src/hotspot/share/gc/z/zMarkCache.hpp

/*
 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#ifndef SHARE_GC_Z_ZMARKCACHE_HPP
#define SHARE_GC_Z_ZMARKCACHE_HPP

#include "gc/z/zGlobals.hpp"
#include "memory/allocation.hpp"

class ZPage;

class ZMarkCacheEntry {
private:
  ZPage*   _page;
  uint32_t _objects;
  size_t   _bytes;

public:
  ZMarkCacheEntry();

  void inc_live(ZPage* page, size_t bytes);
  void evict();
};

class ZMarkCache : public StackObj {
private:
  const size_t    _shift;
  ZMarkCacheEntry _cache[ZMarkCacheSize];

public:
  ZMarkCache(size_t nstripes);
  ~ZMarkCache();

  void inc_live(ZPage* page, size_t bytes);
};

#endif // SHARE_GC_Z_ZMARKCACHE_HPP