The code heap containing non-method code is used for JVM internal code and consists of a 3 MB fixed memory block. The rest of the code cache memory is equally allocated for the profiled code and non-profiled code segments. You have control of this via command line commands.

The following command can be used to define the code heap size for the non-method compiled code:

-XX:NonMethodCodeHeapSize

The following command can be used to define the code heap size for the profiled compiled methods:

-XX:ProfiledCodeHeapSize

The following command can be used to define the code heap size for the non-profiled compiled methods:

-XX:NonProfiledCodeHeapSize

This feature certainly stands to improve Java application efficiency. It also impacts other processes that employ the code cache.