refact(util): ask global util.mman from mman module

Author: ankostis

Diff for: gitdb/util.py

@@ -14,20 +14,11 @@
 import sys
 
 from smmap import (
-    StaticWindowMapManager,
-    SlidingWindowMapManager,
+    managed_mmaps,
     SlidingWindowMapBuffer
 )
 
 
-# initialize our global memory manager instance
-# Use it to free cached (and unused) resources.
-if sys.version_info < (2, 6):
-    mman = StaticWindowMapManager()
-else:
-    mman = SlidingWindowMapManager()
-# END handle mman
-
 #{ Aliases
 
 hex_to_bin = binascii.a2b_hex
@@ -59,6 +50,9 @@
 
 log = logging.getLogger(__name__)
 
+#: Global MemoryManager, remember to ``mman.collect()`` it.
+mman = managed_mmaps(check_entered=False)
+
 #{ compatibility stuff ...