1 /*

     2  * Copyright (c) 2012, 2019, 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/dcmd/jfrDcmds.hpp"

    27 #include "jfr/recorder/jfrRecorder.hpp"

    28 #include "jfr/recorder/repository/jfrChunk.hpp"

    29 #include "jfr/recorder/repository/jfrChunkWriter.hpp"

    30 #include "jfr/utilities/jfrTimeConverter.hpp"

    31 #include "logging/log.hpp"

    32 #include "runtime/os.inline.hpp"

    33 #include "runtime/thread.inline.hpp"

    34 

    35 static const u1 GUARD = 0xff;

    36 

    37 static jlong nanos_now() {

    38   return os::javaTimeMillis() * JfrTimeConverter::NANOS_PER_MILLISEC;

    39 }

    40 

    41 static jlong ticks_now() {

    42   return JfrTicks::now();

    43 }

    44 

    45 JfrChunk::JfrChunk() :

    46   _path(NULL),

    47   _start_ticks(0),

    48   _previous_start_ticks(invalid_time),

    49   _start_nanos(0),

    50   _previous_start_nanos(invalid_time),

    51   _last_update_nanos(0),

    52   _last_checkpoint_offset(0),

    53   _last_metadata_offset(0),

    54   _generation(1) {}

    55 

    56 JfrChunk::~JfrChunk() {

    57   reset();

    58 }

    59 

    60 void JfrChunk::reset() {

    61   if (_path != NULL) {

    62     JfrCHeapObj::free(_path, strlen(_path) + 1);

    63     _path = NULL;

    64   }

    65   _last_checkpoint_offset = _last_metadata_offset = 0;

    66   _generation = 1;

    67 }

    68 

    69 void JfrChunk::set_last_checkpoint_offset(int64_t offset) {

    70   _last_checkpoint_offset = offset;

    71 }

    72 

    73 int64_t JfrChunk::last_checkpoint_offset() const {

    74   return _last_checkpoint_offset;

    75 }

    76 

    77 int64_t JfrChunk::start_ticks() const {

    78   assert(_start_ticks != 0, "invariant");

    79   return _start_ticks;

    80 }

    81 

    82 int64_t JfrChunk::start_nanos() const {

    83   assert(_start_nanos != 0, "invariant");

    84   return _start_nanos;

    85 }

    86 

    87 int64_t JfrChunk::previous_start_ticks() const {

    88   assert(_previous_start_ticks != invalid_time, "invariant");

    89   return _previous_start_ticks;

    90 }

    91 

    92 int64_t JfrChunk::previous_start_nanos() const {

    93   assert(_previous_start_nanos != invalid_time, "invariant");

    94   return _previous_start_nanos;

    95 }

    96 

    97 void JfrChunk::update_start_ticks() {

    98   _start_ticks = ticks_now();

    99 }

   100 

   101 void JfrChunk::update_start_nanos() {

   102   _start_nanos = _last_update_nanos = nanos_now();

   103 }

   104 

   105 void JfrChunk::update() {

   106   _last_update_nanos = nanos_now();

   107 }

   108 

   109 void JfrChunk::save_current_and_update_start_ticks() {

   110   _previous_start_ticks = _start_ticks;

   111   update_start_ticks();

   112 }

   113 

   114 void JfrChunk::save_current_and_update_start_nanos() {

   115   _previous_start_nanos = _start_nanos;

   116   update_start_nanos();

   117 }

   118 

   119 void JfrChunk::update_time_to_now() {

   120   save_current_and_update_start_nanos();

   121   save_current_and_update_start_ticks();

   122 }

   123 

   124 int64_t JfrChunk::last_chunk_duration() const {

   125   assert(_previous_start_nanos != invalid_time, "invariant");

   126   return _start_nanos - _previous_start_nanos;

   127 }

   128 

   129 static char* copy_path(const char* path) {

   130   assert(path != NULL, "invariant");

   131   const size_t path_len = strlen(path);

   132   char* new_path = JfrCHeapObj::new_array<char>(path_len + 1);

   133   strncpy(new_path, path, path_len + 1);

   134   return new_path;

   135 }

   136 

   137 void JfrChunk::set_path(const char* path) {

   138   if (_path != NULL) {

   139     JfrCHeapObj::free(_path, strlen(_path) + 1);

   140     _path = NULL;

   141   }

   142   if (path != NULL) {

   143     _path = copy_path(path);

   144   }

   145 }

   146 

   147 const char* JfrChunk::path() const {

   148   return _path;

   149 }

   150 

   151 bool JfrChunk::is_started() const {

   152   return _start_nanos != 0;

   153 }

   154 

   155 bool JfrChunk::is_finished() const {

   156   return 0 == _generation;

   157 }

   158 

   159 bool JfrChunk::is_initial_flush() const {

   160   return 0 == _last_metadata_offset;

   161 }

   162 

   163 int64_t JfrChunk::duration() const {

   164   assert(_last_update_nanos >= _start_nanos, "invariant");

   165   return _last_update_nanos - _start_nanos;

   166 }

   167 

   168 int64_t JfrChunk::last_metadata_offset() const {

   169   return _last_metadata_offset;

   170 }

   171 

   172 void JfrChunk::set_last_metadata_offset(int64_t offset) {

   173   if (0 == offset) {

   174     return;

   175   }

   176   assert(offset > _last_metadata_offset, "invariant");

   177   _last_metadata_offset = offset;

   178 }

   179 

   180 bool JfrChunk::has_metadata() const {

   181   return 0 != _last_metadata_offset;

   182 }

   183 

   184 u1 JfrChunk::generation() const {

   185   assert(_generation > 0, "invariant");

   186   const u1 this_generation = _generation++;

   187   if (GUARD == _generation) {

   188     _generation = 1;

   189   }

   190   return this_generation;

   191 }

   192