1 /*
2 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
98 }
99 }
100
101 inline void PSPromotionManager::push_contents(oop obj) {
102 obj->ps_push_contents(this);
103 }
104 //
105 // This method is pretty bulky. It would be nice to split it up
106 // into smaller submethods, but we need to be careful not to hurt
107 // performance.
108 //
109 template<bool promote_immediately>
110 inline oop PSPromotionManager::copy_to_survivor_space(oop o) {
111 assert(should_scavenge(&o), "Sanity");
112
113 oop new_obj = NULL;
114
115 // NOTE! We must be very careful with any methods that access the mark
116 // in o. There may be multiple threads racing on it, and it may be forwarded
117 // at any time. Do not use oop methods for accessing the mark!
118 markOop test_mark = o->mark();
119
120 // The same test as "o->is_forwarded()"
121 if (!test_mark->is_marked()) {
122 bool new_obj_is_tenured = false;
123 size_t new_obj_size = o->size();
124
125 // Find the objects age, MT safe.
126 uint age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
127 test_mark->displaced_mark_helper()->age() : test_mark->age();
128
129 if (!promote_immediately) {
130 // Try allocating obj in to-space (unless too old)
131 if (age < PSScavenge::tenuring_threshold()) {
132 new_obj = (oop) _young_lab.allocate(new_obj_size);
133 if (new_obj == NULL && !_young_gen_is_full) {
134 // Do we allocate directly, or flush and refill?
135 if (new_obj_size > (YoungPLABSize / 2)) {
136 // Allocate this object directly
137 new_obj = (oop)young_space()->cas_allocate(new_obj_size);
138 promotion_trace_event(new_obj, o, new_obj_size, age, false, NULL);
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1 /*
2 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
98 }
99 }
100
101 inline void PSPromotionManager::push_contents(oop obj) {
102 obj->ps_push_contents(this);
103 }
104 //
105 // This method is pretty bulky. It would be nice to split it up
106 // into smaller submethods, but we need to be careful not to hurt
107 // performance.
108 //
109 template<bool promote_immediately>
110 inline oop PSPromotionManager::copy_to_survivor_space(oop o) {
111 assert(should_scavenge(&o), "Sanity");
112
113 oop new_obj = NULL;
114
115 // NOTE! We must be very careful with any methods that access the mark
116 // in o. There may be multiple threads racing on it, and it may be forwarded
117 // at any time. Do not use oop methods for accessing the mark!
118 markOop test_mark = o->mark_raw();
119
120 // The same test as "o->is_forwarded()"
121 if (!test_mark->is_marked()) {
122 bool new_obj_is_tenured = false;
123 size_t new_obj_size = o->size();
124
125 // Find the objects age, MT safe.
126 uint age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
127 test_mark->displaced_mark_helper()->age() : test_mark->age();
128
129 if (!promote_immediately) {
130 // Try allocating obj in to-space (unless too old)
131 if (age < PSScavenge::tenuring_threshold()) {
132 new_obj = (oop) _young_lab.allocate(new_obj_size);
133 if (new_obj == NULL && !_young_gen_is_full) {
134 // Do we allocate directly, or flush and refill?
135 if (new_obj_size > (YoungPLABSize / 2)) {
136 // Allocate this object directly
137 new_obj = (oop)young_space()->cas_allocate(new_obj_size);
138 promotion_trace_event(new_obj, o, new_obj_size, age, false, NULL);
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