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comparison src/share/vm/gc_implementation/g1/heapRegionBounds.hpp @ 20423:5248357b7113

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8057710: Refactor G1 heap region default sizes Summary: Refactored the defines to instead be static const in a HeapRegionBounds class. Reviewed-by: mgerdin, tschatzl
author sjohanss
date Tue, 09 Sep 2014 04:48:41 +0200
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20422:3153adbad1e9 20423:5248357b7113
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
27
28 class HeapRegionBounds : public AllStatic {
29 private:
30 // Minimum region size; we won't go lower than that.
31 // We might want to decrease this in the future, to deal with small
32 // heaps a bit more efficiently.
33 static const size_t MIN_REGION_SIZE = 1024 * 1024;
34
35 // Maximum region size; we don't go higher than that. There's a good
36 // reason for having an upper bound. We don't want regions to get too
37 // large, otherwise cleanup's effectiveness would decrease as there
38 // will be fewer opportunities to find totally empty regions after
39 // marking.
40 static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024;
41
42 // The automatic region size calculation will try to have around this
43 // many regions in the heap (based on the min heap size).
44 static const size_t TARGET_REGION_NUMBER = 2048;
45
46 public:
47 static inline size_t min_size();
48 static inline size_t max_size();
49 static inline size_t target_number();
50 };
51
52 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP