RFR: 8087200: Code heap does not use large pages

[Stefan Karlsson]

Hi Erik,

On 2015-06-12 17:15, Erik Helin wrote:
> Hi all,
>
> this patch fixes an issue with the page sizing in in the code heap
> in 8u60 that was introduced in the backport for JDK-8049864. The issue does
> not exist in JDK 9 because the code heap in JDK 9 has been rewritten and
> uses the VirtualSpace to decide the page size for the reserved size
> (there is still an issue with the alignment of the comittted size in JDK
> 9, see JDK-8087339 [0]).
>
> The fix for 8u60 consists of using the reserved size to determine the
> page size (and not require that the page size divides the reserved
> size, because the reserved size will be aligned to the page size later
> anyway).
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8087200/webrev.00/

Looks good.

StefanK

>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8087200
>
> Testing:
> - JPRT
> - Ad-hoc:
>    - Bigapps:
>      - Kitchensink
>      - runThese
>      - Weblogic
>    - JTReg:
>      - JDK
>      - SVC
>    - NSK
> - Confirmed that the perf regression introduced with the backport of [0]
>    went away.
>
> Thanks,
> Erik
>
> [0]: https://bugs.openjdk.java.net/browse/JDK-8087339