RFR (XS) 8061467: Add UseLargePages to TestNUMAPageSize

[Thomas Schatzl]

Hi,

  while testing this patch before push it seems like the problem is ZGC
which does not fall back to using small pages (which I did not know).

> [5.048s][error][gc,init] Not enough space available on the backing
filesystem to hold the current max
> [5.048s][error][gc,init] Java heap size (128M). Forcefully lowering
max Java heap size to 0M (0%).
> Error occurred during initialization of VM
> java.lang.OutOfMemoryError: Java heap too small

I will hold off pushing this before this issue has been resolved in one
way or the other.

Thanks,
  Thomas

On Mon, 2018-08-13 at 10:23 +0200, Thomas Schatzl wrote:
> Hi,
> 
> On Mon, 2018-08-13 at 09:58 +0200, Per Liden wrote:
> > Hmm, I suspect this might fail on many Linux systems, since it
> > might require configuring the huge page pool with enough pages.
> 
>   from my understanding -XX:+UseLargePages will just give some
> warnings
>  at startup if it can not allocate pages. It will not fail.
> 
> Assuming that the intent is to check whether when trying to use large
> pages (and the machine is properly configured), does not in any way
> make the VM crash, the warnings can be ignored.
> 
> I am not aware there is a way to run tests on machines only that have
> the property "properly configured large pages" at this time.
> 
> Thanks,
>   Thomas
>