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GH-109369: Add machinery for deoptimizing tier2 executors, both individually and globally. by markshannon · Pull Request #110384 · python/cpython · GitHub

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26 changes: 26 additions & 0 deletions Include/cpython/optimizer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,27 @@
extern "C" {
#endif

typedef struct _PyExecutorLinkListNode {
struct _PyExecutorObject *next;
struct _PyExecutorObject *previous;
} _PyExecutorLinkListNode;


/* Bloom filter with m = 256
* https://en.wikipedia.org/wiki/Bloom_filter */
#define BLOOM_FILTER_WORDS 8

typedef struct _bloom_filter {
uint32_t bits[BLOOM_FILTER_WORDS];
} _PyBloomFilter;

typedef struct {
uint8_t opcode;
uint8_t oparg;
uint8_t valid;
uint8_t linked;
_PyBloomFilter bloom;
_PyExecutorLinkListNode links;
} _PyVMData;

typedef struct _PyExecutorObject {
Expand Down Expand Up @@ -45,6 +63,14 @@ _PyOptimizer_BackEdge(struct _PyInterpreterFrame *frame, _Py_CODEUNIT *src, _Py_

extern _PyOptimizerObject _PyOptimizer_Default;

void _Py_ExecutorInit(_PyExecutorObject *, _PyBloomFilter *);
void _Py_ExecutorClear(_PyExecutorObject *);
void _Py_BloomFilter_Init(_PyBloomFilter *);
void _Py_BloomFilter_Add(_PyBloomFilter *bloom, void *obj);
PyAPI_FUNC(void) _Py_Executor_DependsOn(_PyExecutorObject *executor, void *obj);
PyAPI_FUNC(void) _Py_Executors_InvalidateDependency(PyInterpreterState *interp, void *obj);
extern void _Py_Executors_InvalidateAll(PyInterpreterState *interp);

/* For testing */
PyAPI_FUNC(PyObject *)PyUnstable_Optimizer_NewCounter(void);
PyAPI_FUNC(PyObject *)PyUnstable_Optimizer_NewUOpOptimizer(void);
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1 change: 1 addition & 0 deletions Include/internal/pycore_interp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,7 @@ struct _is {
struct types_state types;
struct callable_cache callable_cache;
_PyOptimizerObject *optimizer;
_PyExecutorObject *executor_list_head;
uint16_t optimizer_resume_threshold;
uint16_t optimizer_backedge_threshold;
uint32_t next_func_version;
Expand Down
61 changes: 61 additions & 0 deletions Lib/test/test_capi/test_misc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2401,6 +2401,67 @@ def get_first_executor(func):
return None


class TestExecutorInvalidation(unittest.TestCase):

def setUp(self):
self.old = _testinternalcapi.get_optimizer()
self.opt = _testinternalcapi.get_counter_optimizer()
_testinternalcapi.set_optimizer(self.opt)

def tearDown(self):
_testinternalcapi.set_optimizer(self.old)

def test_invalidate_object(self):
# Generate a new set of functions at each call
ns = {}
func_src = "\n".join(
f"""
def f{n}():
for _ in range(1000):
pass
""" for n in range(5)
)
exec(textwrap.dedent(func_src), ns, ns)
funcs = [ ns[f'f{n}'] for n in range(5)]
objects = [object() for _ in range(5)]

for f in funcs:
f()
executors = [get_first_executor(f) for f in funcs]
# Set things up so each executor depends on the objects
# with an equal or lower index.
for i, exe in enumerate(executors):
self.assertTrue(exe.valid)
for obj in objects[:i+1]:
_testinternalcapi.add_executor_dependency(exe, obj)
self.assertTrue(exe.valid)
# Assert that the correct executors are invalidated
# and check that nothing crashes when we invalidate
# an executor mutliple times.
for i in (4,3,2,1,0):
_testinternalcapi.invalidate_executors(objects[i])
for exe in executors[i:]:
self.assertFalse(exe.valid)
for exe in executors[:i]:
self.assertTrue(exe.valid)

def test_uop_optimizer_invalidation(self):
# Generate a new function at each call
ns = {}
exec(textwrap.dedent("""
def f():
for i in range(1000):
pass
"""), ns, ns)
f = ns['f']
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
f()
exe = get_first_executor(f)
self.assertTrue(exe.valid)
_testinternalcapi.invalidate_executors(f.__code__)
self.assertFalse(exe.valid)

class TestUops(unittest.TestCase):

def test_basic_loop(self):
Expand Down
28 changes: 28 additions & 0 deletions Modules/_testinternalcapi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1002,6 +1002,32 @@ get_executor(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
return (PyObject *)PyUnstable_GetExecutor((PyCodeObject *)code, ioffset);
}

static PyObject *
add_executor_dependency(PyObject *self, PyObject *args)
{
PyObject *exec;
PyObject *obj;
if (!PyArg_ParseTuple(args, "OO", &exec, &obj)) {
return NULL;
}
/* No way to tell in general if exec is an executor, so we only accept
* counting_executor */
Comment thread
markshannon marked this conversation as resolved.
if (strcmp(Py_TYPE(exec)->tp_name, "counting_executor")) {
PyErr_SetString(PyExc_TypeError, "argument must be a counting_executor");
return NULL;
}
_Py_Executor_DependsOn((_PyExecutorObject *)exec, obj);
Py_RETURN_NONE;
}

static PyObject *
invalidate_executors(PyObject *self, PyObject *obj)
{
PyInterpreterState *interp = PyInterpreterState_Get();
_Py_Executors_InvalidateDependency(interp, obj);
Py_RETURN_NONE;
}

static int _pending_callback(void *arg)
{
/* we assume the argument is callable object to which we own a reference */
Expand Down Expand Up @@ -1565,6 +1591,8 @@ static PyMethodDef module_functions[] = {
{"get_executor", _PyCFunction_CAST(get_executor), METH_FASTCALL, NULL},
{"get_counter_optimizer", get_counter_optimizer, METH_NOARGS, NULL},
{"get_uop_optimizer", get_uop_optimizer, METH_NOARGS, NULL},
Comment thread
markshannon marked this conversation as resolved.
{"add_executor_dependency", add_executor_dependency, METH_VARARGS, NULL},
{"invalidate_executors", invalidate_executors, METH_O, NULL},
{"pending_threadfunc", _PyCFunction_CAST(pending_threadfunc),
METH_VARARGS | METH_KEYWORDS},
{"pending_identify", pending_identify, METH_VARARGS, NULL},
Expand Down
3 changes: 3 additions & 0 deletions Python/instrumentation.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1582,6 +1582,7 @@ _Py_Instrument(PyCodeObject *code, PyInterpreterState *interp)
if (code->co_executors != NULL) {
_PyCode_Clear_Executors(code);
}
_Py_Executors_InvalidateDependency(interp, code);
int code_len = (int)Py_SIZE(code);
/* code->_co_firsttraceable >= code_len indicates
* that no instrumentation can be inserted.
Expand Down Expand Up @@ -1803,6 +1804,7 @@ _PyMonitoring_SetEvents(int tool_id, _PyMonitoringEventSet events)
return -1;
}
set_global_version(interp, new_version);
_Py_Executors_InvalidateAll(interp);
return instrument_all_executing_code_objects(interp);
}

Expand Down Expand Up @@ -1832,6 +1834,7 @@ _PyMonitoring_SetLocalEvents(PyCodeObject *code, int tool_id, _PyMonitoringEvent
/* Force instrumentation update */
code->_co_instrumentation_version -= MONITORING_VERSION_INCREMENT;
}
_Py_Executors_InvalidateDependency(interp, code);
if (_Py_Instrument(code, interp)) {
return -1;
}
Expand Down
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