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
  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 ZPageCacheFlushClosure : public StackObj {
  33 protected:
  34   const size_t _requested;
  35   size_t       _flushed;
  36 
  37 public:
  38   ZPageCacheFlushClosure(size_t requested);
  39   size_t overflushed() const;
  40   virtual bool do_page(const ZPage* page) = 0;
  41 };
  42 
  43 class ZPageCache {
  44 private:
  45   size_t                  _available;
  46   ZPerNUMA<ZList<ZPage> > _small;
  47   ZList<ZPage>            _medium;
  48   ZList<ZPage>            _large;
  49 
  50   ZPage* alloc_small_page();
  51   ZPage* alloc_medium_page();
  52   ZPage* alloc_large_page(size_t size);
  53 
  54   ZPage* alloc_oversized_medium_page(size_t size);
  55   ZPage* alloc_oversized_large_page(size_t size);
  56   ZPage* alloc_oversized_page(size_t size);
  57 
  58   void free_page_inner(ZPage* page);
  59 
  60   bool flush_list_inner(ZPageCacheFlushClosure* cl, ZList<ZPage>* from, ZList<ZPage>* to);
  61   void flush_list(ZPageCacheFlushClosure* cl, ZList<ZPage>* from, ZList<ZPage>* to);
  62   void flush_per_numa_lists(ZPageCacheFlushClosure* cl, ZPerNUMA<ZList<ZPage> >* from, ZList<ZPage>* to);
  63 
  64 public:
  65   ZPageCache();
  66 
  67   size_t available() const;
  68 
  69   ZPage* alloc_page(uint8_t type, size_t size);
  70   void free_page(ZPage* page);
  71 
  72   void flush(ZPageCacheFlushClosure* cl, ZList<ZPage>* to);
  73 
  74   void pages_do(ZPageClosure* cl) const;
  75 };
  76 
  77 #endif // SHARE_GC_Z_ZPAGECACHE_HPP