RFR(XS): 8203305: PPC64: Improve TM detection for enabling RTM on Linux / POWER9

[Gustavo Romero]

Hi Martin,

On 05/17/2018 09:25 AM, Doerr, Martin wrote:
> Hi Gustavo,
> 
> thanks for the contribution. Reviewed and pushed.

Thanks a lot for reviewing and pushing it.


Best regards,
Gustavo

> Best regards,
> Martin
> 
> 
> -----Original Message-----
> From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On Behalf Of Gustavo Romero
> Sent: Mittwoch, 16. Mai 2018 18:02
> To: hotspot-dev at openjdk.java.net; ppc-aix-port-dev at openjdk.java.net
> Subject: RFR(XS): 8203305: PPC64: Improve TM detection for enabling RTM on Linux / POWER9
> 
> Hi,
> 
> Could the following small change be reviewed please?
> 
> It improves the TM detection for enabling (or not) RTM on Linux.
> 
> With that change JVM uses TM capability flags advertised by the kernel
> instead of parsing major/minor kernel version.
> 
> That way is better to address TM on POWER9 which now supports a new TM mode
> called "TM with no Suspend Mode" and that is not mature yet (so I'm
> disabling it for now).
> 
> The new mode is just available on POWER9 DD2.1 NV (baremetal) and so TM on
> POWER9 VMs behave as on POWER8 hence RTM is enabled on POWER9 VM only.
> 
> Nothing changes regarding AIX.
> 
> bug:    https://bugs.openjdk.java.net/browse/JDK-8203305
> webrev: http://cr.openjdk.java.net/~gromero/POWER9/8203305/v1
> 
> Thank you.
> 
> 
> Best regards,
> Gustavo
>