gh-145685: Avoid contention on TYPE_LOCK in super() lookups

[colesbury]

• Issue: Unexpected scaling bottleneck in _PyType_Lookup / _PyType_LookupStackRefAndVersion #145685

[mpage]

LGTM. Should we add a test to the scaling benchmark that reproduces the issue?

[mpage]

Doesn't need to be in this PR, but would it be worth adding another function that combines these two operations?

[colesbury]

Yeah, makes sense.

[colesbury]

This is enough to fix super() on different classes, but not enough for the straightforward super() on the same class. That'll require some additional fixes. I'll add the scaling benchmark in a follow up together with those fixes:

classBase:
defmethod(self):
return1classDerived(Base):
defmethod(self):
returnsuper().method()
@register_benchmarkdefsuper_call():
obj=Derived()
for_inrange(1000*WORK_SCALE):
obj.method()

[colesbury]

Actually, maybe it's worth adding the different class benchmark now and I'll update it later.

[miss-islington-app]

Thanks @colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @colesbury, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker bdf6de8c3f0c2ec0d737f38014a32c1eed02c7f1 3.14

[bedevere-app]

GH-145804 is a backport of this pull request to the 3.14 branch.