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src/share/vm/gc/g1/heapRegionBounds.hpp

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   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
   1 /*
   2  * Copyright (c) 2014, 2015, 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_G1_HEAPREGIONBOUNDS_HPP
  26 #define SHARE_VM_GC_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_G1_HEAPREGIONBOUNDS_HPP
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