Which patch are we talking about? In tracemalloc_track-3.patch, I see:

+   If memory block is already tracked, update the existing trace. */
+PyAPI_FUNC(int) _PyTraceMalloc_Track(void *ptr, size_t size);
+
+/* Untrack an allocated memory block in the tracemalloc module.
+   Do nothing if the block was not tracked.
+
+   Do nothing if tracemalloc is not tracing Python memory allocations. */
+PyAPI_FUNC(void) _PyTraceMalloc_Untrack(void *ptr);