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gh-126703: Add freelist for PyMethodObject (#128594)

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Pieter Eendebak 2025-01-12 14:01:49 +01:00 • committed by GitHub
parent 5ace71713b
commit ff39e3ff7b
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4 changed files with 12 additions and 3 deletions
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2
Include/internal/pycore_freelist_state.h
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@ -22,6 +22,7 @@ extern "C" {
# define Py_futureiters_MAXFREELIST 255
# define Py_object_stack_chunks_MAXFREELIST 4
# define Py_unicode_writers_MAXFREELIST 1
# define Py_pymethodobjects_MAXFREELIST 20
// A generic freelist of either PyObjects or other data structures.
struct _Py_freelist {
@ -48,6 +49,7 @@ struct _Py_freelists {
struct _Py_freelist futureiters;
struct _Py_freelist object_stack_chunks;
struct _Py_freelist unicode_writers;
struct _Py_freelist pymethodobjects;
};
#ifdef __cplusplus

1
Misc/NEWS.d/next/Core_and_Builtins/2025-01-07-19-48-56.gh-issue-126703.0ISs-7.rst Normal file
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@ -0,0 +1 @@
Improve performance of class methods by using a freelist.

11
Objects/classobject.c
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@ -3,6 +3,7 @@
#include "Python.h"
#include "pycore_call.h" // _PyObject_VectorcallTstate()
#include "pycore_ceval.h" // _PyEval_GetBuiltin()
#include "pycore_freelist.h"
#include "pycore_object.h"
#include "pycore_pyerrors.h"
#include "pycore_pystate.h" // _PyThreadState_GET()
@ -112,9 +113,12 @@ PyMethod_New(PyObject *func, PyObject *self)
PyErr_BadInternalCall();
return NULL;
}
PyMethodObject *im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);
PyMethodObject *im = _Py_FREELIST_POP(PyMethodObject, pymethodobjects);
if (im == NULL) {
return NULL;
im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);
if (im == NULL) {
return NULL;
}
}
im->im_weakreflist = NULL;
im->im_func = Py_NewRef(func);
@ -245,7 +249,8 @@ method_dealloc(PyObject *self)
PyObject_ClearWeakRefs((PyObject *)im);
Py_DECREF(im->im_func);
Py_XDECREF(im->im_self);
PyObject_GC_Del(im);
assert(Py_IS_TYPE(self, &PyMethod_Type));
_Py_FREELIST_FREE(pymethodobjects, (PyObject *)im, PyObject_GC_Del);
}
static PyObject *

1
Objects/object.c
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@ -937,6 +937,7 @@ _PyObject_ClearFreeLists(struct _Py_freelists *freelists, int is_finalization)
}
clear_freelist(&freelists->unicode_writers, is_finalization, PyMem_Free);
clear_freelist(&freelists->ints, is_finalization, free_object);
clear_freelist(&freelists->pymethodobjects, is_finalization, free_object);
}
/*