sjohanss@7137: /*
sjohanss@7137:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
sjohanss@7137:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
sjohanss@7137:  *
sjohanss@7137:  * This code is free software; you can redistribute it and/or modify it
sjohanss@7137:  * under the terms of the GNU General Public License version 2 only, as
sjohanss@7137:  * published by the Free Software Foundation.
sjohanss@7137:  *
sjohanss@7137:  * This code is distributed in the hope that it will be useful, but WITHOUT
sjohanss@7137:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
sjohanss@7137:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
sjohanss@7137:  * version 2 for more details (a copy is included in the LICENSE file that
sjohanss@7137:  * accompanied this code).
sjohanss@7137:  *
sjohanss@7137:  * You should have received a copy of the GNU General Public License version
sjohanss@7137:  * 2 along with this work; if not, write to the Free Software Foundation,
sjohanss@7137:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
sjohanss@7137:  *
sjohanss@7137:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
sjohanss@7137:  * or visit www.oracle.com if you need additional information or have any
sjohanss@7137:  * questions.
sjohanss@7137:  *
sjohanss@7137:  */
sjohanss@7137: 
sjohanss@7137: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
sjohanss@7137: #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP
sjohanss@7137: 
sjohanss@7137: class HeapRegionBounds : public AllStatic {
sjohanss@7137: private:
sjohanss@7137:   // Minimum region size; we won't go lower than that.
sjohanss@7137:   // We might want to decrease this in the future, to deal with small
sjohanss@7137:   // heaps a bit more efficiently.
sjohanss@7137:   static const size_t MIN_REGION_SIZE = 1024 * 1024;
sjohanss@7137: 
sjohanss@7137:   // Maximum region size; we don't go higher than that. There's a good
sjohanss@7137:   // reason for having an upper bound. We don't want regions to get too
sjohanss@7137:   // large, otherwise cleanup's effectiveness would decrease as there
sjohanss@7137:   // will be fewer opportunities to find totally empty regions after
sjohanss@7137:   // marking.
sjohanss@7137:   static const size_t MAX_REGION_SIZE = 32 * 1024 * 1024;
sjohanss@7137: 
sjohanss@7137:   // The automatic region size calculation will try to have around this
sjohanss@7137:   // many regions in the heap (based on the min heap size).
sjohanss@7137:   static const size_t TARGET_REGION_NUMBER = 2048;
sjohanss@7137: 
sjohanss@7137: public:
sjohanss@7137:   static inline size_t min_size();
sjohanss@7137:   static inline size_t max_size();
sjohanss@7137:   static inline size_t target_number();
sjohanss@7137: };
sjohanss@7137: 
sjohanss@7137: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP