Grow big old generation slower.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/324403008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21808 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -60,7 +60,6 @@ Heap::Heap()
 // Will be 4 * reserved_semispace_size_ to ensure that young
 // generation can be aligned to its size.
       maximum_committed_(0),
-      old_space_growing_factor_(4),
       survived_since_last_expansion_(0),
       sweep_generation_(0),
       always_allocate_scope_depth_(0),
@@ -5026,12 +5025,6 @@ bool Heap::ConfigureHeap(int max_semi_space_size,
 
   code_range_size_ = code_range_size * MB;
 
-  // We set the old generation growing factor to 2 to grow the heap slower on
-  // memory-constrained devices.
-  if (max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice) {
-    old_space_growing_factor_ = 2;
-  }
-
   configured_ = true;
   return true;
 }

src/heap.h

@@ -1085,9 +1085,23 @@ class Heap {
       700 * kPointerMultiplier;
 
   intptr_t OldGenerationAllocationLimit(intptr_t old_gen_size) {
-    intptr_t limit = FLAG_stress_compaction
-        ? old_gen_size + old_gen_size / 10
-        : old_gen_size * old_space_growing_factor_;
+    intptr_t limit;
+    if (FLAG_stress_compaction) {
+      limit = old_gen_size + old_gen_size / 10;
+    } else if (old_gen_size < max_old_generation_size_ / 8) {
+      if (max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice) {
+        limit = old_gen_size * 2;
+      } else {
+        limit = old_gen_size * 4;
+      }
+    } else if (old_gen_size < max_old_generation_size_ / 4) {
+      limit = static_cast<intptr_t>(old_gen_size * 1.5);
+    } else if (old_gen_size < max_old_generation_size_ / 2) {
+      limit = static_cast<intptr_t>(old_gen_size * 1.2);
+    } else {
+      limit = static_cast<intptr_t>(old_gen_size * 1.1);
+    }
+
     limit = Max(limit, kMinimumOldGenerationAllocationLimit);
     limit += new_space_.Capacity();
     intptr_t halfway_to_the_max = (old_gen_size + max_old_generation_size_) / 2;
@@ -1512,11 +1526,6 @@ class Heap {
   intptr_t max_executable_size_;
   intptr_t maximum_committed_;
 
-  // The old space growing factor is used in the old space heap growing
-  // strategy. The new old space size is the current old space size times
-  // old_space_growing_factor_.
-  int old_space_growing_factor_;
-
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
   int survived_since_last_expansion_;