1 /* 2 * Copyright (c) 2015, The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google, Inc. nor the names of its contributors 15 * may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <binder/IBinder.h> 33 #include <binder/IServiceManager.h> 34 #include <binder/Parcel.h> 35 36 #include <ctime> 37 #include <cutils/properties.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 #include <sys/resource.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/types.h> 47 #include <unistd.h> 48 49 #include <utils/Log.h> 50 #include <utils/String8.h> 51 #include <utils/Trace.h> 52 #include <zlib.h> 53 54 using namespace android; 55 56 #ifdef LOG_TAG 57 #undef LOG_TAG 58 #endif 59 60 #define LOG_TAG "anrdaemon" 61 62 static const int check_period = 1; // in sec 63 static const int tracing_check_period = 500000; // in micro sec 64 static const int cpu_stat_entries = 7; // number of cpu stat entries 65 static const int min_buffer_size = 16; 66 static const int max_buffer_size = 2048; 67 static const char *min_buffer_size_str = "16"; 68 static const char *max_buffer_size_str = "2048"; 69 static const int time_buf_size = 20; 70 static const int path_buf_size = 60; 71 72 typedef struct cpu_stat { 73 unsigned long utime, ntime, stime, itime; 74 unsigned long iowtime, irqtime, sirqtime, steal; 75 unsigned long total; 76 } cpu_stat_t; 77 78 /* 79 * Logging on/off threshold. 80 * Uint: 0.01%; default to 99.90% cpu. 81 */ 82 static int idle_threshold = 10; 83 84 static bool quit = false; 85 static bool suspend= false; 86 static bool dump_requested = false; 87 static bool err = false; 88 static char err_msg[100]; 89 static bool tracing = false; 90 91 static const char *buf_size_kb = "2048"; 92 static const char *apps = ""; 93 static uint64_t tag = 0; 94 95 static cpu_stat_t new_cpu; 96 static cpu_stat_t old_cpu; 97 98 /* Log certain kernel activity when enabled */ 99 static bool log_sched = false; 100 static bool log_stack = false; 101 static bool log_irq = false; 102 static bool log_sync = false; 103 static bool log_workq = false; 104 105 /* Paths for debugfs controls*/ 106 static const char* dfs_trace_output_path = 107 "/d/tracing/trace"; 108 static const char* dfs_irq_path = 109 "/d/tracing/events/irq/enable"; 110 static const char* dfs_sync_path = 111 "/d/tracing/events/sync/enable"; 112 static const char* dfs_workq_path = 113 "/d/tracing/events/workqueue/enable"; 114 static const char* dfs_stack_path = 115 "/d/tracing/options/stacktrace"; 116 static const char* dfs_sched_switch_path = 117 "/d/tracing/events/sched/sched_switch/enable"; 118 static const char* dfs_sched_wakeup_path = 119 "/d/tracing/events/sched/sched_wakeup/enable"; 120 static const char* dfs_control_path = 121 "/d/tracing/tracing_on"; 122 static const char* dfs_buffer_size_path = 123 "/d/tracing/buffer_size_kb"; 124 static const char* dfs_tags_property = "debug.atrace.tags.enableflags"; 125 static const char* dfs_apps_property = "debug.atrace.app_cmdlines"; 126 127 /* 128 * Read accumulated cpu data from /proc/stat 129 */ 130 static void get_cpu_stat(cpu_stat_t *cpu) { 131 FILE *fp = NULL; 132 const char *params = "cpu %lu %lu %lu %lu %lu %lu %lu %*d %*d %*d\n"; 133 134 if ((fp = fopen("/proc/stat", "r")) == NULL) { 135 err = true; 136 snprintf(err_msg, sizeof(err_msg), "can't read from /proc/stat with errno %d", errno); 137 } else { 138 if (fscanf(fp, params, &cpu->utime, &cpu->ntime, 139 &cpu->stime, &cpu->itime, &cpu->iowtime, &cpu->irqtime, 140 &cpu->sirqtime) != cpu_stat_entries) { 141 /* 142 * If failed in getting status, new_cpu won't be updated and 143 * is_heavy_loaded() will return false. 144 */ 145 ALOGE("Error in getting cpu status. Skipping this check."); 146 fclose(fp); 147 return; 148 } 149 150 cpu->total = cpu->utime + cpu->ntime + cpu->stime + cpu->itime 151 + cpu->iowtime + cpu->irqtime + cpu->sirqtime; 152 153 fclose(fp); 154 } 155 } 156 157 /* 158 * Calculate cpu usage in the past interval. 159 * If tracing is on, increase the idle threshold by 1.00% so that we do not 160 * turn on and off tracing frequently when the cpu load is right close to 161 * threshold. 162 */ 163 static bool is_heavy_load(void) { 164 unsigned long diff_idle, diff_total; 165 int threshold = idle_threshold + (tracing?100:0); 166 get_cpu_stat(&new_cpu); 167 diff_idle = new_cpu.itime - old_cpu.itime; 168 diff_total = new_cpu.total - old_cpu.total; 169 old_cpu = new_cpu; 170 return (diff_idle * 10000 < diff_total * threshold); 171 } 172 173 /* 174 * Force the userland processes to refresh their property for logging. 175 */ 176 static void dfs_poke_binder(void) { 177 sp<IServiceManager> sm = defaultServiceManager(); 178 Vector<String16> services = sm->listServices(); 179 for (size_t i = 0; i < services.size(); i++) { 180 sp<IBinder> obj = sm->checkService(services[i]); 181 if (obj != NULL) { 182 Parcel data; 183 obj->transact(IBinder::SYSPROPS_TRANSACTION, data, NULL, 0); 184 } 185 } 186 } 187 188 /* 189 * Enable/disable a debugfs property by writing 0/1 to its path. 190 */ 191 static int dfs_enable(bool enable, const char* path) { 192 int fd = open(path, O_WRONLY); 193 if (fd == -1) { 194 err = true; 195 snprintf(err_msg, sizeof(err_msg), "Can't open %s. Error: %d", path, errno); 196 return -1; 197 } 198 const char* control = (enable?"1":"0"); 199 ssize_t len = strlen(control); 200 int max_try = 10; // Fail if write was interrupted for 10 times 201 while (write(fd, control, len) != len) { 202 if (errno == EINTR && max_try-- > 0) { 203 usleep(100); 204 continue; 205 } 206 207 err = true; 208 snprintf(err_msg, sizeof(err_msg), "Error %d in writing to %s.", errno, path); 209 } 210 close(fd); 211 return (err?-1:0); 212 } 213 214 /* 215 * Set the userland tracing properties. 216 */ 217 static void dfs_set_property(uint64_t mtag, const char* mapp, bool enable) { 218 char buf[64]; 219 snprintf(buf, sizeof(buf), "%#" PRIx64, mtag); 220 if (property_set(dfs_tags_property, buf) < 0) { 221 err = true; 222 snprintf(err_msg, sizeof(err_msg), "Failed to set debug tags system properties."); 223 } 224 225 if (strlen(mapp) > 0 226 && property_set(dfs_apps_property, mapp) < 0) { 227 err = true; 228 snprintf(err_msg, sizeof(err_msg), "Failed to set debug applications."); 229 } 230 231 if (log_sched) { 232 dfs_enable(enable, dfs_sched_switch_path); 233 dfs_enable(enable, dfs_sched_wakeup_path); 234 } 235 if (log_stack) { 236 dfs_enable(enable, dfs_stack_path); 237 } 238 if (log_irq) { 239 dfs_enable(enable, dfs_irq_path); 240 } 241 if (log_sync) { 242 dfs_enable(enable, dfs_sync_path); 243 } 244 if (log_workq) { 245 dfs_enable(enable, dfs_workq_path); 246 } 247 } 248 249 /* 250 * Dump the log in a compressed format for systrace to visualize. 251 * Create a dump file "dump_of_anrdaemon.<current_time>" under /data/misc/anrd 252 */ 253 static void dump_trace() 254 { 255 time_t now = time(0); 256 struct tm tstruct; 257 char time_buf[time_buf_size]; 258 char path_buf[path_buf_size]; 259 const char* header = " done\nTRACE:\n"; 260 ssize_t header_len = strlen(header); 261 262 ALOGI("Started to dump ANRdaemon trace."); 263 264 tstruct = *localtime(&now); 265 strftime(time_buf, time_buf_size, "%Y-%m-%d.%X", &tstruct); 266 snprintf(path_buf, path_buf_size, "/data/misc/anrd/dump_of_anrdaemon.%s", time_buf); 267 int output_fd = creat(path_buf, S_IRWXU); 268 if (output_fd == -1) { 269 ALOGE("Failed to create %s. Dump aborted.", path_buf); 270 return; 271 } 272 273 if (write(output_fd, header, strlen(header)) != header_len) { 274 ALOGE("Failed to write the header."); 275 close(output_fd); 276 return; 277 } 278 279 int trace_fd = open(dfs_trace_output_path, O_RDWR); 280 if (trace_fd == -1) { 281 ALOGE("Failed to open %s. Dump aborted.", dfs_trace_output_path); 282 close(output_fd); 283 return; 284 } 285 286 z_stream zs; 287 uint8_t *in, *out; 288 int result, flush; 289 290 memset(&zs, 0, sizeof(zs)); 291 result = deflateInit(&zs, Z_DEFAULT_COMPRESSION); 292 if (result != Z_OK) { 293 ALOGE("error initializing zlib: %d\n", result); 294 close(trace_fd); 295 close(output_fd); 296 return; 297 } 298 299 const size_t bufSize = 64*1024; 300 in = (uint8_t*)malloc(bufSize); 301 out = (uint8_t*)malloc(bufSize); 302 flush = Z_NO_FLUSH; 303 304 zs.next_out = out; 305 zs.avail_out = bufSize; 306 307 do { 308 if (zs.avail_in == 0) { 309 result = read(trace_fd, in, bufSize); 310 if (result < 0) { 311 ALOGE("error reading trace: %s", strerror(errno)); 312 result = Z_STREAM_END; 313 break; 314 } else if (result == 0) { 315 flush = Z_FINISH; 316 } else { 317 zs.next_in = in; 318 zs.avail_in = result; 319 } 320 } 321 322 if (zs.avail_out == 0) { 323 result = write(output_fd, out, bufSize); 324 if ((size_t)result < bufSize) { 325 ALOGE("error writing deflated trace: %s", strerror(errno)); 326 result = Z_STREAM_END; 327 zs.avail_out = bufSize; 328 break; 329 } 330 zs.next_out = out; 331 zs.avail_out = bufSize; 332 } 333 334 } while ((result = deflate(&zs, flush)) == Z_OK); 335 336 if (result != Z_STREAM_END) { 337 ALOGE("error deflating trace: %s\n", zs.msg); 338 } 339 340 if (zs.avail_out < bufSize) { 341 size_t bytes = bufSize - zs.avail_out; 342 result = write(output_fd, out, bytes); 343 if ((size_t)result < bytes) { 344 ALOGE("error writing deflated trace: %s", strerror(errno)); 345 } 346 } 347 348 result = deflateEnd(&zs); 349 if (result != Z_OK) { 350 ALOGE("error cleaning up zlib: %d\n", result); 351 } 352 353 free(in); 354 free(out); 355 356 close(trace_fd); 357 close(output_fd); 358 359 ALOGI("Finished dump. Output file stored at: %s", path_buf); 360 } 361 362 /* 363 * Start logging when cpu usage is high. Meanwhile, moniter the cpu usage and 364 * stop logging when it drops down. 365 */ 366 static void start_tracing(void) { 367 ALOGD("High cpu usage, start logging."); 368 369 if (dfs_enable(true, dfs_control_path) != 0) { 370 ALOGE("Failed to start tracing."); 371 return; 372 } 373 tracing = true; 374 375 /* Stop logging when cpu usage drops or the daemon is suspended.*/ 376 do { 377 usleep(tracing_check_period); 378 } while (!suspend && !dump_requested && is_heavy_load()); 379 380 if (dfs_enable(false, dfs_control_path) != 0) { 381 ALOGE("Failed to stop tracing."); 382 err = true; 383 return; 384 } 385 tracing = false; 386 387 if (suspend) { 388 ALOGI("trace stopped due to suspend. Send SIGCONT to resume."); 389 } else if (dump_requested) { 390 ALOGI("trace stopped due to dump request."); 391 dump_trace(); 392 dump_requested = false; 393 } else { 394 ALOGD("Usage back to low, stop logging."); 395 } 396 } 397 398 /* 399 * Set the tracing log buffer size. 400 * Note the actual buffer size will be buf_size_kb * number of cores. 401 */ 402 static int set_tracing_buffer_size(void) { 403 int fd = open(dfs_buffer_size_path, O_WRONLY); 404 if (fd == -1) { 405 err = true; 406 snprintf(err_msg, sizeof(err_msg), "Can't open atrace buffer size file under /d/tracing."); 407 return -1; 408 } 409 ssize_t len = strlen(buf_size_kb); 410 if (write(fd, buf_size_kb, len) != len) { 411 err = true; 412 snprintf(err_msg, sizeof(err_msg), "Error in writing to atrace buffer size file."); 413 } 414 close(fd); 415 return (err?-1:0); 416 417 } 418 419 /* 420 * Main loop to moniter the cpu usage and decided whether to start logging. 421 */ 422 static void start(void) { 423 if ((set_tracing_buffer_size()) != 0) 424 return; 425 426 dfs_set_property(tag, apps, true); 427 dfs_poke_binder(); 428 429 get_cpu_stat(&old_cpu); 430 sleep(check_period); 431 432 while (!quit && !err) { 433 if (!suspend && is_heavy_load()) { 434 /* 435 * Increase process priority to make sure we can stop logging when 436 * necessary and do not overwrite the buffer 437 */ 438 setpriority(PRIO_PROCESS, 0, -20); 439 start_tracing(); 440 setpriority(PRIO_PROCESS, 0, 0); 441 } 442 sleep(check_period); 443 } 444 return; 445 } 446 447 /* 448 * If trace is not running, dump trace right away. 449 * If trace is running, request to dump trace. 450 */ 451 static void request_dump_trace() 452 { 453 if (!tracing) { 454 dump_trace(); 455 } else if (!dump_requested) { 456 dump_requested = true; 457 } 458 } 459 460 static void handle_signal(int signo) 461 { 462 switch (signo) { 463 case SIGQUIT: 464 suspend = true; 465 quit = true; 466 break; 467 case SIGSTOP: 468 suspend = true; 469 break; 470 case SIGCONT: 471 suspend = false; 472 break; 473 case SIGUSR1: 474 request_dump_trace(); 475 } 476 } 477 478 /* 479 * Set the signal handler: 480 * SIGQUIT: Reset debugfs and tracing property and terminate the daemon. 481 * SIGSTOP: Stop logging and suspend the daemon. 482 * SIGCONT: Resume the daemon as normal. 483 * SIGUSR1: Dump the logging to a compressed format for systrace to visualize. 484 */ 485 static void register_sighandler(void) 486 { 487 struct sigaction sa; 488 sigset_t block_mask; 489 490 sigemptyset(&block_mask); 491 sigaddset (&block_mask, SIGQUIT); 492 sigaddset (&block_mask, SIGSTOP); 493 sigaddset (&block_mask, SIGCONT); 494 sigaddset (&block_mask, SIGUSR1); 495 496 sa.sa_flags = 0; 497 sa.sa_mask = block_mask; 498 sa.sa_handler = handle_signal; 499 sigaction(SIGQUIT, &sa, NULL); 500 sigaction(SIGSTOP, &sa, NULL); 501 sigaction(SIGCONT, &sa, NULL); 502 sigaction(SIGUSR1, &sa, NULL); 503 } 504 505 static void show_help(void) { 506 507 fprintf(stderr, "usage: ANRdaemon [options] [categoris...]\n"); 508 fprintf(stdout, "Options includes:\n" 509 " -a appname enable app-level tracing for a comma " 510 "separated list of cmdlines\n" 511 " -t N cpu threshold for logging to start " 512 "(uint = 0.01%%, min = 5000, max = 9999, default = 9990)\n" 513 " -s N use a trace buffer size of N KB " 514 "default to 2048KB\n" 515 " -h show helps\n"); 516 fprintf(stdout, "Categoris includes:\n" 517 " am - activity manager\n" 518 " sm - sync manager\n" 519 " input - input\n" 520 " dalvik - dalvik VM\n" 521 " audio - Audio\n" 522 " gfx - Graphics\n" 523 " rs - RenderScript\n" 524 " hal - Hardware Modules\n" 525 " irq - kernel irq events\n" 526 " sched - kernel scheduler activity\n" 527 " stack - kernel stack\n" 528 " sync - kernel sync activity\n" 529 " workq - kernel work queues\n"); 530 fprintf(stdout, "Control includes:\n" 531 " SIGQUIT: terminate the process\n" 532 " SIGSTOP: suspend all function of the daemon\n" 533 " SIGCONT: resume the normal function\n" 534 " SIGUSR1: dump the current logging in a compressed form\n"); 535 exit(0); 536 } 537 538 static int get_options(int argc, char *argv[]) { 539 int opt = 0; 540 int threshold; 541 while ((opt = getopt(argc, argv, "a:s:t:h")) >= 0) { 542 switch(opt) { 543 case 'a': 544 apps = optarg; 545 break; 546 case 's': 547 if (atoi(optarg) > max_buffer_size) 548 buf_size_kb = max_buffer_size_str; 549 else if (atoi(optarg) < min_buffer_size) 550 buf_size_kb = min_buffer_size_str; 551 else 552 buf_size_kb = optarg; 553 break; 554 case 't': 555 threshold = atoi(optarg); 556 if (threshold > 9999 || threshold < 5000) { 557 fprintf(stderr, "logging threshold should be 5000-9999\n"); 558 return 1; 559 } 560 idle_threshold = 10000 - threshold; 561 break; 562 case 'h': 563 show_help(); 564 break; 565 default: 566 fprintf(stderr, "Error in getting options.\n" 567 "run \"%s -h\" for usage.\n", argv[0]); 568 return 1; 569 } 570 } 571 572 for (int i = optind; i < argc; i++) { 573 if (strcmp(argv[i], "am") == 0) { 574 tag |= ATRACE_TAG_ACTIVITY_MANAGER; 575 } else if (strcmp(argv[i], "input") == 0) { 576 tag |= ATRACE_TAG_INPUT; 577 } else if (strcmp(argv[i], "sm") == 0) { 578 tag |= ATRACE_TAG_SYNC_MANAGER; 579 } else if (strcmp(argv[i], "dalvik") == 0) { 580 tag |= ATRACE_TAG_DALVIK; 581 } else if (strcmp(argv[i], "gfx") == 0) { 582 tag |= ATRACE_TAG_GRAPHICS; 583 } else if (strcmp(argv[i], "audio") == 0) { 584 tag |= ATRACE_TAG_AUDIO; 585 } else if (strcmp(argv[i], "hal") == 0) { 586 tag |= ATRACE_TAG_HAL; 587 } else if (strcmp(argv[i], "rs") == 0) { 588 tag |= ATRACE_TAG_RS; 589 } else if (strcmp(argv[i], "sched") == 0) { 590 log_sched = true; 591 } else if (strcmp(argv[i], "stack") == 0) { 592 log_stack = true; 593 } else if (strcmp(argv[i], "workq") == 0) { 594 log_workq = true; 595 } else if (strcmp(argv[i], "irq") == 0) { 596 log_irq = true; 597 } else if (strcmp(argv[i], "sync") == 0) { 598 log_sync = true; 599 } else { 600 fprintf(stderr, "invalid category: %s\n" 601 "run \"%s -h\" for usage.\n", argv[i], argv[0]); 602 return 1; 603 } 604 } 605 606 /* If nothing is enabled, don't run */ 607 if (!tag && !log_sched && !log_stack && !log_workq && !log_irq && !log_sync) { 608 ALOGE("Specify at least one category to trace."); 609 return 1; 610 } 611 612 return 0; 613 } 614 615 int main(int argc, char *argv[]) 616 { 617 if(get_options(argc, argv) != 0) 618 return 1; 619 620 if (daemon(0, 0) != 0) 621 return 1; 622 623 register_sighandler(); 624 625 /* Clear any the trace log file by overwrite it with a new file */ 626 int fd = creat(dfs_trace_output_path, 0); 627 if (fd == -1) { 628 ALOGE("Faield to open and cleaup previous log"); 629 return 1; 630 } 631 close(fd); 632 633 ALOGI("ANRdaemon starting"); 634 start(); 635 636 if (err) 637 ALOGE("ANRdaemon stopped due to Error: %s", err_msg); 638 639 ALOGI("ANRdaemon terminated."); 640 641 return (err?1:0); 642 } 643
