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/*
* 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;
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; }
};
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