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src/share/vm/gc_implementation/shared/immutableSpace.cpp@0bfd3fb24150 (annotated)

src/share/vm/gc_implementation/shared/immutableSpace.cpp

Tue, 13 Apr 2010 13:52:10 -0700

author

jmasa

date

Tue, 13 Apr 2010 13:52:10 -0700

changeset 1822

0bfd3fb24150

parent 631

d1605aabd0a1

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes

duke@435	1	/*
xdono@631	2	* Copyright 2001-2008 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/_immutableSpace.cpp.incl"
duke@435	27
duke@435	28	void ImmutableSpace::initialize(MemRegion mr) {
duke@435	29	HeapWord* bottom = mr.start();
duke@435	30	HeapWord* end = mr.end();
duke@435	31
duke@435	32	assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end),
duke@435	33	"invalid space boundaries");
duke@435	34
duke@435	35	_bottom = bottom;
duke@435	36	_end = end;
duke@435	37	}
duke@435	38
duke@435	39	void ImmutableSpace::oop_iterate(OopClosure* cl) {
duke@435	40	HeapWord* obj_addr = bottom();
duke@435	41	HeapWord* t = end();
duke@435	42	// Could call objects iterate, but this is easier.
duke@435	43	while (obj_addr < t) {
duke@435	44	obj_addr += oop(obj_addr)->oop_iterate(cl);
duke@435	45	}
duke@435	46	}
duke@435	47
duke@435	48	void ImmutableSpace::object_iterate(ObjectClosure* cl) {
duke@435	49	HeapWord* p = bottom();
duke@435	50	while (p < end()) {
duke@435	51	cl->do_object(oop(p));
duke@435	52	p += oop(p)->size();
duke@435	53	}
duke@435	54	}
duke@435	55
duke@435	56	#ifndef PRODUCT
duke@435	57
duke@435	58	void ImmutableSpace::print_short() const {
duke@435	59	tty->print(" space " SIZE_FORMAT "K, 100%% used", capacity_in_bytes() / K);
duke@435	60	}
duke@435	61
duke@435	62	void ImmutableSpace::print() const {
duke@435	63	print_short();
duke@435	64	tty->print_cr(" [%#-6lx,%#-6lx)", bottom(), end());
duke@435	65	}
duke@435	66
duke@435	67	#endif
duke@435	68
iveresov@625	69	void ImmutableSpace::verify(bool allow_dirty) {
duke@435	70	HeapWord* p = bottom();
duke@435	71	HeapWord* t = end();
duke@435	72	HeapWord* prev_p = NULL;
duke@435	73	while (p < t) {
duke@435	74	oop(p)->verify();
duke@435	75	prev_p = p;
duke@435	76	p += oop(p)->size();
duke@435	77	}
duke@435	78	guarantee(p == end(), "end of last object must match end of space");
duke@435	79	}