93 lines
3.7 KiB
C++
93 lines
3.7 KiB
C++
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/*
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* Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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#include "incls/_precompiled.incl"
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#include "incls/_permGen.cpp.incl"
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CompactingPermGen::CompactingPermGen(ReservedSpace rs,
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ReservedSpace shared_rs,
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size_t initial_byte_size,
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GenRemSet* remset,
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PermanentGenerationSpec* perm_spec)
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{
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CompactingPermGenGen* g =
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new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset,
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NULL, perm_spec);
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if (g == NULL)
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vm_exit_during_initialization("Could not allocate a CompactingPermGen");
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_gen = g;
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g->initialize_performance_counters();
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_capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion;
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}
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HeapWord* CompactingPermGen::mem_allocate(size_t size) {
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MutexLocker ml(Heap_lock);
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HeapWord* obj = _gen->allocate(size, false);
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bool tried_collection = false;
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bool tried_expansion = false;
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while (obj == NULL) {
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if (_gen->capacity() >= _capacity_expansion_limit || tried_expansion) {
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// Expansion limit reached, try collection before expanding further
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// For now we force a full collection, this could be changed
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SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
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obj = _gen->allocate(size, false);
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tried_collection = true;
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tried_expansion = false; // ... following the collection:
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// the collection may have shrunk the space.
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}
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if (obj == NULL && !tried_expansion) {
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obj = _gen->expand_and_allocate(size, false);
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tried_expansion = true;
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}
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if (obj == NULL && tried_collection && tried_expansion) {
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// We have not been able to allocate despite a collection and
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// an attempted space expansion. We now make a last-ditch collection
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// attempt that will try to reclaim as much space as possible (for
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// example by aggressively clearing all soft refs).
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SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
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obj = _gen->allocate(size, false);
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if (obj == NULL) {
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// An expansion attempt is necessary since the previous
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// collection may have shrunk the space.
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obj = _gen->expand_and_allocate(size, false);
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}
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break;
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}
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}
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return obj;
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}
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void CompactingPermGen::compute_new_size() {
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size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion);
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if (desired_capacity < PermSize) {
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desired_capacity = PermSize;
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}
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if (_gen->capacity() > desired_capacity) {
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_gen->shrink(_gen->capacity() - desired_capacity);
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}
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_capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion;
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}
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