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src/share/vm/memory/gcLocker.inline.hpp@7b0e9cba0307 (annotated)

src/share/vm/memory/gcLocker.inline.hpp

Wed, 13 Jan 2010 15:26:39 -0800

author

ysr

date

Wed, 13 Jan 2010 15:26:39 -0800

changeset 1601

7b0e9cba0307

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6896647: card marks can be deferred too long
Summary: Deferred card marks are now flushed during the gc prologue. Parallel[Scavege,OldGC] and SerialGC no longer defer card marks generated by COMPILER2 as a result of ReduceInitialCardMarks. For these cases, introduced a diagnostic option to defer the card marks, only for the purposes of testing and diagnostics. CMS and G1 continue to defer card marks. Potential performance concern related to single-threaded flushing of deferred card marks in the gc prologue will be addressed in the future.
Reviewed-by: never, johnc

duke@435	1	/*
duke@435	2	* Copyright 2000-2005 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	inline bool GC_locker::is_active() {
duke@435	26	return _lock_count > 0 || _jni_lock_count > 0;
duke@435	27	}
duke@435	28
duke@435	29	inline bool GC_locker::check_active_before_gc() {
duke@435	30	if (is_active()) {
duke@435	31	set_needs_gc();
duke@435	32	}
duke@435	33	return is_active();
duke@435	34	}
duke@435	35
duke@435	36	inline void GC_locker::lock() {
duke@435	37	// cast away volatile
duke@435	38	Atomic::inc(&_lock_count);
duke@435	39	CHECK_UNHANDLED_OOPS_ONLY(
duke@435	40	if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
duke@435	41	assert(Universe::heap() == NULL ||
duke@435	42	!Universe::heap()->is_gc_active(), "locking failed");
duke@435	43	}
duke@435	44
duke@435	45	inline void GC_locker::unlock() {
duke@435	46	// cast away volatile
duke@435	47	Atomic::dec(&_lock_count);
duke@435	48	CHECK_UNHANDLED_OOPS_ONLY(
duke@435	49	if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
duke@435	50	}
duke@435	51
duke@435	52	inline void GC_locker::lock_critical(JavaThread* thread) {
duke@435	53	if (!thread->in_critical()) {
duke@435	54	if (!needs_gc()) {
duke@435	55	jni_lock();
duke@435	56	} else {
duke@435	57	jni_lock_slow();
duke@435	58	}
duke@435	59	}
duke@435	60	thread->enter_critical();
duke@435	61	}
duke@435	62
duke@435	63	inline void GC_locker::unlock_critical(JavaThread* thread) {
duke@435	64	thread->exit_critical();
duke@435	65	if (!thread->in_critical()) {
duke@435	66	if (!needs_gc()) {
duke@435	67	jni_unlock();
duke@435	68	} else {
duke@435	69	jni_unlock_slow();
duke@435	70	}
duke@435	71	}
duke@435	72	}