diff --git a/include/ircd/allocator.h b/include/ircd/allocator.h
index 0d2041112..d06b50c22 100644
--- a/include/ircd/allocator.h
+++ b/include/ircd/allocator.h
@@ -37,6 +37,15 @@ namespace ircd::allocator
 	string_view info(const mutable_buffer &);
 };
 
+/// Valgrind memcheck hypercall suite
+namespace ircd::vg::mem
+{
+	bool defined(const const_buffer &);
+	void set_defined(const const_buffer &);
+	void set_undefined(const const_buffer &);
+	void set_noaccess(const const_buffer &);
+}
+
 /// Profiling counters. The purpose of this device is to gauge whether unwanted
 /// or non-obvious allocations are taking place for a specific section. This
 /// profiler has that very specific purpose and is not a replacement for
diff --git a/ircd/allocator.cc b/ircd/allocator.cc
index 2fde3cd80..51671e002 100644
--- a/ircd/allocator.cc
+++ b/ircd/allocator.cc
@@ -9,6 +9,7 @@
 // full license for this software is available in the LICENSE file.
 
 #include <RB_INC_MALLOC_H
+#include <RB_INC_VALGRIND_MEMCHECK_H
 
 // Uncomment or -D this #define to enable our own crude but simple ability to
 // profile dynamic memory usage. Global `new` and `delete` will be captured
@@ -66,6 +67,44 @@ ircd::allocator::trim(const size_t &pad)
 }
 #endif
 
+//
+// valgrind
+//
+
+void
+ircd::vg::mem::set_noaccess(const const_buffer &buf)
+{
+	#ifdef HAVE_VALGRIND_MEMCHECK_H
+	VALGRIND_MAKE_MEM_NOACCESS(data(buf), size(buf));
+	#endif
+}
+
+void
+ircd::vg::mem::set_undefined(const const_buffer &buf)
+{
+	#ifdef HAVE_VALGRIND_MEMCHECK_H
+	VALGRIND_MAKE_MEM_UNDEFINED(data(buf), size(buf));
+	#endif
+}
+
+void
+ircd::vg::mem::set_defined(const const_buffer &buf)
+{
+	#ifdef HAVE_VALGRIND_MEMCHECK_H
+	VALGRIND_MAKE_MEM_DEFINED(data(buf), size(buf));
+	#endif
+}
+
+bool
+ircd::vg::mem::defined(const const_buffer &buf)
+{
+	#ifdef HAVE_VALGRIND_MEMCHECK_H
+	return VALGRIND_CHECK_MEM_IS_DEFINED(data(buf), size(buf)) == 0;
+	#else
+	return true;
+	#endif
+}
+
 //
 // allocator::state
 //