Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/liveRange.hpp @ 10374:87c64c0438fb
6976350: G1: deal with fragmentation while copying objects during GC
Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency.
Reviewed-by: johnc, jmasa, brutisso
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Mon, 03 Jun 2013 14:37:13 -0700 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP | |
| 27 | |
| 28 #include "memory/memRegion.hpp" | |
| 29 #include "utilities/copy.hpp" | |
| 30 | |
| 0 | 31 // This is a shared helper class used during phase 3 and 4 to move all the objects |
| 32 // Dead regions in a Space are linked together to keep track of the live regions | |
| 33 // so that the live data can be traversed quickly without having to look at each | |
| 34 // object. | |
| 35 | |
| 36 class LiveRange: public MemRegion { | |
| 37 public: | |
| 38 LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {} | |
| 39 | |
| 40 void set_end(HeapWord* e) { | |
| 41 assert(e >= start(), "should be a non-zero range"); | |
| 42 MemRegion::set_end(e); | |
| 43 } | |
| 44 void set_word_size(size_t ws) { | |
| 45 assert(ws >= 0, "should be a non-zero range"); | |
| 46 MemRegion::set_word_size(ws); | |
| 47 } | |
| 48 | |
| 49 LiveRange * next() { return (LiveRange *) end(); } | |
| 50 | |
| 51 void move_to(HeapWord* destination) { | |
| 52 Copy::aligned_conjoint_words(start(), destination, word_size()); | |
| 53 } | |
| 54 }; | |
| 1972 | 55 |
| 56 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP |