Always shrink initial old generation size based on survival rate.

src/heap/heap.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_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 1066 matching lines @@
     return old_generation_allocation_limit_ - PromotedTotalSize();
   }
 
   inline intptr_t OldGenerationCapacityAvailable() {
     return max_old_generation_size_ - PromotedTotalSize();
   }
 
   static const intptr_t kMinimumOldGenerationAllocationLimit =
       8 * (Page::kPageSize > MB ? Page::kPageSize : MB);
 
-  static const int kInitalOldGenerationLimitFactor = 7;
+  static const int kInitalOldGenerationLimitFactor = 2;
 
   static const int kPointerMultiplier = i::kPointerSize / 4;
 
   // The new space size has to be a power of 2. Sizes are in MB.
   static const int kMaxSemiSpaceSizeLowMemoryDevice = 1 * kPointerMultiplier;
   static const int kMaxSemiSpaceSizeMediumMemoryDevice = 4 * kPointerMultiplier;
   static const int kMaxSemiSpaceSizeHighMemoryDevice = 8 * kPointerMultiplier;
   static const int kMaxSemiSpaceSizeHugeMemoryDevice = 8 * kPointerMultiplier;
 
   // The old space size has to be a multiple of Page::kPageSize.
@@ skipping 1473 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_