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gh-112529: Make the GC scheduling thread-safe (#114880)

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The GC keeps track of the number of allocations (less deallocations)
since the last GC. This buffers the count in thread-local state and uses
atomic operations to modify the per-interpreter count. The thread-local
buffering avoids contention on shared state.

A consequence is that the GC scheduling is not as precise, so
"test_sneaky_frame_object" is skipped because it requires that the GC be
run exactly after allocating a frame object.
This commit is contained in:
Sam Gross 2024-02-16 11:22:27 -05:00 • committed by GitHub
parent f92857a930
commit b24c9161a6
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7 changed files with 71 additions and 16 deletions
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Lib/test/test_frame.py
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@ -13,7 +13,7 @@ except ImportError:
_testcapi = None
from test import support
from test.support import threading_helper
from test.support import threading_helper, Py_GIL_DISABLED
from test.support.script_helper import assert_python_ok
@ -294,6 +294,7 @@ class TestIncompleteFrameAreInvisible(unittest.TestCase):
assert_python_ok("-c", code)
@support.cpython_only
@unittest.skipIf(Py_GIL_DISABLED, "test requires precise GC scheduling")
def test_sneaky_frame_object(self):
def trace(frame, event, arg):