RFR: 8241354: ZGC still crashes in containers with NUMA due to get_mempolicy is disabled by default

[Jie Fu]

Hi all,

ZGC still crashes in containers hosting on NUMA machines due to an fatal error [1], which really limits the usage of zgc.

The reason is that get_mempolicy is blocked by default in dockers [2].
With the default docker configuration, ZGC will always crash with NUMA.

Other collectors are also somehow affected by this restriction.
But unlike zgc, they won't crash and can still work in dockers.
So we'd better fix this bug as soon as possible since more and more people would like to use zgc.

The patch was prepared under the guidance of StefanK [3] and many thanks to him.
And we'd like to provide a user friendly -Xlog:gc+init log in a separate RFE after this issue.

Testing:
  - tier1 ~ tier3 on Linux/x64

Thanks.
Best regards,
Jie

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/os/linux/gc/z/zNUMA_linux.cpp#L64
[2] https://docs.docker.com/engine/security/seccomp/
[3] https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2020-March/028927.html

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Commit messages:
 - 8241354: ZGC still crashes in containers with NUMA due to get_mempolicy is disabled by default

Changes: https://git.openjdk.java.net/jdk/pull/3704/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3704&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8241354
  Stats: 17 lines in 1 file changed: 15 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3704.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3704/head:pull/3704

PR: https://git.openjdk.java.net/jdk/pull/3704