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

[Gustavo Romero]

Hi Rob,

On 06/04/2018 09:33 PM, Rob McKenna wrote:
> 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)

oh I see. Thank you. It's done. I was only unsure about how I could turn
conspicuous the fact that it's a patchset and so getting 8203305 implies
getting 8203669. I did a crossref: so on request for 8203305 I mention
8203669, and vice versa. Please, let me if it's not ok.


Best regards,
Gustavo

>      -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
>>
>