Mercurial > hg > truffle
diff src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c0492d52d55b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +class CardTableRS; // fwd decl +class ConcurrentMarkSweepGeneration; + +// A PermGen implemented with a CMS space, collected by a CMS collector. +class CMSPermGen: public PermGen { + friend class VMStructs; + + HeapWord* mem_allocate_work(size_t size); + protected: + // The "generation" view. + ConcurrentMarkSweepGeneration* _gen; + + public: + CMSPermGen(ReservedSpace rs, size_t initial_byte_size, + CardTableRS* ct, FreeBlockDictionary::DictionaryChoice); + + HeapWord* mem_allocate(size_t size); + + void compute_new_size(); + + Generation* as_gen() const { return _gen; } +}; + +// This is the "generation" view of a CMSPermGen. +class CMSPermGenGen: public ConcurrentMarkSweepGeneration { + // Abstractly, this is a subtype that gets access to protected fields. + friend class CMSPermGen; +public: + CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size, + int level, CardTableRS* ct): + // See comments in the constructor for CompactibleFreeListSpace + // regarding not using adaptive free lists for a perm gen. + ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion + level, ct, false /* use adaptive freelists */, + (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice) + {} + + void initialize_performance_counters(); + + const char* name() const { + return "concurrent-mark-sweep perm gen"; + } + + const char* short_name() const { + return "CMS Perm"; + } + + bool must_be_youngest() const { return false; } + bool must_be_oldest() const { return false; } +};