[heap] Simplify and scale ResourceConstraints::ConfigureDefaults.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index a1cb4d22bef229aef7dffe7ce85807a1791c0733..24096e2cb118708fe4fc36d82a1c60cc65babc43 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -614,18 +614,13 @@ class Heap {
 #endif
 
   // 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;
+  static const int kMinSemiSpaceSize = 1 * kPointerMultiplier;
+  static const int kMaxSemiSpaceSize = 8 * kPointerMultiplier;
 
   // The old space size has to be a multiple of Page::kPageSize.
   // Sizes are in MB.
-  static const int kMaxOldSpaceSizeLowMemoryDevice = 128 * kPointerMultiplier;
-  static const int kMaxOldSpaceSizeMediumMemoryDevice =
-      256 * kPointerMultiplier;
-  static const int kMaxOldSpaceSizeHighMemoryDevice = 512 * kPointerMultiplier;
-  static const int kMaxOldSpaceSizeHugeMemoryDevice = 1024 * kPointerMultiplier;
+  static const int kMinOldSpaceSize = 128 * kPointerMultiplier;
+  static const int kMaxOldSpaceSize = 1024 * kPointerMultiplier;
 
   static const int kTraceRingBufferSize = 512;
   static const int kStacktraceBufferSize = 512;
@@ -951,10 +946,12 @@ class Heap {
   bool ShouldOptimizeForMemoryUsage();
 
   bool IsLowMemoryDevice() {
+    const int kMaxOldSpaceSizeLowMemoryDevice = 128 * kPointerMultiplier;

[Hannes Payer (out of office), 2017/05/19 11:39:57]

I will remove these two methods in a follow-up CL. I am keeping the constants
until then local in these methods.

     return max_old_generation_size_ <= kMaxOldSpaceSizeLowMemoryDevice;
   }
 
   bool IsMemoryConstrainedDevice() {
+    const int kMaxOldSpaceSizeMediumMemoryDevice = 256 * kPointerMultiplier;
     return max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice;
   }