--- /dev/null
+++ libmalloc/libmalloc-317.140.5/tests/MallocBenchTest/MALLOC_BENCH/MallocBench/balloon.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "CPUCount.h"
+#include "Memory.h"
+#include "balloon.h"
+#include <array>
+#include <chrono>
+#include <memory>
+#include <stddef.h>
+#include <strings.h>
+
+#include "mbmalloc.h"
+
+void benchmark_balloon(CommandLine&)
+{
+    const size_t chunkSize = 1 * 1024;
+    const size_t balloonSize = 100 * 1024 * 1024;
+    const size_t steadySize = 10 * 1024 * 1024;
+    
+    std::array<void*, balloonSize / chunkSize> balloon;
+    std::array<void*, balloonSize / chunkSize> steady;
+
+    auto start = std::chrono::steady_clock::now();
+
+    for (size_t i = 0; i < balloon.size(); ++i) {
+        balloon[i] = mbmalloc(chunkSize);
+        bzero(balloon[i], chunkSize);
+    }
+
+    for (size_t i = 0; i < balloon.size(); ++i)
+        mbfree(balloon[i], chunkSize);
+
+    auto stop = std::chrono::steady_clock::now();
+    
+    auto benchmarkTime = stop - start;
+
+    start = std::chrono::steady_clock::now();
+
+    // Converts bytes to time -- for reporting's sake -- by waiting a while until
+    // the heap shrinks back down. This isn't great for pooling with other
+    // benchmarks in a geometric mean of throughput, but it's OK for basic testing.
+    while (currentMemoryBytes().resident > 2 * steadySize
+        && std::chrono::steady_clock::now() - start < 8 * benchmarkTime) {
+        for (size_t i = 0; i < steady.size(); ++i) {
+            steady[i] = mbmalloc(chunkSize);
+            bzero(steady[i], chunkSize);
+        }
+
+        for (size_t i = 0; i < steady.size(); ++i)
+            mbfree(steady[i], chunkSize);
+    }
+}