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bpo-43760: Speed up check for tracing in interpreter dispatch (#25276)

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* Remove redundant tracing_possible field from interpreter state.

* Move 'use_tracing' from tstate onto C stack, for fastest possible checking in dispatch logic.

* Add comments stressing the importance stack discipline when dealing with CFrames.

* Add NEWS
This commit is contained in:
Mark Shannon 2021-04-13 11:08:14 +01:00 • committed by GitHub
parent c2b7a66b91
commit 9e7b2076fb
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 61 additions and 35 deletions
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8
Python/sysmodule.c
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@ -252,7 +252,7 @@ sys_audit_tstate(PyThreadState *ts, const char *event,
/* Disallow tracing in hooks unless explicitly enabled */
ts->tracing++;
ts->use_tracing = 0;
ts->cframe->use_tracing = 0;
while ((hook = PyIter_Next(hooks)) != NULL) {
_Py_IDENTIFIER(__cantrace__);
PyObject *o;
@ -265,14 +265,14 @@ sys_audit_tstate(PyThreadState *ts, const char *event,
break;
}
if (canTrace) {
ts->use_tracing = (ts->c_tracefunc || ts->c_profilefunc);
ts->cframe->use_tracing = (ts->c_tracefunc || ts->c_profilefunc);
ts->tracing--;
}
PyObject* args[2] = {eventName, eventArgs};
o = _PyObject_FastCallTstate(ts, hook, args, 2);
if (canTrace) {
ts->tracing++;
ts->use_tracing = 0;
ts->cframe->use_tracing = 0;
}
if (!o) {
break;
@ -280,7 +280,7 @@ sys_audit_tstate(PyThreadState *ts, const char *event,
Py_DECREF(o);
Py_CLEAR(hook);
}
ts->use_tracing = (ts->c_tracefunc || ts->c_profilefunc);
ts->cframe->use_tracing = (ts->c_tracefunc || ts->c_profilefunc);
ts->tracing--;
if (_PyErr_Occurred(ts)) {
goto exit;