atrace.cpp revision db40415e05e39c1f4faa62735f435b031e53af7c
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "atrace" 18 19#include <errno.h> 20#include <fcntl.h> 21#include <getopt.h> 22#include <inttypes.h> 23#include <signal.h> 24#include <stdarg.h> 25#include <stdbool.h> 26#include <stdio.h> 27#include <stdlib.h> 28#include <string.h> 29#include <sys/sendfile.h> 30#include <time.h> 31#include <unistd.h> 32#include <zlib.h> 33 34#include <binder/IBinder.h> 35#include <binder/IServiceManager.h> 36#include <binder/Parcel.h> 37 38#include <cutils/properties.h> 39 40#include <utils/String8.h> 41#include <utils/Timers.h> 42#include <utils/Tokenizer.h> 43#include <utils/Trace.h> 44 45using namespace android; 46 47#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0]))) 48 49#define MAX_SYS_FILES 10 50#define MAX_PACKAGES 16 51 52const char* k_traceTagsProperty = "debug.atrace.tags.enableflags"; 53 54const char* k_traceAppsNumberProperty = "debug.atrace.app_number"; 55const char* k_traceAppsPropertyTemplate = "debug.atrace.app_%d"; 56const char* k_coreServiceCategory = "core_services"; 57const char* k_coreServicesProp = "ro.atrace.core.services"; 58 59typedef enum { OPT, REQ } requiredness ; 60 61struct TracingCategory { 62 // The name identifying the category. 63 const char* name; 64 65 // A longer description of the category. 66 const char* longname; 67 68 // The userland tracing tags that the category enables. 69 uint64_t tags; 70 71 // The fname==NULL terminated list of /sys/ files that the category 72 // enables. 73 struct { 74 // Whether the file must be writable in order to enable the tracing 75 // category. 76 requiredness required; 77 78 // The path to the enable file. 79 const char* path; 80 } sysfiles[MAX_SYS_FILES]; 81}; 82 83/* Tracing categories */ 84static const TracingCategory k_categories[] = { 85 { "gfx", "Graphics", ATRACE_TAG_GRAPHICS, { } }, 86 { "input", "Input", ATRACE_TAG_INPUT, { } }, 87 { "view", "View System", ATRACE_TAG_VIEW, { } }, 88 { "webview", "WebView", ATRACE_TAG_WEBVIEW, { } }, 89 { "wm", "Window Manager", ATRACE_TAG_WINDOW_MANAGER, { } }, 90 { "am", "Activity Manager", ATRACE_TAG_ACTIVITY_MANAGER, { } }, 91 { "sm", "Sync Manager", ATRACE_TAG_SYNC_MANAGER, { } }, 92 { "audio", "Audio", ATRACE_TAG_AUDIO, { } }, 93 { "video", "Video", ATRACE_TAG_VIDEO, { } }, 94 { "camera", "Camera", ATRACE_TAG_CAMERA, { } }, 95 { "hal", "Hardware Modules", ATRACE_TAG_HAL, { } }, 96 { "app", "Application", ATRACE_TAG_APP, { } }, 97 { "res", "Resource Loading", ATRACE_TAG_RESOURCES, { } }, 98 { "dalvik", "Dalvik VM", ATRACE_TAG_DALVIK, { } }, 99 { "rs", "RenderScript", ATRACE_TAG_RS, { } }, 100 { "bionic", "Bionic C Library", ATRACE_TAG_BIONIC, { } }, 101 { "power", "Power Management", ATRACE_TAG_POWER, { } }, 102 { "pm", "Package Manager", ATRACE_TAG_PACKAGE_MANAGER, { } }, 103 { "ss", "System Server", ATRACE_TAG_SYSTEM_SERVER, { } }, 104 { "database", "Database", ATRACE_TAG_DATABASE, { } }, 105 { k_coreServiceCategory, "Core services", 0, { } }, 106 { "sched", "CPU Scheduling", 0, { 107 { REQ, "/sys/kernel/debug/tracing/events/sched/sched_switch/enable" }, 108 { REQ, "/sys/kernel/debug/tracing/events/sched/sched_wakeup/enable" }, 109 { OPT, "/sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable" }, 110 { OPT, "/sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable" }, 111 } }, 112 { "irq", "IRQ Events", 0, { 113 { REQ, "/sys/kernel/debug/tracing/events/irq/enable" }, 114 { OPT, "/sys/kernel/debug/tracing/events/ipi/enable" }, 115 } }, 116 { "freq", "CPU Frequency", 0, { 117 { REQ, "/sys/kernel/debug/tracing/events/power/cpu_frequency/enable" }, 118 { OPT, "/sys/kernel/debug/tracing/events/power/clock_set_rate/enable" }, 119 { OPT, "/sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable" }, 120 } }, 121 { "membus", "Memory Bus Utilization", 0, { 122 { REQ, "/sys/kernel/debug/tracing/events/memory_bus/enable" }, 123 } }, 124 { "idle", "CPU Idle", 0, { 125 { REQ, "/sys/kernel/debug/tracing/events/power/cpu_idle/enable" }, 126 } }, 127 { "disk", "Disk I/O", 0, { 128 { OPT, "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable" }, 129 { OPT, "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable" }, 130 { OPT, "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable" }, 131 { OPT, "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable" }, 132 { OPT, "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable" }, 133 { OPT, "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable" }, 134 { OPT, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable" }, 135 { OPT, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable" }, 136 { REQ, "/sys/kernel/debug/tracing/events/block/block_rq_issue/enable" }, 137 { REQ, "/sys/kernel/debug/tracing/events/block/block_rq_complete/enable" }, 138 } }, 139 { "mmc", "eMMC commands", 0, { 140 { REQ, "/sys/kernel/debug/tracing/events/mmc/enable" }, 141 } }, 142 { "load", "CPU Load", 0, { 143 { REQ, "/sys/kernel/debug/tracing/events/cpufreq_interactive/enable" }, 144 } }, 145 { "sync", "Synchronization", 0, { 146 { REQ, "/sys/kernel/debug/tracing/events/sync/enable" }, 147 } }, 148 { "workq", "Kernel Workqueues", 0, { 149 { REQ, "/sys/kernel/debug/tracing/events/workqueue/enable" }, 150 } }, 151 { "memreclaim", "Kernel Memory Reclaim", 0, { 152 { REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable" }, 153 { REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable" }, 154 { REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable" }, 155 { REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable" }, 156 } }, 157 { "regulators", "Voltage and Current Regulators", 0, { 158 { REQ, "/sys/kernel/debug/tracing/events/regulator/enable" }, 159 } }, 160 { "binder_driver", "Binder Kernel driver", 0, { 161 { REQ, "/sys/kernel/debug/tracing/events/binder/binder_transaction/enable" }, 162 { REQ, "/sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable" }, 163 } }, 164 { "binder_lock", "Binder global lock trace", 0, { 165 { REQ, "/sys/kernel/debug/tracing/events/binder/binder_lock/enable" }, 166 { REQ, "/sys/kernel/debug/tracing/events/binder/binder_locked/enable" }, 167 { REQ, "/sys/kernel/debug/tracing/events/binder/binder_unlock/enable" }, 168 } }, 169 { "pagecache", "Page cache", 0, { 170 { REQ, "/sys/kernel/debug/tracing/events/filemap/enable" }, 171 } }, 172}; 173 174/* Command line options */ 175static int g_traceDurationSeconds = 5; 176static bool g_traceOverwrite = false; 177static int g_traceBufferSizeKB = 2048; 178static bool g_compress = false; 179static bool g_nohup = false; 180static int g_initialSleepSecs = 0; 181static const char* g_categoriesFile = NULL; 182static const char* g_kernelTraceFuncs = NULL; 183static const char* g_debugAppCmdLine = ""; 184static const char* g_outputFile = nullptr; 185 186/* Global state */ 187static bool g_traceAborted = false; 188static bool g_categoryEnables[NELEM(k_categories)] = {}; 189 190/* Sys file paths */ 191static const char* k_traceClockPath = 192 "/sys/kernel/debug/tracing/trace_clock"; 193 194static const char* k_traceBufferSizePath = 195 "/sys/kernel/debug/tracing/buffer_size_kb"; 196 197static const char* k_tracingOverwriteEnablePath = 198 "/sys/kernel/debug/tracing/options/overwrite"; 199 200static const char* k_currentTracerPath = 201 "/sys/kernel/debug/tracing/current_tracer"; 202 203static const char* k_printTgidPath = 204 "/sys/kernel/debug/tracing/options/print-tgid"; 205 206static const char* k_funcgraphAbsTimePath = 207 "/sys/kernel/debug/tracing/options/funcgraph-abstime"; 208 209static const char* k_funcgraphCpuPath = 210 "/sys/kernel/debug/tracing/options/funcgraph-cpu"; 211 212static const char* k_funcgraphProcPath = 213 "/sys/kernel/debug/tracing/options/funcgraph-proc"; 214 215static const char* k_funcgraphFlatPath = 216 "/sys/kernel/debug/tracing/options/funcgraph-flat"; 217 218static const char* k_funcgraphDurationPath = 219 "/sys/kernel/debug/tracing/options/funcgraph-duration"; 220 221static const char* k_ftraceFilterPath = 222 "/sys/kernel/debug/tracing/set_ftrace_filter"; 223 224static const char* k_tracingOnPath = 225 "/sys/kernel/debug/tracing/tracing_on"; 226 227static const char* k_tracePath = 228 "/sys/kernel/debug/tracing/trace"; 229 230static const char* k_traceStreamPath = 231 "/sys/kernel/debug/tracing/trace_pipe"; 232 233static const char* k_traceMarkerPath = 234 "/sys/kernel/debug/tracing/trace_marker"; 235 236// Check whether a file exists. 237static bool fileExists(const char* filename) { 238 return access(filename, F_OK) != -1; 239} 240 241// Check whether a file is writable. 242static bool fileIsWritable(const char* filename) { 243 return access(filename, W_OK) != -1; 244} 245 246// Truncate a file. 247static bool truncateFile(const char* path) 248{ 249 // This uses creat rather than truncate because some of the debug kernel 250 // device nodes (e.g. k_ftraceFilterPath) currently aren't changed by 251 // calls to truncate, but they are cleared by calls to creat. 252 int traceFD = creat(path, 0); 253 if (traceFD == -1) { 254 fprintf(stderr, "error truncating %s: %s (%d)\n", path, 255 strerror(errno), errno); 256 return false; 257 } 258 259 close(traceFD); 260 261 return true; 262} 263 264static bool _writeStr(const char* filename, const char* str, int flags) 265{ 266 int fd = open(filename, flags); 267 if (fd == -1) { 268 fprintf(stderr, "error opening %s: %s (%d)\n", filename, 269 strerror(errno), errno); 270 return false; 271 } 272 273 bool ok = true; 274 ssize_t len = strlen(str); 275 if (write(fd, str, len) != len) { 276 fprintf(stderr, "error writing to %s: %s (%d)\n", filename, 277 strerror(errno), errno); 278 ok = false; 279 } 280 281 close(fd); 282 283 return ok; 284} 285 286// Write a string to a file, returning true if the write was successful. 287static bool writeStr(const char* filename, const char* str) 288{ 289 return _writeStr(filename, str, O_WRONLY); 290} 291 292// Append a string to a file, returning true if the write was successful. 293static bool appendStr(const char* filename, const char* str) 294{ 295 return _writeStr(filename, str, O_APPEND|O_WRONLY); 296} 297 298static void writeClockSyncMarker() 299{ 300 char buffer[128]; 301 int len = 0; 302 int fd = open(k_traceMarkerPath, O_WRONLY); 303 if (fd == -1) { 304 fprintf(stderr, "error opening %s: %s (%d)\n", k_traceMarkerPath, 305 strerror(errno), errno); 306 return; 307 } 308 float now_in_seconds = systemTime(CLOCK_MONOTONIC) / 1000000000.0f; 309 310 len = snprintf(buffer, 128, "trace_event_clock_sync: parent_ts=%f\n", now_in_seconds); 311 if (write(fd, buffer, len) != len) { 312 fprintf(stderr, "error writing clock sync marker %s (%d)\n", strerror(errno), errno); 313 } 314 315 int64_t realtime_in_ms = systemTime(CLOCK_REALTIME) / 1000000; 316 len = snprintf(buffer, 128, "trace_event_clock_sync: realtime_ts=%" PRId64 "\n", realtime_in_ms); 317 if (write(fd, buffer, len) != len) { 318 fprintf(stderr, "error writing clock sync marker %s (%d)\n", strerror(errno), errno); 319 } 320 321 close(fd); 322} 323 324// Enable or disable a kernel option by writing a "1" or a "0" into a /sys 325// file. 326static bool setKernelOptionEnable(const char* filename, bool enable) 327{ 328 return writeStr(filename, enable ? "1" : "0"); 329} 330 331// Check whether the category is supported on the device with the current 332// rootness. A category is supported only if all its required /sys/ files are 333// writable and if enabling the category will enable one or more tracing tags 334// or /sys/ files. 335static bool isCategorySupported(const TracingCategory& category) 336{ 337 if (strcmp(category.name, k_coreServiceCategory) == 0) { 338 char value[PROPERTY_VALUE_MAX]; 339 property_get(k_coreServicesProp, value, ""); 340 return strlen(value) != 0; 341 } 342 343 bool ok = category.tags != 0; 344 for (int i = 0; i < MAX_SYS_FILES; i++) { 345 const char* path = category.sysfiles[i].path; 346 bool req = category.sysfiles[i].required == REQ; 347 if (path != NULL) { 348 if (req) { 349 if (!fileIsWritable(path)) { 350 return false; 351 } else { 352 ok = true; 353 } 354 } else { 355 ok |= fileIsWritable(path); 356 } 357 } 358 } 359 return ok; 360} 361 362// Check whether the category would be supported on the device if the user 363// were root. This function assumes that root is able to write to any file 364// that exists. It performs the same logic as isCategorySupported, but it 365// uses file existance rather than writability in the /sys/ file checks. 366static bool isCategorySupportedForRoot(const TracingCategory& category) 367{ 368 bool ok = category.tags != 0; 369 for (int i = 0; i < MAX_SYS_FILES; i++) { 370 const char* path = category.sysfiles[i].path; 371 bool req = category.sysfiles[i].required == REQ; 372 if (path != NULL) { 373 if (req) { 374 if (!fileExists(path)) { 375 return false; 376 } else { 377 ok = true; 378 } 379 } else { 380 ok |= fileExists(path); 381 } 382 } 383 } 384 return ok; 385} 386 387// Enable or disable overwriting of the kernel trace buffers. Disabling this 388// will cause tracing to stop once the trace buffers have filled up. 389static bool setTraceOverwriteEnable(bool enable) 390{ 391 return setKernelOptionEnable(k_tracingOverwriteEnablePath, enable); 392} 393 394// Enable or disable kernel tracing. 395static bool setTracingEnabled(bool enable) 396{ 397 return setKernelOptionEnable(k_tracingOnPath, enable); 398} 399 400// Clear the contents of the kernel trace. 401static bool clearTrace() 402{ 403 return truncateFile(k_tracePath); 404} 405 406// Set the size of the kernel's trace buffer in kilobytes. 407static bool setTraceBufferSizeKB(int size) 408{ 409 char str[32] = "1"; 410 int len; 411 if (size < 1) { 412 size = 1; 413 } 414 snprintf(str, 32, "%d", size); 415 return writeStr(k_traceBufferSizePath, str); 416} 417 418// Read the trace_clock sysfs file and return true if it matches the requested 419// value. The trace_clock file format is: 420// local [global] counter uptime perf 421static bool isTraceClock(const char *mode) 422{ 423 int fd = open(k_traceClockPath, O_RDONLY); 424 if (fd == -1) { 425 fprintf(stderr, "error opening %s: %s (%d)\n", k_traceClockPath, 426 strerror(errno), errno); 427 return false; 428 } 429 430 char buf[4097]; 431 ssize_t n = read(fd, buf, 4096); 432 close(fd); 433 if (n == -1) { 434 fprintf(stderr, "error reading %s: %s (%d)\n", k_traceClockPath, 435 strerror(errno), errno); 436 return false; 437 } 438 buf[n] = '\0'; 439 440 char *start = strchr(buf, '['); 441 if (start == NULL) { 442 return false; 443 } 444 start++; 445 446 char *end = strchr(start, ']'); 447 if (end == NULL) { 448 return false; 449 } 450 *end = '\0'; 451 452 return strcmp(mode, start) == 0; 453} 454 455// Enable or disable the kernel's use of the global clock. Disabling the global 456// clock will result in the kernel using a per-CPU local clock. 457// Any write to the trace_clock sysfs file will reset the buffer, so only 458// update it if the requested value is not the current value. 459static bool setGlobalClockEnable(bool enable) 460{ 461 const char *clock = enable ? "global" : "local"; 462 463 if (isTraceClock(clock)) { 464 return true; 465 } 466 467 return writeStr(k_traceClockPath, clock); 468} 469 470static bool setPrintTgidEnableIfPresent(bool enable) 471{ 472 if (fileExists(k_printTgidPath)) { 473 return setKernelOptionEnable(k_printTgidPath, enable); 474 } 475 return true; 476} 477 478// Poke all the binder-enabled processes in the system to get them to re-read 479// their system properties. 480static bool pokeBinderServices() 481{ 482 sp<IServiceManager> sm = defaultServiceManager(); 483 Vector<String16> services = sm->listServices(); 484 for (size_t i = 0; i < services.size(); i++) { 485 sp<IBinder> obj = sm->checkService(services[i]); 486 if (obj != NULL) { 487 Parcel data; 488 if (obj->transact(IBinder::SYSPROPS_TRANSACTION, data, 489 NULL, 0) != OK) { 490 if (false) { 491 // XXX: For some reason this fails on tablets trying to 492 // poke the "phone" service. It's not clear whether some 493 // are expected to fail. 494 String8 svc(services[i]); 495 fprintf(stderr, "error poking binder service %s\n", 496 svc.string()); 497 return false; 498 } 499 } 500 } 501 } 502 return true; 503} 504 505// Set the trace tags that userland tracing uses, and poke the running 506// processes to pick up the new value. 507static bool setTagsProperty(uint64_t tags) 508{ 509 char buf[PROPERTY_VALUE_MAX]; 510 snprintf(buf, sizeof(buf), "%#" PRIx64, tags); 511 if (property_set(k_traceTagsProperty, buf) < 0) { 512 fprintf(stderr, "error setting trace tags system property\n"); 513 return false; 514 } 515 return true; 516} 517 518static void clearAppProperties() 519{ 520 char buf[PROPERTY_KEY_MAX]; 521 for (int i = 0; i < MAX_PACKAGES; i++) { 522 snprintf(buf, sizeof(buf), k_traceAppsPropertyTemplate, i); 523 if (property_set(buf, "") < 0) { 524 fprintf(stderr, "failed to clear system property: %s\n", buf); 525 } 526 } 527 if (property_set(k_traceAppsNumberProperty, "") < 0) { 528 fprintf(stderr, "failed to clear system property: %s", 529 k_traceAppsNumberProperty); 530 } 531} 532 533// Set the system property that indicates which apps should perform 534// application-level tracing. 535static bool setAppCmdlineProperty(const char* cmdline) 536{ 537 char buf[PROPERTY_KEY_MAX]; 538 int i = 0; 539 const char* start = cmdline; 540 while (start != NULL) { 541 if (i == MAX_PACKAGES) { 542 fprintf(stderr, "error: only 16 packages could be traced at once\n"); 543 clearAppProperties(); 544 return false; 545 } 546 char* end = strchr(start, ','); 547 if (end != NULL) { 548 *end = '\0'; 549 end++; 550 } 551 snprintf(buf, sizeof(buf), k_traceAppsPropertyTemplate, i); 552 if (property_set(buf, start) < 0) { 553 fprintf(stderr, "error setting trace app %d property to %s\n", i, buf); 554 clearAppProperties(); 555 return false; 556 } 557 start = end; 558 i++; 559 } 560 561 snprintf(buf, sizeof(buf), "%d", i); 562 if (property_set(k_traceAppsNumberProperty, buf) < 0) { 563 fprintf(stderr, "error setting trace app number property to %s\n", buf); 564 clearAppProperties(); 565 return false; 566 } 567 return true; 568} 569 570// Disable all /sys/ enable files. 571static bool disableKernelTraceEvents() { 572 bool ok = true; 573 for (int i = 0; i < NELEM(k_categories); i++) { 574 const TracingCategory &c = k_categories[i]; 575 for (int j = 0; j < MAX_SYS_FILES; j++) { 576 const char* path = c.sysfiles[j].path; 577 if (path != NULL && fileIsWritable(path)) { 578 ok &= setKernelOptionEnable(path, false); 579 } 580 } 581 } 582 return ok; 583} 584 585// Verify that the comma separated list of functions are being traced by the 586// kernel. 587static bool verifyKernelTraceFuncs(const char* funcs) 588{ 589 int fd = open(k_ftraceFilterPath, O_RDONLY); 590 if (fd == -1) { 591 fprintf(stderr, "error opening %s: %s (%d)\n", k_ftraceFilterPath, 592 strerror(errno), errno); 593 return false; 594 } 595 596 char buf[4097]; 597 ssize_t n = read(fd, buf, 4096); 598 close(fd); 599 if (n == -1) { 600 fprintf(stderr, "error reading %s: %s (%d)\n", k_ftraceFilterPath, 601 strerror(errno), errno); 602 return false; 603 } 604 605 buf[n] = '\0'; 606 String8 funcList = String8::format("\n%s", buf); 607 608 // Make sure that every function listed in funcs is in the list we just 609 // read from the kernel, except for wildcard inputs. 610 bool ok = true; 611 char* myFuncs = strdup(funcs); 612 char* func = strtok(myFuncs, ","); 613 while (func) { 614 if (!strchr(func, '*')) { 615 String8 fancyFunc = String8::format("\n%s\n", func); 616 bool found = funcList.find(fancyFunc.string(), 0) >= 0; 617 if (!found || func[0] == '\0') { 618 fprintf(stderr, "error: \"%s\" is not a valid kernel function " 619 "to trace.\n", func); 620 ok = false; 621 } 622 } 623 func = strtok(NULL, ","); 624 } 625 free(myFuncs); 626 627 return ok; 628} 629 630// Set the comma separated list of functions that the kernel is to trace. 631static bool setKernelTraceFuncs(const char* funcs) 632{ 633 bool ok = true; 634 635 if (funcs == NULL || funcs[0] == '\0') { 636 // Disable kernel function tracing. 637 if (fileIsWritable(k_currentTracerPath)) { 638 ok &= writeStr(k_currentTracerPath, "nop"); 639 } 640 if (fileIsWritable(k_ftraceFilterPath)) { 641 ok &= truncateFile(k_ftraceFilterPath); 642 } 643 } else { 644 // Enable kernel function tracing. 645 ok &= writeStr(k_currentTracerPath, "function_graph"); 646 ok &= setKernelOptionEnable(k_funcgraphAbsTimePath, true); 647 ok &= setKernelOptionEnable(k_funcgraphCpuPath, true); 648 ok &= setKernelOptionEnable(k_funcgraphProcPath, true); 649 ok &= setKernelOptionEnable(k_funcgraphFlatPath, true); 650 651 // Set the requested filter functions. 652 ok &= truncateFile(k_ftraceFilterPath); 653 char* myFuncs = strdup(funcs); 654 char* func = strtok(myFuncs, ","); 655 while (func) { 656 ok &= appendStr(k_ftraceFilterPath, func); 657 func = strtok(NULL, ","); 658 } 659 free(myFuncs); 660 661 // Verify that the set functions are being traced. 662 if (ok) { 663 ok &= verifyKernelTraceFuncs(funcs); 664 } 665 } 666 667 return ok; 668} 669 670static bool setCategoryEnable(const char* name, bool enable) 671{ 672 for (int i = 0; i < NELEM(k_categories); i++) { 673 const TracingCategory& c = k_categories[i]; 674 if (strcmp(name, c.name) == 0) { 675 if (isCategorySupported(c)) { 676 g_categoryEnables[i] = enable; 677 return true; 678 } else { 679 if (isCategorySupportedForRoot(c)) { 680 fprintf(stderr, "error: category \"%s\" requires root " 681 "privileges.\n", name); 682 } else { 683 fprintf(stderr, "error: category \"%s\" is not supported " 684 "on this device.\n", name); 685 } 686 return false; 687 } 688 } 689 } 690 fprintf(stderr, "error: unknown tracing category \"%s\"\n", name); 691 return false; 692} 693 694static bool setCategoriesEnableFromFile(const char* categories_file) 695{ 696 if (!categories_file) { 697 return true; 698 } 699 Tokenizer* tokenizer = NULL; 700 if (Tokenizer::open(String8(categories_file), &tokenizer) != NO_ERROR) { 701 return false; 702 } 703 bool ok = true; 704 while (!tokenizer->isEol()) { 705 String8 token = tokenizer->nextToken(" "); 706 if (token.isEmpty()) { 707 tokenizer->skipDelimiters(" "); 708 continue; 709 } 710 ok &= setCategoryEnable(token.string(), true); 711 } 712 delete tokenizer; 713 return ok; 714} 715 716// Set all the kernel tracing settings to the desired state for this trace 717// capture. 718static bool setUpTrace() 719{ 720 bool ok = true; 721 722 // Set up the tracing options. 723 ok &= setCategoriesEnableFromFile(g_categoriesFile); 724 ok &= setTraceOverwriteEnable(g_traceOverwrite); 725 ok &= setTraceBufferSizeKB(g_traceBufferSizeKB); 726 ok &= setGlobalClockEnable(true); 727 ok &= setPrintTgidEnableIfPresent(true); 728 ok &= setKernelTraceFuncs(g_kernelTraceFuncs); 729 730 // Set up the tags property. 731 uint64_t tags = 0; 732 for (int i = 0; i < NELEM(k_categories); i++) { 733 if (g_categoryEnables[i]) { 734 const TracingCategory &c = k_categories[i]; 735 tags |= c.tags; 736 } 737 } 738 ok &= setTagsProperty(tags); 739 740 bool coreServicesTagEnabled = false; 741 for (int i = 0; i < NELEM(k_categories); i++) { 742 if (strcmp(k_categories[i].name, k_coreServiceCategory) == 0) { 743 coreServicesTagEnabled = g_categoryEnables[i]; 744 } 745 } 746 747 std::string packageList(g_debugAppCmdLine); 748 if (coreServicesTagEnabled) { 749 char value[PROPERTY_VALUE_MAX]; 750 property_get(k_coreServicesProp, value, ""); 751 if (!packageList.empty()) { 752 packageList += ","; 753 } 754 packageList += value; 755 } 756 ok &= setAppCmdlineProperty(packageList.data()); 757 ok &= pokeBinderServices(); 758 759 // Disable all the sysfs enables. This is done as a separate loop from 760 // the enables to allow the same enable to exist in multiple categories. 761 ok &= disableKernelTraceEvents(); 762 763 // Enable all the sysfs enables that are in an enabled category. 764 for (int i = 0; i < NELEM(k_categories); i++) { 765 if (g_categoryEnables[i]) { 766 const TracingCategory &c = k_categories[i]; 767 for (int j = 0; j < MAX_SYS_FILES; j++) { 768 const char* path = c.sysfiles[j].path; 769 bool required = c.sysfiles[j].required == REQ; 770 if (path != NULL) { 771 if (fileIsWritable(path)) { 772 ok &= setKernelOptionEnable(path, true); 773 } else if (required) { 774 fprintf(stderr, "error writing file %s\n", path); 775 ok = false; 776 } 777 } 778 } 779 } 780 } 781 782 return ok; 783} 784 785// Reset all the kernel tracing settings to their default state. 786static void cleanUpTrace() 787{ 788 // Disable all tracing that we're able to. 789 disableKernelTraceEvents(); 790 791 // Reset the system properties. 792 setTagsProperty(0); 793 clearAppProperties(); 794 pokeBinderServices(); 795 796 // Set the options back to their defaults. 797 setTraceOverwriteEnable(true); 798 setTraceBufferSizeKB(1); 799 setGlobalClockEnable(false); 800 setPrintTgidEnableIfPresent(false); 801 setKernelTraceFuncs(NULL); 802} 803 804 805// Enable tracing in the kernel. 806static bool startTrace() 807{ 808 return setTracingEnabled(true); 809} 810 811// Disable tracing in the kernel. 812static void stopTrace() 813{ 814 setTracingEnabled(false); 815} 816 817// Read data from the tracing pipe and forward to stdout 818static void streamTrace() 819{ 820 char trace_data[4096]; 821 int traceFD = open(k_traceStreamPath, O_RDWR); 822 if (traceFD == -1) { 823 fprintf(stderr, "error opening %s: %s (%d)\n", k_traceStreamPath, 824 strerror(errno), errno); 825 return; 826 } 827 while (!g_traceAborted) { 828 ssize_t bytes_read = read(traceFD, trace_data, 4096); 829 if (bytes_read > 0) { 830 write(STDOUT_FILENO, trace_data, bytes_read); 831 fflush(stdout); 832 } else { 833 if (!g_traceAborted) { 834 fprintf(stderr, "read returned %zd bytes err %d (%s)\n", 835 bytes_read, errno, strerror(errno)); 836 } 837 break; 838 } 839 } 840} 841 842// Read the current kernel trace and write it to stdout. 843static void dumpTrace(int outFd) 844{ 845 ALOGI("Dumping trace"); 846 int traceFD = open(k_tracePath, O_RDWR); 847 if (traceFD == -1) { 848 fprintf(stderr, "error opening %s: %s (%d)\n", k_tracePath, 849 strerror(errno), errno); 850 return; 851 } 852 853 if (g_compress) { 854 z_stream zs; 855 uint8_t *in, *out; 856 int result, flush; 857 858 memset(&zs, 0, sizeof(zs)); 859 result = deflateInit(&zs, Z_DEFAULT_COMPRESSION); 860 if (result != Z_OK) { 861 fprintf(stderr, "error initializing zlib: %d\n", result); 862 close(traceFD); 863 return; 864 } 865 866 const size_t bufSize = 64*1024; 867 in = (uint8_t*)malloc(bufSize); 868 out = (uint8_t*)malloc(bufSize); 869 flush = Z_NO_FLUSH; 870 871 zs.next_out = out; 872 zs.avail_out = bufSize; 873 874 do { 875 876 if (zs.avail_in == 0) { 877 // More input is needed. 878 result = read(traceFD, in, bufSize); 879 if (result < 0) { 880 fprintf(stderr, "error reading trace: %s (%d)\n", 881 strerror(errno), errno); 882 result = Z_STREAM_END; 883 break; 884 } else if (result == 0) { 885 flush = Z_FINISH; 886 } else { 887 zs.next_in = in; 888 zs.avail_in = result; 889 } 890 } 891 892 if (zs.avail_out == 0) { 893 // Need to write the output. 894 result = write(outFd, out, bufSize); 895 if ((size_t)result < bufSize) { 896 fprintf(stderr, "error writing deflated trace: %s (%d)\n", 897 strerror(errno), errno); 898 result = Z_STREAM_END; // skip deflate error message 899 zs.avail_out = bufSize; // skip the final write 900 break; 901 } 902 zs.next_out = out; 903 zs.avail_out = bufSize; 904 } 905 906 } while ((result = deflate(&zs, flush)) == Z_OK); 907 908 if (result != Z_STREAM_END) { 909 fprintf(stderr, "error deflating trace: %s\n", zs.msg); 910 } 911 912 if (zs.avail_out < bufSize) { 913 size_t bytes = bufSize - zs.avail_out; 914 result = write(outFd, out, bytes); 915 if ((size_t)result < bytes) { 916 fprintf(stderr, "error writing deflated trace: %s (%d)\n", 917 strerror(errno), errno); 918 } 919 } 920 921 result = deflateEnd(&zs); 922 if (result != Z_OK) { 923 fprintf(stderr, "error cleaning up zlib: %d\n", result); 924 } 925 926 free(in); 927 free(out); 928 } else { 929 ssize_t sent = 0; 930 while ((sent = sendfile(outFd, traceFD, NULL, 64*1024*1024)) > 0); 931 if (sent == -1) { 932 fprintf(stderr, "error dumping trace: %s (%d)\n", strerror(errno), 933 errno); 934 } 935 } 936 937 close(traceFD); 938} 939 940static void handleSignal(int /*signo*/) 941{ 942 if (!g_nohup) { 943 g_traceAborted = true; 944 } 945} 946 947static void registerSigHandler() 948{ 949 struct sigaction sa; 950 sigemptyset(&sa.sa_mask); 951 sa.sa_flags = 0; 952 sa.sa_handler = handleSignal; 953 sigaction(SIGHUP, &sa, NULL); 954 sigaction(SIGINT, &sa, NULL); 955 sigaction(SIGQUIT, &sa, NULL); 956 sigaction(SIGTERM, &sa, NULL); 957} 958 959static void listSupportedCategories() 960{ 961 for (int i = 0; i < NELEM(k_categories); i++) { 962 const TracingCategory& c = k_categories[i]; 963 if (isCategorySupported(c)) { 964 printf(" %10s - %s\n", c.name, c.longname); 965 } 966 } 967} 968 969// Print the command usage help to stderr. 970static void showHelp(const char *cmd) 971{ 972 fprintf(stderr, "usage: %s [options] [categories...]\n", cmd); 973 fprintf(stderr, "options include:\n" 974 " -a appname enable app-level tracing for a comma " 975 "separated list of cmdlines\n" 976 " -b N use a trace buffer size of N KB\n" 977 " -c trace into a circular buffer\n" 978 " -f filename use the categories written in a file as space-separated\n" 979 " values in a line\n" 980 " -k fname,... trace the listed kernel functions\n" 981 " -n ignore signals\n" 982 " -s N sleep for N seconds before tracing [default 0]\n" 983 " -t N trace for N seconds [defualt 5]\n" 984 " -z compress the trace dump\n" 985 " --async_start start circular trace and return immediatly\n" 986 " --async_dump dump the current contents of circular trace buffer\n" 987 " --async_stop stop tracing and dump the current contents of circular\n" 988 " trace buffer\n" 989 " --stream stream trace to stdout as it enters the trace buffer\n" 990 " Note: this can take significant CPU time, and is best\n" 991 " used for measuring things that are not affected by\n" 992 " CPU performance, like pagecache usage.\n" 993 " --list_categories\n" 994 " list the available tracing categories\n" 995 " -o filename write the trace to the specified file instead\n" 996 " of stdout.\n" 997 ); 998} 999 1000int main(int argc, char **argv) 1001{ 1002 bool async = false; 1003 bool traceStart = true; 1004 bool traceStop = true; 1005 bool traceDump = true; 1006 bool traceStream = false; 1007 1008 if (argc == 2 && 0 == strcmp(argv[1], "--help")) { 1009 showHelp(argv[0]); 1010 exit(0); 1011 } 1012 1013 for (;;) { 1014 int ret; 1015 int option_index = 0; 1016 static struct option long_options[] = { 1017 {"async_start", no_argument, 0, 0 }, 1018 {"async_stop", no_argument, 0, 0 }, 1019 {"async_dump", no_argument, 0, 0 }, 1020 {"list_categories", no_argument, 0, 0 }, 1021 {"stream", no_argument, 0, 0 }, 1022 { 0, 0, 0, 0 } 1023 }; 1024 1025 ret = getopt_long(argc, argv, "a:b:cf:k:ns:t:zo:", 1026 long_options, &option_index); 1027 1028 if (ret < 0) { 1029 for (int i = optind; i < argc; i++) { 1030 if (!setCategoryEnable(argv[i], true)) { 1031 fprintf(stderr, "error enabling tracing category \"%s\"\n", argv[i]); 1032 exit(1); 1033 } 1034 } 1035 break; 1036 } 1037 1038 switch(ret) { 1039 case 'a': 1040 g_debugAppCmdLine = optarg; 1041 break; 1042 1043 case 'b': 1044 g_traceBufferSizeKB = atoi(optarg); 1045 break; 1046 1047 case 'c': 1048 g_traceOverwrite = true; 1049 break; 1050 1051 case 'f': 1052 g_categoriesFile = optarg; 1053 break; 1054 1055 case 'k': 1056 g_kernelTraceFuncs = optarg; 1057 break; 1058 1059 case 'n': 1060 g_nohup = true; 1061 break; 1062 1063 case 's': 1064 g_initialSleepSecs = atoi(optarg); 1065 break; 1066 1067 case 't': 1068 g_traceDurationSeconds = atoi(optarg); 1069 break; 1070 1071 case 'z': 1072 g_compress = true; 1073 break; 1074 1075 case 'o': 1076 g_outputFile = optarg; 1077 break; 1078 1079 case 0: 1080 if (!strcmp(long_options[option_index].name, "async_start")) { 1081 async = true; 1082 traceStop = false; 1083 traceDump = false; 1084 g_traceOverwrite = true; 1085 } else if (!strcmp(long_options[option_index].name, "async_stop")) { 1086 async = true; 1087 traceStart = false; 1088 } else if (!strcmp(long_options[option_index].name, "async_dump")) { 1089 async = true; 1090 traceStart = false; 1091 traceStop = false; 1092 } else if (!strcmp(long_options[option_index].name, "stream")) { 1093 traceStream = true; 1094 traceDump = false; 1095 } else if (!strcmp(long_options[option_index].name, "list_categories")) { 1096 listSupportedCategories(); 1097 exit(0); 1098 } 1099 break; 1100 1101 default: 1102 fprintf(stderr, "\n"); 1103 showHelp(argv[0]); 1104 exit(-1); 1105 break; 1106 } 1107 } 1108 1109 registerSigHandler(); 1110 1111 if (g_initialSleepSecs > 0) { 1112 sleep(g_initialSleepSecs); 1113 } 1114 1115 bool ok = true; 1116 ok &= setUpTrace(); 1117 ok &= startTrace(); 1118 1119 if (ok && traceStart) { 1120 if (!traceStream) { 1121 printf("capturing trace..."); 1122 fflush(stdout); 1123 } 1124 1125 // We clear the trace after starting it because tracing gets enabled for 1126 // each CPU individually in the kernel. Having the beginning of the trace 1127 // contain entries from only one CPU can cause "begin" entries without a 1128 // matching "end" entry to show up if a task gets migrated from one CPU to 1129 // another. 1130 ok = clearTrace(); 1131 1132 writeClockSyncMarker(); 1133 if (ok && !async && !traceStream) { 1134 // Sleep to allow the trace to be captured. 1135 struct timespec timeLeft; 1136 timeLeft.tv_sec = g_traceDurationSeconds; 1137 timeLeft.tv_nsec = 0; 1138 do { 1139 if (g_traceAborted) { 1140 break; 1141 } 1142 } while (nanosleep(&timeLeft, &timeLeft) == -1 && errno == EINTR); 1143 } 1144 1145 if (traceStream) { 1146 streamTrace(); 1147 } 1148 } 1149 1150 // Stop the trace and restore the default settings. 1151 if (traceStop) 1152 stopTrace(); 1153 1154 if (ok && traceDump) { 1155 if (!g_traceAborted) { 1156 printf(" done\n"); 1157 fflush(stdout); 1158 int outFd = STDOUT_FILENO; 1159 if (g_outputFile) { 1160 outFd = open(g_outputFile, O_WRONLY | O_CREAT); 1161 } 1162 if (outFd == -1) { 1163 printf("Failed to open '%s', err=%d", g_outputFile, errno); 1164 } else { 1165 dprintf(outFd, "TRACE:\n"); 1166 dumpTrace(outFd); 1167 if (g_outputFile) { 1168 close(outFd); 1169 } 1170 } 1171 } else { 1172 printf("\ntrace aborted.\n"); 1173 fflush(stdout); 1174 } 1175 clearTrace(); 1176 } else if (!ok) { 1177 fprintf(stderr, "unable to start tracing\n"); 1178 } 1179 1180 // Reset the trace buffer size to 1. 1181 if (traceStop) 1182 cleanUpTrace(); 1183 1184 return g_traceAborted ? 1 : 0; 1185} 1186