jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionBounds.hpp@c2844108a708

     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

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     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

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    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

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    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP

    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;

    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;

    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;

    46 public:

    47   static inline size_t min_size();

    48   static inline size_t max_size();

    49   static inline size_t target_number();

    50 };

    52 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONBOUNDS_HPP

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