Fix python2/3 incompatible percpu helpers

The python3 version of the percpu helpers (average, sum, etc.) were
using a python2 function that has since moved to functools (reduce).

Worse, the test case for percpu functionality was not enabled in the
cmake file. Better turn that on and make it work.
Signed-off-by: Brenden Blanco <bblanco@gmail.com>

src/python/bcc/table.py

@@ -14,6 +14,7 @@
 
 from collections import MutableMapping
 import ctypes as ct
+from functools import reduce
 import multiprocessing
 import os
 
@@ -596,7 +597,7 @@ class PerCpuHash(HashTable):
     def sum(self, key):
         if isinstance(self.Leaf(), ct.Structure):
             raise IndexError("Leaf must be an integer type for default sum functions")
-        return self.sLeaf(reduce(lambda x,y: x+y, self.getvalue(key)))
+        return self.sLeaf(sum(self.getvalue(key)))
 
     def max(self, key):
         if isinstance(self.Leaf(), ct.Structure):
@@ -605,8 +606,7 @@ class PerCpuHash(HashTable):
 
     def average(self, key):
         result = self.sum(key)
-        result.value/=self.total_cpu
-        return result
+        return result.value / self.total_cpu
 
 class LruPerCpuHash(PerCpuHash):
     def __init__(self, *args, **kwargs):
@@ -653,7 +653,7 @@ class PerCpuArray(ArrayBase):
     def sum(self, key):
         if isinstance(self.Leaf(), ct.Structure):
             raise IndexError("Leaf must be an integer type for default sum functions")
-        return self.sLeaf(reduce(lambda x,y: x+y, self.getvalue(key)))
+        return self.sLeaf(sum(self.getvalue(key)))
 
     def max(self, key):
         if isinstance(self.Leaf(), ct.Structure):
@@ -662,8 +662,7 @@ class PerCpuArray(ArrayBase):
 
     def average(self, key):
         result = self.sum(key)
-        result.value/=self.total_cpu
-        return result
+        return result.value / self.total_cpu
 
 class StackTrace(TableBase):
     MAX_DEPTH = 127

tests/python/CMakeLists.txt

@@ -58,6 +58,8 @@ add_test(NAME py_test_perf_event WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   COMMAND ${TEST_WRAPPER} py_test_perf_event sudo ${CMAKE_CURRENT_SOURCE_DIR}/test_perf_event.py)
 add_test(NAME py_test_utils WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   COMMAND ${TEST_WRAPPER} py_test_utils sudo ${CMAKE_CURRENT_SOURCE_DIR}/test_utils.py)
+add_test(NAME py_test_percpu WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMAND ${TEST_WRAPPER} py_test_percpu sudo ${CMAKE_CURRENT_SOURCE_DIR}/test_percpu.py)
 
 add_test(NAME py_test_dump_func WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   COMMAND ${TEST_WRAPPER} py_dump_func simple ${CMAKE_CURRENT_SOURCE_DIR}/test_dump_func.py)

tests/python/test_percpu.py

@@ -34,8 +34,8 @@ class TestPercpu(unittest.TestCase):
         sum = stats_map.sum(stats_map.Key(0))
         avg = stats_map.average(stats_map.Key(0))
         max = stats_map.max(stats_map.Key(0))
-        self.assertGreater(sum.value, 0L)
-        self.assertGreater(max.value, 0L)
+        self.assertGreater(sum.value, int(0))
+        self.assertGreater(max.value, int(0))
         bpf_code.detach_kprobe("sys_clone")
 
     def test_u32(self):
@@ -63,8 +63,8 @@ class TestPercpu(unittest.TestCase):
         sum = stats_map.sum(stats_map.Key(0))
         avg = stats_map.average(stats_map.Key(0))
         max = stats_map.max(stats_map.Key(0))
-        self.assertGreater(sum.value, 0L)
-        self.assertGreater(max.value, 0L)
+        self.assertGreater(sum.value, int(0))
+        self.assertGreater(max.value, int(0))
         bpf_code.detach_kprobe("sys_clone")
 
     def test_struct_custom_func(self):
@@ -95,7 +95,7 @@ class TestPercpu(unittest.TestCase):
         f.close()
         self.assertEqual(len(stats_map),1)
         k = stats_map[ stats_map.Key(0) ]
-        self.assertGreater(k.c1, 0L)
+        self.assertGreater(k.c1, int(0))
         bpf_code.detach_kprobe("sys_clone")