Mercurial > hg > truffle
diff src/share/vm/gc_implementation/g1/heapRegionBounds.hpp @ 20423:5248357b7113
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 |
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date | Tue, 09 Sep 2014 04:48:41 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/heapRegionBounds.hpp Tue Sep 09 04:48:41 2014 +0200 @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP +#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP + +class HeapRegionBounds : public AllStatic { +private: + // Minimum region size; we won't go lower than that. + // We might want to decrease this in the future, to deal with small + // heaps a bit more efficiently. + static const size_t MIN_REGION_SIZE = 1024 * 1024; + + // Maximum region size; we don't go higher than that. There's a good + // reason for having an upper bound. We don't want regions to get too + // large, otherwise cleanup's effectiveness would decrease as there + // will be fewer opportunities to find totally empty regions after + // marking. + static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024; + + // The automatic region size calculation will try to have around this + // many regions in the heap (based on the min heap size). + static const size_t TARGET_REGION_NUMBER = 2048; + +public: + static inline size_t min_size(); + static inline size_t max_size(); + static inline size_t target_number(); +}; + +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP