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

[mikhailo.seledtsov at oracle.com]

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
>