/*
* 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.policy.immix;
import static org.mmtk.policy.Space.BYTES_IN_CHUNK;
import static org.mmtk.policy.Space.LOG_BYTES_IN_CHUNK;
import static org.mmtk.utility.Constants.LOG_BYTES_IN_PAGE;
import org.mmtk.plan.Plan;
import org.mmtk.vm.VM;
import org.vmmagic.unboxed.Word;
public class ImmixConstants {
public static final boolean BUILD_FOR_STICKYIMMIX = Plan.NEEDS_LOG_BIT_IN_HEADER;
/* start temporary experimental constants --- should not be allowed to lurk longer than necessary */
public static final int TMP_MIN_SPILL_THRESHOLD = 2;
public static final boolean TMP_PREFER_COPY_ON_NURSERY_GC = true;
/* end temporary experimental constants */
static final byte MAX_LINE_MARK_STATE = 127;
static final byte RESET_LINE_MARK_STATE = 1;
public static final boolean MARK_LINE_AT_SCAN_TIME = true; // else do it at mark time
public static final boolean SANITY_CHECK_LINE_MARKS = false && VM.VERIFY_ASSERTIONS;
public static final float DEFAULT_LINE_REUSE_RATIO = (float) 0.99;
public static final float DEFAULT_DEFRAG_LINE_REUSE_RATIO = (float) 0.99;
public static final float DEFAULT_SIMPLE_SPILL_THRESHOLD = (float) 0.25;
public static final int DEFAULT_DEFRAG_HEADROOM = 0; // number of pages.
public static final float DEFAULT_DEFRAG_HEADROOM_FRACTION = (float) 0.020;
public static final int DEFAULT_DEFRAG_FREE_HEADROOM = 0; // number of pages. This should only deviate from zero for analytical purposes. Otherwise the defragmenter is cheating!
public static final float DEFAULT_DEFRAG_FREE_HEADROOM_FRACTION = (float) 0.0;
/* sizes etc */
static final int LOG_BYTES_IN_BLOCK = (LOG_BYTES_IN_PAGE > 15 ? LOG_BYTES_IN_PAGE : 15);
public static final int BYTES_IN_BLOCK = 1<<LOG_BYTES_IN_BLOCK;
static final int LOG_PAGES_IN_BLOCK = LOG_BYTES_IN_BLOCK - LOG_BYTES_IN_PAGE;
static final int PAGES_IN_BLOCK = 1<<LOG_PAGES_IN_BLOCK;
static final int LOG_BLOCKS_IN_CHUNK = LOG_BYTES_IN_CHUNK-LOG_BYTES_IN_BLOCK;
static final int BLOCKS_IN_CHUNK = 1<<LOG_BLOCKS_IN_CHUNK;
public static final int LOG_BYTES_IN_LINE = 8;
static final int LOG_LINES_IN_BLOCK = LOG_BYTES_IN_BLOCK - LOG_BYTES_IN_LINE;
public static final short LINES_IN_BLOCK = (short) (1<<LOG_LINES_IN_BLOCK);
static final int LOG_LINES_IN_CHUNK = LOG_BYTES_IN_CHUNK - LOG_BYTES_IN_LINE;
static final int LINES_IN_CHUNK = 1<<LOG_LINES_IN_CHUNK;
public static final int BYTES_IN_LINE = 1<<LOG_BYTES_IN_LINE;
public static final int MAX_IMMIX_OBJECT_BYTES = BYTES_IN_BLOCK>>1;
private static final int LOG_BLOCKS_IN_RECYCLE_ALLOC_CHUNK = 4; // 3 + 15 -> 19 (512KB)
private static final int LOG_BYTES_IN_RECYCLE_ALLOC_CHUNK = LOG_BLOCKS_IN_RECYCLE_ALLOC_CHUNK + LOG_BYTES_IN_BLOCK;
static final int BYTES_IN_RECYCLE_ALLOC_CHUNK = 1<<LOG_BYTES_IN_RECYCLE_ALLOC_CHUNK;
public static final short MAX_BLOCK_MARK_STATE = LINES_IN_BLOCK;
static final short MAX_CONSV_SPILL_COUNT = (short) (LINES_IN_BLOCK/2);
public static final short SPILL_HISTOGRAM_BUCKETS = (short) (MAX_CONSV_SPILL_COUNT + 1);
public static final short MARK_HISTOGRAM_BUCKETS = (short) (LINES_IN_BLOCK + 1);
static final short MAX_COLLECTORS = 16; // nothing special here---we can increase this at the cost of a few hundred bites at build time.
public static final Word RECYCLE_ALLOC_CHUNK_MASK = Word.fromIntZeroExtend(BYTES_IN_RECYCLE_ALLOC_CHUNK - 1);
protected static final Word CHUNK_MASK = Word.fromIntZeroExtend(BYTES_IN_CHUNK - 1);
public static final Word BLOCK_MASK = Word.fromIntZeroExtend(BYTES_IN_BLOCK - 1);
protected static final Word LINE_MASK = Word.fromIntZeroExtend(BYTES_IN_LINE - 1);
}