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annotate src/share/vm/runtime/dtraceJSDT.cpp @ 2368:dde920245681

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6896099: Integrate CMS heap ergo with default heap sizing ergo 6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m 7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification 7027529: CMS: retire CMSUseOldDefaults flag Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago. Reviewed-by: brutisso, poonam
author ysr
date Wed, 16 Mar 2011 10:37:08 -0700
parents f95d63e2154a
children b8a4e1d372a0
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1 /*
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "code/codeBlob.hpp"
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28 #include "memory/allocation.hpp"
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29 #include "prims/jvm.h"
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30 #include "runtime/dtraceJSDT.hpp"
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31 #include "runtime/jniHandles.hpp"
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32 #include "runtime/os.hpp"
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33 #include "utilities/exceptions.hpp"
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34 #include "utilities/globalDefinitions.hpp"
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35 #include "utilities/utf8.hpp"
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36
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37 #ifdef HAVE_DTRACE_H
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38
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39 jlong DTraceJSDT::activate(
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40 jint version, jstring module_name, jint providers_count,
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41 JVM_DTraceProvider* providers, TRAPS) {
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42
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43 size_t count = 0;
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44 RegisteredProbes* probes = NULL;
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45
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46 if (!is_supported()) {
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47 return 0;
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48 }
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49
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50 assert(module_name != NULL, "valid module name");
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51 assert(providers != NULL, "valid provider array");
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52
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53 for (int i = 0; i < providers_count; ++i) {
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54 count += providers[i].probe_count;
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55 }
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56 probes = new RegisteredProbes(count);
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57 count = 0;
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58
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59 for (int i = 0; i < providers_count; ++i) {
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60 assert(providers[i].name != NULL, "valid provider name");
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61 assert(providers[i].probe_count == 0 || providers[i].probes != NULL,
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62 "valid probe count");
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63 for (int j = 0; j < providers[i].probe_count; ++j) {
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64 JVM_DTraceProbe* probe = &(providers[i].probes[j]);
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65 assert(probe != NULL, "valid probe");
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66 assert(probe->method != NULL, "valid method");
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67 assert(probe->name != NULL, "valid probe name");
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68 assert(probe->function != NULL, "valid probe function spec");
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69 methodHandle h_method =
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70 methodHandle(THREAD, JNIHandles::resolve_jmethod_id(probe->method));
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71 nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method);
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72 if (nm == NULL) {
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73 delete probes;
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74 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),
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75 "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods).");
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76 }
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77 h_method()->set_not_compilable();
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78 h_method()->set_code(h_method, nm);
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79 probes->nmethod_at_put(count++, nm);
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80 }
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81 }
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82
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83 int handle = pd_activate((void*)probes,
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84 module_name, providers_count, providers);
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85 if (handle <= 0) {
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86 delete probes;
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87 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),
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88 "Unable to register DTrace probes (internal error).");
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89 }
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90 probes->set_helper_handle(handle);
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91 return RegisteredProbes::toOpaqueProbes(probes);
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92 }
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93
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94 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {
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95 methodOop m = JNIHandles::resolve_jmethod_id(method);
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96 return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap();
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97 }
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98
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99 void DTraceJSDT::dispose(OpaqueProbes probes) {
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100 RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes);
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101 if (probes != -1 && p != NULL) {
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102 pd_dispose(p->helper_handle());
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103 delete p;
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104 }
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105 }
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106
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107 jboolean DTraceJSDT::is_supported() {
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108 return pd_is_supported();
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109 }
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110
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111 #else // HAVE_DTRACE_H
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112
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113 jlong DTraceJSDT::activate(
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114 jint version, jstring module_name, jint providers_count,
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115 JVM_DTraceProvider* providers, TRAPS) {
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116 return 0;
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117 }
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118
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119 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {
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120 return false;
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121 }
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122
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123 void DTraceJSDT::dispose(OpaqueProbes probes) {
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124 return;
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125 }
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126
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127 jboolean DTraceJSDT::is_supported() {
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128 return false;
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129 }
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130
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131 #endif // ndef HAVE_DTRACE_H