diff --git a/tests/extension.prof b/tests/extension.prof
new file mode 100644
index 00000000..4398cb13
Binary files /dev/null and b/tests/extension.prof differ
diff --git a/tests/run_slow.py b/tests/run_slow.py
new file mode 100644
index 00000000..0c5602d9
--- /dev/null
+++ b/tests/run_slow.py
@@ -0,0 +1,17 @@
+
+# Test profiling of mixed Python / native code stacks
+
+from ctypes import *
+
+h = cdll.LoadLibrary("./slow_ext.so")
+
+def more_slow():
+    h.slow2(10000)
+
+def slow_wrap():
+    h.slow2(20000)
+    more_slow()
+
+if __name__ == '__main__':
+    slow_wrap()
+
diff --git a/tests/slow_ext.cpp b/tests/slow_ext.cpp
new file mode 100644
index 00000000..809862c1
--- /dev/null
+++ b/tests/slow_ext.cpp
@@ -0,0 +1,33 @@
+
+// Extension module with slow code
+// Test profiling of native code
+//
+// Compile with:
+// g++ -fPIC -g -O0 --shared -o slow_ext.so slow_ext.cpp
+
+#include <stdio.h>
+
+extern "C" {
+int slow1(int n);
+int slow2(int n);
+}
+
+int slow1(int n)
+{
+    int sum = 0;
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j < 100000; j++) {
+            sum += i*j;
+        }
+    }
+
+    return sum;
+}
+
+int slow2(int n)
+{
+    return slow1(n);
+}
+
+
+
diff --git a/vmprof/addrspace.py b/vmprof/addrspace.py
index 9a315657..612cb884 100644
--- a/vmprof/addrspace.py
+++ b/vmprof/addrspace.py
@@ -38,6 +38,9 @@ class JittedVirtual(Hashable):
 class VirtualFrame(Hashable):
     pass
 
+class NativeFrame(Hashable):
+    pass
+
 class BaseMetaFrame(Hashable):
     def add_to_meta(self, meta):
         meta[self.name] = meta.get(self.name, 0) + 1
@@ -57,6 +60,16 @@ class WarmupFrame(BaseMetaFrame):
 class BlackholeWarmupFrame(WarmupFrame):
     name = 'blackhole'
 
+def is_python_runtime(lib):
+    lib_path = []
+    if lib and lib.name:
+        lib_path = lib.name.split('/')
+
+    if lib_path and 'libpython' in lib_path[-1]:
+        return True
+
+    return False
+
 class AddressSpace(object):
     def __init__(self, libs):
         all = [(lib.start, lib) for lib in libs]
@@ -114,7 +127,7 @@ def filter(self, profiles):
                 filtered_profiles.append((current, prof[1]))
         return filtered_profiles
 
-    def _next_profile(self, lst, jit_frames, addr_set, interp_name,
+    def _filter_stack(self, lst, jit_frames, addr_set, interp_name,
                       only_virtual):
         current = []
         jitting = False
@@ -136,17 +149,28 @@ def _next_profile(self, lst, jit_frames, addr_set, interp_name,
                     current.append(JitAddr(jit_addr))
                     jitting = False
                     continue
+
             if addr in self.meta_data:
                 current.append(self.meta_data[addr](addr))
-            elif is_virtual or not only_virtual:
+                continue
+
+            cls = None
+            if not only_virtual:
+                if not is_python_runtime(lib):
+                    cls = NativeFrame
+
+            if is_virtual:
                 if jitting:
                     cls = JittedVirtual
                 else:
                     cls = VirtualFrame
+
+            if cls:
                 if previous_virtual != addr:
                     current.append(cls(addr))
                     previous_virtual = current[-1]
                 addr_set.add(addr)
+
         return current
 
     def filter_addr(self, profiles, only_virtual=True,
@@ -159,7 +183,7 @@ def filter_addr(self, profiles, only_virtual=True,
             if len(prof[0]) < 5:
                 skipped += 1
                 continue # broken profile
-            current = self._next_profile(prof[0], jit_frames, addr_set,
+            current = self._filter_stack(prof[0], jit_frames, addr_set,
                                          interp_name, only_virtual)
             if current:
                 current.reverse()
diff --git a/vmprof/profiler.py b/vmprof/profiler.py
index b66d1688..c9f4cfcf 100644
--- a/vmprof/profiler.py
+++ b/vmprof/profiler.py
@@ -30,6 +30,9 @@ def read_profile(prof_filename, lib_cache={}, extra_libs=None,
 
     period, profiles, virtual_symbols, libs, interp_name = read_prof(prof)
 
+    if interp_name == 'pypy':
+        virtual_only = True
+
     if not virtual_only or include_extra_info:
         exe_name = libs[0].name
         for lib in libs:
diff --git a/vmprof/show.py b/vmprof/show.py
index 5482d2a6..18fc5402 100644
--- a/vmprof/show.py
+++ b/vmprof/show.py
@@ -31,15 +31,17 @@ def __init__(self, prune_percent=None, prune_level=None, indent=None):
         self._prune_level = prune_level or 1000
         self._indent = indent or 2
 
-    def show(self, profile):
+    def show(self, profile, virtual_only):
         """
         Read and display a vmprof profile file.
 
         :param profile: The filename of the vmprof profile file to display.
         :type profile: str
+        :param virtual_only: Display only Python frames
+        :type profile: bool
         """
         try:
-            stats = vmprof.read_profile(profile, virtual_only=True, include_extra_info=True)
+            stats = vmprof.read_profile(profile, virtual_only=virtual_only, include_extra_info=True)
         except Exception as e:
             print("Fatal: could not read vmprof profile file '{}': {}".format(profile, e))
             return
@@ -91,6 +93,13 @@ def print_node(parent, node, level):
                     p3 = click.style(funname, fg='white', bold=False)
                     p5 = click.style("{:>2}".format(level), fg='red', bold=False)
 
+                elif parts == 0:   
+                    # Native code frame
+                    funname = node.name
+                    p2 = click.style(funname, fg='green', bold=True)
+                    p2b = click.style(('.' * level * self._indent), fg='green', bold=False)
+                    p3 = ""
+
                 else:
                     raise Exception("fail!")
 
@@ -108,9 +117,10 @@ def print_node(parent, node, level):
 @click.option('--prune_percent', type=float, default=0, help='The indention per level within the call graph.')
 @click.option('--prune_level', type=int, default=None, help='Prune output of a profile stats node when CPU.')
 @click.option('--indent', type=int, default=2, help='The indention per level within the call graph.')
-def main(profile, prune_percent, prune_level, indent):
+@click.option('--python_only', is_flag=True, help='Show only Python frames.')
+def main(profile, prune_percent, prune_level, indent, python_only):
     pp = PrettyPrinter(prune_percent=prune_percent, prune_level=prune_level, indent=indent)
-    pp.show(profile)
+    pp.show(profile, virtual_only=python_only)
 
 
 if __name__ == '__main__':
diff --git a/vmprof/stats.py b/vmprof/stats.py
index 7d57c11d..69cae3fe 100644
--- a/vmprof/stats.py
+++ b/vmprof/stats.py
@@ -1,6 +1,6 @@
 import six
 from vmprof.addrspace import JittedVirtual, JitAddr, VirtualFrame,\
-     BaseMetaFrame
+     BaseMetaFrame, NativeFrame
 
 class EmptyProfileFile(Exception):
     pass
@@ -106,7 +106,7 @@ def get_tree(self):
             for i in range(1, len(profile[0])):
                 addr = profile[0][i]
                 name = self._get_name(addr)
-                if not isinstance(addr, (VirtualFrame, JittedVirtual)):
+                if not isinstance(addr, (VirtualFrame, JittedVirtual, NativeFrame)):
                     continue
                 last_virtual = addr
                 last_virtual_pos = i