Add option to compute average scavenge speed w.r.t survived objects.

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 4664 matching lines @@
     CollectAllGarbage(kMakeHeapIterableMask, "Heap::MakeHeapIterable");
   }
   if (mark_compact_collector()->sweeping_in_progress()) {
     mark_compact_collector()->EnsureSweepingCompleted();
   }
   DCHECK(IsHeapIterable());
 }
 
 
 bool Heap::HasLowYoungGenerationAllocationRate() {
-  const double high_mutator_utilization = 0.995;
+  const double high_mutator_utilization = 0.993;
   double mutator_speed = static_cast<double>(
       tracer()->NewSpaceAllocationThroughputInBytesPerMillisecond());
-  double gc_speed =
-      static_cast<double>(tracer()->ScavengeSpeedInBytesPerMillisecond());
+  double gc_speed = static_cast<double>(
+      tracer()->ScavengeSpeedInBytesPerMillisecond(kForSurvivedObjects));
   if (mutator_speed == 0 || gc_speed == 0) return false;
   double mutator_utilization = gc_speed / (mutator_speed + gc_speed);
   return mutator_utilization > high_mutator_utilization;
 }
 
 
 bool Heap::HasLowOldGenerationAllocationRate() {
-  const double high_mutator_utilization = 0.995;
+  const double high_mutator_utilization = 0.993;
   double mutator_speed = static_cast<double>(
       tracer()->OldGenerationAllocationThroughputInBytesPerMillisecond());
   double gc_speed = static_cast<double>(
       tracer()->CombinedMarkCompactSpeedInBytesPerMillisecond());
   if (mutator_speed == 0 || gc_speed == 0) return false;
   double mutator_utilization = gc_speed / (mutator_speed + gc_speed);
   return mutator_utilization > high_mutator_utilization;
 }
 
 
@@ skipping 2103 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8