Tue, 26 Nov 2013 14:35:38 +0100
8027675: Full collections with Serial slower in JDK 8 compared to 7u40
Summary: Reduced the number of calls to follow_class_loader and instead marked and pushed the klass holder directly. Also removed unneeded calls to adjust_klass.
Reviewed-by: coleenp, jmasa, mgerdin, tschatzl
1 /*
2 * Copyright (c) 1997, 2013, 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 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/altHashing.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "runtime/handles.inline.hpp"
30 #include "runtime/thread.inline.hpp"
31 #include "utilities/copy.hpp"
33 bool always_do_update_barrier = false;
35 BarrierSet* oopDesc::_bs = NULL;
37 void oopDesc::print_on(outputStream* st) const {
38 if (this == NULL) {
39 st->print_cr("NULL");
40 } else {
41 klass()->oop_print_on(oop(this), st);
42 }
43 }
45 void oopDesc::print_address_on(outputStream* st) const {
46 if (PrintOopAddress) {
47 st->print("{"INTPTR_FORMAT"}", this);
48 }
49 }
51 void oopDesc::print() { print_on(tty); }
53 void oopDesc::print_address() { print_address_on(tty); }
55 char* oopDesc::print_string() {
56 stringStream st;
57 print_on(&st);
58 return st.as_string();
59 }
61 void oopDesc::print_value() {
62 print_value_on(tty);
63 }
65 char* oopDesc::print_value_string() {
66 char buf[100];
67 stringStream st(buf, sizeof(buf));
68 print_value_on(&st);
69 return st.as_string();
70 }
72 void oopDesc::print_value_on(outputStream* st) const {
73 oop obj = oop(this);
74 if (this == NULL) {
75 st->print("NULL");
76 } else if (java_lang_String::is_instance(obj)) {
77 java_lang_String::print(obj, st);
78 if (PrintOopAddress) print_address_on(st);
79 } else {
80 klass()->oop_print_value_on(obj, st);
81 }
82 }
85 void oopDesc::verify_on(outputStream* st) {
86 if (this != NULL) {
87 klass()->oop_verify_on(this, st);
88 }
89 }
92 void oopDesc::verify() {
93 verify_on(tty);
94 }
96 intptr_t oopDesc::slow_identity_hash() {
97 // slow case; we have to acquire the micro lock in order to locate the header
98 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
99 HandleMark hm;
100 Handle object(this);
101 return ObjectSynchronizer::identity_hash_value_for(object);
102 }
104 // When String table needs to rehash
105 unsigned int oopDesc::new_hash(jint seed) {
106 EXCEPTION_MARK;
107 ResourceMark rm;
108 int length;
109 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
110 if (chars != NULL) {
111 // Use alternate hashing algorithm on the string
112 return AltHashing::murmur3_32(seed, chars, length);
113 } else {
114 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
115 return 0;
116 }
117 }
119 VerifyOopClosure VerifyOopClosure::verify_oop;
121 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
122 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }