| /* |
| * 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.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(); |
| |
| } |