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bpo-45522: Allow to disable freelists on build time (GH-29056)

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Freelists for object structs can now be disabled. A new ``configure``
option ``--without-freelists`` can be used to disable all freelists
except empty tuple singleton. Internal Py*_MAXFREELIST macros can now
be defined as 0 without causing compiler warnings and segfaults.

Signed-off-by: Christian Heimes <christian@python.org>
This commit is contained in:
Christian Heimes 2021-10-21 16:12:20 +03:00 • committed by GitHub
parent 5a14f71fe8
commit 9942f42a93
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15 changed files with 218 additions and 35 deletions
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13
Lib/test/test_sys.py
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@ -825,7 +825,18 @@ class SysModuleTest(unittest.TestCase):
from test.support.script_helper import assert_python_ok
args = ['-c', 'import sys; sys._debugmallocstats()']
ret, out, err = assert_python_ok(*args)
self.assertIn(b"free PyDictObjects", err)
# Output of sys._debugmallocstats() depends on configure flags.
# The sysconfig vars are not available on Windows.
if sys.platform != "win32":
with_freelists = sysconfig.get_config_var("WITH_FREELISTS")
with_pymalloc = sysconfig.get_config_var("WITH_PYMALLOC")
if with_freelists:
self.assertIn(b"free PyDictObjects", err)
if with_pymalloc:
self.assertIn(b'Small block threshold', err)
if not with_freelists and not with_pymalloc:
self.assertFalse(err)
# The function has no parameter
self.assertRaises(TypeError, sys._debugmallocstats, True)