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_ZPAGEALLOCATOR_HPP
  25 #define SHARE_GC_Z_ZPAGEALLOCATOR_HPP
  26 
  27 #include "gc/z/zAllocationFlags.hpp"
  28 #include "gc/z/zList.hpp"
  29 #include "gc/z/zLock.hpp"
  30 #include "gc/z/zPageCache.hpp"
  31 #include "gc/z/zPhysicalMemory.hpp"
  32 #include "gc/z/zPreMappedMemory.hpp"
  33 #include "gc/z/zVirtualMemory.hpp"
  34 #include "memory/allocation.hpp"
  35 
  36 class ZPageAllocRequest;
  37 
  38 class ZPageAllocator VALUE_OBJ_CLASS_SPEC {
  39 private:
  40   ZLock                    _lock;
  41   ZVirtualMemoryManager    _virtual;
  42   ZPhysicalMemoryManager   _physical;
  43   ZPageCache               _cache;
  44   ZPreMappedMemory         _pre_mapped;
  45   const size_t             _max_reserve;
  46   size_t                   _used_high;
  47   size_t                   _used_low;
  48   size_t                   _used;
  49   size_t                   _allocated;
  50   ssize_t                  _reclaimed;
  51   ZList<ZPageAllocRequest> _queue;
  52   ZList<ZPage>             _detached;
  53 
  54   static ZPage* const      gc_marker;
  55 
  56   void increase_used(size_t size, bool relocation);
  57   void decrease_used(size_t size, bool reclaimed);
  58 
  59   size_t available(ZAllocationFlags flags) const;
  60 
  61   ZPage* create_page(uint8_t type, size_t size);
  62   void map_page(ZPage* page);
  63   void detach_page(ZPage* page);
  64   void flush_pre_mapped();
  65   void flush_cache(size_t size);
  66 
  67   void check_out_of_memory_during_initialization();
  68 
  69   ZPage* alloc_page_common_inner(uint8_t type, size_t size, ZAllocationFlags flags);
  70   ZPage* alloc_page_common(uint8_t type, size_t size, ZAllocationFlags flags);
  71   ZPage* alloc_page_blocking(uint8_t type, size_t size, ZAllocationFlags flags);
  72   ZPage* alloc_page_nonblocking(uint8_t type, size_t size, ZAllocationFlags flags);
  73 
  74   void satisfy_alloc_queue();
  75 
  76   void detach_memory(const ZVirtualMemory& vmem, ZPhysicalMemory& pmem);
  77 
  78 public:
  79   ZPageAllocator(size_t min_capacity, size_t max_capacity, size_t max_reserve);
  80 
  81   bool is_initialized() const;
  82 
  83   size_t max_capacity() const;
  84   size_t capacity() const;
  85   size_t max_reserve() const;
  86   size_t used_high() const;
  87   size_t used_low() const;
  88   size_t used() const;
  89   size_t allocated() const;
  90   size_t reclaimed() const;
  91 
  92   void reset_statistics();
  93 
  94   ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
  95   void flip_page(ZPage* page);
  96   void free_page(ZPage* page, bool reclaimed);
  97   void destroy_page(ZPage* page);
  98 
  99   void flush_detached_pages(ZList<ZPage>* list);
 100 
 101   void flip_pre_mapped();
 102 
 103   void check_out_of_memory();
 104 };
 105 
 106 #endif // SHARE_GC_Z_ZPAGEALLOCATOR_HPP