RFR: 8241354: ZGC still crashes in containers with NUMA due to get_mempolicy is disabled by default [v2]

[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

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Add pliden's refinement

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3704/files
  - new: https://git.openjdk.java.net/jdk/pull/3704/files/eb3ac39b..c6f431a3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3704&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3704&range=00-01

  Stats: 14 lines in 1 file changed: 2 ins; 0 del; 12 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