jdk-24/hotspot/src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.hpp

/*
 * Copyright (c) 2003, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

class ASPSYoungGen : public PSYoungGen {
  friend class VMStructs;
 private:
  size_t _gen_size_limit;
 protected:
  virtual size_t available_to_live();

 public:
  ASPSYoungGen(size_t         initial_byte_size,
               size_t         minimum_byte_size,
               size_t         byte_size_limit);

  ASPSYoungGen(PSVirtualSpace* vs,
               size_t         initial_byte_size,
               size_t         minimum_byte_size,
               size_t         byte_size_limit);

  void initialize(ReservedSpace rs, size_t alignment);
  void initialize_virtual_space(ReservedSpace rs, size_t alignment);

  size_t gen_size_limit() { return _gen_size_limit; }
  void set_gen_size_limit(size_t v) { _gen_size_limit = v; }

  bool resize_generation(size_t eden_size, size_t survivor_size);
  void resize_spaces(size_t eden_size, size_t survivor_size);

  // Adjust eden to be consistent with the virtual space.
  void reset_after_change();

  // Adaptive size policy support
  // Return number of bytes that the generation can expand/contract.
  size_t available_for_expansion();
  size_t available_for_contraction();

  // Accessors
  void set_reserved(MemRegion v) { _reserved = v; }

  // Printing support
  virtual const char* short_name() const { return "ASPSYoungGen"; }
};