RFR(S/M) : 8243430 : use reproducible random in :vmTestbase_vm_gc

[Igor Ignatyev]

> On May 3, 2020, at 12:13 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On Apr 30, 2020, at 4:38 PM, Igor Ignatyev <igor.ignatyev at oracle.com> wrote:
>> 
>> http://cr.openjdk.java.net/~iignatyev/8243430/webrev.00
>>> 555 lines changed: 11 ins; 65 del; 479 mod;
>> 
>> Hi all,
>> 
>> could you please review this small patch?
>> from JBS: 
>>> this subtask is to use j.t.l.Utils.getRandomInstance() as a random number generator, where applicable, in : vmTestbase_vm_gc test group and marking the tests which make use of "randomness" with a proper k/w.
>> 
>> testing: : vmTestbase_vm_gc test group
>> JBS: https://bugs.openjdk.java.net/browse/JDK-8243430
>> webrevs:
>> - code changes: http://cr.openjdk.java.net/~iignatyev//8243430/webrev.00.code
>>> 94 lines changed: 11 ins; 65 del; 18 mod;
>> - adding k/w: http://cr.openjdk.java.net/~iignatyev//8243430/webrev.00.kw
>>> 229 lines changed: 0 ins; 0 del; 229 mod; 
>> - full: http://cr.openjdk.java.net/~iignatyev//8243430/webrev.00
>>> 555 lines changed: 11 ins; 65 del; 479 mod;
>> 
>> Thanks,
>> -- Igor
> 
Hi Kim,

> I could be missing something, bug I don't see where either of these
> use randomness:
> test/hotspot/jtreg/vmTestbase/gc/gctests/gctest03/gctest03.java
gctest03 starts Yellowthread at L#130, and Yellowthread uses nsk.share.test.LocalRandom in its 'run' method at L#167 of vmTestbase/gc/gctests/gctest03/appthread.java

> test/hotspot/jtreg/vmTestbase/gc/gctests/gctest04/gctest04.java
gctest04 starts reqdisp thread at L#97, and reqdisp uses n.s.t.LocalRandom in its 'run' method at L#211 of vmTestbase/gc/gctests/gctest04/reqgen.java
> 
> test/hotspot/jtreg/vmTestbase/gc/gctests/gctest02/gctest02.java
> Still importing java.util.Random, but that doesn't seem needed.
>  53 import java.util.Random;
you're right, I'll remove it before pushing.

> 
> Other than that, looks good.
thanks for review!
> 
> I don't need a new webrev for changes related to the above.

-- Igor
>