gh-138050: [WIP] JIT - Streamline MAKE_WARM - move coldness check to executor creation (GH-138240)

Author: alonme

Include/internal/pycore_interp_structs.h

@@ -939,7 +939,7 @@ struct _is {
     struct _PyExecutorObject *executor_deletion_list_head;
     struct _PyExecutorObject *cold_executor;
     int executor_deletion_list_remaining_capacity;
-    size_t trace_run_counter;
+    size_t executor_creation_counter;
     _rare_events rare_events;
     PyDict_WatchCallback builtins_dict_watcher;
 

Include/internal/pycore_optimizer.h

@@ -90,8 +90,9 @@ PyAPI_FUNC(void) _Py_Executors_InvalidateCold(PyInterpreterState *interp);
 #endif
 
 // Used as the threshold to trigger executor invalidation when
-// trace_run_counter is greater than this value.
-#define JIT_CLEANUP_THRESHOLD 100000
+// executor_creation_counter is greater than this value.
+// This value is arbitrary and was not optimized.
+#define JIT_CLEANUP_THRESHOLD 1000
 
 #define TRACE_STACK_SIZE 5
 

Python/bytecodes.c

@@ -11,7 +11,6 @@
 #include "pycore_audit.h"         // _PySys_Audit()
 #include "pycore_backoff.h"
 #include "pycore_cell.h"          // PyCell_GetRef()
-#include "pycore_ceval.h"
 #include "pycore_code.h"
 #include "pycore_emscripten_signal.h"  // _Py_CHECK_EMSCRIPTEN_SIGNALS
 #include "pycore_function.h"
@@ -5362,10 +5361,6 @@ dummy_func(
 
         tier2 op(_MAKE_WARM, (--)) {
             current_executor->vm_data.warm = true;
-            // It's okay if this ends up going negative.
-            if (--tstate->interp->trace_run_counter == 0) {
-                _Py_set_eval_breaker_bit(tstate, _PY_EVAL_JIT_INVALIDATE_COLD_BIT);
-            }
         }
 
         tier2 op(_FATAL_ERROR, (--)) {

Python/ceval_gil.c

@@ -1398,7 +1398,7 @@ _Py_HandlePending(PyThreadState *tstate)
     if ((breaker & _PY_EVAL_JIT_INVALIDATE_COLD_BIT) != 0) {
         _Py_unset_eval_breaker_bit(tstate, _PY_EVAL_JIT_INVALIDATE_COLD_BIT);
         _Py_Executors_InvalidateCold(tstate->interp);
-        tstate->interp->trace_run_counter = JIT_CLEANUP_THRESHOLD;
+        tstate->interp->executor_creation_counter = JIT_CLEANUP_THRESHOLD;
     }
 
     /* GIL drop request */

Python/executor_cases.c.h

@@ -6,6 +6,7 @@
 #include "pycore_interp.h"
 #include "pycore_backoff.h"
 #include "pycore_bitutils.h"        // _Py_popcount32()
+#include "pycore_ceval.h"       // _Py_set_eval_breaker_bit
 #include "pycore_code.h"            // _Py_GetBaseCodeUnit
 #include "pycore_function.h"        // _PyFunction_LookupByVersion()
 #include "pycore_interpframe.h"
@@ -1343,6 +1344,14 @@ uop_optimize(
         return -1;
     }
     assert(length <= UOP_MAX_TRACE_LENGTH);
+
+    // Check executor coldness
+    PyThreadState *tstate = PyThreadState_Get();
+    // It's okay if this ends up going negative.
+    if (--tstate->interp->executor_creation_counter == 0) {
+        _Py_set_eval_breaker_bit(tstate, _PY_EVAL_JIT_INVALIDATE_COLD_BIT);
+    }
+
     *exec_ptr = executor;
     return 1;
 }

Python/optimizer.c

@@ -571,7 +571,7 @@ init_interpreter(PyInterpreterState *interp,
     interp->executor_list_head = NULL;
     interp->executor_deletion_list_head = NULL;
     interp->executor_deletion_list_remaining_capacity = 0;
-    interp->trace_run_counter = JIT_CLEANUP_THRESHOLD;
+    interp->executor_creation_counter = JIT_CLEANUP_THRESHOLD;
     if (interp != &runtime->_main_interpreter) {
         /* Fix the self-referential, statically initialized fields. */
         interp->dtoa = (struct _dtoa_state)_dtoa_state_INIT(interp);