Grow old generation slower on low-memory devices.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index bdc0c4f45e388bef4d820ab52b63b231d505e2ca..3ec77ebbc1fe186ee4e9005fdaa89bd391f6192a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -460,7 +460,7 @@ Extension::Extension(const char* name,
 
 
 ResourceConstraints::ResourceConstraints()
-    : max_young_space_size_(0),
+    : max_new_space_size_(0),
       max_old_space_size_(0),
       max_executable_size_(0),
       stack_limit_(NULL),
@@ -470,7 +470,6 @@ ResourceConstraints::ResourceConstraints()
 void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
                                             uint64_t virtual_memory_limit,
                                             uint32_t number_of_processors) {
-  const int lump_of_memory = (i::kPointerSize / 4) * i::MB;
 #if V8_OS_ANDROID
   // Android has higher physical memory requirements before raising the maximum
   // heap size limits since it has no swap space.
@@ -483,24 +482,22 @@ void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
   const uint64_t high_limit = 1ul  * i::GB;
 #endif
 
-  // The young_space_size should be a power of 2 and old_generation_size should
-  // be a multiple of Page::kPageSize.
   if (physical_memory <= low_limit) {
-    set_max_young_space_size(2 * lump_of_memory);
-    set_max_old_space_size(128 * lump_of_memory);
-    set_max_executable_size(96 * lump_of_memory);
+    set_max_new_space_size(i::Heap::kMaxNewSpaceSizeLowMemoryDevice);
+    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeLowMemoryDevice);
+    set_max_executable_size(i::Heap::kMaxExecutableSizeLowMemoryDevice);
   } else if (physical_memory <= medium_limit) {
-    set_max_young_space_size(8 * lump_of_memory);
-    set_max_old_space_size(256 * lump_of_memory);
-    set_max_executable_size(192 * lump_of_memory);
+    set_max_new_space_size(i::Heap::kMaxNewSpaceSizeMediumMemoryDevice);
+    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeMediumMemoryDevice);
+    set_max_executable_size(i::Heap::kMaxExecutableSizeMediumMemoryDevice);
   } else if (physical_memory <= high_limit) {
-    set_max_young_space_size(16 * lump_of_memory);
-    set_max_old_space_size(512 * lump_of_memory);
-    set_max_executable_size(256 * lump_of_memory);
+    set_max_new_space_size(i::Heap::kMaxNewSpaceSizeHighMemoryDevice);
+    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeHighMemoryDevice);
+    set_max_executable_size(i::Heap::kMaxExecutableSizeHighMemoryDevice);
   } else {
-    set_max_young_space_size(16 * lump_of_memory);
-    set_max_old_space_size(700 * lump_of_memory);
-    set_max_executable_size(256 * lump_of_memory);
+    set_max_new_space_size(i::Heap::kMaxNewSpaceSizeHugeMemoryDevice);
+    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeHugeMemoryDevice);
+    set_max_executable_size(i::Heap::kMaxExecutableSizeHugeMemoryDevice);
   }
 
   set_max_available_threads(i::Max(i::Min(number_of_processors, 4u), 1u));
@@ -517,15 +514,15 @@ void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
 bool SetResourceConstraints(Isolate* v8_isolate,
                             ResourceConstraints* constraints) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
-  int young_space_size = constraints->max_young_space_size();
+  int new_space_size = constraints->max_new_space_size();
   int old_gen_size = constraints->max_old_space_size();
   int max_executable_size = constraints->max_executable_size();
   int code_range_size = constraints->code_range_size();
-  if (young_space_size != 0 || old_gen_size != 0 || max_executable_size != 0 ||
+  if (new_space_size != 0 || old_gen_size != 0 || max_executable_size != 0 ||
       code_range_size != 0) {
     // After initialization it's too late to change Heap constraints.
     ASSERT(!isolate->IsInitialized());
-    bool result = isolate->heap()->ConfigureHeap(young_space_size / 2,
+    bool result = isolate->heap()->ConfigureHeap(new_space_size / 2,
                                                  old_gen_size,
                                                  max_executable_size,
                                                  code_range_size);