Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 1 | |
| 2 | |
Peter Zijlstra | 1a482f3 | 2009-05-23 18:28:58 +0200 | [diff] [blame] | 3 | #include "perf.h" |
Thomas Gleixner | 6eda583 | 2009-05-01 18:29:57 +0200 | [diff] [blame] | 4 | #include "util/util.h" |
| 5 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <sys/time.h> |
| 9 | #include <unistd.h> |
| 10 | #include <stdint.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <string.h> |
| 13 | #include <limits.h> |
| 14 | #include <getopt.h> |
| 15 | #include <assert.h> |
| 16 | #include <fcntl.h> |
| 17 | #include <stdio.h> |
| 18 | #include <errno.h> |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 19 | #include <time.h> |
| 20 | #include <sched.h> |
| 21 | #include <pthread.h> |
| 22 | |
| 23 | #include <sys/syscall.h> |
| 24 | #include <sys/ioctl.h> |
| 25 | #include <sys/poll.h> |
| 26 | #include <sys/prctl.h> |
| 27 | #include <sys/wait.h> |
| 28 | #include <sys/uio.h> |
| 29 | #include <sys/mman.h> |
| 30 | |
| 31 | #include <linux/unistd.h> |
| 32 | #include <linux/types.h> |
| 33 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 34 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 35 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 36 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| 37 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
| 38 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 39 | static int nr_counters = 0; |
| 40 | static __u64 event_id[MAX_COUNTERS] = { }; |
| 41 | static int default_interval = 100000; |
| 42 | static int event_count[MAX_COUNTERS]; |
| 43 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
| 44 | static int nr_cpus = 0; |
| 45 | static unsigned int page_size; |
| 46 | static unsigned int mmap_pages = 16; |
| 47 | static int output; |
| 48 | static char *output_name = "output.perf"; |
| 49 | static int group = 0; |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 50 | static unsigned int realtime_prio = 0; |
| 51 | static int system_wide = 0; |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 52 | static pid_t target_pid = -1; |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 53 | static int inherit = 1; |
| 54 | static int nmi = 1; |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 55 | |
| 56 | const unsigned int default_count[] = { |
| 57 | 1000000, |
| 58 | 1000000, |
| 59 | 10000, |
| 60 | 10000, |
| 61 | 1000000, |
| 62 | 10000, |
| 63 | }; |
| 64 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 65 | struct event_symbol { |
| 66 | __u64 event; |
| 67 | char *symbol; |
| 68 | }; |
| 69 | |
| 70 | static struct event_symbol event_symbols[] = { |
| 71 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", }, |
| 72 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", }, |
| 73 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", }, |
| 74 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", }, |
| 75 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", }, |
| 76 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", }, |
| 77 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", }, |
| 78 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", }, |
| 79 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", }, |
| 80 | |
| 81 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", }, |
| 82 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", }, |
| 83 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", }, |
| 84 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", }, |
| 85 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", }, |
| 86 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", }, |
| 87 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", }, |
| 88 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", }, |
| 89 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", }, |
| 90 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", }, |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * Each event can have multiple symbolic names. |
| 95 | * Symbolic names are (almost) exactly matched. |
| 96 | */ |
| 97 | static __u64 match_event_symbols(char *str) |
| 98 | { |
| 99 | __u64 config, id; |
| 100 | int type; |
| 101 | unsigned int i; |
| 102 | |
| 103 | if (sscanf(str, "r%llx", &config) == 1) |
| 104 | return config | PERF_COUNTER_RAW_MASK; |
| 105 | |
| 106 | if (sscanf(str, "%d:%llu", &type, &id) == 2) |
| 107 | return EID(type, id); |
| 108 | |
| 109 | for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { |
| 110 | if (!strncmp(str, event_symbols[i].symbol, |
| 111 | strlen(event_symbols[i].symbol))) |
| 112 | return event_symbols[i].event; |
| 113 | } |
| 114 | |
| 115 | return ~0ULL; |
| 116 | } |
| 117 | |
| 118 | static int parse_events(char *str) |
| 119 | { |
| 120 | __u64 config; |
| 121 | |
| 122 | again: |
| 123 | if (nr_counters == MAX_COUNTERS) |
| 124 | return -1; |
| 125 | |
| 126 | config = match_event_symbols(str); |
| 127 | if (config == ~0ULL) |
| 128 | return -1; |
| 129 | |
| 130 | event_id[nr_counters] = config; |
| 131 | nr_counters++; |
| 132 | |
| 133 | str = strstr(str, ","); |
| 134 | if (str) { |
| 135 | str++; |
| 136 | goto again; |
| 137 | } |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | #define __PERF_COUNTER_FIELD(config, name) \ |
| 143 | ((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT) |
| 144 | |
| 145 | #define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW) |
| 146 | #define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG) |
| 147 | #define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE) |
| 148 | #define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT) |
| 149 | |
| 150 | static void display_events_help(void) |
| 151 | { |
| 152 | unsigned int i; |
| 153 | __u64 e; |
| 154 | |
| 155 | printf( |
| 156 | " -e EVENT --event=EVENT # symbolic-name abbreviations"); |
| 157 | |
| 158 | for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { |
| 159 | int type, id; |
| 160 | |
| 161 | e = event_symbols[i].event; |
| 162 | type = PERF_COUNTER_TYPE(e); |
| 163 | id = PERF_COUNTER_ID(e); |
| 164 | |
| 165 | printf("\n %d:%d: %-20s", |
| 166 | type, id, event_symbols[i].symbol); |
| 167 | } |
| 168 | |
| 169 | printf("\n" |
| 170 | " rNNN: raw PMU events (eventsel+umask)\n\n"); |
| 171 | } |
| 172 | |
| 173 | static void display_help(void) |
| 174 | { |
| 175 | printf( |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 176 | "Usage: perf-record [<options>] <cmd>\n" |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 177 | "perf-record Options (up to %d event types can be specified at once):\n\n", |
| 178 | MAX_COUNTERS); |
| 179 | |
| 180 | display_events_help(); |
| 181 | |
| 182 | printf( |
| 183 | " -c CNT --count=CNT # event period to sample\n" |
| 184 | " -m pages --mmap_pages=<pages> # number of mmap data pages\n" |
| 185 | " -o file --output=<file> # output file\n" |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 186 | " -p pid --pid=<pid> # record events on existing pid\n" |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 187 | " -r prio --realtime=<prio> # use RT prio\n" |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 188 | " -s --system # system wide profiling\n" |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 189 | ); |
| 190 | |
| 191 | exit(0); |
| 192 | } |
| 193 | |
Ingo Molnar | 69aa48a | 2009-05-26 09:02:27 +0200 | [diff] [blame] | 194 | static void process_options(int argc, char * const argv[]) |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 195 | { |
| 196 | int error = 0, counter; |
| 197 | |
| 198 | for (;;) { |
| 199 | int option_index = 0; |
| 200 | /** Options for getopt */ |
| 201 | static struct option long_options[] = { |
| 202 | {"count", required_argument, NULL, 'c'}, |
| 203 | {"event", required_argument, NULL, 'e'}, |
| 204 | {"mmap_pages", required_argument, NULL, 'm'}, |
| 205 | {"output", required_argument, NULL, 'o'}, |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 206 | {"pid", required_argument, NULL, 'p'}, |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 207 | {"realtime", required_argument, NULL, 'r'}, |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 208 | {"system", no_argument, NULL, 's'}, |
| 209 | {"inherit", no_argument, NULL, 'i'}, |
| 210 | {"nmi", no_argument, NULL, 'n'}, |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 211 | {NULL, 0, NULL, 0 } |
| 212 | }; |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 213 | int c = getopt_long(argc, argv, "+:c:e:m:o:p:r:sin", |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 214 | long_options, &option_index); |
| 215 | if (c == -1) |
| 216 | break; |
| 217 | |
| 218 | switch (c) { |
| 219 | case 'c': default_interval = atoi(optarg); break; |
| 220 | case 'e': error = parse_events(optarg); break; |
| 221 | case 'm': mmap_pages = atoi(optarg); break; |
| 222 | case 'o': output_name = strdup(optarg); break; |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 223 | case 'p': target_pid = atoi(optarg); break; |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 224 | case 'r': realtime_prio = atoi(optarg); break; |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 225 | case 's': system_wide ^= 1; break; |
| 226 | case 'i': inherit ^= 1; break; |
| 227 | case 'n': nmi ^= 1; break; |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 228 | default: error = 1; break; |
| 229 | } |
| 230 | } |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 231 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 232 | if (argc - optind == 0 && target_pid == -1) |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 233 | error = 1; |
| 234 | |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 235 | if (error) |
| 236 | display_help(); |
| 237 | |
| 238 | if (!nr_counters) { |
| 239 | nr_counters = 1; |
| 240 | event_id[0] = 0; |
| 241 | } |
| 242 | |
| 243 | for (counter = 0; counter < nr_counters; counter++) { |
| 244 | if (event_count[counter]) |
| 245 | continue; |
| 246 | |
| 247 | event_count[counter] = default_interval; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | struct mmap_data { |
| 252 | int counter; |
| 253 | void *base; |
| 254 | unsigned int mask; |
| 255 | unsigned int prev; |
| 256 | }; |
| 257 | |
| 258 | static unsigned int mmap_read_head(struct mmap_data *md) |
| 259 | { |
| 260 | struct perf_counter_mmap_page *pc = md->base; |
| 261 | int head; |
| 262 | |
| 263 | head = pc->data_head; |
| 264 | rmb(); |
| 265 | |
| 266 | return head; |
| 267 | } |
| 268 | |
| 269 | static long events; |
| 270 | static struct timeval last_read, this_read; |
| 271 | |
| 272 | static void mmap_read(struct mmap_data *md) |
| 273 | { |
| 274 | unsigned int head = mmap_read_head(md); |
| 275 | unsigned int old = md->prev; |
| 276 | unsigned char *data = md->base + page_size; |
| 277 | unsigned long size; |
| 278 | void *buf; |
| 279 | int diff; |
| 280 | |
| 281 | gettimeofday(&this_read, NULL); |
| 282 | |
| 283 | /* |
| 284 | * If we're further behind than half the buffer, there's a chance |
| 285 | * the writer will bite our tail and screw up the events under us. |
| 286 | * |
| 287 | * If we somehow ended up ahead of the head, we got messed up. |
| 288 | * |
| 289 | * In either case, truncate and restart at head. |
| 290 | */ |
| 291 | diff = head - old; |
| 292 | if (diff > md->mask / 2 || diff < 0) { |
| 293 | struct timeval iv; |
| 294 | unsigned long msecs; |
| 295 | |
| 296 | timersub(&this_read, &last_read, &iv); |
| 297 | msecs = iv.tv_sec*1000 + iv.tv_usec/1000; |
| 298 | |
| 299 | fprintf(stderr, "WARNING: failed to keep up with mmap data." |
| 300 | " Last read %lu msecs ago.\n", msecs); |
| 301 | |
| 302 | /* |
| 303 | * head points to a known good entry, start there. |
| 304 | */ |
| 305 | old = head; |
| 306 | } |
| 307 | |
| 308 | last_read = this_read; |
| 309 | |
| 310 | if (old != head) |
| 311 | events++; |
| 312 | |
| 313 | size = head - old; |
| 314 | |
| 315 | if ((old & md->mask) + size != (head & md->mask)) { |
| 316 | buf = &data[old & md->mask]; |
| 317 | size = md->mask + 1 - (old & md->mask); |
| 318 | old += size; |
| 319 | while (size) { |
| 320 | int ret = write(output, buf, size); |
| 321 | if (ret < 0) { |
| 322 | perror("failed to write"); |
| 323 | exit(-1); |
| 324 | } |
| 325 | size -= ret; |
| 326 | buf += ret; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | buf = &data[old & md->mask]; |
| 331 | size = head - old; |
| 332 | old += size; |
| 333 | while (size) { |
| 334 | int ret = write(output, buf, size); |
| 335 | if (ret < 0) { |
| 336 | perror("failed to write"); |
| 337 | exit(-1); |
| 338 | } |
| 339 | size -= ret; |
| 340 | buf += ret; |
| 341 | } |
| 342 | |
| 343 | md->prev = old; |
| 344 | } |
| 345 | |
| 346 | static volatile int done = 0; |
| 347 | |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 348 | static void sig_handler(int sig) |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 349 | { |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 350 | done = 1; |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 351 | } |
| 352 | |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 353 | static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; |
| 354 | static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; |
| 355 | |
| 356 | static int nr_poll; |
| 357 | static int nr_cpu; |
| 358 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 359 | struct mmap_event { |
| 360 | struct perf_event_header header; |
| 361 | __u32 pid, tid; |
| 362 | __u64 start; |
| 363 | __u64 len; |
| 364 | __u64 pgoff; |
| 365 | char filename[PATH_MAX]; |
| 366 | }; |
| 367 | struct comm_event { |
| 368 | struct perf_event_header header; |
| 369 | __u32 pid,tid; |
| 370 | char comm[16]; |
| 371 | }; |
| 372 | |
| 373 | static pid_t pid_synthesize_comm_event(pid_t pid) |
| 374 | { |
| 375 | char filename[PATH_MAX]; |
| 376 | char bf[BUFSIZ]; |
| 377 | struct comm_event comm_ev; |
| 378 | size_t size; |
| 379 | int fd; |
| 380 | |
| 381 | snprintf(filename, sizeof(filename), "/proc/%d/stat", pid); |
| 382 | |
| 383 | fd = open(filename, O_RDONLY); |
| 384 | if (fd < 0) { |
| 385 | fprintf(stderr, "couldn't open %s\n", filename); |
| 386 | exit(EXIT_FAILURE); |
| 387 | } |
| 388 | if (read(fd, bf, sizeof(bf)) < 0) { |
| 389 | fprintf(stderr, "couldn't read %s\n", filename); |
| 390 | exit(EXIT_FAILURE); |
| 391 | } |
| 392 | close(fd); |
| 393 | |
| 394 | pid_t spid, ppid; |
| 395 | char state; |
| 396 | char comm[18]; |
| 397 | |
| 398 | memset(&comm_ev, 0, sizeof(comm_ev)); |
| 399 | int nr = sscanf(bf, "%d %s %c %d %d ", |
| 400 | &spid, comm, &state, &ppid, &comm_ev.pid); |
| 401 | if (nr != 5) { |
| 402 | fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n", |
| 403 | filename); |
| 404 | exit(EXIT_FAILURE); |
| 405 | } |
| 406 | comm_ev.header.type = PERF_EVENT_COMM; |
| 407 | comm_ev.tid = pid; |
| 408 | size = strlen(comm); |
| 409 | comm[--size] = '\0'; /* Remove the ')' at the end */ |
| 410 | --size; /* Remove the '(' at the begin */ |
| 411 | memcpy(comm_ev.comm, comm + 1, size); |
| 412 | size = ALIGN(size, sizeof(uint64_t)); |
| 413 | comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size); |
| 414 | int ret = write(output, &comm_ev, comm_ev.header.size); |
| 415 | if (ret < 0) { |
| 416 | perror("failed to write"); |
| 417 | exit(-1); |
| 418 | } |
| 419 | return comm_ev.pid; |
| 420 | } |
| 421 | |
| 422 | static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid) |
| 423 | { |
| 424 | char filename[PATH_MAX]; |
| 425 | FILE *fp; |
| 426 | |
| 427 | snprintf(filename, sizeof(filename), "/proc/%d/maps", pid); |
| 428 | |
| 429 | fp = fopen(filename, "r"); |
| 430 | if (fp == NULL) { |
| 431 | fprintf(stderr, "couldn't open %s\n", filename); |
| 432 | exit(EXIT_FAILURE); |
| 433 | } |
| 434 | while (1) { |
| 435 | char bf[BUFSIZ]; |
| 436 | unsigned char vm_read, vm_write, vm_exec, vm_mayshare; |
| 437 | struct mmap_event mmap_ev = { |
| 438 | .header.type = PERF_EVENT_MMAP, |
| 439 | }; |
| 440 | unsigned long ino; |
| 441 | int major, minor; |
| 442 | size_t size; |
| 443 | if (fgets(bf, sizeof(bf), fp) == NULL) |
| 444 | break; |
| 445 | |
| 446 | /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ |
| 447 | sscanf(bf, "%llx-%llx %c%c%c%c %llx %x:%x %lu", |
| 448 | &mmap_ev.start, &mmap_ev.len, |
| 449 | &vm_read, &vm_write, &vm_exec, &vm_mayshare, |
| 450 | &mmap_ev.pgoff, &major, &minor, &ino); |
| 451 | if (vm_exec == 'x') { |
| 452 | char *execname = strrchr(bf, ' '); |
| 453 | |
| 454 | if (execname == NULL || execname[1] != '/') |
| 455 | continue; |
| 456 | |
| 457 | execname += 1; |
| 458 | size = strlen(execname); |
| 459 | execname[size - 1] = '\0'; /* Remove \n */ |
| 460 | memcpy(mmap_ev.filename, execname, size); |
| 461 | size = ALIGN(size, sizeof(uint64_t)); |
| 462 | mmap_ev.len -= mmap_ev.start; |
| 463 | mmap_ev.header.size = (sizeof(mmap_ev) - |
| 464 | (sizeof(mmap_ev.filename) - size)); |
| 465 | mmap_ev.pid = pgid; |
| 466 | mmap_ev.tid = pid; |
| 467 | |
| 468 | if (write(output, &mmap_ev, mmap_ev.header.size) < 0) { |
| 469 | perror("failed to write"); |
| 470 | exit(-1); |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | fclose(fp); |
| 476 | } |
| 477 | |
| 478 | static void open_counters(int cpu, pid_t pid) |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 479 | { |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 480 | struct perf_counter_hw_event hw_event; |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 481 | int counter, group_fd; |
| 482 | int track = 1; |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 483 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 484 | if (pid > 0) { |
| 485 | pid_t pgid = pid_synthesize_comm_event(pid); |
| 486 | pid_synthesize_mmap_events(pid, pgid); |
| 487 | } |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 488 | |
| 489 | group_fd = -1; |
| 490 | for (counter = 0; counter < nr_counters; counter++) { |
| 491 | |
| 492 | memset(&hw_event, 0, sizeof(hw_event)); |
| 493 | hw_event.config = event_id[counter]; |
| 494 | hw_event.irq_period = event_count[counter]; |
| 495 | hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID; |
| 496 | hw_event.nmi = nmi; |
| 497 | hw_event.mmap = track; |
| 498 | hw_event.comm = track; |
| 499 | hw_event.inherit = (cpu < 0) && inherit; |
| 500 | |
| 501 | track = 0; // only the first counter needs these |
| 502 | |
| 503 | fd[nr_cpu][counter] = |
| 504 | sys_perf_counter_open(&hw_event, pid, cpu, group_fd, 0); |
| 505 | |
| 506 | if (fd[nr_cpu][counter] < 0) { |
| 507 | int err = errno; |
| 508 | printf("kerneltop error: syscall returned with %d (%s)\n", |
| 509 | fd[nr_cpu][counter], strerror(err)); |
| 510 | if (err == EPERM) |
| 511 | printf("Are you root?\n"); |
| 512 | exit(-1); |
| 513 | } |
| 514 | assert(fd[nr_cpu][counter] >= 0); |
| 515 | fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK); |
| 516 | |
| 517 | /* |
| 518 | * First counter acts as the group leader: |
| 519 | */ |
| 520 | if (group && group_fd == -1) |
| 521 | group_fd = fd[nr_cpu][counter]; |
| 522 | |
| 523 | event_array[nr_poll].fd = fd[nr_cpu][counter]; |
| 524 | event_array[nr_poll].events = POLLIN; |
| 525 | nr_poll++; |
| 526 | |
| 527 | mmap_array[nr_cpu][counter].counter = counter; |
| 528 | mmap_array[nr_cpu][counter].prev = 0; |
| 529 | mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1; |
| 530 | mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size, |
| 531 | PROT_READ, MAP_SHARED, fd[nr_cpu][counter], 0); |
| 532 | if (mmap_array[nr_cpu][counter].base == MAP_FAILED) { |
| 533 | printf("kerneltop error: failed to mmap with %d (%s)\n", |
| 534 | errno, strerror(errno)); |
| 535 | exit(-1); |
| 536 | } |
| 537 | } |
| 538 | nr_cpu++; |
| 539 | } |
| 540 | |
Ingo Molnar | 69aa48a | 2009-05-26 09:02:27 +0200 | [diff] [blame] | 541 | int cmd_record(int argc, char * const argv[]) |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 542 | { |
| 543 | int i, counter; |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 544 | pid_t pid; |
| 545 | int ret; |
| 546 | |
| 547 | page_size = sysconf(_SC_PAGE_SIZE); |
| 548 | |
| 549 | process_options(argc, argv); |
| 550 | |
| 551 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
| 552 | assert(nr_cpus <= MAX_NR_CPUS); |
| 553 | assert(nr_cpus >= 0); |
| 554 | |
| 555 | output = open(output_name, O_CREAT|O_RDWR, S_IRWXU); |
| 556 | if (output < 0) { |
| 557 | perror("failed to create output file"); |
| 558 | exit(-1); |
| 559 | } |
| 560 | |
| 561 | argc -= optind; |
| 562 | argv += optind; |
| 563 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 564 | if (!system_wide) { |
| 565 | open_counters(-1, target_pid != -1 ? target_pid : 0); |
| 566 | } else for (i = 0; i < nr_cpus; i++) |
| 567 | open_counters(i, target_pid); |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 568 | |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 569 | signal(SIGCHLD, sig_handler); |
| 570 | signal(SIGINT, sig_handler); |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 571 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 572 | if (target_pid == -1) { |
| 573 | pid = fork(); |
| 574 | if (pid < 0) |
| 575 | perror("failed to fork"); |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 576 | |
Arnaldo Carvalho de Melo | 1a853e3 | 2009-05-14 22:50:46 -0300 | [diff] [blame] | 577 | if (!pid) { |
| 578 | if (execvp(argv[0], argv)) { |
| 579 | perror(argv[0]); |
| 580 | exit(-1); |
| 581 | } |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 582 | } |
| 583 | } |
| 584 | |
| 585 | if (realtime_prio) { |
| 586 | struct sched_param param; |
| 587 | |
| 588 | param.sched_priority = realtime_prio; |
| 589 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { |
| 590 | printf("Could not set realtime priority.\n"); |
| 591 | exit(-1); |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * TODO: store the current /proc/$/maps information somewhere |
| 597 | */ |
| 598 | |
| 599 | while (!done) { |
| 600 | int hits = events; |
| 601 | |
Peter Zijlstra | 16c8a10 | 2009-05-05 17:50:27 +0200 | [diff] [blame] | 602 | for (i = 0; i < nr_cpu; i++) { |
Peter Zijlstra | de9ac07 | 2009-04-08 15:01:31 +0200 | [diff] [blame] | 603 | for (counter = 0; counter < nr_counters; counter++) |
| 604 | mmap_read(&mmap_array[i][counter]); |
| 605 | } |
| 606 | |
| 607 | if (hits == events) |
| 608 | ret = poll(event_array, nr_poll, 100); |
| 609 | } |
| 610 | |
| 611 | return 0; |
| 612 | } |