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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
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Mark Shannon 2021-04-13 11:08:14 +01:00 • committed by GitHub
parent c2b7a66b91
commit 9e7b2076fb
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6 changed files with 61 additions and 35 deletions
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Python/pystate.c
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@ -624,7 +624,8 @@ new_threadstate(PyInterpreterState *interp, int init)
tstate->recursion_headroom = 0;
tstate->stackcheck_counter = 0;
tstate->tracing = 0;
tstate->use_tracing = 0;
tstate->root_cframe.use_tracing = 0;
tstate->cframe = &tstate->root_cframe;
tstate->gilstate_counter = 0;
tstate->async_exc = NULL;
tstate->thread_id = PyThread_get_thread_ident();