Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file daemon/liblegacy/init.c |
| 3 | * Daemon set up and main loop for 2.4 |
| 4 | * |
| 5 | * @remark Copyright 2002 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | */ |
| 11 | |
| 12 | #include "config.h" |
| 13 | |
| 14 | #include "opd_proc.h" |
| 15 | #include "opd_mapping.h" |
| 16 | #include "opd_24_stats.h" |
| 17 | #include "opd_sample_files.h" |
| 18 | #include "opd_image.h" |
| 19 | #include "opd_parse_proc.h" |
| 20 | #include "opd_kernel.h" |
| 21 | #include "opd_printf.h" |
| 22 | #include "oprofiled.h" |
| 23 | |
| 24 | #include "op_sample_file.h" |
| 25 | #include "op_config_24.h" |
| 26 | #include "op_interface.h" |
| 27 | #include "op_libiberty.h" |
| 28 | #include "op_deviceio.h" |
| 29 | #include "op_events.h" |
| 30 | #include "op_get_time.h" |
| 31 | #include "op_fileio.h" |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <errno.h> |
| 35 | #include <fcntl.h> |
| 36 | #include <unistd.h> |
| 37 | #include <stdlib.h> |
| 38 | |
| 39 | fd_t hashmapdevfd; |
| 40 | |
| 41 | int cpu_number; |
| 42 | |
| 43 | static fd_t devfd; |
| 44 | static fd_t notedevfd; |
| 45 | static struct op_buffer_head * sbuf; |
| 46 | static size_t s_buf_bytesize; |
| 47 | static struct op_note * nbuf; |
| 48 | static size_t n_buf_bytesize; |
| 49 | |
| 50 | static void opd_sighup(void); |
| 51 | static void opd_alarm(void); |
| 52 | static void opd_sigterm(void); |
| 53 | |
| 54 | |
| 55 | /** |
| 56 | * op_open_files - open necessary files |
| 57 | * |
| 58 | * Open the device files and the log file, |
| 59 | * and mmap() the hash map. |
| 60 | */ |
| 61 | static void op_open_files(void) |
| 62 | { |
| 63 | hashmapdevfd = op_open_device(op_hash_device); |
| 64 | if (hashmapdevfd == -1) { |
| 65 | perror("Failed to open hash map device"); |
| 66 | exit(EXIT_FAILURE); |
| 67 | } |
| 68 | |
| 69 | notedevfd = op_open_device(op_note_device); |
| 70 | if (notedevfd == -1) { |
| 71 | if (errno == EINVAL) |
| 72 | fprintf(stderr, "Failed to open note device. Possibly you have passed incorrect\n" |
| 73 | "parameters. Check /var/log/messages."); |
| 74 | else |
| 75 | perror("Failed to open note device"); |
| 76 | exit(EXIT_FAILURE); |
| 77 | } |
| 78 | |
| 79 | devfd = op_open_device(op_device); |
| 80 | if (devfd == -1) { |
| 81 | if (errno == EINVAL) |
| 82 | fprintf(stderr, "Failed to open device. Possibly you have passed incorrect\n" |
| 83 | "parameters. Check /var/log/messages."); |
| 84 | else |
| 85 | perror("Failed to open profile device"); |
| 86 | exit(EXIT_FAILURE); |
| 87 | } |
| 88 | |
| 89 | opd_init_hash_map(); |
| 90 | |
| 91 | /* give output before re-opening stdout as the logfile */ |
| 92 | printf("Using log file %s\n", op_log_file); |
| 93 | |
| 94 | /* set up logfile */ |
| 95 | close(0); |
| 96 | close(1); |
| 97 | |
| 98 | if (open("/dev/null", O_RDONLY) == -1) { |
| 99 | perror("oprofiled: couldn't re-open stdin as /dev/null: "); |
| 100 | exit(EXIT_FAILURE); |
| 101 | } |
| 102 | |
| 103 | opd_open_logfile(); |
| 104 | |
| 105 | printf("oprofiled started %s", op_get_time()); |
| 106 | fflush(stdout); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static void opd_do_samples(struct op_buffer_head const * buf); |
| 111 | static void opd_do_notes(struct op_note const * opd_buf, size_t count); |
| 112 | |
| 113 | /** |
| 114 | * do_shutdown - shutdown cleanly, reading as much remaining data as possible. |
| 115 | * @param buf sample buffer area |
| 116 | * @param size size of sample buffer |
| 117 | * @param nbuf note buffer area |
| 118 | * @param nsize size of note buffer |
| 119 | */ |
| 120 | static void opd_shutdown(struct op_buffer_head * buf, size_t size, struct op_note * nbuf, size_t nsize) |
| 121 | { |
| 122 | ssize_t count = -1; |
| 123 | ssize_t ncount = -1; |
| 124 | |
| 125 | /* the dump may have added no samples, so we must set |
| 126 | * non-blocking */ |
| 127 | if (fcntl(devfd, F_SETFL, fcntl(devfd, F_GETFL) | O_NONBLOCK) < 0) { |
| 128 | perror("Failed to set non-blocking read for device: "); |
| 129 | exit(EXIT_FAILURE); |
| 130 | } |
| 131 | |
| 132 | /* it's always OK to read the note device */ |
| 133 | while (ncount < 0) |
| 134 | ncount = op_read_device(notedevfd, nbuf, nsize); |
| 135 | |
| 136 | if (ncount > 0) |
| 137 | opd_do_notes(nbuf, ncount); |
| 138 | |
| 139 | /* read as much as we can until we have exhausted the data |
| 140 | * (EAGAIN is returned). |
| 141 | * |
| 142 | * This will not livelock as the profiler has been partially |
| 143 | * shut down by now. |
| 144 | */ |
| 145 | while (1) { |
| 146 | count = op_read_device(devfd, buf, size); |
| 147 | if (count < 0 && errno == EAGAIN) |
| 148 | break; |
| 149 | verbprintf(vmisc, "Shutting down, state %d\n", buf->state); |
| 150 | opd_do_samples(buf); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | |
| 155 | /** |
| 156 | * opd_do_read - enter processing loop |
| 157 | * @param buf buffer to read into |
| 158 | * @param size size of buffer |
| 159 | * @param nbuf note buffer |
| 160 | * @param nsize size of note buffer |
| 161 | * |
| 162 | * Read some of a buffer from the device and process |
| 163 | * the contents. |
| 164 | */ |
| 165 | static void opd_do_read(struct op_buffer_head * buf, size_t size, struct op_note * nbuf, size_t nsize) |
| 166 | { |
| 167 | while (1) { |
| 168 | ssize_t count = -1; |
| 169 | ssize_t ncount = -1; |
| 170 | |
| 171 | /* loop to handle EINTR */ |
| 172 | while (count < 0) |
| 173 | count = op_read_device(devfd, buf, size); |
| 174 | |
| 175 | while (ncount < 0) |
| 176 | ncount = op_read_device(notedevfd, nbuf, nsize); |
| 177 | |
| 178 | opd_do_notes(nbuf, ncount); |
| 179 | opd_do_samples(buf); |
| 180 | |
| 181 | // we can lost a signal alarm or a signal hup but we don't |
| 182 | // take care. |
| 183 | if (signal_alarm) { |
| 184 | signal_alarm = 0; |
| 185 | opd_alarm(); |
| 186 | } |
| 187 | |
| 188 | if (signal_hup) { |
| 189 | signal_hup = 0; |
| 190 | opd_sighup(); |
| 191 | } |
| 192 | |
| 193 | if (signal_term) |
| 194 | opd_sigterm(); |
| 195 | |
| 196 | /* request to stop arrived */ |
| 197 | if (buf->state == STOPPING) { |
| 198 | verbprintf(vmisc, "Shutting down by request.\n"); |
| 199 | opd_shutdown(buf, size, nbuf, nsize); |
| 200 | return; |
| 201 | } |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * opd_do_notes - process a notes buffer |
| 207 | * @param opd_buf buffer to process |
| 208 | * @param count number of bytes in buffer |
| 209 | * |
| 210 | * Process a buffer of notes. |
| 211 | */ |
| 212 | static void opd_do_notes(struct op_note const * opd_buf, size_t count) |
| 213 | { |
| 214 | uint i; |
| 215 | struct op_note const * note; |
| 216 | |
| 217 | for (i = 0; i < count/sizeof(struct op_note); i++) { |
| 218 | note = &opd_buf[i]; |
| 219 | |
| 220 | opd_24_stats[OPD_NOTIFICATIONS]++; |
| 221 | |
| 222 | switch (note->type) { |
| 223 | case OP_MAP: |
| 224 | case OP_EXEC: |
| 225 | if (note->type == OP_EXEC) |
| 226 | opd_handle_exec(note->pid, note->tgid); |
| 227 | opd_handle_mapping(note); |
| 228 | break; |
| 229 | |
| 230 | case OP_FORK: |
| 231 | opd_handle_fork(note); |
| 232 | break; |
| 233 | |
| 234 | case OP_DROP_MODULES: |
| 235 | opd_clear_module_info(); |
| 236 | break; |
| 237 | |
| 238 | case OP_EXIT: |
| 239 | opd_handle_exit(note); |
| 240 | break; |
| 241 | |
| 242 | default: |
| 243 | fprintf(stderr, "Received unknown notification type %u\n", note->type); |
| 244 | abort(); |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * opd_do_samples - process a sample buffer |
| 252 | * @param opd_buf buffer to process |
| 253 | * |
| 254 | * Process a buffer of samples. |
| 255 | * The signals specified by the global variable maskset are |
| 256 | * masked. |
| 257 | * |
| 258 | * If the sample could be processed correctly, it is written |
| 259 | * to the relevant sample file. Additionally mapping and |
| 260 | * process notifications are handled here. |
| 261 | */ |
| 262 | static void opd_do_samples(struct op_buffer_head const * opd_buf) |
| 263 | { |
| 264 | uint i; |
| 265 | struct op_sample const * buffer = opd_buf->buffer; |
| 266 | |
| 267 | opd_24_stats[OPD_DUMP_COUNT]++; |
| 268 | |
| 269 | verbprintf(vmisc, "Read buffer of %d entries for cpu %d.\n", |
| 270 | (unsigned int)opd_buf->count, opd_buf->cpu_nr); |
| 271 | |
| 272 | if (separate_cpu) |
| 273 | cpu_number = opd_buf->cpu_nr; |
| 274 | for (i = 0; i < opd_buf->count; i++) { |
| 275 | verbprintf(vsamples, "%.6u: EIP: 0x%.8lx pid: %.6d\n", |
| 276 | i, buffer[i].eip, buffer[i].pid); |
| 277 | opd_put_sample(&buffer[i]); |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | |
| 282 | /** |
| 283 | * opd_alarm - clean up old procs, msync, and report stats |
| 284 | */ |
| 285 | static void opd_alarm(void) |
| 286 | { |
| 287 | opd_sync_samples_files(); |
| 288 | |
| 289 | opd_age_procs(); |
| 290 | |
| 291 | opd_print_24_stats(); |
| 292 | |
| 293 | alarm(60 * 10); |
| 294 | } |
| 295 | |
| 296 | |
| 297 | /* re-open logfile for logrotate */ |
| 298 | static void opd_sighup(void) |
| 299 | { |
| 300 | printf("Received SIGHUP.\n"); |
| 301 | close(1); |
| 302 | close(2); |
| 303 | opd_open_logfile(); |
| 304 | /* We just close them, and re-open them lazily as usual. */ |
| 305 | opd_for_each_image(opd_close_image_samples_files); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | static void clean_exit(void) |
| 310 | { |
| 311 | opd_cleanup_hash_name(); |
| 312 | op_free_events(); |
| 313 | unlink(op_lock_file); |
| 314 | } |
| 315 | |
| 316 | |
| 317 | static void opd_sigterm(void) |
| 318 | { |
| 319 | opd_print_24_stats(); |
| 320 | printf("oprofiled stopped %s", op_get_time()); |
| 321 | exit(EXIT_FAILURE); |
| 322 | } |
| 323 | |
| 324 | |
| 325 | static void opd_24_init(void) |
| 326 | { |
| 327 | size_t i; |
| 328 | int opd_buf_size = OP_DEFAULT_BUF_SIZE; |
| 329 | int opd_note_buf_size = OP_DEFAULT_NOTE_SIZE; |
| 330 | |
| 331 | if (!no_vmlinux) |
| 332 | opd_parse_kernel_range(kernel_range); |
| 333 | opd_buf_size = opd_read_fs_int(OP_MOUNT, "bufsize", 1); |
| 334 | opd_note_buf_size = opd_read_fs_int(OP_MOUNT, "notesize", 1); |
| 335 | |
| 336 | s_buf_bytesize = sizeof(struct op_buffer_head) + opd_buf_size * sizeof(struct op_sample); |
| 337 | |
| 338 | sbuf = xmalloc(s_buf_bytesize); |
| 339 | |
| 340 | n_buf_bytesize = opd_note_buf_size * sizeof(struct op_note); |
| 341 | nbuf = xmalloc(n_buf_bytesize); |
| 342 | |
| 343 | opd_init_images(); |
| 344 | opd_init_procs(); |
| 345 | opd_init_kernel_image(); |
| 346 | |
| 347 | for (i = 0; i < OPD_MAX_STATS; i++) |
| 348 | opd_24_stats[i] = 0; |
| 349 | |
| 350 | if (atexit(clean_exit)) { |
| 351 | perror("oprofiled: couldn't set exit cleanup: "); |
| 352 | exit(EXIT_FAILURE); |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | |
| 357 | static void opd_24_start(void) |
| 358 | { |
| 359 | op_open_files(); |
| 360 | |
| 361 | /* yes, this is racey. */ |
| 362 | opd_get_ascii_procs(); |
| 363 | |
| 364 | /* simple sleep-then-process loop */ |
| 365 | opd_do_read(sbuf, s_buf_bytesize, nbuf, n_buf_bytesize); |
| 366 | } |
| 367 | |
| 368 | |
| 369 | static void opd_24_exit(void) |
| 370 | { |
| 371 | opd_print_24_stats(); |
| 372 | printf("oprofiled stopped %s", op_get_time()); |
| 373 | |
| 374 | free(sbuf); |
| 375 | free(nbuf); |
| 376 | opd_clear_module_info(); |
| 377 | opd_proc_cleanup(); |
| 378 | /* kernel/module image are not owned by a proc, we must cleanup them */ |
| 379 | opd_for_each_image(opd_delete_image); |
| 380 | } |
| 381 | |
| 382 | |
| 383 | struct oprofiled_ops opd_24_ops = { |
| 384 | .init = opd_24_init, |
| 385 | .start = opd_24_start, |
| 386 | .exit = opd_24_exit |
| 387 | }; |