annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp @ 94:0834225a7916

6634032: CMS: Need CMSInitiatingPermOccupancyFraction for perm, divorcing from CMSInitiatingOccupancyFraction Summary: The option CMSInitiatingPermOccupancyFraction now controls perm triggering threshold. Even though the actual value of the threshold has not yet been changed, so there is no change in policy, we now have the infrastructure in place for dynamically deciding when to collect the perm gen, an issue that will be addressed in the near future. Reviewed-by: jmasa
author ysr
date Sun, 16 Mar 2008 21:57:25 -0700
parents a61af66fc99e
children c0492d52d55b
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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 };