bpo-40602: _Py_hashtable_new() uses PyMem_Malloc()

_Py_hashtable_new() now uses PyMem_Malloc/PyMem_Free allocator by default, rather than PyMem_RawMalloc/PyMem_RawFree. PyMem_Malloc is faster than PyMem_RawMalloc for memory blocks smaller than or equal to 512 bytes.
python · vstinner · May 12, 2020 · May 12, 2020 · May 12, 2020 · 892dbb41bc633cdeded2446eabe6c72adbd44bd2
commit 892dbb41bc633cdeded2446eabe6c72adbd44bd2
diff --git a/Python/hashtable.c b/Python/hashtable.c
@@ -149,11 +149,12 @@ _Py_hashtable_new_full(size_t key_size, size_t data_size,
    _Py_hashtable_allocator_t alloc;

    if (allocator == NULL) {
-        alloc.malloc = PyMem_RawMalloc;
-        alloc.free = PyMem_RawFree;
+        alloc.malloc = PyMem_Malloc;
+        alloc.free = PyMem_Free;
    }
-    else
+    else {
        alloc = *allocator;
+    }

    ht = (_Py_hashtable_t *)alloc.malloc(sizeof(_Py_hashtable_t));
    if (ht == NULL)