RFR 8221623 : Add StackWalker micro benchmarks to jdk repo

[Brent Christian]

On 9/23/19 4:48 PM, Mandy Chung wrote:
> 
> I think doing the measurement for one of these would be adequate.
> 
> StackWalkBench.forEach_AllOpts
> StackWalkBench.forEach_DefaultOpts
> StackWalkBench.forEach_HiddenAndReflectFrames

OK, reduced to just DefaultOpts.

> There are a couple of commented benchmarks.  Should they be taken out?

Sure; testGoThereBH() was from some early experimenting and is not 
needed - removed.

The getCallerClass() tests in ThrowableRuntimeMicros served as a 
reminder that they need updating, but having JDK-8230976 filed is 
sufficient.

IMO, it would be nice to have the PerfCounter example in StackWalkBench 
ready-to-uncomment, in case it's needed again sometime.

>> Though really, since logging is no longer using Throwable to examine 
>> the call stack, maybe it makes more sense to move the logging 
>> benchmarks to their own file under:
>>
>> test/micro/org/openjdk/bench/java/util/logging/
> 
> That seems a good idea.

Yes, those are moved.


http://cr.openjdk.java.net/~bchristi/8221623/webrev11/

Thanks,
-Brent