1 /*
   2  * Copyright (c) 2015, 2019, 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
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  24 
  25 #ifndef SHARE_GC_G1_G1EDENREGIONS_HPP
  26 #define SHARE_GC_G1_G1EDENREGIONS_HPP
  27 
  28 #include "gc/g1/g1RegionCounts.hpp"
  29 #include "gc/g1/heapRegion.hpp"
  30 #include "runtime/globals.hpp"
  31 #include "utilities/debug.hpp"
  32 
  33 class G1EdenRegions {
  34 private:
  35   int    _length;
  36   // Sum of used bytes from all retired eden regions.
  37   // I.e. updated when mutator regions are retired.
  38   volatile size_t _used_bytes;
  39   G1RegionCounts  _region_counts;
  40 
  41 public:
  42   G1EdenRegions() : _length(0), _used_bytes(0), _region_counts() { }
  43 
  44   virtual uint add(HeapRegion* hr) {
  45     assert(!hr->is_eden(), "should not already be set");
  46     _length++;
  47     return _region_counts.add(hr);
  48   }
  49 
  50   void clear() {
  51     _length = 0;
  52     _used_bytes = 0;
  53     _region_counts.clear();
  54   }
  55 
  56   uint length() const { return _length; }
  57   uint length(uint node_index) const { return _region_counts.length(node_index); }
  58 
  59   size_t used_bytes() const { return _used_bytes; }
  60 
  61   void add_used_bytes(size_t used_bytes) {
  62     _used_bytes += used_bytes;
  63   }
  64 };
  65 
  66 #endif // SHARE_GC_G1_G1EDENREGIONS_HPP