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gh-123923: Defer refcounting for f_executable in _PyInterpreterFrame (#123924)

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Use a `_PyStackRef` and defer the reference to `f_executable` when
possible. This avoids some reference count contention in the common case
of executing the same code object from multiple threads concurrently in
the free-threaded build.
This commit is contained in:
Sam Gross 2024-09-12 12:37:06 -04:00 • committed by GitHub
parent 4ed7d1d6ac
commit b2afe2aae4
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GPG key ID: B5690EEEBB952194
18 changed files with 177 additions and 99 deletions
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6
Python/ceval.c
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@ -194,7 +194,7 @@ static void
lltrace_resume_frame(_PyInterpreterFrame *frame)
{
PyObject *fobj = frame->f_funcobj;
if (!PyCode_Check(frame->f_executable) ||
if (!PyStackRef_CodeCheck(frame->f_executable) ||
fobj == NULL ||
!PyFunction_Check(fobj)
) {
@ -784,7 +784,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
entry_frame.f_globals = (PyObject*)0xaaa3;
entry_frame.f_builtins = (PyObject*)0xaaa4;
#endif
entry_frame.f_executable = Py_None;
entry_frame.f_executable = PyStackRef_None;
entry_frame.instr_ptr = (_Py_CODEUNIT *)_Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS + 1;
entry_frame.stackpointer = entry_frame.localsplus;
entry_frame.owner = FRAME_OWNED_BY_CSTACK;
@ -1681,7 +1681,7 @@ clear_thread_frame(PyThreadState *tstate, _PyInterpreterFrame * frame)
tstate->c_recursion_remaining--;
assert(frame->frame_obj == NULL || frame->frame_obj->f_frame == frame);
_PyFrame_ClearExceptCode(frame);
Py_DECREF(frame->f_executable);
PyStackRef_CLEAR(frame->f_executable);
tstate->c_recursion_remaining++;
_PyThreadState_PopFrame(tstate, frame);
}