org.jikesrvm.adaptive.controller
Class ControllerThread

java.lang.Object
  org.jikesrvm.scheduler.SystemThread
      org.jikesrvm.adaptive.controller.ControllerThread

public final class ControllerThread
extends SystemThread

This class implements the controller thread. This entity is the brains of the adaptive optimization system. It communicates with the runtime measurements subsystem to instruct and gather profiling information. It also talks to the compilation threads to generate

• instrumented executables;
• optimized executables;
• static information about a method; or
• all of the above.

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  Field Summary
  private  DynamicCallGraphOrganizer	dcgOrg           There are several ways in which a dcg organizer might be created; keep track of it once it is created so that we only create one instance of it.
  private  SoftLatch	sentinel

   

  Fields inherited from class org.jikesrvm.scheduler.SystemThread
  rvmThread

   

  Constructor Summary
  ControllerThread(SoftLatch sentinel)           constructor

   

  Method Summary
  void	aboutToWait()           Called when the controller thread is about to wait on Controller.controllerInputQueue
  private  void	controllerInitDone()
  private  void	createCompilationThread()           Create the compilationThread and schedule it
  private  void	createDynamicCallGraphOrganizer()           Create a dynamic call graph organizer of one doesn't already exist
  private  void	createOrganizerThreads()           Create the organizerThreads and schedule them
  private  void	createProfilers()           Create profiling entities that are independent of whether or not adaptive recompilation is actually enabled.
  void	doneWaiting()           Called when the controller thread is woken after waiting on Controller.controllerInputQueue
  boolean	earlyRestrictOptLevels()           If we're going to be gathering a dynamic call graph, then we don't want to let the opt compiler compile anything above O0 until we have some initial data in the call graph to work with.
  static void	report()           Final report
  void	run()           This method is the entry point to the controller, it is called when the controllerThread is created.

   

  Methods inherited from class org.jikesrvm.scheduler.SystemThread
  getRVMThread, start, stop

   

  Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

   

  Field Detail

  sentinel

  private final SoftLatch sentinel

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  dcgOrg

  private DynamicCallGraphOrganizer dcgOrg

  There are several ways in which a dcg organizer might be created; keep track of it once it is created so that we only create one instance of it.

  Constructor Detail

  ControllerThread

  ControllerThread(SoftLatch sentinel)

  constructor

  Parameters:

  sentinel - An object to signal when up and running

  Method Detail

  run

  public void run()

  This method is the entry point to the controller, it is called when the controllerThread is created.

  Specified by:

  run in class SystemThread

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  controllerInitDone

  private void controllerInitDone()

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  aboutToWait

  public void aboutToWait()

  Called when the controller thread is about to wait on Controller.controllerInputQueue

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  doneWaiting

  public void doneWaiting()

  Called when the controller thread is woken after waiting on Controller.controllerInputQueue

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  earlyRestrictOptLevels

  public boolean earlyRestrictOptLevels()

  If we're going to be gathering a dynamic call graph, then we don't want to let the opt compiler compile anything above O0 until we have some initial data in the call graph to work with. The goal of this restriction is to avoid making early bad decisions that we don't get a chance to revisit because methods get to maxOptLevel too quickly.

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  createCompilationThread

  private void createCompilationThread()

  Create the compilationThread and schedule it

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  createDynamicCallGraphOrganizer

  private void createDynamicCallGraphOrganizer()

  Create a dynamic call graph organizer of one doesn't already exist

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  createProfilers

  private void createProfilers()

  Create profiling entities that are independent of whether or not adaptive recompilation is actually enabled.

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  createOrganizerThreads

  private void createOrganizerThreads()

  Create the organizerThreads and schedule them

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  report

  public static void report()

  Final report

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