graal-jvmci-8: src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp annotate

annotate src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 22977:33e421924c67

8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 Summary: Allow use of large pages for auxiliary data structures in G1. Clean up existing interfaces. Reviewed-by: jmasa, pliden, stefank

author	tschatzl
date	Tue, 07 Apr 2015 10:53:51 +0200
parents	340ca8812af9
children

rev	line source
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	1 /*
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	4 *
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	7 * published by the Free Software Foundation.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	8 *
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	13 * accompanied this code).
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	14 *
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	18 *
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	20 * or visit www.oracle.com if you need additional information or have any
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	21 * questions.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	22 *
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	23 */
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	24
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	25 #include "precompiled.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	27 #include "oops/markOop.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	28 #include "oops/oop.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	29 #include "services/memTracker.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	30 #ifdef TARGET_OS_FAMILY_linux
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	31 # include "os_linux.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	32 #endif
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	33 #ifdef TARGET_OS_FAMILY_solaris
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	34 # include "os_solaris.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	35 #endif
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	36 #ifdef TARGET_OS_FAMILY_windows
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	37 # include "os_windows.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	38 #endif
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	39 #ifdef TARGET_OS_FAMILY_aix
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	40 # include "os_aix.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	41 #endif
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	42 #ifdef TARGET_OS_FAMILY_bsd
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	43 # include "os_bsd.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	44 #endif
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	45 #include "utilities/bitMap.inline.hpp"
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	46
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	48 _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	49 _dirty(), _executable(false) {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	50 initialize_with_page_size(rs, used_size, page_size);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	51 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	52
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	53 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	54 guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	55
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	56 assert(_low_boundary == NULL, "VirtualSpace already initialized");
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	57 assert(page_size > 0, "Page size must be non-zero.");
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	58
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	59 guarantee(is_ptr_aligned(rs.base(), page_size),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	60 err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	61 guarantee(is_size_aligned(used_size, os::vm_page_size()),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	62 err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	63 guarantee(used_size <= rs.size(),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	64 err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size()));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	65 guarantee(is_size_aligned(rs.size(), page_size),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	66 err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size));
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	67
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	68 _low_boundary = rs.base();
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	69 _high_boundary = _low_boundary + used_size;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	70
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	71 _special = rs.special();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	72 _executable = rs.executable();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	73
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	74 _page_size = page_size;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	75
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	76 assert(_committed.size() == 0, "virtual space initialized more than once");
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	77 BitMap::idx_t size_in_pages = rs.size() / page_size;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	78 _committed.resize(size_in_pages, /* in_resource_area */ false);
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	79 if (_special) {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	80 _dirty.resize(size_in_pages, /* in_resource_area */ false);
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	81 }
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	82
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	83 _tail_size = used_size % _page_size;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	84 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	85
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	86 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	87 release();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	88 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	89
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	90 void G1PageBasedVirtualSpace::release() {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	91 // This does not release memory it never reserved.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	92 // Caller must release via rs.release();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	93 _low_boundary = NULL;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	94 _high_boundary = NULL;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	95 _special = false;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	96 _executable = false;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	97 _page_size = 0;
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	98 _tail_size = 0;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	99 _committed.resize(0, false);
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	100 _dirty.resize(0, false);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	101 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	102
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	103 size_t G1PageBasedVirtualSpace::committed_size() const {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	104 size_t result = _committed.count_one_bits() * _page_size;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	105 // The last page might not be in full.
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	106 if (is_last_page_partial() && _committed.at(_committed.size() - 1)) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	107 result -= _page_size - _tail_size;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	108 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	109 return result;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	110 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	111
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	112 size_t G1PageBasedVirtualSpace::reserved_size() const {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	113 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	114 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	115
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	116 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	117 return reserved_size() - committed_size();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	118 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	119
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	120 size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	121 return (addr - _low_boundary) / _page_size;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	122 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	123
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	124 bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	125 size_t end_page = start_page + size_in_pages;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	126 return _committed.get_next_zero_offset(start_page, end_page) >= end_page;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	127 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	128
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	129 bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	130 size_t end_page = start_page + size_in_pages;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	131 return _committed.get_next_one_offset(start_page, end_page) >= end_page;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	132 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	133
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	134 char* G1PageBasedVirtualSpace::page_start(size_t index) const {
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	135 return _low_boundary + index * _page_size;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	136 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	137
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	138 bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	139 guarantee(index <= _committed.size(),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	140 err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size()));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	141 return index == _committed.size();
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	142 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	143
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	144 void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	145 assert(num_pages > 0, "No full pages to commit");
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	146 assert(start + num_pages <= _committed.size(),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	147 err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " "
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	148 "that is outside of managed space of " SIZE_FORMAT " pages",
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	149 start, start + num_pages, _committed.size()));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	150
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	151 char* start_addr = page_start(start);
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	152 size_t size = num_pages * _page_size;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	153
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	154 os::commit_memory_or_exit(start_addr, size, _page_size, _executable,
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	155 err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	156 p2i(start_addr), p2i(start_addr + size), size));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	157 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	158
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	159 void G1PageBasedVirtualSpace::commit_tail() {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	160 assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here");
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	161
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	162 char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size);
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	163 os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable,
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	164 err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	165 p2i(aligned_end_address), p2i(_high_boundary), _tail_size));
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	166 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	167
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	168 void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	169 guarantee(start_page < end_page,
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	170 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	171 guarantee(end_page <= _committed.size(),
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	172 err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size()));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	173
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	174 size_t pages = end_page - start_page;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	175 bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial();
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	176
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	177 // If we have to commit some (partial) tail area, decrease the amount of pages to avoid
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	178 // committing that in the full-page commit code.
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	179 if (need_to_commit_tail) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	180 pages--;
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	181 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	182
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	183 if (pages > 0) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	184 commit_preferred_pages(start_page, pages);
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	185 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	186
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	187 if (need_to_commit_tail) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	188 commit_tail();
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	189 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	190 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	191
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	192 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	193 return MIN2(_high_boundary, page_start(end_page));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	194 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	195
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	196 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	197 guarantee(start_page < end_page,
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	198 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	199
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	200 os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	201 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	202
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	203 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	204 // We need to make sure to commit all pages covered by the given area.
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	205 guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	206
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	207 bool zero_filled = true;
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	208 size_t end_page = start_page + size_in_pages;
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	209
ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	210 if (_special) {
ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	211 // Check for dirty pages and update zero_filled if any found.
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	212 if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	213 zero_filled = false;
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	214 _dirty.clear_range(start_page, end_page);
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	215 }
ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	216 } else {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	217 commit_internal(start_page, end_page);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	218 }
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	219 _committed.set_range(start_page, end_page);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	220
22973 340ca8812af9 8067469: G1 ignores AlwaysPreTouch tschatzl parents: 20795 diff changeset	221 if (AlwaysPreTouch) {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	222 pretouch_internal(start_page, end_page);
22973 340ca8812af9 8067469: G1 ignores AlwaysPreTouch tschatzl parents: 20795 diff changeset	223 }
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	224 return zero_filled;
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	225 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	226
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	227 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	228 guarantee(start_page < end_page,
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	229 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	230
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	231 char* start_addr = page_start(start_page);
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	232 os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	233 }
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	234
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	235 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	236 guarantee(is_area_committed(start_page, size_in_pages), "checking");
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	237
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	238 size_t end_page = start_page + size_in_pages;
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	239 if (_special) {
ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	240 // Mark that memory is dirty. If committed again the memory might
ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	241 // need to be cleared explicitly.
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	242 _dirty.set_range(start_page, end_page);
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	243 } else {
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	244 uncommit_internal(start_page, end_page);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	245 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	246
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	247 _committed.clear_range(start_page, end_page);
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	248 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	249
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	250 bool G1PageBasedVirtualSpace::contains(const void* p) const {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	251 return _low_boundary <= (const char) p && (const char) p < _high_boundary;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	252 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	253
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	254 #ifndef PRODUCT
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	255 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	256 out->print ("Virtual space:");
20795 ae52ee069062 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit sjohanss parents: 20338 diff changeset	257 if (_special) out->print(" (pinned in memory)");
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	258 out->cr();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	259 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	260 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
22977 33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	261 out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
33e421924c67 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29 tschatzl parents: 22973 diff changeset	262 out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	263 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	264
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	265 void G1PageBasedVirtualSpace::print() {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	266 print_on(tty);
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	267 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: diff changeset	268 #endif

Mercurial > hg > graal-jvmci-8

annotate src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 22977:33e421924c67