RFR: 8256155: Allow multiple large page sizes to be used on Linux [v36]

[Marcus G K Williams]

On Fri, 14 May 2021 09:42:42 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Hi,
> 
> we see crashes on linux ppc64 with gc/g1/TestLargePageUseForAuxMemory.java.
> 
> ```
> #
> #  Internal Error (/sapmnt/sapjvm_work/openjdk/nb/linuxppc64/jdk-dev/src/hotspot/share/utilities/globalDefinitions.cpp:370), pid=44816, tid=44821
> #  assert(div != 0) failed: lcm requires positive arguments
> #
> ```
> 
> Stack:
> 
> ```
> V  [libjvm.so+0xd22efc]  lcm(unsigned long, unsigned long)+0xdc
> V  [libjvm.so+0xcc9430]  GCArguments::compute_heap_alignment()+0x70
> V  [libjvm.so+0x490d1c]  Arguments::apply_ergo()+0x7c
> V  [libjvm.so+0x186a66c]  Threads::create_vm(JavaVMInitArgs*, bool*)+0x1ec
> ```
> 
> Note that ppc64 has 64k pages. I don't have time to investigate this right now, but maybe you can reproduce the crash by faking a 64k page size in os::vm_page_size()?

Thanks @tstuefe. Taking a look now.

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PR: https://git.openjdk.java.net/jdk/pull/1153