1 /*
   2  * Copyright (c) 2015, 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_ZPAGECACHE_HPP
  25 #define SHARE_GC_Z_ZPAGECACHE_HPP
  26 
  27 #include "gc/z/zList.hpp"
  28 #include "gc/z/zPage.hpp"
  29 #include "gc/z/zValue.hpp"
  30 #include "memory/allocation.hpp"
  31 
  32 class ZPageCache {
  33 private:
  34   size_t                  _available;
  35 
  36   ZPerNUMA<ZList<ZPage> > _small;
  37   ZList<ZPage>            _medium;
  38   ZList<ZPage>            _large;
  39 
  40   ZPage* alloc_small_page();
  41   ZPage* alloc_medium_page();
  42   ZPage* alloc_large_page(size_t size);
  43 
  44   void flush_list(ZList<ZPage>* from, size_t requested, ZList<ZPage>* to, size_t* flushed);
  45   void flush_per_numa_lists(ZPerNUMA<ZList<ZPage> >* from, size_t requested, ZList<ZPage>* to, size_t* flushed);
  46 
  47 public:
  48   ZPageCache();
  49 
  50   size_t available() const;
  51 
  52   ZPage* alloc_page(uint8_t type, size_t size);
  53   void free_page(ZPage* page);
  54 
  55   void flush(ZList<ZPage>* to, size_t requested);
  56 };
  57 
  58 #endif // SHARE_GC_Z_ZPAGECACHE_HPP