Reduce zone segment pool size on all devices to 8kb

src/zone/accounting-allocator.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ZONE_ACCOUNTING_ALLOCATOR_H_
 #define V8_ZONE_ACCOUNTING_ALLOCATOR_H_
 
 #include "include/v8-platform.h"
 #include "src/base/atomic-utils.h"
 #include "src/base/atomicops.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/semaphore.h"
 #include "src/base/platform/time.h"
 #include "src/zone/zone-segment.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace v8 {
 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;
+  static const size_t kMaxPoolSizeMediumMemoryDevice = 8ul * KB;
+  static const size_t kMaxPoolSizeHighMemoryDevice = 8ul * KB;
+  static const size_t kMaxPoolSizeHugeMemoryDevice = 8ul * KB;
 
   AccountingAllocator();
   virtual ~AccountingAllocator();
 
   // Gets an empty segment from the pool or creates a new one.
   virtual Segment* GetSegment(size_t bytes);
   // Return unneeded segments to either insert them into the pool or release
   // them if the pool is already full or memory pressure is high.
   virtual void ReturnSegment(Segment* memory);
 
@@ skipping 48 matching lines @@
 
   base::AtomicValue<MemoryPressureLevel> memory_pressure_level_;
 
   DISALLOW_COPY_AND_ASSIGN(AccountingAllocator);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ZONE_ACCOUNTING_ALLOCATOR_H_