Many people working on the JDK don't use sjavac but instead use the "make jdk-only JDK_FILTER=<filter>" hack to only re-compile the source files that they have changed.

This issue is created to see whether it would make sense (or even be feasible) to have a "make <module> JDK_FILTER=<filter>" to avoid compile all classes in the module and the modules that depend on it.