| /* |
| * This file is part of the Jikes RVM project (http://jikesrvm.org). |
| * |
| * This file is licensed to You under the Eclipse Public License (EPL); |
| * 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/eclipse-1.0.php |
| * |
| * See the COPYRIGHT.txt file distributed with this work for information |
| * regarding copyright ownership. |
| */ |
| package org.mmtk.utility.statistics; |
| |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements a simple performance counter, used to gather |
| * data from hardware performance counters. |
| */ |
| @Uninterruptible |
| public class PerfCounter extends LongCounter { |
| |
| /**************************************************************************** |
| * |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| * |
| * @param name The name to be associated with this counter |
| */ |
| public PerfCounter(String name) { |
| this(name, true, false); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param name The name to be associated with this counter |
| * @param start True if this counter is to be implicitly started at |
| * boot time (otherwise the counter must be explicitly started). |
| */ |
| public PerfCounter(String name, boolean start) { |
| this(name, start, false); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param name The name to be associated with this counter |
| * @param start True if this counter is to be implicitly started at |
| * boot time (otherwise the counter must be explicitly started). |
| * @param gconly True if this counter only pertains to (and |
| * therefore functions during) GC phases. |
| */ |
| public PerfCounter(String name, boolean start, boolean gconly) { |
| super(name, start, gconly); |
| } |
| |
| /**************************************************************************** |
| * |
| * Counter-specific methods |
| */ |
| |
| /** |
| * Get the current value for this counter |
| * |
| * @return The current value for this counter |
| */ |
| @Inline |
| protected final long getCurrentValue() { |
| return VM.statistics.perfCtrReadMetric(); |
| } |
| } |