Track when the asm interpreter transitions into C++ interpreter #436
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tekknolagi
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In debug(opt) mode, register a bpftrace event that fires when the assembly interpreter switches to the C++ interpreter. This also includes opcodes that have no assembly implementation (and therefore always switch to C++).
For richards.py this occurs 25330 times, according to the bpftrace script. It is not the hottest, but it is easy to implement. (smaller) ... @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_COMPARE_IN_MONOMORPHIC]: 14073 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_COMPARE_EQ_STR]: 17581 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_LOAD_ATTR_INSTANCE_TYPE]: 19845 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_LOAD_ATTR_INSTANCE_SLOT_DESCR]: 25330 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_BUILD_TUPLE]: 27540 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_GET_ITER]: 44881 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_INPLACE_OP_MONOMORPHIC]: 56030 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_BINARY_FLOORDIV_SMALLINT]: 57701 @interpreter_deopt[usdt:./build/bin/python:python:InterpreterDeopt_BINARY_OP_MONOMORPHIC]: 58618 (higher)
This brings it down from 19727 to 4101 transitions from asm to C++.
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We can measure which opcodes do this most frequently with bpftrace. This lets us see, for example, that we should probably implement a handler for
LOAD_ATTR_INSTANCE_SLOT_DESCR(included in this PR).