Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp @ 65:99269dbf4ba8
6674588: (Escape Analysis) Improve Escape Analysis code
Summary: Current EA code has several problems which have to be fixed.
Reviewed-by: jrose, sgoldman
author | kvn |
---|---|
date | Fri, 14 Mar 2008 15:26:33 -0700 |
parents | a61af66fc99e |
children | c0492d52d55b |
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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. * */ #include "incls/_precompiled.incl" #include "incls/_cmsPermGen.cpp.incl" CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size, CardTableRS* ct, FreeBlockDictionary::DictionaryChoice dictionaryChoice) { CMSPermGenGen* g = new CMSPermGenGen(rs, initial_byte_size, -1, ct); if (g == NULL) { vm_exit_during_initialization("Could not allocate a CompactingPermGen"); } g->initialize_performance_counters(); _gen = g; } HeapWord* CMSPermGen::mem_allocate(size_t size) { Mutex* lock = _gen->freelistLock(); bool lock_owned = lock->owned_by_self(); if (lock_owned) { MutexUnlocker mul(lock); return mem_allocate_work(size); } else { return mem_allocate_work(size); } } HeapWord* CMSPermGen::mem_allocate_work(size_t size) { assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock"); MutexLocker ml(Heap_lock); HeapWord* obj = NULL; obj = _gen->allocate(size, false); // Since we want to minimize pause times, we will prefer // expanding the perm gen rather than doing a stop-world // collection to satisfy the allocation request. if (obj == NULL) { // Try to expand the perm gen and allocate space. obj = _gen->expand_and_allocate(size, false, false); if (obj == NULL) { // Let's see if a normal stop-world full collection will // free up enough space. SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full); obj = _gen->allocate(size, false); if (obj == NULL) { // The collection above may have shrunk the space, so try // to expand again and allocate space. obj = _gen->expand_and_allocate(size, false, false); } if (obj == NULL) { // We have not been able to allocate space despite a // full stop-world collection. We now make a last-ditch collection // attempt (in which soft refs are all aggressively freed) // that will try to reclaim as much space as possible. SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection); obj = _gen->allocate(size, false); if (obj == NULL) { // Expand generation in case it was shrunk following the collection. obj = _gen->expand_and_allocate(size, false, false); } } } } return obj; } void CMSPermGen::compute_new_size() { _gen->compute_new_size(); } void CMSPermGenGen::initialize_performance_counters() { const char* gen_name = "perm"; // Generation Counters - generation 2, 1 subspace _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); _gc_counters = NULL; _space_counters = new GSpaceCounters(gen_name, 0, _virtual_space.reserved_size(), this, _gen_counters); }