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src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp"
aoqi@0	27	#include "memory/allocation.inline.hpp"
aoqi@0	28	#include "runtime/java.hpp"
aoqi@0	29
aoqi@0	30	AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,
aoqi@0	31	size_t min_low_byte_size,
aoqi@0	32	size_t min_high_byte_size,
aoqi@0	33	size_t alignment) :
aoqi@0	34	_reserved_space(rs), _min_low_byte_size(min_low_byte_size),
aoqi@0	35	_min_high_byte_size(min_high_byte_size), _low(0), _high(0),
aoqi@0	36	_alignment(alignment) {}
aoqi@0	37
aoqi@0	38	// The maximum byte sizes are for the initial layout of the
aoqi@0	39	// virtual spaces and are not the limit on the maximum bytes sizes.
aoqi@0	40	void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,
aoqi@0	41	size_t init_low_byte_size,
aoqi@0	42	size_t init_high_byte_size) {
aoqi@0	43
aoqi@0	44	// The reserved spaces for the two parts of the virtual space.
aoqi@0	45	ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size);
aoqi@0	46	ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);
aoqi@0	47
aoqi@0	48	_low = new PSVirtualSpace(old_rs, alignment());
aoqi@0	49	if (!_low->expand_by(init_low_byte_size)) {
aoqi@0	50	vm_exit_during_initialization("Could not reserve enough space for "
aoqi@0	51	"object heap");
aoqi@0	52	}
aoqi@0	53
aoqi@0	54	_high = new PSVirtualSpaceHighToLow(young_rs, alignment());
aoqi@0	55	if (!_high->expand_by(init_high_byte_size)) {
aoqi@0	56	vm_exit_during_initialization("Could not reserve enough space for "
aoqi@0	57	"object heap");
aoqi@0	58	}
aoqi@0	59	}
aoqi@0	60
aoqi@0	61	bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {
aoqi@0	62	assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
aoqi@0	63	size_t actual_change = low()->expand_into(high(), change_in_bytes);
aoqi@0	64	return actual_change != 0;
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {
aoqi@0	68	assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
aoqi@0	69	size_t actual_change = high()->expand_into(low(), change_in_bytes);
aoqi@0	70	return actual_change != 0;
aoqi@0	71	}