RFR (XS): 8078399: Deprecate -Xoss, -Xsqnopause, -Xoptimize and -Xboundthreads options in JDK 9 (original) (raw)

Dmitry Dmitriev dmitry.dmitriev at oracle.com
Tue Jun 23 10:35:43 UTC 2015

Hello,

Please review this small fix which deprecate -Xoss, -Xsqnopause, -Xoptimize and -Xboundthreads options in JDK 9. Also, I need a sponsor for this fix, who can push it.

Currently HotSpot silently ignore these 4 options. Here are description of these options: "-Xoss", "-Xsqnopause", "-Xoptimize" - EVM option leaved for compatibility. From Java 2 SDK for Solaris Developer's Guide: "Prior to version 1.3.0, the production releases of the Java 2 SDK for the Solaris Operating Environment shipped with a virtual-machine implementation known as the Exact VM (EVM). Beginning with version 1.3.0, the Exact VM is replaced by the Java HotSpot VM.". So, from Java 1.4 EVM is not used as VM for JDK on Solaris and these very old flags just silently ignored by HotSpot. "-Xboundthreads" - was used to bind user level threads to kernel threads on Solaris in case when new thread library is not available. But old T1 libthread has been removed from Solaris in release 10. JDK9 requires Solaris 10u9 or higher. So, this flag become useless.

All these options are deprecated, i.e. following warning is printed when option is specified: "Java HotSpot(TM) 64-Bit Server VM warning: Option -Xoss was deprecated in version 9.0 and will likely be removed in a future release.". In next major release all these options can be removed.

Webrev: http://cr.openjdk.java.net/~ddmitriev/8078399/webrev.00/ <http://cr.openjdk.java.net/%7Eddmitriev/8078399/webrev.00/> JBS: https://bugs.openjdk.java.net/browse/JDK-8078399 Tested: JPRT

Thanks, Dmitry

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