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diff --git a/runtime/linear_alloc.h b/runtime/linear_alloc.h
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+++ b/runtime/linear_alloc.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_LINEAR_ALLOC_H_
+#define ART_RUNTIME_LINEAR_ALLOC_H_
+
+#include "base/arena_allocator.h"
+
+namespace art {
+
+class ArenaPool;
+
+// TODO: Support freeing if we add poor man's class unloading.
+class LinearAlloc {
+ public:
+  explicit LinearAlloc(ArenaPool* pool);
+
+  void* Alloc(Thread* self, size_t size);
+
+  // Allocate and construct an array of structs of type T.
+  template<class T>
+  T* AllocArray(Thread* self, size_t elements) {
+    return reinterpret_cast<T*>(Alloc(self, elements * sizeof(T)));
+  }
+
+  // Return the number of bytes used in the allocator.
+  size_t GetUsedMemory() const;
+
+ private:
+  mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
+  ArenaAllocator allocator_ GUARDED_BY(lock_);
+};
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_LINEAR_ALLOC_H_