RFR: 8025692: Add trace to find out what methods are used at runtime.

[Yumin Qi]

Hi, Karen

   Just informed you that RBT testing for quick testing seems will not 
get back a completed result(I have tried several times those days).
   After 11 hours, there still 4 jobs running:

   26 of 34 succeeded, 4 failed, 4 still running.

   Those running jobs already run at least 6+ hours.
   The 4 failed jobs are dtrace on linux-x64  which are OK, since dtrace 
is disabled on it.

   Also, I added -Xint to test case, and tested with jtreg on 
test/runtime showed no new failures found.
   I am going to push the changes if you are OK with current result. 
Seems the testing with RBT will never come back. Updated webrev:

   http://cr.openjdk.java.net/~minqi/8025692/webrev02/

Thanks
Yumin

On 6/18/2015 1:01 PM, Karen Kinnear wrote:
> Yumin,
>
> Thank you very much for the updates.And the PERM_REFCOUNT rather than -1 :-)
> Looks good.
>
> Thank you for testing this -Xint. If there is an easy way to add an -Xint line
> to the test that would be useful - but not critical.
>
> So I presume that the "aurora default test suites" includes:
> jcks, jtreg hotspot and Christian's new "quick" tests.
>
> thanks,
> Karen
>
> On Jun 4, 2015, at 11:12 PM, Yumin Qi wrote:
>
>> HI, All
>>
>>   After several round of codereviews and discussion, now the second version is at:
>>   http://cr.openjdk.java.net/~minqi/8025692/webrev02/
>>
>>   The flag names changed:
>>
>>   TraceMethodUsge => LogTouchedMethods
>>   PrintMethodUsageAtExit => PrintTouchedMethodsAtExit
>>
>>   The two flags now are diagnostic flags.
>>
>>    Also similar, there changed in related variable names.
>>    Also fixed a flaw which is not found during last round of review: append new TouchedMethodRecord to end of hash bucket list.
>>
>>   Make change to interpreter method entry  generation(for both native and normal) to enable build_method_counter called. This is necessary since if run -Xint, the call will be skipped so our code will be skipped so no logging for touched methods.
>>
>>   Added test case for jcmd: jcmd <pid> VM.print_touched_methods.
>>
>>   Tests: JPRT, aurora default test suites (in progress).
>>
>> Thanks
>> Yumin
>>
>>
>> On 3/26/2015 7:34 PM, Yumin Qi wrote:
>>> Please review:
>>>
>>> bug: https://bugs.openjdk.java.net/browse/JDK-8025692
>>> webrev: http://cr.openjdk.java.net/~minqi/8025692/webrev01/
>>>
>>> Summary: Add two flags to help list all java methods called in runtime, this is also in product and can help CDS to rearrange methods in shared archive to avoid loading infrequent methods into memory.
>>>
>>> Tests: vm.runtime.quick.testlist, JPRT
>>>
>>>
>>> Thanks
>>> Yumin
>>>
>>>