The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file daemon/init.c |
| 3 | * Daemon set up and main loop for 2.6 |
| 4 | * |
| 5 | * @remark Copyright 2002 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | * @Modifications Daniel Hansel |
| 11 | * Modified by Aravind Menon for Xen |
| 12 | * These modifications are: |
| 13 | * Copyright (C) 2005 Hewlett-Packard Co. |
| 14 | */ |
| 15 | |
| 16 | #include "config.h" |
| 17 | |
| 18 | #include "oprofiled.h" |
| 19 | #include "opd_stats.h" |
| 20 | #include "opd_sfile.h" |
| 21 | #include "opd_pipe.h" |
| 22 | #include "opd_kernel.h" |
| 23 | #include "opd_trans.h" |
| 24 | #include "opd_anon.h" |
| 25 | #include "opd_perfmon.h" |
| 26 | #include "opd_printf.h" |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame^] | 27 | #include "opd_extended.h" |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 28 | |
| 29 | #include "op_version.h" |
| 30 | #include "op_config.h" |
| 31 | #include "op_deviceio.h" |
| 32 | #include "op_get_time.h" |
| 33 | #include "op_libiberty.h" |
| 34 | #include "op_fileio.h" |
| 35 | |
| 36 | #include <fcntl.h> |
| 37 | #include <stdio.h> |
| 38 | #include <errno.h> |
| 39 | #include <limits.h> |
| 40 | #include <stdlib.h> |
| 41 | #include <sys/time.h> |
| 42 | #if ANDROID |
| 43 | #include <sys/wait.h> |
| 44 | #else |
| 45 | #include <wait.h> |
| 46 | #endif |
| 47 | #include <string.h> |
| 48 | |
| 49 | size_t kernel_pointer_size; |
| 50 | |
| 51 | static fd_t devfd; |
| 52 | static char * sbuf; |
| 53 | static size_t s_buf_bytesize; |
| 54 | extern char * session_dir; |
| 55 | static char start_time_str[32]; |
| 56 | static int jit_conversion_running; |
| 57 | |
| 58 | static void opd_sighup(void); |
| 59 | static void opd_alarm(void); |
| 60 | static void opd_sigterm(void); |
| 61 | static void opd_sigchild(void); |
| 62 | static void opd_do_jitdumps(void); |
| 63 | |
| 64 | /** |
| 65 | * opd_open_files - open necessary files |
| 66 | * |
| 67 | * Open the device files and the log file, |
| 68 | * and mmap() the hash map. |
| 69 | */ |
| 70 | static void opd_open_files(void) |
| 71 | { |
| 72 | devfd = op_open_device("/dev/oprofile/buffer"); |
| 73 | if (devfd == -1) { |
| 74 | if (errno == EINVAL) |
| 75 | fprintf(stderr, "Failed to open device. Possibly you have passed incorrect\n" |
| 76 | "parameters. Check /var/log/messages."); |
| 77 | else |
| 78 | perror("Failed to open profile device"); |
| 79 | exit(EXIT_FAILURE); |
| 80 | } |
| 81 | |
| 82 | /* give output before re-opening stdout as the logfile */ |
| 83 | printf("Using log file %s\n", op_log_file); |
| 84 | |
| 85 | /* set up logfile */ |
| 86 | close(0); |
| 87 | close(1); |
| 88 | |
| 89 | if (open("/dev/null", O_RDONLY) == -1) { |
| 90 | perror("oprofiled: couldn't re-open stdin as /dev/null: "); |
| 91 | exit(EXIT_FAILURE); |
| 92 | } |
| 93 | |
| 94 | opd_open_logfile(); |
| 95 | opd_create_pipe(); |
| 96 | |
| 97 | printf("oprofiled started %s", op_get_time()); |
| 98 | printf("kernel pointer size: %lu\n", |
| 99 | (unsigned long)kernel_pointer_size); |
| 100 | fflush(stdout); |
| 101 | } |
| 102 | |
| 103 | |
| 104 | /** Done writing out the samples, indicate with complete_dump file */ |
| 105 | static void complete_dump(void) |
| 106 | { |
| 107 | FILE * status_file; |
| 108 | |
| 109 | retry: |
| 110 | status_file = fopen(op_dump_status, "w"); |
| 111 | |
| 112 | if (!status_file && errno == EMFILE) { |
| 113 | if (sfile_lru_clear()) { |
| 114 | printf("LRU cleared but file open fails for %s.\n", |
| 115 | op_dump_status); |
| 116 | abort(); |
| 117 | } |
| 118 | goto retry; |
| 119 | } |
| 120 | |
| 121 | if (!status_file) { |
| 122 | perror("warning: couldn't set complete_dump: "); |
| 123 | return; |
| 124 | } |
| 125 | |
| 126 | fprintf(status_file, "1\n"); |
| 127 | fclose(status_file); |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /** |
| 132 | * opd_do_samples - process a sample buffer |
| 133 | * @param opd_buf buffer to process |
| 134 | * |
| 135 | * Process a buffer of samples. |
| 136 | * |
| 137 | * If the sample could be processed correctly, it is written |
| 138 | * to the relevant sample file. |
| 139 | */ |
| 140 | static void opd_do_samples(char const * opd_buf, ssize_t count) |
| 141 | { |
| 142 | size_t num = count / kernel_pointer_size; |
| 143 | |
| 144 | opd_stats[OPD_DUMP_COUNT]++; |
| 145 | |
| 146 | verbprintf(vmisc, "Read buffer of %d entries.\n", (unsigned int)num); |
| 147 | |
| 148 | opd_process_samples(opd_buf, num); |
| 149 | |
| 150 | complete_dump(); |
| 151 | } |
| 152 | |
| 153 | static void opd_do_jitdumps(void) |
| 154 | { |
| 155 | pid_t childpid; |
| 156 | int arg_num; |
| 157 | unsigned long long end_time = 0ULL; |
| 158 | struct timeval tv; |
| 159 | char end_time_str[32]; |
| 160 | char opjitconv_path[PATH_MAX + 1]; |
| 161 | char * exec_args[6]; |
| 162 | |
| 163 | if (jit_conversion_running) |
| 164 | return; |
| 165 | jit_conversion_running = 1; |
| 166 | |
| 167 | childpid = fork(); |
| 168 | switch (childpid) { |
| 169 | case -1: |
| 170 | perror("Error forking JIT dump process!"); |
| 171 | break; |
| 172 | case 0: |
| 173 | gettimeofday(&tv, NULL); |
| 174 | end_time = tv.tv_sec; |
| 175 | sprintf(end_time_str, "%llu", end_time); |
| 176 | sprintf(opjitconv_path, "%s/%s", OP_BINDIR, "opjitconv"); |
| 177 | arg_num = 0; |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 178 | exec_args[arg_num++] = "opjitconv"; |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 179 | if (vmisc) |
| 180 | exec_args[arg_num++] = "-d"; |
| 181 | exec_args[arg_num++] = session_dir; |
| 182 | exec_args[arg_num++] = start_time_str; |
| 183 | exec_args[arg_num++] = end_time_str; |
| 184 | exec_args[arg_num] = (char *) NULL; |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 185 | execvp(opjitconv_path, exec_args); |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 186 | fprintf(stderr, "Failed to exec %s: %s\n", |
| 187 | exec_args[0], strerror(errno)); |
| 188 | /* We don't want any cleanup in the child */ |
| 189 | _exit(EXIT_FAILURE); |
| 190 | default: |
| 191 | break; |
| 192 | } |
| 193 | |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * opd_do_read - enter processing loop |
| 198 | * @param buf buffer to read into |
| 199 | * @param size size of buffer |
| 200 | * |
| 201 | * Read some of a buffer from the device and process |
| 202 | * the contents. |
| 203 | */ |
| 204 | static void opd_do_read(char * buf, size_t size) |
| 205 | { |
| 206 | opd_open_pipe(); |
| 207 | |
| 208 | while (1) { |
| 209 | ssize_t count = -1; |
| 210 | |
| 211 | /* loop to handle EINTR */ |
| 212 | while (count < 0) { |
| 213 | count = op_read_device(devfd, buf, size); |
| 214 | |
| 215 | /* we can lose an alarm or a hup but |
| 216 | * we don't care. |
| 217 | */ |
| 218 | if (signal_alarm) { |
| 219 | signal_alarm = 0; |
| 220 | opd_alarm(); |
| 221 | } |
| 222 | |
| 223 | if (signal_hup) { |
| 224 | signal_hup = 0; |
| 225 | opd_sighup(); |
| 226 | } |
| 227 | |
| 228 | if (signal_term) |
| 229 | opd_sigterm(); |
| 230 | |
| 231 | if (signal_child) |
| 232 | opd_sigchild(); |
| 233 | |
| 234 | if (signal_usr1) { |
| 235 | signal_usr1 = 0; |
| 236 | perfmon_start(); |
| 237 | } |
| 238 | |
| 239 | if (signal_usr2) { |
| 240 | signal_usr2 = 0; |
| 241 | perfmon_stop(); |
| 242 | } |
| 243 | |
| 244 | if (is_jitconv_requested()) { |
| 245 | verbprintf(vmisc, "Start opjitconv was triggered\n"); |
| 246 | opd_do_jitdumps(); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | opd_do_samples(buf, count); |
| 251 | } |
| 252 | |
| 253 | opd_close_pipe(); |
| 254 | } |
| 255 | |
| 256 | |
| 257 | /** opd_alarm - sync files and report stats */ |
| 258 | static void opd_alarm(void) |
| 259 | { |
| 260 | sfile_sync_files(); |
| 261 | opd_print_stats(); |
| 262 | alarm(60 * 10); |
| 263 | } |
| 264 | |
| 265 | |
| 266 | /** re-open files for logrotate/opcontrol --reset */ |
| 267 | static void opd_sighup(void) |
| 268 | { |
| 269 | printf("Received SIGHUP.\n"); |
| 270 | /* We just close them, and re-open them lazily as usual. */ |
| 271 | sfile_close_files(); |
| 272 | close(1); |
| 273 | close(2); |
| 274 | opd_open_logfile(); |
| 275 | } |
| 276 | |
| 277 | |
| 278 | static void clean_exit(void) |
| 279 | { |
| 280 | perfmon_exit(); |
| 281 | unlink(op_lock_file); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | static void opd_sigterm(void) |
| 286 | { |
| 287 | opd_do_jitdumps(); |
| 288 | opd_print_stats(); |
| 289 | printf("oprofiled stopped %s", op_get_time()); |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame^] | 290 | opd_ext_deinitialize(); |
| 291 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 292 | exit(EXIT_FAILURE); |
| 293 | } |
| 294 | |
| 295 | /* SIGCHLD received from JIT dump child process. */ |
| 296 | static void opd_sigchild(void) |
| 297 | { |
| 298 | int child_status; |
| 299 | wait(&child_status); |
| 300 | jit_conversion_running = 0; |
| 301 | if (WIFEXITED(child_status) && (!WEXITSTATUS(child_status))) { |
| 302 | verbprintf(vmisc, "JIT dump processing complete.\n"); |
| 303 | } else { |
| 304 | printf("JIT dump processing exited abnormally: %d\n", |
| 305 | WEXITSTATUS(child_status)); |
| 306 | } |
| 307 | |
| 308 | } |
| 309 | |
| 310 | static void opd_26_init(void) |
| 311 | { |
| 312 | size_t i; |
| 313 | size_t opd_buf_size; |
| 314 | unsigned long long start_time = 0ULL; |
| 315 | struct timeval tv; |
| 316 | |
| 317 | opd_create_vmlinux(vmlinux, kernel_range); |
| 318 | opd_create_xen(xenimage, xen_range); |
| 319 | |
| 320 | opd_buf_size = opd_read_fs_int("/dev/oprofile/", "buffer_size", 1); |
| 321 | kernel_pointer_size = opd_read_fs_int("/dev/oprofile/", "pointer_size", 1); |
| 322 | |
| 323 | s_buf_bytesize = opd_buf_size * kernel_pointer_size; |
| 324 | |
| 325 | sbuf = xmalloc(s_buf_bytesize); |
| 326 | |
| 327 | opd_reread_module_info(); |
| 328 | |
| 329 | for (i = 0; i < OPD_MAX_STATS; i++) |
| 330 | opd_stats[i] = 0; |
| 331 | |
| 332 | perfmon_init(); |
| 333 | |
| 334 | cookie_init(); |
| 335 | sfile_init(); |
| 336 | anon_init(); |
| 337 | |
| 338 | /* must be /after/ perfmon_init() at least */ |
| 339 | if (atexit(clean_exit)) { |
| 340 | perfmon_exit(); |
| 341 | perror("oprofiled: couldn't set exit cleanup: "); |
| 342 | exit(EXIT_FAILURE); |
| 343 | } |
| 344 | |
| 345 | /* trigger kernel module setup before returning control to opcontrol */ |
| 346 | opd_open_files(); |
| 347 | gettimeofday(&tv, NULL); |
| 348 | start_time = 0ULL; |
| 349 | start_time = tv.tv_sec; |
| 350 | sprintf(start_time_str, "%llu", start_time); |
| 351 | |
| 352 | } |
| 353 | |
| 354 | |
| 355 | static void opd_26_start(void) |
| 356 | { |
| 357 | /* simple sleep-then-process loop */ |
| 358 | opd_do_read(sbuf, s_buf_bytesize); |
| 359 | } |
| 360 | |
| 361 | |
| 362 | static void opd_26_exit(void) |
| 363 | { |
| 364 | opd_print_stats(); |
| 365 | printf("oprofiled stopped %s", op_get_time()); |
| 366 | |
| 367 | free(sbuf); |
| 368 | free(vmlinux); |
| 369 | /* FIXME: free kernel images, sfiles etc. */ |
| 370 | } |
| 371 | |
| 372 | struct oprofiled_ops opd_26_ops = { |
| 373 | .init = opd_26_init, |
| 374 | .start = opd_26_start, |
| 375 | .exit = opd_26_exit, |
| 376 | }; |