Grow old generation slower on low-memory devices.

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1500 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);
 
+  // The new space size has to be a power of 2.
+  static const int kMaxNewSpaceSizeLowMemoryDevice = 2;
+  static const int kMaxNewSpaceSizeMediumMemoryDevice = 8;
+  static const int kMaxNewSpaceSizeHighMemoryDevice = 16;
+  static const int kMaxNewSpaceSizeHugeMemoryDevice = 16;
+
+  // The old space size has to be a multiple of Page::kPageSize.
+  static const int kMaxOldSpaceSizeLowMemoryDevice = 128;
+  static const int kMaxOldSpaceSizeMediumMemoryDevice = 256;
+  static const int kMaxOldSpaceSizeHighMemoryDevice = 512;
+  static const int kMaxOldSpaceSizeHugeMemoryDevice = 700;
+
+  // The executable size has to be a multiple of Page::kPageSize.
+  static const int kMaxExecutableSizeLowMemoryDevice = 128;
+  static const int kMaxExecutableSizeMediumMemoryDevice = 256;
+  static const int kMaxExecutableSizeHighMemoryDevice = 512;
+  static const int kMaxExecutableSizeHugeMemoryDevice = 700;
+
   intptr_t OldGenerationAllocationLimit(intptr_t old_gen_size) {
-    intptr_t limit = FLAG_stress_compaction ?
-        old_gen_size + old_gen_size / 10 : old_gen_size * 4;
+    intptr_t limit = FLAG_stress_compaction
+        ? old_gen_size + old_gen_size / 10
+        : old_gen_size * old_space_growing_factor_;
     limit = Max(limit, 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);
   }
 
   // Indicates whether inline bump-pointer allocation has been disabled.
   bool inline_allocation_disabled() { return inline_allocation_disabled_; }
 
   // Switch whether inline bump-pointer allocation should be used.
@@ skipping 345 matching lines @@
   Object* roots_[kRootListLength];
 
   intptr_t code_range_size_;
   int reserved_semispace_size_;
   int max_semispace_size_;
   int initial_semispace_size_;
   intptr_t max_old_generation_size_;
   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_;
 
   // For keeping track on when to flush RegExp code.
   int sweep_generation_;
 
   int always_allocate_scope_depth_;
   int linear_allocation_scope_depth_;
 
@@ skipping 1159 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_