/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.vm;
import org.vmmagic.pragma.Uninterruptible;
@Uninterruptible public abstract class Statistics {
/**
* Returns the number of collections that have occurred.
*
* @return The number of collections that have occurred.
*/
public abstract int getCollectionCount();
/**
* Read cycle counter
*/
public abstract long nanoTime();
/**
* Convert nanoseconds to milliseconds
*/
public abstract double nanosToMillis(long c);
/**
* Convert nanoseconds to seconds
*/
public abstract double nanosToSecs(long c);
/**
* Convert milliseconds to nanoseconds
*/
public abstract long millisToNanos(double t);
/**
* Convert seconds to nanoseconds
*/
public abstract long secsToNanos(double t);
/**
* Read the cycle counter
*/
public abstract long cycles();
/**
* Initialize performance counters
*
* @param metric An integer identifying the metric being read
*/
public abstract void perfCtrInit(int metric);
/**
* Read the current cycle count from the perfctr libraries
*
* @return the current cycle count from the perfctr libraries
*/
public abstract long perfCtrReadCycles();
/**
* Read the current event count for the metric being measured by the
* perfctr libraries
*
* @return the current event count for the metric being measured by the
* perfctr libraries
*/
public abstract long perfCtrReadMetric();
}