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gh-107674: Improve performance of `sys.settrace` (GH-114986)

This commit is contained in:
Tian Gao 2024-02-28 07:21:42 -08:00 committed by GitHub
parent 9578288a3e
commit 0a61e23700
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
7 changed files with 64 additions and 53 deletions
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1
Misc/NEWS.d/next/Core and Builtins/2024-02-04-07-45-29.gh-issue-107674.q8mCmi.rst Normal file
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@ -0,0 +1 @@
Improved the performance of :func:`sys.settrace` significantly

9
Python/bytecodes.c
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@ -143,6 +143,7 @@ dummy_func(
tier1 inst(RESUME, (--)) {
assert(frame == tstate->current_frame);
if (tstate->tracing == 0) {
uintptr_t global_version =
_Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) &
~_PY_EVAL_EVENTS_MASK;
@ -152,14 +153,14 @@ dummy_func(
int err = _Py_Instrument(_PyFrame_GetCode(frame), tstate->interp);
ERROR_IF(err, error);
next_instr = this_instr;
DISPATCH();
}
}
else {
if ((oparg & RESUME_OPARG_LOCATION_MASK) < RESUME_AFTER_YIELD_FROM) {
CHECK_EVAL_BREAKER();
}
this_instr->op.code = RESUME_CHECK;
}
}
inst(RESUME_CHECK, (--)) {
#if defined(__EMSCRIPTEN__)
@ -169,13 +170,13 @@ dummy_func(
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
uintptr_t version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
assert((version & _PY_EVAL_EVENTS_MASK) == 0);
DEOPT_IF(eval_breaker != version);
DEOPT_IF(eval_breaker != version && tstate->tracing == 0);
}
inst(INSTRUMENTED_RESUME, (--)) {
uintptr_t global_version = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) & ~_PY_EVAL_EVENTS_MASK;
uintptr_t code_version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
if (code_version != global_version) {
if (code_version != global_version && tstate->tracing == 0) {
if (_Py_Instrument(_PyFrame_GetCode(frame), tstate->interp)) {
GOTO_ERROR(error);
}

8
Python/ceval.c
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@ -800,8 +800,13 @@ resume_frame:
{
_Py_CODEUNIT *prev = frame->instr_ptr;
_Py_CODEUNIT *here = frame->instr_ptr = next_instr;
int original_opcode = 0;
if (tstate->tracing) {
PyCodeObject *code = _PyFrame_GetCode(frame);
original_opcode = code->_co_monitoring->lines[(int)(here - _PyCode_CODE(code))].original_opcode;
} else {
_PyFrame_SetStackPointer(frame, stack_pointer);
int original_opcode = _Py_call_instrumentation_line(
original_opcode = _Py_call_instrumentation_line(
tstate, frame, here, prev);
stack_pointer = _PyFrame_GetStackPointer(frame);
if (original_opcode < 0) {
@ -812,6 +817,7 @@ resume_frame:
if (next_instr != here) {
DISPATCH();
}
}
if (_PyOpcode_Caches[original_opcode]) {
_PyBinaryOpCache *cache = (_PyBinaryOpCache *)(next_instr+1);
/* Prevent the underlying instruction from specializing

4
Python/ceval_macros.h
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@ -339,6 +339,9 @@ do { \
// for an exception handler, displaying the traceback, and so on
#define INSTRUMENTED_JUMP(src, dest, event) \
do { \
if (tstate->tracing) {\
next_instr = dest; \
} else { \
_PyFrame_SetStackPointer(frame, stack_pointer); \
next_instr = _Py_call_instrumentation_jump(tstate, event, frame, src, dest); \
stack_pointer = _PyFrame_GetStackPointer(frame); \
@ -346,6 +349,7 @@ do { \
next_instr = (dest)+1; \
goto error; \
} \
} \
} while (0);
typedef PyObject *(*convertion_func_ptr)(PyObject *);

2
Python/executor_cases.c.h generated
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@ -20,7 +20,7 @@
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
uintptr_t version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
assert((version & _PY_EVAL_EVENTS_MASK) == 0);
if (eval_breaker != version) goto deoptimize;
if (eval_breaker != version && tstate->tracing == 0) goto deoptimize;
break;
}

9
Python/generated_cases.c.h generated
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@ -3125,7 +3125,7 @@
INSTRUCTION_STATS(INSTRUMENTED_RESUME);
uintptr_t global_version = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) & ~_PY_EVAL_EVENTS_MASK;
uintptr_t code_version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
if (code_version != global_version) {
if (code_version != global_version && tstate->tracing == 0) {
if (_Py_Instrument(_PyFrame_GetCode(frame), tstate->interp)) {
GOTO_ERROR(error);
}
@ -4780,6 +4780,7 @@
PREDICTED(RESUME);
_Py_CODEUNIT *this_instr = next_instr - 1;
assert(frame == tstate->current_frame);
if (tstate->tracing == 0) {
uintptr_t global_version =
_Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) &
~_PY_EVAL_EVENTS_MASK;
@ -4789,13 +4790,13 @@
int err = _Py_Instrument(_PyFrame_GetCode(frame), tstate->interp);
if (err) goto error;
next_instr = this_instr;
DISPATCH();
}
}
else {
if ((oparg & RESUME_OPARG_LOCATION_MASK) < RESUME_AFTER_YIELD_FROM) {
CHECK_EVAL_BREAKER();
}
this_instr->op.code = RESUME_CHECK;
}
DISPATCH();
}
@ -4811,7 +4812,7 @@
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
uintptr_t version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
assert((version & _PY_EVAL_EVENTS_MASK) == 0);
DEOPT_IF(eval_breaker != version, RESUME);
DEOPT_IF(eval_breaker != version && tstate->tracing == 0, RESUME);
DISPATCH();
}

4
Python/instrumentation.c
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@ -1156,15 +1156,13 @@ int
_Py_call_instrumentation_line(PyThreadState *tstate, _PyInterpreterFrame* frame, _Py_CODEUNIT *instr, _Py_CODEUNIT *prev)
{
PyCodeObject *code = _PyFrame_GetCode(frame);
assert(tstate->tracing == 0);
assert(is_version_up_to_date(code, tstate->interp));
assert(instrumentation_cross_checks(tstate->interp, code));
int i = (int)(instr - _PyCode_CODE(code));
_PyCoMonitoringData *monitoring = code->_co_monitoring;
_PyCoLineInstrumentationData *line_data = &monitoring->lines[i];
if (tstate->tracing) {
goto done;
}
PyInterpreterState *interp = tstate->interp;
int8_t line_delta = line_data->line_delta;
int line = compute_line(code, i, line_delta);