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Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently. Reviewed-by: johnc
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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class CardTableRS; // fwd decl
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class ConcurrentMarkSweepGeneration;
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// A PermGen implemented with a CMS space, collected by a CMS collector.
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class CMSPermGen: public PermGen {
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friend class VMStructs;
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protected:
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// The "generation" view.
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ConcurrentMarkSweepGeneration* _gen;
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// Override default implementation from PermGen
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virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
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GCCause::Cause prev_cause);
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public:
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CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
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CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);
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HeapWord* mem_allocate(size_t size);
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void compute_new_size();
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Generation* as_gen() const { return _gen; }
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};
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// This is the "generation" view of a CMSPermGen.
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class CMSPermGenGen: public ConcurrentMarkSweepGeneration {
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// Abstractly, this is a subtype that gets access to protected fields.
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friend class CMSPermGen;
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public:
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CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size,
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int level, CardTableRS* ct):
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// See comments in the constructor for CompactibleFreeListSpace
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// regarding not using adaptive free lists for a perm gen.
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ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion
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level, ct, false /* use adaptive freelists */,
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(FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice)
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{}
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void initialize_performance_counters();
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const char* name() const {
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return "concurrent-mark-sweep perm gen";
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}
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const char* short_name() const {
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return "CMS Perm";
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}
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bool must_be_youngest() const { return false; }
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bool must_be_oldest() const { return false; }
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};
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