WIP: Added changes to display CPU Governors in Javacore

[bharathappali]

As stated in the issue #2838 CPU Governors in linux might be useful for debugging purposes and thought it would be good to have that information in javacore.

The current changes adds a J9 Port Library api j9sysinfo_get_cpu_governor_info which fetch the CPU governor information and this will be called in runtime/rasdump/javadump.cpp in writeCPUInfo function.

These lines are added after CPU Information to get the CPU Governor Details

1CICPUGINF     CPU Governor Information
NULL           ------------------------------------------------------------------------
2CICPUGPOWS    CPUS with Powersave Governor : /* list the cpus which have Powersave governor */
2CICPUGPERF    CPUS with Performance Governor : /* list the cpus which have Performance governor */
2CICPUGURSP    CPUS with User Space Governor : /* list the cpus which have User Space governor */
2CICPUGONDM    CPUS with On Demand Governor : /* list the cpus which have On Demand governor */
2CICPUGCONS    CPUS with Conservative Governor : /* list the cpus which have Conservative governor */
2CICPUGSCUT    CPUS with Sched Util Governor : /* list the cpus which have Sched Util governor */

Example

1CICPUINFO     CPU Information
NULL           ------------------------------------------------------------------------
2CIPHYSCPU     Physical CPUs: 4
2CIONLNCPU     Online CPUs: 4
2CIBOUNDCPU    Bound CPUs: 4
2CIACTIVECPU   Active CPUs: 0
2CITARGETCPU   Target CPUs: 4
NULL           
1CICPUGINF     CPU Governor Information
NULL           ------------------------------------------------------------------------
2CICPUGPOWS    CPUS with Powersave Governor : 0 1 2 3 

In the above example there are 4 cpu's and each of them are having their cpu scaling governor set to powersave

Note: This features are work in progress as the way of information representation may have changes.
Please kindly add your views on this PR or in the issue #2838

FYI - @ashu-mehra @DanHeidinga
Thanks

Doc issue eclipse-openj9/openj9-docs#136

Signed-off-by: bharathappali [email protected]

[bharathappali]

Refactoring the code. Will be updating for review after the code changes are done.

[pshipton]

Moving forward until this picks up again.

[genie-openj9]

Can one of the admins verify this patch?