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src/share/vm/gc_implementation/shared/immutableSpace.cpp@aaf61e68b255 (annotated)

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

Mon, 06 Aug 2012 12:20:14 -0700

author

johnc

date

Mon, 06 Aug 2012 12:20:14 -0700

changeset 3982

aaf61e68b255

parent 3711

b632e80fc9dc

child 4037

da91efe96a93

permissions

-rw-r--r--

6818524: G1: use ergonomic resizing of PLABs
Summary: Employ PLABStats instances to record information about survivor and old PLABs, and use the recorded stats to adjust the sizes of survivor and old PLABS.
Reviewed-by: johnc, ysr
Contributed-by: Brandon Mitchell <brandon@twitter.com>

duke@435	1	/*
brutisso@3711	2	* Copyright (c) 2001, 2012, 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
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#ifndef SERIALGC
stefank@2314	27	#include "gc_implementation/shared/immutableSpace.hpp"
stefank@2314	28	#include "memory/universe.hpp"
stefank@2314	29	#include "oops/oop.inline.hpp"
stefank@2314	30	#endif
duke@435	31
duke@435	32	void ImmutableSpace::initialize(MemRegion mr) {
duke@435	33	HeapWord* bottom = mr.start();
duke@435	34	HeapWord* end = mr.end();
duke@435	35
duke@435	36	assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end),
duke@435	37	"invalid space boundaries");
duke@435	38
duke@435	39	_bottom = bottom;
duke@435	40	_end = end;
duke@435	41	}
duke@435	42
duke@435	43	void ImmutableSpace::oop_iterate(OopClosure* cl) {
duke@435	44	HeapWord* obj_addr = bottom();
duke@435	45	HeapWord* t = end();
duke@435	46	// Could call objects iterate, but this is easier.
duke@435	47	while (obj_addr < t) {
duke@435	48	obj_addr += oop(obj_addr)->oop_iterate(cl);
duke@435	49	}
duke@435	50	}
duke@435	51
duke@435	52	void ImmutableSpace::object_iterate(ObjectClosure* cl) {
duke@435	53	HeapWord* p = bottom();
duke@435	54	while (p < end()) {
duke@435	55	cl->do_object(oop(p));
duke@435	56	p += oop(p)->size();
duke@435	57	}
duke@435	58	}
duke@435	59
duke@435	60	#ifndef PRODUCT
duke@435	61
duke@435	62	void ImmutableSpace::print_short() const {
duke@435	63	tty->print(" space " SIZE_FORMAT "K, 100%% used", capacity_in_bytes() / K);
duke@435	64	}
duke@435	65
duke@435	66	void ImmutableSpace::print() const {
duke@435	67	print_short();
duke@435	68	tty->print_cr(" [%#-6lx,%#-6lx)", bottom(), end());
duke@435	69	}
duke@435	70
duke@435	71	#endif
duke@435	72
brutisso@3711	73	void ImmutableSpace::verify() {
duke@435	74	HeapWord* p = bottom();
duke@435	75	HeapWord* t = end();
duke@435	76	HeapWord* prev_p = NULL;
duke@435	77	while (p < t) {
duke@435	78	oop(p)->verify();
duke@435	79	prev_p = p;
duke@435	80	p += oop(p)->size();
duke@435	81	}
duke@435	82	guarantee(p == end(), "end of last object must match end of space");
duke@435	83	}