RFR: 8266217: ZGC: Improve the -Xlog:gc+init output for NUMA

[Jie Fu]

Hi all,

This patch improves the -Xlog:gc+init output for NUMA, which is suggested by StefanK [1].
The implementation just follows how UseLargePages are setup and printed.

Before (in docker, not support get_mempolicy)

[0.007s][info][gc,init] Initializing The Z Garbage Collector
[0.007s][info][gc,init] Version: 17-internal+0-adhoc..jdk (fastdebug)
[0.007s][info][gc,init] NUMA Support: Disabled
...


After (in docker, not support get_mempolicy)

[0.007s][info][gc,init] Initializing The Z Garbage Collector
[0.007s][info][gc,init] Version: 17-internal+0-adhoc..jdk (fastdebug)
[0.007s][info][gc,init] NUMA Support: Unsupported
...


Testing:
  - tier1~3 on Linux/x64, no regression

Thanks.
Best regards,
Jie


[1] https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2020-March/028927.html

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

Commit messages:
 - 8266217: ZGC: Improve the -Xlog:gc+init output for NUMA

Changes: https://git.openjdk.java.net/jdk/pull/3778/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3778&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266217
  Stats: 37 lines in 6 files changed: 21 ins; 0 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3778.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3778/head:pull/3778

PR: https://git.openjdk.java.net/jdk/pull/3778