Start with a more conservative initial old generation size.

BUG=

Review URL: https://codereview.chromium.org/934803002

Cr-Commit-Position: refs/heads/master@{#26692}

src/heap/heap.cc

@@ -67,7 +67,8 @@ Heap::Heap()
       initial_semispace_size_(Page::kPageSize),
       target_semispace_size_(Page::kPageSize),
       max_old_generation_size_(700ul * (kPointerSize / 4) * MB),
-      initial_old_generation_size_(max_old_generation_size_),
+      initial_old_generation_size_(max_old_generation_size_ /
+                                   kInitalOldGenerationLimitFactor),
       old_generation_size_configured_(false),
       max_executable_size_(256ul * (kPointerSize / 4) * MB),
       // Variables set based on semispace_size_ and old_generation_size_ in
@@ -5281,7 +5282,8 @@ bool Heap::ConfigureHeap(int max_semi_space_size, int max_old_space_size,
   if (FLAG_initial_old_space_size > 0) {
     initial_old_generation_size_ = FLAG_initial_old_space_size * MB;
   } else {
-    initial_old_generation_size_ = max_old_generation_size_ / 2;
+    initial_old_generation_size_ =
+        max_old_generation_size_ / kInitalOldGenerationLimitFactor;
   }
   old_generation_allocation_limit_ = initial_old_generation_size_;
 

src/heap/heap.h

@@ -1084,6 +1084,8 @@ class Heap {
   static const intptr_t kMinimumOldGenerationAllocationLimit =
       8 * (Page::kPageSize > MB ? Page::kPageSize : MB);
 
+  static const int kInitalOldGenerationLimitFactor = 7;
+
   static const int kPointerMultiplier = i::kPointerSize / 4;
 
   // The new space size has to be a power of 2. Sizes are in MB.