RFR: 8302508: Add timestamp to the output TraceCompilerThreads

[Vladimir Kozlov]

On Wed, 8 Mar 2023 10:01:11 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Having timestamps added to the output of TraceCompilerThreads will be helpful in understanding how frequently the compiler threads are being added or removed.
>> 
>> I did that and also added UL output.
>> 
>> 
>> java -XX:+TraceCompilerThreads -XX:+PrintCompilation -version
>> 
>>      86 Added initial compiler thread C2 CompilerThread0
>>      86 Added initial compiler thread C1 CompilerThread0
>>      92    1       3       java.lang.Object::<init> (1 bytes)
>>      96    2       3       java.lang.String::coder (15 bytes)
>> 
>> java -Xlog:jit+thread=debug -Xlog:jit+compilation=debug -version
>> 
>> [0.078s][debug][jit,thread] Added initial compiler thread C2 CompilerThread0
>> [0.078s][debug][jit,thread] Added initial compiler thread C1 CompilerThread0
>> [0.083s][debug][jit,compilation]    1       3       java.lang.Object::<init> (1 bytes)
>> [0.087s][debug][jit,compilation]    2       3       java.lang.String::coder (15 bytes)
>> 
>> 
>> Tested tier1.
>
> Looks good to me.

Thank you @TobiHartmann  and @poonamparhar for reviews.

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PR: https://git.openjdk.org/jdk/pull/12898