This constrained API, I'm much more comfortable with. And the general goal, of turning instrumentation into something that doesn't complicate the JITs and indeed benefits from improvements to handling ordinary code, seems really good. However, I think the concerns Ted raised in comment 2 about coordinating this with other work do need to be addressed. Putting it off "indefinitely" is not what's being discussed. It's just that landing things blindly is also bad for parallel development. I'll get that started (in other channels).
Bug 1554524 Comment 19 Edit History
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This constrained API, I'm much more comfortable with. And the general goal, of turning instrumentation into something that doesn't complicate the JITs and indeed benefits from JIT improvements in the compilation of ordinary code, seems really good. However, I think the concerns Ted raised in comment 2 about coordinating this with other work do need to be addressed. Putting it off "indefinitely" is not what's being discussed. It's just that landing things blindly is also bad for parallel development. I'll get that started (in other channels).