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GH-126491: GC: Mark objects reachable from roots before doing cycle collection (GH-126502)

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* Mark almost all reachable objects before doing collection phase

* Add stats for objects marked

* Visit new frames before each increment

* Remove lazy dict tracking

* Update docs

* Clearer calculation of work to do.
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Mark Shannon 2024-11-18 14:31:26 +00:00 • committed by GitHub
parent a1d9c8aa80
commit b0fcc2c47a
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21 changed files with 332 additions and 330 deletions
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4
Python/bytecodes.c
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@ -2340,10 +2340,6 @@ dummy_func(
DEOPT_IF(ep->me_key != name);
PyObject *old_value = ep->me_value;
DEOPT_IF(old_value == NULL);
/* Ensure dict is GC tracked if it needs to be */
if (!_PyObject_GC_IS_TRACKED(dict) && _PyObject_GC_MAY_BE_TRACKED(PyStackRef_AsPyObjectBorrow(value))) {
_PyObject_GC_TRACK(dict);
}
_PyDict_NotifyEvent(tstate->interp, PyDict_EVENT_MODIFIED, dict, name, PyStackRef_AsPyObjectBorrow(value));
ep->me_value = PyStackRef_AsPyObjectSteal(value);
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,