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src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp@e41cd7fd68a6 (annotated)

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

Fri, 01 Oct 2010 16:12:54 -0700

author

ysr

date

Fri, 01 Oct 2010 16:12:54 -0700

changeset 2194

e41cd7fd68a6

parent 1907

c18cbe5936b8

child 2314

f95d63e2154a

permissions

-rw-r--r--

6794422: Perm gen expansion policy for concurrent collectors
Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.
Reviewed-by: johnc

duke@435	1	/*
ysr@2194	2	* Copyright (c) 2007, 2010, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* 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);
apetrusenko@574	47	return mem_allocate_in_gen(size, _gen);
duke@435	48	} else {
apetrusenko@574	49	return mem_allocate_in_gen(size, _gen);
duke@435	50	}
duke@435	51	}
duke@435	52
ysr@2194	53	HeapWord* CMSPermGen::request_expand_and_allocate(Generation* gen,
ysr@2194	54	size_t size,
ysr@2194	55	GCCause::Cause prev_cause /* ignored */) {
ysr@2194	56	HeapWord* obj = gen->expand_and_allocate(size, false);
ysr@2194	57	if (gen->capacity() >= _capacity_expansion_limit) {
ysr@2194	58	set_capacity_expansion_limit(gen->capacity() + MaxPermHeapExpansion);
ysr@2194	59	assert(((ConcurrentMarkSweepGeneration*)gen)->should_concurrent_collect(),
ysr@2194	60	"Should kick off a collection if one not in progress");
ysr@2194	61	}
ysr@2194	62	return obj;
ysr@2194	63	}
ysr@2194	64
duke@435	65	void CMSPermGen::compute_new_size() {
duke@435	66	_gen->compute_new_size();
duke@435	67	}
duke@435	68
duke@435	69	void CMSPermGenGen::initialize_performance_counters() {
duke@435	70
duke@435	71	const char* gen_name = "perm";
duke@435	72
duke@435	73	// Generation Counters - generation 2, 1 subspace
duke@435	74	_gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
duke@435	75
duke@435	76	_gc_counters = NULL;
duke@435	77
duke@435	78	_space_counters = new GSpaceCounters(gen_name, 0,
duke@435	79	_virtual_space.reserved_size(),
duke@435	80	this, _gen_counters);
duke@435	81	}