Note what could be pre-allocated.

python · ericsnowcurrently · Jan 12, 2022 · Nov 18, 2021 · Nov 18, 2021 · Nov 17, 2021
commit 18080a1ca3f8af91b45520b74bbeea3e42990a89
@@ -178,6 +178,8 @@ struct _ts {
 
     // This must be last.
     struct {
+        // XXX Move exc_state and root_cframe down here.
+        // XXX Allocate the initial datastack_chunk here..
     } _preallocated;
 };
 

@@ -173,6 +173,7 @@ struct _is {
     struct {
         int initialized;
         PyThreadState tstate;
+        // XXX Pre-allocate as many objects as possible here.
     } _preallocated;
 };
 

@@ -123,6 +123,7 @@ typedef struct pyruntimestate {
     struct {
         struct _Py_global_objects global_objects;
         struct _is interpreters_main;
+        // XXX Pre-allocate as many objects as possible here.
     } _preallocated;
     // If anything gets added after _preallocated
     // then _PyRuntimeState_reset() needs to get updated to clear it.