The problem is due to the java agent being launched before the compiler is initialized. This results in all startup code for the agent will be executed by the interpreter only. Code registered by the agent will be compiled since those hooks will run later as well when the compiler has been started and therefore have the possiblility to be compiled and optimized.

Talking with Tom and Vladimir it should be possible to move the java agent startup to after the compiler has been started to allow all code to be compiled.

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Your agent is executed before Compiler threads are initialized
during call to post_vm_initialized().

  // Notify JVMTI agents that VM initialization is complete - nop if no agents.
  JvmtiExport::post_vm_initialized();

  Chunk::start_chunk_pool_cleaner_task();

  // initialize compiler(s)
  CompileBroker::compilation_init();
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