+/* Use tcmalloc's malloc_size() when available.
+ * When tcmalloc is used, native OSX malloc_size() may never be used because
+ * this expects a different allocation scheme. Therefore, *exclusively* use
+ * either tcmalloc or OSX's malloc_size()! */
+#if defined(USE_TCMALLOC)
+#include <google/tcmalloc.h>
+#if TC_VERSION_MAJOR >= 1 && TC_VERSION_MINOR >= 6
+#define HAVE_MALLOC_SIZE 1
+#define redis_malloc_size(p) tc_malloc_size(p)
+#endif
+#elif defined(__APPLE__)