RFR(S/T) : 8242311 : use reproducible random in hotspot runtime tests

[Igor Ignatyev]

@Misha,
thanks for the review!

@alias,
can I get a 2nd Review?

Cheers,
-- Igor

> On Apr 8, 2020, at 11:53 AM, mikhailo.seledtsov at oracle.com wrote:
> 
> Looks good,
> 
> Misha
> 
> On 4/8/20 11:13 AM, Igor Ignatyev wrote:
>> http://cr.openjdk.java.net/~iignatyev//8242311/webrev.00
>>> 35 lines changed: 12 ins; 1 del; 22 mod;
>> 
>> Hi all,
>> 
>> could you please review the patch which updates hotspot runtime tests in the same way as 8242310[1,2] updates compiler tests:
>>> marks ... tests w/ randomness k/w and uses Utils.getRandomInstance() instead of Random w/ _random_ seeds where possible? To identify tests which should be marked, I've used both static (in a form of analyzing classes which directly or indirectly depend on Random/SecureRandom/ThreadLocalRandom) and dynamic (by instrumenting the said classes to log tests which called their 'next' methods) analyses. I've decided *not* to mark tests which use SecureRandom only via File.createTemp* b/c in all such cases temp files are not used as a source of randomness, but rather just a reliable way to get a new/empty file/dir.
>> JBS: https://bugs.openjdk.java.net/browse/JDK-8242311
>> webrev: http://cr.openjdk.java.net/~iignatyev/8242311/webrev.00
>> 
>> NB the patch depends on 8241707[3], which is currently under review[4].
>> 
>> [1] https://bugs.openjdk.java.net/browse/JDK-8242310
>> [2] https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-April/037828.html
>> [3] https://bugs.openjdk.java.net/browse/JDK-8241707
>> [4] https://mail.openjdk.java.net/pipermail/hotspot-dev/2020-April/041300.html
>> 
>> Thanks,
>> -- Igor
>>