diff --git a/hphp/runtime/base/profile_dump.h b/hphp/runtime/base/profile_dump.h
new file mode 100644
index 000000000..10763dd96
--- /dev/null
+++ b/hphp/runtime/base/profile_dump.h
@@ -0,0 +1,66 @@
+/*
+   +----------------------------------------------------------------------+
+   | HipHop for PHP                                                       |
+   +----------------------------------------------------------------------+
+   | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
+   +----------------------------------------------------------------------+
+   | This source file is subject to version 3.01 of the PHP license,      |
+   | that is bundled with this package in the file LICENSE, and is        |
+   | available through the world-wide-web at the following url:           |
+   | http://www.php.net/license/3_01.txt                                  |
+   | If you did not receive a copy of the PHP license and are unable to   |
+   | obtain it through the world-wide-web, please send a note to          |
+   | license@php.net so we can mail you a copy immediately.               |
+   +----------------------------------------------------------------------+
+*/
+
+#ifndef incl_HPHP_PROFILE_DUMP_H_
+#define incl_HPHP_PROFILE_DUMP_H_
+
+#include "hphp/runtime/vm/srckey.h"
+
+namespace HPHP {
+
+// A StackTrace is represented by SrcKeys, which uniquely identify logical
+// source locations. The lowermost stack frame recorded should go in the
+// lowest index of the vector.
+typedef std::vector<SrcKey> ProfileStackTrace;
+
+// pprof format requires us to keep track of the number of live objects
+// (or total in the accumulative case), and the number of bytes they occupy.
+struct SiteAllocations {
+  size_t m_count;
+  size_t m_bytes;
+};
+
+// Allocation data for each stack trace. pprof wants both what is currently
+// being used and what was allocated across the lifetime of the heap.
+struct ProfileDump {
+  void clear() {
+    m_currentlyAllocated.clear();
+    m_accumAllocated.clear();
+  }
+
+  void addAlloc(size_t size, const ProfileStackTrace &trace) {
+    auto &current = m_currentlyAllocated[trace];
+    current.m_count++;
+    current.m_bytes += size;
+    auto &accum = m_accumAllocated[trace];
+    accum.m_count++;
+    accum.m_bytes += size;
+  }
+  void removeAlloc(size_t size, const ProfileStackTrace &trace) {
+    auto &current = m_currentlyAllocated[trace];
+    current.m_count--;
+    current.m_bytes -= size;
+    assert(current.m_count >= 0 && current.m_bytes >= 0);
+  }
+
+private:
+  std::map<ProfileStackTrace, SiteAllocations> m_currentlyAllocated;
+  std::map<ProfileStackTrace, SiteAllocations> m_accumAllocated;
+};
+
+}
+
+#endif // incl_HPHP_PROFILE_DUMP_H_