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
Hi Gustavo, thanks for the contribution. Reviewed and pushed. Best regards, Martin -----Original Message----- From: hotspot-dev [mailto:hotspot-dev-bounces@openjdk.java.net] On Behalf Of Gustavo Romero Sent: Mittwoch, 16. Mai 2018 18:02 To: hotspot-dev@openjdk.java.net; ppc-aix-port-dev@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
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@openjdk.java.net] On Behalf Of Gustavo Romero Sent: Mittwoch, 16. Mai 2018 18:02 To: hotspot-dev@openjdk.java.net; ppc-aix-port-dev@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
participants (2)
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Doerr, Martin
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Gustavo Romero