python
diff --git a/‎Include/internal/pycore_freelist_state.h‎
Lines changed: 2 additions & 0 deletions b/‎Include/internal/pycore_freelist_state.h‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎Objects/object.c‎
Lines changed: 1 addition & 0 deletions b/‎Objects/object.c‎
Lines changed: 1 addition & 0 deletions
diff --git a/‎Objects/unicodeobject.c‎
Lines changed: 9 additions & 4 deletions b/‎Objects/unicodeobject.c‎
Lines changed: 9 additions & 4 deletions
@@ -20,6 +20,7 @@ extern "C" {
 #  define Py_async_gen_asends_MAXFREELIST 80
 #  define Py_futureiters_MAXFREELIST 255
 #  define Py_object_stack_chunks_MAXFREELIST 4
+#  define Py_unicode_writers_MAXFREELIST 1
 
 // A generic freelist of either PyObjects or other data structures.
 struct _Py_freelist {
@@ -44,6 +45,7 @@ struct _Py_freelists {
     struct _Py_freelist async_gen_asends;
     struct _Py_freelist futureiters;
     struct _Py_freelist object_stack_chunks;
+    struct _Py_freelist unicode_writers;
 };
 
 #ifdef __cplusplus
 
@@ -862,6 +862,7 @@ _PyObject_ClearFreeLists(struct _Py_freelists *freelists, int is_finalization)
         // stacks during GC, so emptying the free-list is counterproductive.
         clear_freelist(&freelists->object_stack_chunks, 1, PyMem_RawFree);
     }
+    clear_freelist(&freelists->unicode_writers, is_finalization, PyMem_Free);
 }
 
 /*
 
@@ -46,6 +46,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include "pycore_codecs.h"        // _PyCodec_Lookup()
 #include "pycore_critical_section.h" // Py_*_CRITICAL_SECTION_SEQUENCE_FAST
 #include "pycore_format.h"        // F_LJUST
+#include "pycore_freelist.h"      // _Py_FREELIST_FREE(), _Py_FREELIST_POP()
 #include "pycore_initconfig.h"    // _PyStatus_OK()
 #include "pycore_interp.h"        // PyInterpreterState.fs_codec
 #include "pycore_long.h"          // _PyLong_FormatWriter()
@@ -13436,9 +13437,13 @@ PyUnicodeWriter_Create(Py_ssize_t length)
     }
 
     const size_t size = sizeof(_PyUnicodeWriter);
-    PyUnicodeWriter *pub_writer = (PyUnicodeWriter *)PyMem_Malloc(size);
+    PyUnicodeWriter *pub_writer;
+    pub_writer = _Py_FREELIST_POP_MEM(unicode_writers);
     if (pub_writer == NULL) {
-        return (PyUnicodeWriter *)PyErr_NoMemory();
+        pub_writer = (PyUnicodeWriter *)PyMem_Malloc(size);
+        if (pub_writer == NULL) {
+            return (PyUnicodeWriter *)PyErr_NoMemory();
+        }
     }
     _PyUnicodeWriter *writer = (_PyUnicodeWriter *)pub_writer;
 
@@ -13459,7 +13464,7 @@ void PyUnicodeWriter_Discard(PyUnicodeWriter *writer)
         return;
     }
     _PyUnicodeWriter_Dealloc((_PyUnicodeWriter*)writer);
-    PyMem_Free(writer);
+    _Py_FREELIST_FREE(unicode_writers, writer, PyMem_Free);
 }
 
 
@@ -13881,7 +13886,7 @@ PyUnicodeWriter_Finish(PyUnicodeWriter *writer)
 {
     PyObject *str = _PyUnicodeWriter_Finish((_PyUnicodeWriter*)writer);
     assert(((_PyUnicodeWriter*)writer)->buffer == NULL);
-    PyMem_Free(writer);
+    _Py_FREELIST_FREE(unicode_writers, writer, PyMem_Free);
     return str;
 }
Original file line number	Diff line number	Diff line change
`@@ -862,6 +862,7 @@ _PyObject_ClearFreeLists(struct _Py_freelists *freelists, int is_finalization)`
`862`	`862`	`// stacks during GC, so emptying the free-list is counterproductive.`
`863`	`863`	`clear_freelist(&freelists->object_stack_chunks, 1, PyMem_RawFree);`
`864`	`864`	`}`
	`865`	`+ clear_freelist(&freelists->unicode_writers, is_finalization, PyMem_Free);`
`865`	`866`	`}`
`866`	`867`
`867`	`868`	`/*`
Original file line number	Diff line number	Diff line change
`@@ -46,6 +46,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.`
`46`	`46`	`#include "pycore_codecs.h" // _PyCodec_Lookup()`
`47`	`47`	`#include "pycore_critical_section.h" // Py_*_CRITICAL_SECTION_SEQUENCE_FAST`
`48`	`48`	`#include "pycore_format.h" // F_LJUST`
	`49`	`+#include "pycore_freelist.h" // _Py_FREELIST_FREE(), _Py_FREELIST_POP()`
`49`	`50`	`#include "pycore_initconfig.h" // _PyStatus_OK()`
`50`	`51`	`#include "pycore_interp.h" // PyInterpreterState.fs_codec`
`51`	`52`	`#include "pycore_long.h" // _PyLong_FormatWriter()`
`@@ -13436,9 +13437,13 @@ PyUnicodeWriter_Create(Py_ssize_t length)`
`13436`	`13437`	`}`
`13437`	`13438`
`13438`	`13439`	`const size_t size = sizeof(_PyUnicodeWriter);`
`13439`		`- PyUnicodeWriter pub_writer = (PyUnicodeWriter )PyMem_Malloc(size);`
	`13440`	`+ PyUnicodeWriter *pub_writer;`
	`13441`	`+ pub_writer = _Py_FREELIST_POP_MEM(unicode_writers);`
`13440`	`13442`	`if (pub_writer == NULL) {`
`13441`		`- return (PyUnicodeWriter *)PyErr_NoMemory();`
	`13443`	`+ pub_writer = (PyUnicodeWriter *)PyMem_Malloc(size);`
	`13444`	`+ if (pub_writer == NULL) {`
	`13445`	`+ return (PyUnicodeWriter *)PyErr_NoMemory();`
	`13446`	`+ }`
`13442`	`13447`	`}`
`13443`	`13448`	`_PyUnicodeWriter writer = (_PyUnicodeWriter )pub_writer;`
`13444`	`13449`
`@@ -13459,7 +13464,7 @@ void PyUnicodeWriter_Discard(PyUnicodeWriter *writer)`
`13459`	`13464`	`return;`
`13460`	`13465`	`}`
`13461`	`13466`	`_PyUnicodeWriter_Dealloc((_PyUnicodeWriter*)writer);`
`13462`		`- PyMem_Free(writer);`
	`13467`	`+ _Py_FREELIST_FREE(unicode_writers, writer, PyMem_Free);`
`13463`	`13468`	`}`
`13464`	`13469`
`13465`	`13470`
`@@ -13881,7 +13886,7 @@ PyUnicodeWriter_Finish(PyUnicodeWriter *writer)`
`13881`	`13886`	`{`
`13882`	`13887`	`PyObject str = _PyUnicodeWriter_Finish((_PyUnicodeWriter)writer);`
`13883`	`13888`	`assert(((_PyUnicodeWriter*)writer)->buffer == NULL);`
`13884`		`- PyMem_Free(writer);`
	`13889`	`+ _Py_FREELIST_FREE(unicode_writers, writer, PyMem_Free);`
`13885`	`13890`	`return str;`
`13886`	`13891`	`}`
`13887`	`13892`