001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.mmtk.utility.options;
014
015public class PretenureThresholdFraction extends org.vmutil.options.FloatOption {
016
017  /**
018   * if object is bigger than this fraction of nursery, pretenure to LOS
019   */
020  private static final float DEFAULT_PRETENURE_THRESHOLD_FRACTION = 0.5f;
021
022  /**
023   * Create the option.
024   */
025  public PretenureThresholdFraction() {
026    super(Options.set, "Pretenure Threshold Fraction",
027          "Objects larger than this fraction of the remaining nursery will be allocated directly into the LOS.",
028          DEFAULT_PRETENURE_THRESHOLD_FRACTION);
029  }
030
031  /**
032   * Ensure the value is valid.
033   */
034  @Override
035  protected void validate() {
036    failIf((this.value < 0 || this.value > 1.0), "Ratio must be a float between 0 and 1");
037  }
038}