org.jikesrvm.adaptive.controller

Class RecompilationChoice

java.lang.Object

org.jikesrvm.adaptive.controller.RecompilationChoice

Direct Known Subclasses:

RecompileOptChoice

abstract class RecompilationChoice
extends Object

A recompilation choice represents an action (or a set of actions) that can be considered by the controller's analytic model.

Constructor Summary

Constructors

Constructor and Description
RecompilationChoice()

Method Summary

Modifier and Type	Method and Description
(package private) abstract double	getCost(NormalMethod meth) What is the cost of selecting this recompilation choice?
(package private) abstract double	getFutureExecutionTime(int prevCompiler, double futureExecutionTime) What is the benefit of executing this recompilation choice, given the estimated future time for the method if nothing changes?
(package private) abstract ControllerPlan	makeControllerPlan(CompiledMethod cmpMethod, int prevCompiler, double prevTimeFormethod, double bestActionTime, double bestCost) Return a controller plan that will start this recompilation choice in action.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RecompilationChoice

RecompilationChoice()

Method Detail

getCost

abstract double getCost(NormalMethod meth)

What is the cost of selecting this recompilation choice?

Parameters:

meth - The method being considered for recompilation.

Returns:

The expected cost of executing this recompilation choice

getFutureExecutionTime

abstract double getFutureExecutionTime(int prevCompiler,
                                       double futureExecutionTime)

What is the benefit of executing this recompilation choice, given the estimated future time for the method if nothing changes?

Parameters:

prevCompiler - The previous compiler

futureExecutionTime - The expected future execution time of the method if left running with the previous compiler.

Returns:

The expected future execution time if this choice were selected

makeControllerPlan

abstract ControllerPlan makeControllerPlan(CompiledMethod cmpMethod,
                                           int prevCompiler,
                                           double prevTimeFormethod,
                                           double bestActionTime,
                                           double bestCost)

Return a controller plan that will start this recompilation choice in action.

Parameters:

cmpMethod - The method in question

prevCompiler - The previous compiler

prevTimeFormethod - The estimated future time had nothing been done

bestActionTime - The estimated total time implementing this choice

bestCost - The estimated compilation cost implementing this choice

Returns:

The controller plan implementing this recompilation choice