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109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/*
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* Copyright (c) 2007 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/_cmsPermGen.cpp.incl"
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CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
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CardTableRS* ct,
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FreeBlockDictionary::DictionaryChoice dictionaryChoice) {
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CMSPermGenGen* g =
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new CMSPermGenGen(rs, initial_byte_size, -1, ct);
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if (g == NULL) {
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vm_exit_during_initialization("Could not allocate a CompactingPermGen");
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}
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g->initialize_performance_counters();
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_gen = g;
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}
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HeapWord* CMSPermGen::mem_allocate(size_t size) {
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Mutex* lock = _gen->freelistLock();
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bool lock_owned = lock->owned_by_self();
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if (lock_owned) {
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MutexUnlocker mul(lock);
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return mem_allocate_work(size);
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} else {
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return mem_allocate_work(size);
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}
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}
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HeapWord* CMSPermGen::mem_allocate_work(size_t size) {
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assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock");
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MutexLocker ml(Heap_lock);
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HeapWord* obj = NULL;
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obj = _gen->allocate(size, false);
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// Since we want to minimize pause times, we will prefer
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// expanding the perm gen rather than doing a stop-world
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// collection to satisfy the allocation request.
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if (obj == NULL) {
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// Try to expand the perm gen and allocate space.
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obj = _gen->expand_and_allocate(size, false, false);
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if (obj == NULL) {
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// Let's see if a normal stop-world full collection will
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// free up enough space.
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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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if (obj == NULL) {
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// The collection above may have shrunk the space, so try
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// to expand again and allocate space.
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obj = _gen->expand_and_allocate(size, false, false);
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}
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if (obj == NULL) {
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// We have not been able to allocate space despite a
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// full stop-world collection. We now make a last-ditch collection
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// attempt (in which soft refs are all aggressively freed)
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// that will try to reclaim as much space as possible.
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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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// Expand generation in case it was shrunk following the collection.
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obj = _gen->expand_and_allocate(size, false, false);
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}
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}
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}
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}
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return obj;
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}
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void CMSPermGen::compute_new_size() {
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_gen->compute_new_size();
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}
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void CMSPermGenGen::initialize_performance_counters() {
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const char* gen_name = "perm";
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// Generation Counters - generation 2, 1 subspace
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_gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
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_gc_counters = NULL;
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_space_counters = new GSpaceCounters(gen_name, 0,
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_virtual_space.reserved_size(),
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this, _gen_counters);
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}
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