RFR(XS): [TESTBUG] Fix runtime/StackGuardPages/testme.sh to deal with 64k pages.

[Lindenmaier, Goetz]

Hi David, 

that's just because of the stack size computation in os_linux.cpp.
It uses Linux::page_size, which is 64K, and Linux::vm_default_page_size(), which is 8K.
Red/Yellow/Shadow pages are all set to 1.

I already fixed a lot of jtreg tests wrt. the initial stack size.

Best regards,
  Goetz.

oJ/8077838-ppc-hs-comp> output-jdk9-fastdebug/images/jdk/bin/java -Xss320K
The stack size specified is too small, Specify at least 328k
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

-----Original Message-----
From: David Holmes [mailto:david.holmes at oracle.com] 
Sent: Montag, 27. April 2015 02:38
To: Lindenmaier, Goetz; hotspot-dev at openjdk.java.net
Subject: Re: RFR(XS): [TESTBUG] Fix runtime/StackGuardPages/testme.sh to deal with 64k pages.

Hi Goetz,

On 24/04/2015 7:08 PM, Lindenmaier, Goetz wrote:
> Hi,
>
> runtime/StackGuardPages/testme.sh fails on OSes with default 64K pages.
> This happens on ppc linux distributions. The test passes -Xss320k to the VM.
>
> Fix: increase to -Xss328K.

Why does the test fail? I would have expected a stack size that is a 
multiple of possible page sizes (up to 64K) to be okay.

Thanks,
David

> Please review this change of a single character ;) I please need a sponsor.
> http://cr.openjdk.java.net/~goetz/webrevs/8078595-64Kpages/webrev.01/
>
> Best regards,
>    Goetz.
>