jmx-dev RFR: JDK-8030957 - AIX: Implement OperatingSystemMXBean.getSystemCpuLoad() and .getProcessCpuLoad() on AIX [v5]

[Suchismith Roy]

> JBS Issue : [JDK-8030957](https://bugs.openjdk.org/browse/JDK-8030957)
> 
> These two methods should be implemented in src/aix/native/sun/management/AixOperatingSystem.c (which has to be created).
> 
> getProcessCpuLoad() can be probably implemented in the same way like on Solaris be reading /proc/self/psinfo
> 
> For getSystemCpuLoad() we'll probalby have to use 'perfstat_cpu_total()' from libperf (see http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.prftools/doc/prftools/prftools07.htm#wq407)
> 
> Once this issue has been resolved you should not forget to remove the two excludes from jdk/test/ProblemList.txt:
> 
> com/sun/management/OperatingSystemMXBean/GetProcessCpuLoad.java aix-all
> com/sun/management/OperatingSystemMXBean/GetSystemCpuLoad.java aix-all

Suchismith Roy has updated the pull request incrementally with two additional commits since the last revision:

 - Thread safety,struct and perfInit()
 - Thread safety,struct and perfInit()

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25332/files
  - new: https://git.openjdk.org/jdk/pull/25332/files/e4c076f7..e064140b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25332&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25332&range=03-04

  Stats: 121 lines in 1 file changed: 62 ins; 40 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/25332.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25332/head:pull/25332

PR: https://git.openjdk.org/jdk/pull/25332