[15] RFR 8238633: JVMTI heap walk should consult GC for marking oops

[Zhengyu Gu]

Hi Stefan,

Thanks for the review and suggestions, updated accordingly:

http://cr.openjdk.java.net/~zgu/JDK-8238633/webrev.01/

> 
> ---
> Previously, the calls to 'mark' and 'visited' were inlineable, but now 
> every GC has to take a virtual call when marking the objects. My guess 
> is that this code is slow anyway, and that it doesn't matter too much, 
> but did you measure the effect of that change with, for example, G1?
> 
I did rough measurement, timing 
vmTestbase/nsk/jvmti/unit/heap/HeapWalkTests/TestDescription.java test.

If you know any tests/benchmarks I should measure, please let me know.

Thanks,

-Zhengyu


> Thanks,
> StefanK
> 
>> Test:
>>    hotspot_gc
>>    vmTestbase_nsk_jdi
>>    vmTestbase_nsk_jvmti
>>
>> Thanks,
>>
>> -Zhengyu
>>
>>
>