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gh-138115: Move stackref buffer to thread state to reduce interp stack usage by Fidget-Spinner · Pull Request #138116 · python/cpython · GitHub

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gh-138115: Move stackref buffer to thread state to reduce interp stack usage #138116

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gh-138115: Move stackref buffer to thread state to reduce interp stack usage #138116

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Move stackref buffer to thread state to reduce interp stack usage
Fidget-Spinner Aug 24, 2025
e1702fd
oopsie
Fidget-Spinner Aug 24, 2025
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7 changes: 7 additions & 0 deletions Include/internal/pycore_tstate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,10 @@ struct _gc_thread_state {
};
#endif

/* How much scratch space to give stackref to PyObject* conversion. */
#define MAX_STACKREF_SCRATCH 10


// Every PyThreadState is actually allocated as a _PyThreadStateImpl. The
// PyThreadState fields are exposed as part of the C API, although most fields
// are intended to be private. The _PyThreadStateImpl fields not exposed.
Expand All @@ -47,6 +51,9 @@ typedef struct _PyThreadStateImpl {
struct _qsbr_thread_state *qsbr; // only used by free-threaded build
struct llist_node mem_free_queue; // delayed free queue

// Scratch space to convert _PyStackRef to PyObject *
// +1 to account for possible vectorcalls.
PyObject *stackref_scratch[MAX_STACKREF_SCRATCH + 1];
#ifdef Py_GIL_DISABLED
// Stack references for the current thread that exist on the C stack
struct _PyCStackRef *c_stack_refs;
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6 changes: 2 additions & 4 deletions Python/ceval_macros.h
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Expand Up @@ -390,12 +390,10 @@ do { \

/* Stackref macros */

/* How much scratch space to give stackref to PyObject* conversion. */
#define MAX_STACKREF_SCRATCH 10

#define STACKREFS_TO_PYOBJECTS(ARGS, ARG_COUNT, NAME) \
/* +1 because vectorcall might use -1 to write self */ \
PyObject *NAME##_temp[MAX_STACKREF_SCRATCH+1]; \
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate; \
PyObject **NAME##_temp = _tstate->stackref_scratch; \
PyObject **NAME = _PyObjectArray_FromStackRefArray(ARGS, ARG_COUNT, NAME##_temp + 1);

#define STACKREFS_TO_PYOBJECTS_CLEANUP(NAME) \
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