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gh-117783: Immortalize objects that use deferred reference counting (#118112)

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Deferred reference counting is not fully implemented yet. As a temporary
measure, we immortalize objects that would use deferred reference
counting to avoid multi-threaded scaling bottlenecks.

This is only performed in the free-threaded build once the first
non-main thread is started. Additionally, some tests, including refleak
tests, suppress this behavior.
This commit is contained in:
Sam Gross 2024-04-29 14:36:02 -04:00 • committed by GitHub
parent 8d4b756fd3
commit 7ccacb220d
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13 changed files with 134 additions and 8 deletions
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22
Modules/_testinternalcapi.c
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@ -1957,6 +1957,27 @@ get_py_thread_id(PyObject *self, PyObject *Py_UNUSED(ignored))
}
#endif
static PyObject *
set_immortalize_deferred(PyObject *self, PyObject *value)
{
#ifdef Py_GIL_DISABLED
PyInterpreterState *interp = PyInterpreterState_Get();
int old_enabled = interp->gc.immortalize.enabled;
int old_enabled_on_thread = interp->gc.immortalize.enable_on_thread_created;
int enabled_on_thread = 0;
if (!PyArg_ParseTuple(value, "i|i",
&interp->gc.immortalize.enabled,
&enabled_on_thread))
{
return NULL;
}
interp->gc.immortalize.enable_on_thread_created = enabled_on_thread;
return Py_BuildValue("ii", old_enabled, old_enabled_on_thread);
#else
return Py_BuildValue("OO", Py_False, Py_False);
#endif
}
static PyObject *
has_inline_values(PyObject *self, PyObject *obj)
{
@ -2050,6 +2071,7 @@ static PyMethodDef module_functions[] = {
#ifdef Py_GIL_DISABLED
{"py_thread_id", get_py_thread_id, METH_NOARGS},
#endif
{"set_immortalize_deferred", set_immortalize_deferred, METH_VARARGS},
{"uop_symbols_test", _Py_uop_symbols_test, METH_NOARGS},
{NULL, NULL} /* sentinel */
};