1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp Sat Dec 01 00:00:00 2007 +0000 1.3 @@ -0,0 +1,109 @@ 1.4 +/* 1.5 + * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or 1.24 + * have any questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +#include "incls/_precompiled.incl" 1.29 +#include "incls/_cmsPermGen.cpp.incl" 1.30 + 1.31 +CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size, 1.32 + CardTableRS* ct, 1.33 + FreeBlockDictionary::DictionaryChoice dictionaryChoice) { 1.34 + CMSPermGenGen* g = 1.35 + new CMSPermGenGen(rs, initial_byte_size, -1, ct); 1.36 + if (g == NULL) { 1.37 + vm_exit_during_initialization("Could not allocate a CompactingPermGen"); 1.38 + } 1.39 + 1.40 + g->initialize_performance_counters(); 1.41 + 1.42 + _gen = g; 1.43 +} 1.44 + 1.45 +HeapWord* CMSPermGen::mem_allocate(size_t size) { 1.46 + Mutex* lock = _gen->freelistLock(); 1.47 + bool lock_owned = lock->owned_by_self(); 1.48 + if (lock_owned) { 1.49 + MutexUnlocker mul(lock); 1.50 + return mem_allocate_work(size); 1.51 + } else { 1.52 + return mem_allocate_work(size); 1.53 + } 1.54 +} 1.55 + 1.56 +HeapWord* CMSPermGen::mem_allocate_work(size_t size) { 1.57 + assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock"); 1.58 + 1.59 + MutexLocker ml(Heap_lock); 1.60 + HeapWord* obj = NULL; 1.61 + 1.62 + obj = _gen->allocate(size, false); 1.63 + // Since we want to minimize pause times, we will prefer 1.64 + // expanding the perm gen rather than doing a stop-world 1.65 + // collection to satisfy the allocation request. 1.66 + if (obj == NULL) { 1.67 + // Try to expand the perm gen and allocate space. 1.68 + obj = _gen->expand_and_allocate(size, false, false); 1.69 + if (obj == NULL) { 1.70 + // Let's see if a normal stop-world full collection will 1.71 + // free up enough space. 1.72 + SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full); 1.73 + obj = _gen->allocate(size, false); 1.74 + if (obj == NULL) { 1.75 + // The collection above may have shrunk the space, so try 1.76 + // to expand again and allocate space. 1.77 + obj = _gen->expand_and_allocate(size, false, false); 1.78 + } 1.79 + if (obj == NULL) { 1.80 + // We have not been able to allocate space despite a 1.81 + // full stop-world collection. We now make a last-ditch collection 1.82 + // attempt (in which soft refs are all aggressively freed) 1.83 + // that will try to reclaim as much space as possible. 1.84 + SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection); 1.85 + obj = _gen->allocate(size, false); 1.86 + if (obj == NULL) { 1.87 + // Expand generation in case it was shrunk following the collection. 1.88 + obj = _gen->expand_and_allocate(size, false, false); 1.89 + } 1.90 + } 1.91 + } 1.92 + } 1.93 + return obj; 1.94 +} 1.95 + 1.96 +void CMSPermGen::compute_new_size() { 1.97 + _gen->compute_new_size(); 1.98 +} 1.99 + 1.100 +void CMSPermGenGen::initialize_performance_counters() { 1.101 + 1.102 + const char* gen_name = "perm"; 1.103 + 1.104 + // Generation Counters - generation 2, 1 subspace 1.105 + _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); 1.106 + 1.107 + _gc_counters = NULL; 1.108 + 1.109 + _space_counters = new GSpaceCounters(gen_name, 0, 1.110 + _virtual_space.reserved_size(), 1.111 + this, _gen_counters); 1.112 +}