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Title: gh-139103: Use borrowed references for positional args in _PyStack_UnpackDict by colesbury · Pull Request #144407 · python/cpython · GitHub

Open Graph Title: gh-139103: Use borrowed references for positional args in _PyStack_UnpackDict by colesbury · Pull Request #144407 · python/cpython

X Title: gh-139103: Use borrowed references for positional args in _PyStack_UnpackDict by colesbury · Pull Request #144407 · python/cpython

Description: The positional arguments passed to _PyStack_UnpackDict are already kept alive by the caller, so we can avoid the extra reference count operations by using borrowed references instead of creating new ones. This reduces reference count contention in the free-threaded build when calling functions with keyword arguments. In particular, this avoids contention on the type argument to __new__ when instantiating namedtuples with keyword arguments. Issue: gh-139103

Open Graph Description: The positional arguments passed to _PyStack_UnpackDict are already kept alive by the caller, so we can avoid the extra reference count operations by using borrowed references instead of creating ne...

X Description: The positional arguments passed to _PyStack_UnpackDict are already kept alive by the caller, so we can avoid the extra reference count operations by using borrowed references instead of creating ne...

Opengraph URL: https://github.com/python/cpython/pull/144407

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