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gh-124218: Refactor per-thread reference counting (#124844)

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Currently, we only use per-thread reference counting for heap type objects and
the naming reflects that. We will extend it to a few additional types in an
upcoming change to avoid scaling bottlenecks when creating nested functions.

Rename some of the files and functions in preparation for this change.
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Sam Gross 2024-10-01 13:05:42 -04:00 • committed by GitHub
parent 5aa91c56bf
commit b482538523
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15 changed files with 168 additions and 167 deletions
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14
Python/gc_free_threading.c
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@ -15,7 +15,7 @@
#include "pycore_tstate.h" // _PyThreadStateImpl
#include "pycore_weakref.h" // _PyWeakref_ClearRef()
#include "pydtrace.h"
#include "pycore_typeid.h" // _PyType_MergeThreadLocalRefcounts
#include "pycore_uniqueid.h" // _PyType_MergeThreadLocalRefcounts
#ifdef Py_GIL_DISABLED
@ -217,12 +217,12 @@ disable_deferred_refcounting(PyObject *op)
merge_refcount(op, 0);
}
// Heap types also use thread-local refcounting -- disable it here.
// Heap types also use per-thread refcounting -- disable it here.
if (PyType_Check(op)) {
// Disable thread-local refcounting for heap types
PyTypeObject *type = (PyTypeObject *)op;
if (PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
_PyType_ReleaseId((PyHeapTypeObject *)op);
if (PyType_HasFeature((PyTypeObject *)op, Py_TPFLAGS_HEAPTYPE)) {
PyHeapTypeObject *ht = (PyHeapTypeObject *)op;
_PyObject_ReleaseUniqueId(ht->unique_id);
ht->unique_id = -1;
}
}
@ -1221,7 +1221,7 @@ gc_collect_internal(PyInterpreterState *interp, struct collection_state *state,
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)p;
// merge per-thread refcount for types into the type's actual refcount
_PyType_MergeThreadLocalRefcounts(tstate);
_PyObject_MergePerThreadRefcounts(tstate);
// merge refcounts for all queued objects
merge_queued_objects(tstate, state);