[10u] RFA: JDK-8203305 and JDK-8203669 (RTM fixes for POWER9)

[Rob McKenna]

Hi Gustavo,

As per rules 1 & 2, please add a fix request comment to each bug along
with the jdk10u-fix-request label.

(note, this is the new process - approval mails are no longer necessary)

    -Rob

On 04/06/18 17:05, Gustavo Romero wrote:
> Hi,
> 
> Some distro releases, notably Ubuntu 18.04 LTS "Bionic Beaver", are already
> shipping OpenJDK 10. Ubuntu 18.04 is able to run on the new POWER9
> machines. On some of these new POWER9 machines the JVM won't be able to
> detect a new POWER9 TM mode (called "TM with No Suspend mode") and will
> halt on checking if the JVM is capable of enabling the RTM feature (which
> depends upon TM).
> 
> So I would like to request the approval to backport the following two
> changes to 10u that address this issue on POWER9 DD2.1:
> 
> Title        : RFR(XS): 8203305: PPC64: Improve TM detection for enabling RTM on Linux / POWER9 [1]
> Bug          : https://bugs.openjdk.java.net/browse/JDK-8203305
> Review thread: http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-May/032313.html
> Patch        : http://hg.openjdk.java.net/jdk/jdk/raw-rev/e2d9b38630c3
> 
> Title        : RFR(S) : 8203669: PPC64: Fix jtreg RTM tests after "8203305: Improve TM detection for enabling RTM on Linux / POWER9" [2]
> Bug          : https://bugs.openjdk.java.net/browse/JDK-8203669
> Review thread: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2018-May/029091.html
> Patch        : http://hg.openjdk.java.net/jdk/jdk/raw-rev/ede65c4fb6da
> 
> Both changes apply cleanly to 10u except for small offsets.
> 
> Change [1] is PPC-only. Change [2] touches shared code but it just changes
> a jtreg test in regard to PPC and fixes a few typos. Although changes [1]
> and [2] are marked as "Enhancement" in the JBS, I understand that they
> actually fit the "CPU fix merges" as found on Rule 3, in the Request
> for Approval rules [3].
> 
> Thank you.
> 
> 
> Best regards,
> Gustavo
> 
> [3] http://openjdk.java.net/projects/jdk-updates/approval.html
>