When new objects are created, the allocation code ends calling into_Py_NewReference (with some exceptions).tracemalloc has a hook into this function to correlate allocations and traces (that do not know anything about objects or references) with newly created objects. This happens here:

This allowstracemalloc to be able to return the traceback where objects where allocated, which is great. Unfortunately other debuggers and profilers do not have this capability as there is no way to leverage trace malloc functionality or to hook into object creation.

I propose to expose an API (unclear what layer of the C-API this should be in) where callbacks can be registered to be called in_Py_NewReference and switch tracemalloc to use this API.

Linked PRs

• gh-93502: Add new C-API functions to trace object creation and destruction #115945