SA.NEXT - SA feedback needed

[Coleen Phillimore]

On 2/10/14 8:40 AM, Staffan Larsen wrote:
>
> On 10 feb 2014, at 14:32, Coleen Phillimore 
> <coleen.phillimore at oracle.com <mailto:coleen.phillimore at oracle.com>> 
> wrote:
>
>> On 2/10/2014 4:07 AM, Staffan Larsen wrote:
>>>>> I've said before that I believe the SA should be discontinued 
>>>>> unless the problem of duplicated hotspot code in it can be 
>>>>> resolved.   We are in the process of changing many things in the 
>>>>> code and the tax of a duplicate implementation in Java is too 
>>>>> high.  Find a way to use the libjvm.so or a libjvm_sa.so to 
>>>>> retrieve hotspot internals.
>>>>
>>>> The main problem, as I see it, is the lack of testing and 
>>>> self-verification.  If the SA would do that as part of compilation 
>>>> we wouldn’t have a broken SA every other build.
>>
>> No, it's not just that it needs to be tested automatically.   It 
>> needs to not make you write your change twice, once in the JVM and 
>> another time in Java.   The duplicated code needs to be removed.  
>> There should be exactly one copy of the symbol table code, for example.
>
> That would be ideal, yes. So far I haven’t seen a viable proposal for 
> how to implement this for core file debugging. I’m not saying that it 
> can’t be done, just that we haven’t solved the “how” yet.

I think Dmitry's email is on the right track.   If we find we have this 
duplicated code for functionality that we don't need, we can definitely 
remove it.  We should first start with the requirements. Then we can 
choose an implementation that has a better design.

Coleen

>
> /Staffan