One worry that I have in general with this move
is the usage of _PyType_GetModuleByDef to get the type object
from the module definition. This normally involves getting a TLS in every
instance creation,
which can impact notably performance for some perf-sensitive types or types
that are created a lot.
On Tue, 12 Jan 2021 at 18:21, Neil Schemenauer <nas-pyt...@arctrix.com>
wrote:
> On 2021-01-12, Victor Stinner wrote:
> > It seems like a safer approach is to continue the work on
> > bpo-40077: "Convert static types to PyType_FromSpec()".
>
> I agree that trying to convert static types is a good idea. Another
> possible bonus might be that we can gain some performance by
> integrating garbage collection with the Python object memory
> allocator. Static types frustrate that effort.
>
> Could we have something easier to use than PyType_FromSpec(), for
> the purposes of coverting existing code? I was thinking of
> something like:
>
> static PyTypeObject Foo_TypeStatic = {
> }
> static PyTypeObject *Foo_Type;
>
> PyInit_foo(void)
> {
> Foo_Type = PyType_FromStatic(&Foo_TypeStatic);
> }
>
>
> The PyType_FromStatic() would return a new heap type, created by
> copying the static type. The static type could be marked as being
> unusable (e.g. with a type flag).
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