RFR: 8196197 - Enable the make system to calculate concurrency for JDK tests

[Erik Joelsson]

This looks good to me.

Note to other reviewers. This change only applies when concurrency isn't 
being set by some other entity. Other entities include the top level 
makefiles (typically when running "make test TEST=<jtreg group>") or by 
setting CONCURRENCY=<foo> on the make command line. The reason for this 
change is to have the test makefiles themselves provide reasonable 
defaults, which is needed when running in our distributed internal test 
system. The neat thing about this implementation is the ability to scale 
concurrency with a relative number using the concurrency factor.

/Erik


On 2018-01-26 14:44, Christian Tornqvist wrote:
> Please review this small change that makes the JDK make test target use the same method for calculating jtreg concurrency as Hotspot. Verified locally and in Mach5.
>
> Webrev: http://cr.openjdk.java.net/~ctornqvi/webrev/8196197/webrev.00/ <http://cr.openjdk.java.net/~ctornqvi/webrev/8196197/webrev.00/>
>
> Thanks,
> Christian