org.jikesrvm.adaptive.controller
Class RecompilationStrategy

java.lang.Object
  org.jikesrvm.adaptive.controller.RecompilationStrategy

Direct Known Subclasses:

AnalyticModel

public abstract class RecompilationStrategy
extends Object

An abstract class providing the interface to the decision making component of the controller.

_optPlans

private OptimizationPlanElement[][] _optPlans

_options

private OptOptions[] _options

RecompilationStrategy

public RecompilationStrategy()

considerHotMethod

ControllerPlan considerHotMethod(CompiledMethod cmpMethod,
                                 HotMethodEvent hme)

A hot method has been passed to the controller by an organizer

considerHotCallEdge

void considerHotCallEdge(CompiledMethod cmpMethod,
                         AINewHotEdgeEvent event)

A hot call edge has been passed to the controller by an organizer

init

void init()

Initialize the recompilation strategy.

Note: This uses the command line options to set up the optimization plans, so this must be run after the command line options are available.

createControllerPlan

ControllerPlan createControllerPlan(RVMMethod method,
                                    int optLevel,
                                    InstrumentationPlan instPlan,
                                    int prevCMID,
                                    double expectedSpeedup,
                                    double expectedCompilationTime,
                                    double priority)

This helper method creates a ControllerPlan, which contains a CompilationPlan, for the passed method using the passed optimization level and instrumentation plan.

Parameters:

method - the RVMMethod for the plan

optLevel - the optimization level to use in the plan

instPlan - the instrumentation plan to use

prevCMID - the previous compiled method ID

expectedSpeedup - expected speedup from this recompilation

priority - a measure of the oveall benefit we expect to see by executing this plan.

Returns:

the compilation plan to be used

createCompilationPlan

public CompilationPlan createCompilationPlan(NormalMethod method,
                                             int optLevel,
                                             InstrumentationPlan instPlan)

Construct a compilation plan that will compile the given method with instrumentation.

Parameters:

method - The method to be compiled with instrumentation

optLevel - The opt-level to recompile at

instPlan - The instrumentation plan

considerForRecompilation

boolean considerForRecompilation(HotMethodEvent hme,
                                 ControllerPlan plan)

Should we consider the hme for recompilation?

Parameters:

hme - the HotMethodEvent

plan - the ControllerPlan for the compiled method (may be null)

Returns:

true/false value

transferSamplesToNewPlan

private void transferSamplesToNewPlan(HotMethodEvent hme)

previousRecompilationAttempted

boolean previousRecompilationAttempted(RVMMethod method)

This method returns true if we've already tried to recompile the passed method. It does not guarantee that the compilation was successful.

Parameters:

method - the method of interest

Returns:

whether we've tried to recompile this method

getPreviousCompiler

int getPreviousCompiler(CompiledMethod cmpMethod)

This method retrieves the previous compiler constant.

getMaxOptLevel

int getMaxOptLevel()

What is the maximum opt level that is vallid according to this strategy?

createOptimizationPlans

void createOptimizationPlans()

Create the default set of pairs Process optimizing compiler command line options.

processCommandLineOptions

public static void processCommandLineOptions(OptOptions options,
                                             int optLevel,
                                             int maxOptLevel,
                                             String[] optCompilerOptions)

Process the command line arguments and pass the appropriate ones to the Options Called by sampling and counters recompilation strategy.

Parameters:

options - The options being constructed

optLevel - The level of the options being constructed

maxOptLevel - The maximum valid opt level

optCompilerOptions - The list of command line options