[issue39465] Design a subinterpreter friendly alternative to _Py_IDENTIFIER

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

> The GIL avoids any risk of race condition, no?

Looks like the GIL would affect performance more or less?

>_Py_IDENTIFIER() would only be a "key" and _PyUnicode_FromId() would >store the value somewhere in a hash table stored in PyInterpreterState.

+1.

IMHO, for those two cases, the simplest idea is move IDENTIFIER to moduleState which would increase more memory usage than InterpreterState.

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