On Tue, 12 Jan 2021 18:48:39 +0000
Pablo Galindo Salgado <pablog...@gmail.com> wrote:
> 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.

If it's inlined C TLS it should be fast (*).  If it's Python's emulated
TLS then probably not :-)

(*) see https://godbolt.org/z/d7eKx7

Regards

Antoine.

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