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src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp@e018e6884bd8 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp

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

author

ysr

date

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

changeset 1580

e018e6884bd8

parent 435

a61af66fc99e

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 2002 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	///////////// Locking verification specific to CMS //////////////
duke@435	26	// Much like "assert_lock_strong()", except
duke@435	27	// that it relaxes the assertion somewhat for the parallel GC case, where
duke@435	28	// main GC thread or the CMS thread might hold the lock on behalf of
duke@435	29	// the parallel threads.
duke@435	30	class CMSLockVerifier: AllStatic {
duke@435	31	public:
ysr@1580	32	static void assert_locked(const Mutex* lock, const Mutex* p_lock1, const Mutex* p_lock2)
duke@435	33	PRODUCT_RETURN;
ysr@1580	34	static void assert_locked(const Mutex* lock, const Mutex* p_lock) {
ysr@1580	35	assert_locked(lock, p_lock, NULL);
ysr@1580	36	}
duke@435	37	static void assert_locked(const Mutex* lock) {
duke@435	38	assert_locked(lock, NULL);
duke@435	39	}
duke@435	40	};