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src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp@e018e6884bd8 (annotated)

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

Wed, 23 Dec 2009 09:23:54 -0800

author

ysr

date

Wed, 23 Dec 2009 09:23:54 -0800

changeset 1580

e018e6884bd8

parent 574

c0492d52d55b

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa

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);
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
duke@435	53	void CMSPermGen::compute_new_size() {
duke@435	54	_gen->compute_new_size();
duke@435	55	}
duke@435	56
duke@435	57	void CMSPermGenGen::initialize_performance_counters() {
duke@435	58
duke@435	59	const char* gen_name = "perm";
duke@435	60
duke@435	61	// Generation Counters - generation 2, 1 subspace
duke@435	62	_gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
duke@435	63
duke@435	64	_gc_counters = NULL;
duke@435	65
duke@435	66	_space_counters = new GSpaceCounters(gen_name, 0,
duke@435	67	_virtual_space.reserved_size(),
duke@435	68	this, _gen_counters);
duke@435	69	}