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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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11
Python/frame.c
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@ -14,7 +14,10 @@ _PyFrame_Traverse(_PyInterpreterFrame *frame, visitproc visit, void *arg)
Py_VISIT(frame->frame_obj);
Py_VISIT(frame->f_locals);
Py_VISIT(frame->f_funcobj);
Py_VISIT(_PyFrame_GetCode(frame));
int err = _PyGC_VisitStackRef(&frame->f_executable, visit, arg);
if (err) {
return err;
}
return _PyGC_VisitFrameStack(frame, visit, arg);
}
@ -53,10 +56,10 @@ take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame)
assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT);
assert(frame->owner != FRAME_CLEARED);
Py_ssize_t size = ((char*)frame->stackpointer) - (char *)frame;
Py_INCREF(_PyFrame_GetCode(frame));
memcpy((_PyInterpreterFrame *)f->_f_frame_data, frame, size);
frame = (_PyInterpreterFrame *)f->_f_frame_data;
frame->stackpointer = (_PyStackRef *)(((char *)frame) + size);
frame->f_executable = PyStackRef_DUP(frame->f_executable);
f->f_frame = frame;
frame->owner = FRAME_OWNED_BY_FRAME_OBJECT;
if (_PyFrame_IsIncomplete(frame)) {
@ -131,9 +134,7 @@ _PyFrame_ClearExceptCode(_PyInterpreterFrame *frame)
PyObject *
PyUnstable_InterpreterFrame_GetCode(struct _PyInterpreterFrame *frame)
{
PyObject *code = frame->f_executable;
Py_INCREF(code);
return code;
return PyStackRef_AsPyObjectNew(frame->f_executable);
}
int