RFR: 7903696: JMH: Add xctrace-based perfasm profiler for macOS [v3]

[Aleksey Shipilev]

On Tue, 23 Apr 2024 11:53:12 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> @tsitelov, first of all, thanks for your interest in the profiler!
>> 
>>> My question was mostly about the prerequisites required to use the xctrace profiling feature:
>>> 
>>> - do I need to install any prerequisites except XCode?
>>> - shall I create some specific instruments.app profile?
>> 
>> `Xcode` is the only prerequisite. You can use either `Time Profiler` (it will be used by default) or `CPU Profiler` templates without configuring anything in the `Instruments.app`. A template name could be specified using `template` parameter.
>> 
>>> Extra: can Instruments' CPU counters facility be used to profile cache misses and so on?
>> 
>> In that case you have to configure and save a new template in the `Instruments.app` and then supply its name or a path to it to xctraceprof's `template` parameter. The only caveat is that the same PMU counter should be configured as both a PMI trigger and a sampled event in Instrument's recording settings.
>
> @fzhinkin, as per [bot's comment](https://github.com/openjdk/jmh/pull/130#issuecomment-2002026686) if you say `/integrate`, you would be able to integrate.

> @shipilev, thank you for reviewing and accepting the change!

Sure thing. Let's try to figure out `xctracenorm`?

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PR Comment: https://git.openjdk.org/jmh/pull/130#issuecomment-2072401519