RFR: 8241354: ZGC: fatal error: Failed to get NUMA id due to get_mempolicy operation not permitted

[Erik Österlund]

Hi Jie,

It seems to me that if the environment doesn’t supply the required NUMA APIs, then we really should disable UseNUMA instead. I propose we check the availability of the syscall during initialization instead, and switch off all NUMA functionality when appropriate. And we should only print a warning if the user explicitly supplied UseNUMA on the command line.

Thanks,
/Erik

> On 20 Mar 2020, at 13:15, jiefu(傅杰) <jiefu at tencent.com> wrote:
> 
> Hi all,
> 
> JBS:    https://bugs.openjdk.java.net/browse/JDK-8241354
> Webrev: http://cr.openjdk.java.net/~jiefu/8241354/webrev.00/
> 
> A VM fatal error may be observed if ZGC is used.
> 
> The background is that some of our products will run in the docker.
> For some safety reason, SYS_get_mempolicy is not allowed in the docker.
> 
> It might be not a good practice to generate a fatal error when get_mempolicy fails.
> What do you think?
> 
> Thanks a lot.
> Best regards,
> Jie