python · Eclips4 · Jan 18, 2025 · Dec 15, 2024
diff --git a/Include/cpython/pystats.h b/Include/cpython/pystats.h
@@ -18,6 +18,12 @@
 //
 // Define _PY_INTERPRETER macro to increment interpreter_increfs and
 // interpreter_decrefs. Otherwise, increment increfs and decrefs.
+//
+// The number of incref operations counted by `incref` and
+// `interpreter_incref` is the number of increment operations, which is
+// not equal to the total of all reference counts. A single increment
+// operation may increase the reference count of an object by more than
+// one. For example, see `_Py_RefcntAdd`.

 #ifndef Py_CPYTHON_PYSTATS_H
 #  error "this header file must not be included directly"

diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h
@@ -155,6 +155,10 @@ static inline void _Py_RefcntAdd(PyObject* op, Py_ssize_t n)
        _Py_atomic_add_ssize(&op->ob_ref_shared, (n << _Py_REF_SHARED_SHIFT));
    }
 #endif
+    // Although the ref count was increased by `n` (which may be greater than 1)
+    // it is only a single increment (i.e. addition) operation, so only 1 refcnt
+    // increment operation is counted.
+    _Py_INCREF_STAT_INC();
 }
 #define _Py_RefcntAdd(op, n) _Py_RefcntAdd(_PyObject_CAST(op), n)


diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2024-12-07-13-06-09.gh-issue-127599.tXCZb_.rst b/Misc/NEWS.d/next/Core_and_Builtins/2024-12-07-13-06-09.gh-issue-127599.tXCZb_.rst
@@ -0,0 +1,2 @@
+Fix statistics for increments of object reference counts (in particular, when
+a reference count was increased by more than 1 in a single operation).
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix statistics for increments of object reference counts (in particular, when
		a reference count was increased by more than 1 in a single operation).