Constrain the zone segment pool size

src/zone/accounting-allocator.h

Index: src/zone/accounting-allocator.h
diff --git a/src/zone/accounting-allocator.h b/src/zone/accounting-allocator.h
index f519c45db33637bbc78bbe3c0539269b17ab30db..0a47e5c0cc4f5d975e81e5eda6c558a569d1c9d2 100644
--- a/src/zone/accounting-allocator.h
+++ b/src/zone/accounting-allocator.h
@@ -19,6 +19,11 @@ namespace internal {
 
 class V8_EXPORT_PRIVATE AccountingAllocator {
  public:
+  static const size_t kMaxPoolSizeLowMemoryDevice = 8ul * KB;
+  static const size_t kMaxPoolSizeMediumMemoryDevice = 1ul * MB;
+  static const size_t kMaxPoolSizeHighMemoryDevice = 2ul * MB;
+  static const size_t kMaxPoolSizeHugeMemoryDevice = 3ul * MB;
+
   AccountingAllocator();
   virtual ~AccountingAllocator();
 
@@ -34,6 +39,7 @@ class V8_EXPORT_PRIVATE AccountingAllocator {
   size_t GetCurrentPoolSize() const;
 
   void MemoryPressureNotification(MemoryPressureLevel level);
+  void ConfigureSegmentPool(const size_t max_pool_size);
 
   virtual void ZoneCreation(const Zone* zone) {}
   virtual void ZoneDestruction(const Zone* zone) {}
@@ -41,10 +47,12 @@ class V8_EXPORT_PRIVATE AccountingAllocator {
  private:
   static const uint8_t kMinSegmentSizePower = 13;
   static const uint8_t kMaxSegmentSizePower = 18;
-  static const uint8_t kMaxSegmentsPerBucket = 5;
 
   STATIC_ASSERT(kMinSegmentSizePower <= kMaxSegmentSizePower);
 
+  static const uint8_t kNumberBuckets =

[jochen (gone - plz use gerrit), 2016/10/19 14:18:31]

size_t please

+      1 + kMaxSegmentSizePower - kMinSegmentSizePower;
+
   // Allocates a new segment. Returns nullptr on failed allocation.
   Segment* AllocateSegment(size_t bytes);
   void FreeSegment(Segment* memory);
@@ -57,10 +65,10 @@ class V8_EXPORT_PRIVATE AccountingAllocator {
   // Empties the pool and puts all its contents onto the garbage stack.
   void ClearPool();
 
-  Segment*
-      unused_segments_heads_[1 + kMaxSegmentSizePower - kMinSegmentSizePower];
+  Segment* unused_segments_heads_[kNumberBuckets];
 
-  size_t unused_segments_sizes[1 + kMaxSegmentSizePower - kMinSegmentSizePower];
+  uint8_t unused_segments_sizes[kNumberBuckets];

[jochen (gone - plz use gerrit), 2016/10/19 14:18:31]

same here

also, members should end in _

[jochen (gone - plz use gerrit), 2016/10/19 14:18:31]

same here

+  uint8_t unused_segments_max_sizes[kNumberBuckets];
 
   base::Mutex unused_segments_mutex_;