Take into account freed global handles for heap growing.

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 1307 matching lines @@
 
   double gc_speed = tracer()->CombinedMarkCompactSpeedInBytesPerMillisecond();
   double mutator_speed = static_cast<double>(
       tracer()
           ->CurrentOldGenerationAllocationThroughputInBytesPerMillisecond());
   intptr_t old_gen_size = PromotedSpaceSizeOfObjects();
   if (collector == MARK_COMPACTOR) {
     // Register the amount of external allocated memory.
     amount_of_external_allocated_memory_at_last_global_gc_ =
         amount_of_external_allocated_memory_;
-    SetOldGenerationAllocationLimit(old_gen_size, gc_speed, mutator_speed);
+    SetOldGenerationAllocationLimit(old_gen_size, gc_speed, mutator_speed,
+                                    freed_global_handles);
   } else if (HasLowYoungGenerationAllocationRate() &&
              old_generation_size_configured_) {
     DampenOldGenerationAllocationLimit(old_gen_size, gc_speed, mutator_speed);
   }
 
   {
     GCCallbacksScope scope(this);
     if (scope.CheckReenter()) {
       AllowHeapAllocation allow_allocation;
       GCTracer::Scope scope(tracer(), GCTracer::Scope::EXTERNAL);
@@ skipping 4307 matching lines @@
   intptr_t limit = static_cast<intptr_t>(old_gen_size * factor);
   limit = Max(limit, old_gen_size + kMinimumOldGenerationAllocationLimit);
   limit += new_space_.Capacity();
   intptr_t halfway_to_the_max = (old_gen_size + max_old_generation_size_) / 2;
   return Min(limit, halfway_to_the_max);
 }
 
 
 void Heap::SetOldGenerationAllocationLimit(intptr_t old_gen_size,
                                            double gc_speed,
-                                           double mutator_speed) {
+                                           double mutator_speed,
+                                           int freed_global_handles) {
+  const int kFreedGlobalHandlesThreshold = 700;

[ulan, 2015/07/30 13:58:32]

These numbers are from the old heap growing strategy. 

+  const double kMaxHeapGrowingFactorForManyFreedGlobalHandles = 1.3;
+
   double factor = HeapGrowingFactor(gc_speed, mutator_speed);
 
   if (FLAG_trace_gc_verbose) {
     PrintIsolate(isolate_,
                  "Heap growing factor %.1f based on mu=%.3f, speed_ratio=%.f "
                  "(gc=%.f, mutator=%.f)\n",
                  factor, kTargetMutatorUtilization, gc_speed / mutator_speed,
                  gc_speed, mutator_speed);
   }
 
   // We set the old generation growing factor to 2 to grow the heap slower on
   // memory-constrained devices.
   if (max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice ||
       FLAG_optimize_for_size) {
     factor = Min(factor, kMaxHeapGrowingFactorMemoryConstrained);
   }
 
+  if (freed_global_handles >= kFreedGlobalHandlesThreshold) {
+    factor = Min(factor, kMaxHeapGrowingFactorForManyFreedGlobalHandles);
+  }
+
   if (FLAG_stress_compaction ||
       mark_compact_collector()->reduce_memory_footprint_) {
     factor = kMinHeapGrowingFactor;
   }
 
   old_generation_allocation_limit_ =
       CalculateOldGenerationAllocationLimit(factor, old_gen_size);
 
   if (FLAG_trace_gc_verbose) {
     PrintIsolate(isolate_, "Grow: old size: %" V8_PTR_PREFIX
@@ skipping 1240 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