSample(start_ms,
-                                                                  used_memory);
+  if (is_long_idle_notification) {
+    int committed_memory = static_cast<int>(CommittedMemory() / KB);
+    int used_memory = static_cast<int>(heap_state.size_of_objects / KB);
+    isolate()->counters()->aggregated_memory_heap_committed()->AddSample(
+        start_ms, committed_memory);
+    isolate()->counters()->aggregated_memory_heap_used()->AddSample(
+        start_ms, used_memory);
+  }
 
   bool result = false;
   switch (action.type) {
     case DONE:
       result = true;
       break;
     case DO_INCREMENTAL_MARKING: {
       if (incremental_marking()->IsStopped()) {
         incremental_marking()->Start();
       }
@@ skipping 1821 matching lines @@
       }
       delete list;
     } else {
       prev = list;
     }
     list = next;
   }
 }
 }
 }  // namespace v8::internal