Constrain the zone segment pool size

test/unittests/zone/segmentpool-unittest.cc

Index: test/unittests/zone/segmentpool-unittest.cc
diff --git a/test/unittests/zone/segmentpool-unittest.cc b/test/unittests/zone/segmentpool-unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dd2c94f729a375965cb2821369a2c52235a45c39
--- /dev/null
+++ b/test/unittests/zone/segmentpool-unittest.cc
@@ -0,0 +1,35 @@
+// 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.
+
+#include "src/zone/accounting-allocator.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace internal {
+
+TEST(Zone, SegmentPoolConstraints) {
+  size_t sizes[]{
+      0,  // Corner case
+      AccountingAllocator::kMaxPoolSizeLowMemoryDevice,
+      AccountingAllocator::kMaxPoolSizeMediumMemoryDevice,
+      AccountingAllocator::kMaxPoolSizeHighMemoryDevice,
+      AccountingAllocator::kMaxPoolSizeHugeMemoryDevice,
+      GB  // Something really large
+  };
+
+  AccountingAllocator allocator;
+  for (size_t size : sizes) {
+    allocator.ConfigureSegmentPool(size);
+    size_t total_size = 0;
+    for (size_t power = 0; power < AccountingAllocator::kNumberBuckets;
+         ++power) {
+      total_size +=
+          allocator.unused_segments_max_sizes_[power] * (size_t(1) << power);
+    }
+    EXPECT_LE(total_size, size);
+  }
+}
+
+}  // namespace internal
+}  // namespace v8