RFR: 8140582: aarch64: jvm fails to initialise after 8078556

[Vladimir Kozlov]

Seems good.

Thanks,
Vladimir

On 10/27/15 6:21 PM, Edward Nevill wrote:
> Hi,
>
> Please review the following webrev
>
> http://cr.openjdk.java.net/~enevill/8140582/webrev/
>
> JIRA Issue: https://bugs.openjdk.java.net/browse/JDK-8140582
>
> The vm fails to initialises with the following error on aarch64 systems with 64K pagesize
>
> ed at arm64:~/jdk9-dev/hs-comp/hotspot$ /home/ed/images/jdk/bin/java
> intx StackYellowPages=1 is outside the allowed range [ 2 ... 7 ]
> intx StackShadowPages=1 is outside the allowed range [ 4 ... 34 ]
> Error: Could not create the Java Virtual Machine.
> Error: A fatal exception has occurred. Program will exit.
>
> The problem is the following code in src/os/linux/vm/os_linux.cpp
>
>    // If the pagesize of the VM is greater than 8K determine the appropriate
>    // number of initial guard pages.  The user can change this with the
>    // command line arguments, if needed.
>    if (vm_page_size() > (int)Linux::vm_default_page_size()) {
>      StackYellowPages = 1;
>      StackRedPages = 1;
>      StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size();
>    }
>
> My proposed fix is to set MIN_STACK_YELLOW_PAGES, MIN_STACK_RED_PAGES, and MIN_STACK_SHADOW_PAGES to 1 in globals_aarch64.hpp
>
> Thanks for the review,
> Ed.
>
>