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1 /*
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2 * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class CardTableRS; // fwd decl
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26 class ConcurrentMarkSweepGeneration;
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27
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28 // A PermGen implemented with a CMS space, collected by a CMS collector.
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29 class CMSPermGen: public PermGen {
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30 friend class VMStructs;
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31
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32 HeapWord* mem_allocate_work(size_t size);
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33 protected:
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34 // The "generation" view.
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35 ConcurrentMarkSweepGeneration* _gen;
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36
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37 public:
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38 CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
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39 CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);
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40
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41 HeapWord* mem_allocate(size_t size);
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42
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43 void compute_new_size();
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44
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45 Generation* as_gen() const { return _gen; }
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46 };
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47
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48 // This is the "generation" view of a CMSPermGen.
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49 class CMSPermGenGen: public ConcurrentMarkSweepGeneration {
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50 // Abstractly, this is a subtype that gets access to protected fields.
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51 friend class CMSPermGen;
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52 public:
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53 CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size,
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54 int level, CardTableRS* ct):
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55 // See comments in the constructor for CompactibleFreeListSpace
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56 // regarding not using adaptive free lists for a perm gen.
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57 ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion
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58 level, ct, false /* use adaptive freelists */,
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59 (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice)
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60 {}
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61
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62 void initialize_performance_counters();
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63
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64 const char* name() const {
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65 return "concurrent-mark-sweep perm gen";
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66 }
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67
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68 const char* short_name() const {
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69 return "CMS Perm";
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70 }
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71
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72 bool must_be_youngest() const { return false; }
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73 bool must_be_oldest() const { return false; }
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74 };
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