1 /*
   2  * Copyright (c) 2001, 2005, 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 
  25 class AdaptivePaddedAverage;
  26 
  27 class PSPermGen : public PSOldGen {
  28   friend class VMStructs;
  29  protected:
  30   AdaptivePaddedAverage* _avg_size;  // Used for sizing
  31   size_t _last_used;                 // Amount used at last GC, used for sizing
  32 
  33  public:
  34   // Initialize the generation.
  35   PSPermGen(ReservedSpace rs, size_t alignment, size_t initial_byte_size,
  36             size_t minimum_byte_size, size_t maximum_byte_size,
  37             const char* gen_name, int level);
  38 
  39   // Permanent Gen special allocation. Uses the OldGen allocation
  40   // routines, which should not be directly called on this generation.
  41   HeapWord* allocate_permanent(size_t word_size);
  42 
  43   // Size calculation.
  44   void compute_new_size(size_t used_before_collection);
  45 
  46   // MarkSweep code
  47   virtual void precompact();
  48 
  49   // Parallel old
  50   virtual void move_and_update(ParCompactionManager* cm);
  51 
  52   virtual const char* name() const { return "PSPermGen"; }
  53 };