1 /*
2 * Copyright (c) 2012, 2020, 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 */
24
25 #include "precompiled.hpp"
26 #include "jfr/recorder/repository/jfrChunk.hpp"
27 #include "jfr/recorder/service/jfrOptionSet.hpp"
28 #include "jfr/utilities/jfrTime.hpp"
29 #include "jfr/utilities/jfrTimeConverter.hpp"
30 #include "jfr/utilities/jfrTypes.hpp"
31 #include "runtime/os.inline.hpp"
32
33 static const char* const MAGIC = "FLR";
34 static const u2 JFR_VERSION_MAJOR = 2;
35 static const u2 JFR_VERSION_MINOR = 1;
36
37 // strictly monotone
nanos_now()38 static jlong nanos_now() {
39 static jlong last = 0;
40 // We use javaTimeMillis so this can be correlated with
41 // external timestamps.
42 const jlong now = os::javaTimeMillis() * JfrTimeConverter::NANOS_PER_MILLISEC;
43 if (now > last) {
44 last = now;
45 } else {
46 ++last;
47 }
48 return last;
49 }
50
ticks_now()51 static jlong ticks_now() {
52 return JfrTicks::now();
53 }
54
JfrChunk()55 JfrChunk::JfrChunk() :
56 _path(NULL),
57 _start_ticks(0),
58 _previous_start_ticks(invalid_time),
59 _start_nanos(0),
60 _previous_start_nanos(invalid_time),
61 _last_update_nanos(0),
62 _last_checkpoint_offset(0),
63 _last_metadata_offset(0),
64 _generation(1),
65 _final(false) {}
66
~JfrChunk()67 JfrChunk::~JfrChunk() {
68 reset();
69 }
70
reset()71 void JfrChunk::reset() {
72 if (_path != NULL) {
73 JfrCHeapObj::free(_path, strlen(_path) + 1);
74 _path = NULL;
75 }
76 _last_checkpoint_offset = _last_metadata_offset = 0;
77 _generation = 1;
78 }
79
magic() const80 const char* JfrChunk::magic() const {
81 return MAGIC;
82 }
83
major_version() const84 u2 JfrChunk::major_version() const {
85 return JFR_VERSION_MAJOR;
86 }
87
minor_version() const88 u2 JfrChunk::minor_version() const {
89 return JFR_VERSION_MINOR;
90 }
91
mark_final()92 void JfrChunk::mark_final() {
93 _final = true;
94 }
95
flags() const96 u2 JfrChunk::flags() const {
97 // chunk capabilities, CompressedIntegers etc
98 u2 flags = 0;
99 if (JfrOptionSet::compressed_integers()) {
100 flags |= 1 << 0;
101 }
102 if (_final) {
103 flags |= 1 << 1;
104 }
105 return flags;
106 }
107
cpu_frequency() const108 int64_t JfrChunk::cpu_frequency() const {
109 static const jlong frequency = JfrTime::frequency();
110 return frequency;
111 }
112
set_last_checkpoint_offset(int64_t offset)113 void JfrChunk::set_last_checkpoint_offset(int64_t offset) {
114 _last_checkpoint_offset = offset;
115 }
116
last_checkpoint_offset() const117 int64_t JfrChunk::last_checkpoint_offset() const {
118 return _last_checkpoint_offset;
119 }
120
start_ticks() const121 int64_t JfrChunk::start_ticks() const {
122 assert(_start_ticks != 0, "invariant");
123 return _start_ticks;
124 }
125
start_nanos() const126 int64_t JfrChunk::start_nanos() const {
127 assert(_start_nanos != 0, "invariant");
128 return _start_nanos;
129 }
130
previous_start_ticks() const131 int64_t JfrChunk::previous_start_ticks() const {
132 assert(_previous_start_ticks != invalid_time, "invariant");
133 return _previous_start_ticks;
134 }
135
previous_start_nanos() const136 int64_t JfrChunk::previous_start_nanos() const {
137 assert(_previous_start_nanos != invalid_time, "invariant");
138 return _previous_start_nanos;
139 }
140
update_start_ticks()141 void JfrChunk::update_start_ticks() {
142 _start_ticks = ticks_now();
143 }
144
update_start_nanos()145 void JfrChunk::update_start_nanos() {
146 const jlong now = nanos_now();
147 assert(now > _start_nanos, "invariant");
148 assert(now > _last_update_nanos, "invariant");
149 _start_nanos = _last_update_nanos = now;
150 }
151
update_current_nanos()152 void JfrChunk::update_current_nanos() {
153 const jlong now = nanos_now();
154 assert(now > _last_update_nanos, "invariant");
155 _last_update_nanos = now;
156 }
157
save_current_and_update_start_ticks()158 void JfrChunk::save_current_and_update_start_ticks() {
159 _previous_start_ticks = _start_ticks;
160 update_start_ticks();
161 }
162
save_current_and_update_start_nanos()163 void JfrChunk::save_current_and_update_start_nanos() {
164 _previous_start_nanos = _start_nanos;
165 update_start_nanos();
166 }
167
set_time_stamp()168 void JfrChunk::set_time_stamp() {
169 save_current_and_update_start_nanos();
170 save_current_and_update_start_ticks();
171 }
172
last_chunk_duration() const173 int64_t JfrChunk::last_chunk_duration() const {
174 assert(_previous_start_nanos != invalid_time, "invariant");
175 return _start_nanos - _previous_start_nanos;
176 }
177
copy_path(const char * path)178 static char* copy_path(const char* path) {
179 assert(path != NULL, "invariant");
180 const size_t path_len = strlen(path);
181 char* new_path = JfrCHeapObj::new_array<char>(path_len + 1);
182 strncpy(new_path, path, path_len + 1);
183 return new_path;
184 }
185
set_path(const char * path)186 void JfrChunk::set_path(const char* path) {
187 if (_path != NULL) {
188 JfrCHeapObj::free(_path, strlen(_path) + 1);
189 _path = NULL;
190 }
191 if (path != NULL) {
192 _path = copy_path(path);
193 }
194 }
195
path() const196 const char* JfrChunk::path() const {
197 return _path;
198 }
199
is_started() const200 bool JfrChunk::is_started() const {
201 return _start_nanos != 0;
202 }
203
is_finished() const204 bool JfrChunk::is_finished() const {
205 return 0 == _generation;
206 }
207
duration() const208 int64_t JfrChunk::duration() const {
209 assert(_last_update_nanos >= _start_nanos, "invariant");
210 return _last_update_nanos - _start_nanos;
211 }
212
last_metadata_offset() const213 int64_t JfrChunk::last_metadata_offset() const {
214 return _last_metadata_offset;
215 }
216
set_last_metadata_offset(int64_t offset)217 void JfrChunk::set_last_metadata_offset(int64_t offset) {
218 assert(offset > _last_metadata_offset, "invariant");
219 _last_metadata_offset = offset;
220 }
221
has_metadata() const222 bool JfrChunk::has_metadata() const {
223 return 0 != _last_metadata_offset;
224 }
225
generation() const226 u1 JfrChunk::generation() const {
227 assert(_generation > 0, "invariant");
228 const u1 this_generation = _generation++;
229 if (GUARD == _generation) {
230 _generation = 1;
231 }
232 return this_generation;
233 }
234
next_generation() const235 u1 JfrChunk::next_generation() const {
236 assert(_generation > 0, "invariant");
237 const u1 next_gen = _generation;
238 return GUARD == next_gen ? 1 : next_gen;
239 }
240