Issue or pull request number:
ibmruntimes/openj9-openjdk-jdk11#1000

Overview:
a new NIO channels selector provider, which is based on pollset system facility, is implemented on AIX. It provides significant performance benefits for the general situation where there are steady number of sockets to be managed, read, or written. For the time being, it is run-time optionally available or programmable through setting -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.PollsetSelectorProvider on the command line.

Release target:
0.57

Applies to the following JDK versions:
JDK11 only

Applies to the following platforms:
AIX only