> The extra step of recompiling code at Tier 3 is necessary since the overhead of full profiling is too high to be used for all methods, especially for a module

> The extra step of recompiling code at Tier 3 is necessary since the overhead of full profiling is too high to be used for all methods, especially for a module such as java.base. For user applications it might make sense to allow AOT compilations with Tier 3-equivalent profiling, but this will not be supported for JDK 9. This implies it will be in Java 9 (in a limited fashion).