1 /*
   2  * Copyright (c) 2016, 2017, 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 #ifndef SHARE_GC_Z_ZMARKCACHE_HPP
  25 #define SHARE_GC_Z_ZMARKCACHE_HPP
  26 
  27 #include "gc/z/zGlobals.hpp"
  28 #include "memory/allocation.hpp"
  29 
  30 class ZPage;
  31 
  32 class ZMarkCacheEntry {
  33 private:
  34   ZPage*   _page;
  35   uint32_t _objects;
  36   size_t   _bytes;
  37 
  38 public:
  39   ZMarkCacheEntry();
  40 
  41   void inc_live(ZPage* page, size_t bytes);
  42   void evict();
  43 };
  44 
  45 class ZMarkCache : public StackObj {
  46 private:
  47   const size_t    _shift;
  48   ZMarkCacheEntry _cache[ZMarkCacheSize];
  49 
  50 public:
  51   ZMarkCache(size_t nstripes);
  52   ~ZMarkCache();
  53 
  54   void inc_live(ZPage* page, size_t bytes);
  55 };
  56 
  57 #endif // SHARE_GC_Z_ZMARKCACHE_HPP