PING: RFR: JDK-8164913: JVMTI.agent_load dcmd should show useful error message

[serguei.spitsyn at oracle.com]

On 9/7/16 00:45, Dmitry Samersoff wrote:
> Serguei,
>
> I'm OK with the fix and OK to be listed as a reviewer.

Thanks, Dmitry!
Serguei
>
> -Dmitry
>
> On 2016-09-07 07:08, serguei.spitsyn at oracle.com wrote:
>> Hi Dmitry,
>>
>> As a sponsor I'm going to push this fix if you are Ok with the fix.
>> Please, let me know if you still have any concerns.
>> Also, confirm if you are Ok to be in the list of reviewers.
>>
>>
>> On 9/5/16 06:46, Dmitry Samersoff wrote:
>>> Yasumasa,
>>>
>>> I'll look closely to the fix.
>>>
>>> Please, notice:
>>>
>>> 1. We typically avoid printing attach error messages on
>>> the target VM side.
>> Some message was already printed:
>>
>> 2410 // Agent_OnAttach executed so completion status is JNI_OK
>> 2411 st->print_cr("%d", result);
>> 2412 result = JNI_OK;
>>
>> It is just a replacement. :)
>>
>>
>>> 2. We are in RDP1 for jdk9.
>>>
>>>     http://mail.openjdk.java.net/pipermail/jdk9-dev/2016-August/004777.html
>> I've set the priority to P3, so it can be pushed to the jdk9/hs.
>>
>> Thanks,
>> Serguei
>>
>>> -Dmitry
>>>
>>> On 2016-09-05 16:25, Yasumasa Suenaga wrote:
>>>> PING: Could you review and sponsor it?
>>>>
>>>>>        http://cr.openjdk.java.net/~ysuenaga/JDK-8164913/webrev.01/
>>>> Thanks,
>>>>
>>>> Yasumasa
>>>>
>>>>
>>>> On 2016/09/01 12:47, Yasumasa Suenaga wrote:
>>>>> Hi all,
>>>>>
>>>>> I think RDP1 has been started.
>>>>> Cannot I fix this?
>>>>>
>>>>> This problem is that jcmd shows incorrect status when JVMTI agent
>>>>> cannot be attached.
>>>>> I think this problem should be fixed in 9 GA.
>>>>> The users who want.to <http://want.to> attach JVMTI agent want to know
>>>>> whether it succeed.
>>>>>
>>>>> Yasumasa
>>>>>
>>>>>
>>>>> 2016/08/29 15:42 "Yasumasa Suenaga" <yasuenag at gmail.com
>>>>> <mailto:yasuenag at gmail.com>>:
>>>>>
>>>>>          This comment no longer matches the code and should be deleted:
>>>>>
>>>>>          2412       // Agent_OnAttach executed so completion status is
>>>>> JNI_OK
>>>>>          2413       st->print_cr("return code: %d", result);
>>>>>
>>>>>
>>>>>      Thanks David!
>>>>>      I removed it in new webrev.
>>>>>
>>>>>        http://cr.openjdk.java.net/~ysuenaga/JDK-8164913/webrev.01/
>>>>> <http://cr.openjdk.java.net/~ysuenaga/JDK-8164913/webrev.01/>
>>>>>
>>>>>
>>>>>      Yasumasa
>>>>>
>>>>>
>>>>>      On 2016/08/29 12:59, David Holmes wrote:
>>>>>
>>>>>          Hi Yasumasa,
>>>>>
>>>>>          On 28/08/2016 10:47 PM, Yasumasa Suenaga wrote:
>>>>>
>>>>>              Hi all,
>>>>>
>>>>>              If we try to attach invalid JVMTI agent via
>>>>> JVMTI.agent_load dcmd, we
>>>>>              will get
>>>>>              "Command executed successfully". However, it implies error in
>>>>>              JVMTIAgentLoadDCmd.
>>>>>
>>>>>              This message is from JCmd.java when jcmd does not receive
>>>>> output from
>>>>>              target VM.
>>>>>              So we should send error message from JVMTIAgentLoadDCmd.
>>>>>
>>>>>              I uploaded a webrev for it. Could you review it?
>>>>>
>>>>>               
>>>>> http://cr.openjdk.java.net/~ysuenaga/JDK-8164913/webrev.00/
>>>>> <http://cr.openjdk.java.net/~ysuenaga/JDK-8164913/webrev.00/>
>>>>>
>>>>>
>>>>>          This seems reasonable.
>>>>>
>>>>>          src/share/vm/prims/jvmtiExport.cpp
>>>>>
>>>>>          This comment no longer matches the code and should be deleted:
>>>>>
>>>>>          2412       // Agent_OnAttach executed so completion status is
>>>>> JNI_OK
>>>>>          2413       st->print_cr("return code: %d", result);
>>>>>
>>>>>          Thanks,
>>>>>          David
>>>>>
>>>>>              I cannot access JPRT.
>>>>>              So I need a sponsor.
>>>>>
>>>>>
>>>>>              Thanks,
>>>>>
>>>>>              Yasumasa
>>>>>
>