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src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp@a61af66fc99e (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 574

c0492d52d55b

permissions

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duke@435	1	/*
duke@435	2	* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_cmsPermGen.cpp.incl"
duke@435	27
duke@435	28	CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
duke@435	29	CardTableRS* ct,
duke@435	30	FreeBlockDictionary::DictionaryChoice dictionaryChoice) {
duke@435	31	CMSPermGenGen* g =
duke@435	32	new CMSPermGenGen(rs, initial_byte_size, -1, ct);
duke@435	33	if (g == NULL) {
duke@435	34	vm_exit_during_initialization("Could not allocate a CompactingPermGen");
duke@435	35	}
duke@435	36
duke@435	37	g->initialize_performance_counters();
duke@435	38
duke@435	39	_gen = g;
duke@435	40	}
duke@435	41
duke@435	42	HeapWord* CMSPermGen::mem_allocate(size_t size) {
duke@435	43	Mutex* lock = _gen->freelistLock();
duke@435	44	bool lock_owned = lock->owned_by_self();
duke@435	45	if (lock_owned) {
duke@435	46	MutexUnlocker mul(lock);
duke@435	47	return mem_allocate_work(size);
duke@435	48	} else {
duke@435	49	return mem_allocate_work(size);
duke@435	50	}
duke@435	51	}
duke@435	52
duke@435	53	HeapWord* CMSPermGen::mem_allocate_work(size_t size) {
duke@435	54	assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock");
duke@435	55
duke@435	56	MutexLocker ml(Heap_lock);
duke@435	57	HeapWord* obj = NULL;
duke@435	58
duke@435	59	obj = _gen->allocate(size, false);
duke@435	60	// Since we want to minimize pause times, we will prefer
duke@435	61	// expanding the perm gen rather than doing a stop-world
duke@435	62	// collection to satisfy the allocation request.
duke@435	63	if (obj == NULL) {
duke@435	64	// Try to expand the perm gen and allocate space.
duke@435	65	obj = _gen->expand_and_allocate(size, false, false);
duke@435	66	if (obj == NULL) {
duke@435	67	// Let's see if a normal stop-world full collection will
duke@435	68	// free up enough space.
duke@435	69	SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
duke@435	70	obj = _gen->allocate(size, false);
duke@435	71	if (obj == NULL) {
duke@435	72	// The collection above may have shrunk the space, so try
duke@435	73	// to expand again and allocate space.
duke@435	74	obj = _gen->expand_and_allocate(size, false, false);
duke@435	75	}
duke@435	76	if (obj == NULL) {
duke@435	77	// We have not been able to allocate space despite a
duke@435	78	// full stop-world collection. We now make a last-ditch collection
duke@435	79	// attempt (in which soft refs are all aggressively freed)
duke@435	80	// that will try to reclaim as much space as possible.
duke@435	81	SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
duke@435	82	obj = _gen->allocate(size, false);
duke@435	83	if (obj == NULL) {
duke@435	84	// Expand generation in case it was shrunk following the collection.
duke@435	85	obj = _gen->expand_and_allocate(size, false, false);
duke@435	86	}
duke@435	87	}
duke@435	88	}
duke@435	89	}
duke@435	90	return obj;
duke@435	91	}
duke@435	92
duke@435	93	void CMSPermGen::compute_new_size() {
duke@435	94	_gen->compute_new_size();
duke@435	95	}
duke@435	96
duke@435	97	void CMSPermGenGen::initialize_performance_counters() {
duke@435	98
duke@435	99	const char* gen_name = "perm";
duke@435	100
duke@435	101	// Generation Counters - generation 2, 1 subspace
duke@435	102	_gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
duke@435	103
duke@435	104	_gc_counters = NULL;
duke@435	105
duke@435	106	_space_counters = new GSpaceCounters(gen_name, 0,
duke@435	107	_virtual_space.reserved_size(),
duke@435	108	this, _gen_counters);
duke@435	109	}