1 /* 2 * turbostat -- show CPU frequency and C-state residency 3 * on modern Intel turbo-capable processors. 4 * 5 * Copyright (c) 2010, Intel Corporation. 6 * Len Brown <len.brown@intel.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2, as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along with 18 * this program; if not, write to the Free Software Foundation, Inc., 19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 20 */ 21 22 #include <stdio.h> 23 #include <unistd.h> 24 #include <sys/types.h> 25 #include <sys/wait.h> 26 #include <sys/stat.h> 27 #include <sys/resource.h> 28 #include <fcntl.h> 29 #include <signal.h> 30 #include <sys/time.h> 31 #include <stdlib.h> 32 #include <dirent.h> 33 #include <string.h> 34 #include <ctype.h> 35 36 #define MSR_TSC 0x10 37 #define MSR_NEHALEM_PLATFORM_INFO 0xCE 38 #define MSR_NEHALEM_TURBO_RATIO_LIMIT 0x1AD 39 #define MSR_APERF 0xE8 40 #define MSR_MPERF 0xE7 41 #define MSR_PKG_C2_RESIDENCY 0x60D /* SNB only */ 42 #define MSR_PKG_C3_RESIDENCY 0x3F8 43 #define MSR_PKG_C6_RESIDENCY 0x3F9 44 #define MSR_PKG_C7_RESIDENCY 0x3FA /* SNB only */ 45 #define MSR_CORE_C3_RESIDENCY 0x3FC 46 #define MSR_CORE_C6_RESIDENCY 0x3FD 47 #define MSR_CORE_C7_RESIDENCY 0x3FE /* SNB only */ 48 49 char *proc_stat = "/proc/stat"; 50 unsigned int interval_sec = 5; /* set with -i interval_sec */ 51 unsigned int verbose; /* set with -v */ 52 unsigned int skip_c0; 53 unsigned int skip_c1; 54 unsigned int do_nhm_cstates; 55 unsigned int do_snb_cstates; 56 unsigned int has_aperf; 57 unsigned int units = 1000000000; /* Ghz etc */ 58 unsigned int genuine_intel; 59 unsigned int has_invariant_tsc; 60 unsigned int do_nehalem_platform_info; 61 unsigned int do_nehalem_turbo_ratio_limit; 62 unsigned int extra_msr_offset; 63 double bclk; 64 unsigned int show_pkg; 65 unsigned int show_core; 66 unsigned int show_cpu; 67 68 int aperf_mperf_unstable; 69 int backwards_count; 70 char *progname; 71 int need_reinitialize; 72 73 int num_cpus; 74 75 struct counters { 76 unsigned long long tsc; /* per thread */ 77 unsigned long long aperf; /* per thread */ 78 unsigned long long mperf; /* per thread */ 79 unsigned long long c1; /* per thread (calculated) */ 80 unsigned long long c3; /* per core */ 81 unsigned long long c6; /* per core */ 82 unsigned long long c7; /* per core */ 83 unsigned long long pc2; /* per package */ 84 unsigned long long pc3; /* per package */ 85 unsigned long long pc6; /* per package */ 86 unsigned long long pc7; /* per package */ 87 unsigned long long extra_msr; /* per thread */ 88 int pkg; 89 int core; 90 int cpu; 91 struct counters *next; 92 }; 93 94 struct counters *cnt_even; 95 struct counters *cnt_odd; 96 struct counters *cnt_delta; 97 struct counters *cnt_average; 98 struct timeval tv_even; 99 struct timeval tv_odd; 100 struct timeval tv_delta; 101 102 unsigned long long get_msr(int cpu, off_t offset) 103 { 104 ssize_t retval; 105 unsigned long long msr; 106 char pathname[32]; 107 int fd; 108 109 sprintf(pathname, "/dev/cpu/%d/msr", cpu); 110 fd = open(pathname, O_RDONLY); 111 if (fd < 0) { 112 perror(pathname); 113 need_reinitialize = 1; 114 return 0; 115 } 116 117 retval = pread(fd, &msr, sizeof msr, offset); 118 if (retval != sizeof msr) { 119 fprintf(stderr, "cpu%d pread(..., 0x%zx) = %jd\n", 120 cpu, offset, retval); 121 exit(-2); 122 } 123 124 close(fd); 125 return msr; 126 } 127 128 void print_header(void) 129 { 130 if (show_pkg) 131 fprintf(stderr, "pk"); 132 if (show_core) 133 fprintf(stderr, " cr"); 134 if (show_cpu) 135 fprintf(stderr, " CPU"); 136 if (do_nhm_cstates) 137 fprintf(stderr, " %%c0 "); 138 if (has_aperf) 139 fprintf(stderr, " GHz"); 140 fprintf(stderr, " TSC"); 141 if (do_nhm_cstates) 142 fprintf(stderr, " %%c1"); 143 if (do_nhm_cstates) 144 fprintf(stderr, " %%c3"); 145 if (do_nhm_cstates) 146 fprintf(stderr, " %%c6"); 147 if (do_snb_cstates) 148 fprintf(stderr, " %%c7"); 149 if (do_snb_cstates) 150 fprintf(stderr, " %%pc2"); 151 if (do_nhm_cstates) 152 fprintf(stderr, " %%pc3"); 153 if (do_nhm_cstates) 154 fprintf(stderr, " %%pc6"); 155 if (do_snb_cstates) 156 fprintf(stderr, " %%pc7"); 157 if (extra_msr_offset) 158 fprintf(stderr, " MSR 0x%x ", extra_msr_offset); 159 160 putc('\n', stderr); 161 } 162 163 void dump_cnt(struct counters *cnt) 164 { 165 if (!cnt) 166 return; 167 if (cnt->pkg) fprintf(stderr, "package: %d ", cnt->pkg); 168 if (cnt->core) fprintf(stderr, "core:: %d ", cnt->core); 169 if (cnt->cpu) fprintf(stderr, "CPU: %d ", cnt->cpu); 170 if (cnt->tsc) fprintf(stderr, "TSC: %016llX\n", cnt->tsc); 171 if (cnt->c3) fprintf(stderr, "c3: %016llX\n", cnt->c3); 172 if (cnt->c6) fprintf(stderr, "c6: %016llX\n", cnt->c6); 173 if (cnt->c7) fprintf(stderr, "c7: %016llX\n", cnt->c7); 174 if (cnt->aperf) fprintf(stderr, "aperf: %016llX\n", cnt->aperf); 175 if (cnt->pc2) fprintf(stderr, "pc2: %016llX\n", cnt->pc2); 176 if (cnt->pc3) fprintf(stderr, "pc3: %016llX\n", cnt->pc3); 177 if (cnt->pc6) fprintf(stderr, "pc6: %016llX\n", cnt->pc6); 178 if (cnt->pc7) fprintf(stderr, "pc7: %016llX\n", cnt->pc7); 179 if (cnt->extra_msr) fprintf(stderr, "msr0x%x: %016llX\n", extra_msr_offset, cnt->extra_msr); 180 } 181 182 void dump_list(struct counters *cnt) 183 { 184 printf("dump_list 0x%p\n", cnt); 185 186 for (; cnt; cnt = cnt->next) 187 dump_cnt(cnt); 188 } 189 190 void print_cnt(struct counters *p) 191 { 192 double interval_float; 193 194 interval_float = tv_delta.tv_sec + tv_delta.tv_usec/1000000.0; 195 196 /* topology columns, print blanks on 1st (average) line */ 197 if (p == cnt_average) { 198 if (show_pkg) 199 fprintf(stderr, " "); 200 if (show_core) 201 fprintf(stderr, " "); 202 if (show_cpu) 203 fprintf(stderr, " "); 204 } else { 205 if (show_pkg) 206 fprintf(stderr, "%d", p->pkg); 207 if (show_core) 208 fprintf(stderr, "%4d", p->core); 209 if (show_cpu) 210 fprintf(stderr, "%4d", p->cpu); 211 } 212 213 /* %c0 */ 214 if (do_nhm_cstates) { 215 if (!skip_c0) 216 fprintf(stderr, "%7.2f", 100.0 * p->mperf/p->tsc); 217 else 218 fprintf(stderr, " ****"); 219 } 220 221 /* GHz */ 222 if (has_aperf) { 223 if (!aperf_mperf_unstable) { 224 fprintf(stderr, "%5.2f", 225 1.0 * p->tsc / units * p->aperf / 226 p->mperf / interval_float); 227 } else { 228 if (p->aperf > p->tsc || p->mperf > p->tsc) { 229 fprintf(stderr, " ****"); 230 } else { 231 fprintf(stderr, "%4.1f*", 232 1.0 * p->tsc / 233 units * p->aperf / 234 p->mperf / interval_float); 235 } 236 } 237 } 238 239 /* TSC */ 240 fprintf(stderr, "%5.2f", 1.0 * p->tsc/units/interval_float); 241 242 if (do_nhm_cstates) { 243 if (!skip_c1) 244 fprintf(stderr, "%7.2f", 100.0 * p->c1/p->tsc); 245 else 246 fprintf(stderr, " ****"); 247 } 248 if (do_nhm_cstates) 249 fprintf(stderr, " %6.2f", 100.0 * p->c3/p->tsc); 250 if (do_nhm_cstates) 251 fprintf(stderr, " %6.2f", 100.0 * p->c6/p->tsc); 252 if (do_snb_cstates) 253 fprintf(stderr, " %6.2f", 100.0 * p->c7/p->tsc); 254 if (do_snb_cstates) 255 fprintf(stderr, " %5.2f", 100.0 * p->pc2/p->tsc); 256 if (do_nhm_cstates) 257 fprintf(stderr, " %5.2f", 100.0 * p->pc3/p->tsc); 258 if (do_nhm_cstates) 259 fprintf(stderr, " %5.2f", 100.0 * p->pc6/p->tsc); 260 if (do_snb_cstates) 261 fprintf(stderr, " %5.2f", 100.0 * p->pc7/p->tsc); 262 if (extra_msr_offset) 263 fprintf(stderr, " 0x%016llx", p->extra_msr); 264 putc('\n', stderr); 265 } 266 267 void print_counters(struct counters *counters) 268 { 269 struct counters *cnt; 270 271 print_header(); 272 273 if (num_cpus > 1) 274 print_cnt(cnt_average); 275 276 for (cnt = counters; cnt != NULL; cnt = cnt->next) 277 print_cnt(cnt); 278 279 } 280 281 #define SUBTRACT_COUNTER(after, before, delta) (delta = (after - before), (before > after)) 282 283 int compute_delta(struct counters *after, 284 struct counters *before, struct counters *delta) 285 { 286 int errors = 0; 287 int perf_err = 0; 288 289 skip_c0 = skip_c1 = 0; 290 291 for ( ; after && before && delta; 292 after = after->next, before = before->next, delta = delta->next) { 293 if (before->cpu != after->cpu) { 294 printf("cpu configuration changed: %d != %d\n", 295 before->cpu, after->cpu); 296 return -1; 297 } 298 299 if (SUBTRACT_COUNTER(after->tsc, before->tsc, delta->tsc)) { 300 fprintf(stderr, "cpu%d TSC went backwards %llX to %llX\n", 301 before->cpu, before->tsc, after->tsc); 302 errors++; 303 } 304 /* check for TSC < 1 Mcycles over interval */ 305 if (delta->tsc < (1000 * 1000)) { 306 fprintf(stderr, "Insanely slow TSC rate," 307 " TSC stops in idle?\n"); 308 fprintf(stderr, "You can disable all c-states" 309 " by booting with \"idle=poll\"\n"); 310 fprintf(stderr, "or just the deep ones with" 311 " \"processor.max_cstate=1\"\n"); 312 exit(-3); 313 } 314 if (SUBTRACT_COUNTER(after->c3, before->c3, delta->c3)) { 315 fprintf(stderr, "cpu%d c3 counter went backwards %llX to %llX\n", 316 before->cpu, before->c3, after->c3); 317 errors++; 318 } 319 if (SUBTRACT_COUNTER(after->c6, before->c6, delta->c6)) { 320 fprintf(stderr, "cpu%d c6 counter went backwards %llX to %llX\n", 321 before->cpu, before->c6, after->c6); 322 errors++; 323 } 324 if (SUBTRACT_COUNTER(after->c7, before->c7, delta->c7)) { 325 fprintf(stderr, "cpu%d c7 counter went backwards %llX to %llX\n", 326 before->cpu, before->c7, after->c7); 327 errors++; 328 } 329 if (SUBTRACT_COUNTER(after->pc2, before->pc2, delta->pc2)) { 330 fprintf(stderr, "cpu%d pc2 counter went backwards %llX to %llX\n", 331 before->cpu, before->pc2, after->pc2); 332 errors++; 333 } 334 if (SUBTRACT_COUNTER(after->pc3, before->pc3, delta->pc3)) { 335 fprintf(stderr, "cpu%d pc3 counter went backwards %llX to %llX\n", 336 before->cpu, before->pc3, after->pc3); 337 errors++; 338 } 339 if (SUBTRACT_COUNTER(after->pc6, before->pc6, delta->pc6)) { 340 fprintf(stderr, "cpu%d pc6 counter went backwards %llX to %llX\n", 341 before->cpu, before->pc6, after->pc6); 342 errors++; 343 } 344 if (SUBTRACT_COUNTER(after->pc7, before->pc7, delta->pc7)) { 345 fprintf(stderr, "cpu%d pc7 counter went backwards %llX to %llX\n", 346 before->cpu, before->pc7, after->pc7); 347 errors++; 348 } 349 350 perf_err = SUBTRACT_COUNTER(after->aperf, before->aperf, delta->aperf); 351 if (perf_err) { 352 fprintf(stderr, "cpu%d aperf counter went backwards %llX to %llX\n", 353 before->cpu, before->aperf, after->aperf); 354 } 355 perf_err |= SUBTRACT_COUNTER(after->mperf, before->mperf, delta->mperf); 356 if (perf_err) { 357 fprintf(stderr, "cpu%d mperf counter went backwards %llX to %llX\n", 358 before->cpu, before->mperf, after->mperf); 359 } 360 if (perf_err) { 361 if (!aperf_mperf_unstable) { 362 fprintf(stderr, "%s: APERF or MPERF went backwards *\n", progname); 363 fprintf(stderr, "* Frequency results do not cover entire interval *\n"); 364 fprintf(stderr, "* fix this by running Linux-2.6.30 or later *\n"); 365 366 aperf_mperf_unstable = 1; 367 } 368 /* 369 * mperf delta is likely a huge "positive" number 370 * can not use it for calculating c0 time 371 */ 372 skip_c0 = 1; 373 skip_c1 = 1; 374 } 375 376 /* 377 * As mperf and tsc collection are not atomic, 378 * it is possible for mperf's non-halted cycles 379 * to exceed TSC's all cycles: show c1 = 0% in that case. 380 */ 381 if (delta->mperf > delta->tsc) 382 delta->c1 = 0; 383 else /* normal case, derive c1 */ 384 delta->c1 = delta->tsc - delta->mperf 385 - delta->c3 - delta->c6 - delta->c7; 386 387 if (delta->mperf == 0) 388 delta->mperf = 1; /* divide by 0 protection */ 389 390 /* 391 * for "extra msr", just copy the latest w/o subtracting 392 */ 393 delta->extra_msr = after->extra_msr; 394 if (errors) { 395 fprintf(stderr, "ERROR cpu%d before:\n", before->cpu); 396 dump_cnt(before); 397 fprintf(stderr, "ERROR cpu%d after:\n", before->cpu); 398 dump_cnt(after); 399 errors = 0; 400 } 401 } 402 return 0; 403 } 404 405 void compute_average(struct counters *delta, struct counters *avg) 406 { 407 struct counters *sum; 408 409 sum = calloc(1, sizeof(struct counters)); 410 if (sum == NULL) { 411 perror("calloc sum"); 412 exit(1); 413 } 414 415 for (; delta; delta = delta->next) { 416 sum->tsc += delta->tsc; 417 sum->c1 += delta->c1; 418 sum->c3 += delta->c3; 419 sum->c6 += delta->c6; 420 sum->c7 += delta->c7; 421 sum->aperf += delta->aperf; 422 sum->mperf += delta->mperf; 423 sum->pc2 += delta->pc2; 424 sum->pc3 += delta->pc3; 425 sum->pc6 += delta->pc6; 426 sum->pc7 += delta->pc7; 427 } 428 avg->tsc = sum->tsc/num_cpus; 429 avg->c1 = sum->c1/num_cpus; 430 avg->c3 = sum->c3/num_cpus; 431 avg->c6 = sum->c6/num_cpus; 432 avg->c7 = sum->c7/num_cpus; 433 avg->aperf = sum->aperf/num_cpus; 434 avg->mperf = sum->mperf/num_cpus; 435 avg->pc2 = sum->pc2/num_cpus; 436 avg->pc3 = sum->pc3/num_cpus; 437 avg->pc6 = sum->pc6/num_cpus; 438 avg->pc7 = sum->pc7/num_cpus; 439 440 free(sum); 441 } 442 443 void get_counters(struct counters *cnt) 444 { 445 for ( ; cnt; cnt = cnt->next) { 446 cnt->tsc = get_msr(cnt->cpu, MSR_TSC); 447 if (do_nhm_cstates) 448 cnt->c3 = get_msr(cnt->cpu, MSR_CORE_C3_RESIDENCY); 449 if (do_nhm_cstates) 450 cnt->c6 = get_msr(cnt->cpu, MSR_CORE_C6_RESIDENCY); 451 if (do_snb_cstates) 452 cnt->c7 = get_msr(cnt->cpu, MSR_CORE_C7_RESIDENCY); 453 if (has_aperf) 454 cnt->aperf = get_msr(cnt->cpu, MSR_APERF); 455 if (has_aperf) 456 cnt->mperf = get_msr(cnt->cpu, MSR_MPERF); 457 if (do_snb_cstates) 458 cnt->pc2 = get_msr(cnt->cpu, MSR_PKG_C2_RESIDENCY); 459 if (do_nhm_cstates) 460 cnt->pc3 = get_msr(cnt->cpu, MSR_PKG_C3_RESIDENCY); 461 if (do_nhm_cstates) 462 cnt->pc6 = get_msr(cnt->cpu, MSR_PKG_C6_RESIDENCY); 463 if (do_snb_cstates) 464 cnt->pc7 = get_msr(cnt->cpu, MSR_PKG_C7_RESIDENCY); 465 if (extra_msr_offset) 466 cnt->extra_msr = get_msr(cnt->cpu, extra_msr_offset); 467 } 468 } 469 470 void print_nehalem_info(void) 471 { 472 unsigned long long msr; 473 unsigned int ratio; 474 475 if (!do_nehalem_platform_info) 476 return; 477 478 msr = get_msr(0, MSR_NEHALEM_PLATFORM_INFO); 479 480 ratio = (msr >> 40) & 0xFF; 481 fprintf(stderr, "%d * %.0f = %.0f MHz max efficiency\n", 482 ratio, bclk, ratio * bclk); 483 484 ratio = (msr >> 8) & 0xFF; 485 fprintf(stderr, "%d * %.0f = %.0f MHz TSC frequency\n", 486 ratio, bclk, ratio * bclk); 487 488 if (verbose > 1) 489 fprintf(stderr, "MSR_NEHALEM_PLATFORM_INFO: 0x%llx\n", msr); 490 491 if (!do_nehalem_turbo_ratio_limit) 492 return; 493 494 msr = get_msr(0, MSR_NEHALEM_TURBO_RATIO_LIMIT); 495 496 ratio = (msr >> 24) & 0xFF; 497 if (ratio) 498 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 4 active cores\n", 499 ratio, bclk, ratio * bclk); 500 501 ratio = (msr >> 16) & 0xFF; 502 if (ratio) 503 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 3 active cores\n", 504 ratio, bclk, ratio * bclk); 505 506 ratio = (msr >> 8) & 0xFF; 507 if (ratio) 508 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 2 active cores\n", 509 ratio, bclk, ratio * bclk); 510 511 ratio = (msr >> 0) & 0xFF; 512 if (ratio) 513 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 1 active cores\n", 514 ratio, bclk, ratio * bclk); 515 516 } 517 518 void free_counter_list(struct counters *list) 519 { 520 struct counters *p; 521 522 for (p = list; p; ) { 523 struct counters *free_me; 524 525 free_me = p; 526 p = p->next; 527 free(free_me); 528 } 529 } 530 531 void free_all_counters(void) 532 { 533 free_counter_list(cnt_even); 534 cnt_even = NULL; 535 536 free_counter_list(cnt_odd); 537 cnt_odd = NULL; 538 539 free_counter_list(cnt_delta); 540 cnt_delta = NULL; 541 542 free_counter_list(cnt_average); 543 cnt_average = NULL; 544 } 545 546 void insert_counters(struct counters **list, 547 struct counters *new) 548 { 549 struct counters *prev; 550 551 /* 552 * list was empty 553 */ 554 if (*list == NULL) { 555 new->next = *list; 556 *list = new; 557 return; 558 } 559 560 show_cpu = 1; /* there is more than one CPU */ 561 562 /* 563 * insert on front of list. 564 * It is sorted by ascending package#, core#, cpu# 565 */ 566 if (((*list)->pkg > new->pkg) || 567 (((*list)->pkg == new->pkg) && ((*list)->core > new->core)) || 568 (((*list)->pkg == new->pkg) && ((*list)->core == new->core) && ((*list)->cpu > new->cpu))) { 569 new->next = *list; 570 *list = new; 571 return; 572 } 573 574 prev = *list; 575 576 while (prev->next && (prev->next->pkg < new->pkg)) { 577 prev = prev->next; 578 show_pkg = 1; /* there is more than 1 package */ 579 } 580 581 while (prev->next && (prev->next->pkg == new->pkg) 582 && (prev->next->core < new->core)) { 583 prev = prev->next; 584 show_core = 1; /* there is more than 1 core */ 585 } 586 587 while (prev->next && (prev->next->pkg == new->pkg) 588 && (prev->next->core == new->core) 589 && (prev->next->cpu < new->cpu)) { 590 prev = prev->next; 591 } 592 593 /* 594 * insert after "prev" 595 */ 596 new->next = prev->next; 597 prev->next = new; 598 } 599 600 void alloc_new_counters(int pkg, int core, int cpu) 601 { 602 struct counters *new; 603 604 if (verbose > 1) 605 printf("pkg%d core%d, cpu%d\n", pkg, core, cpu); 606 607 new = (struct counters *)calloc(1, sizeof(struct counters)); 608 if (new == NULL) { 609 perror("calloc"); 610 exit(1); 611 } 612 new->pkg = pkg; 613 new->core = core; 614 new->cpu = cpu; 615 insert_counters(&cnt_odd, new); 616 617 new = (struct counters *)calloc(1, 618 sizeof(struct counters)); 619 if (new == NULL) { 620 perror("calloc"); 621 exit(1); 622 } 623 new->pkg = pkg; 624 new->core = core; 625 new->cpu = cpu; 626 insert_counters(&cnt_even, new); 627 628 new = (struct counters *)calloc(1, sizeof(struct counters)); 629 if (new == NULL) { 630 perror("calloc"); 631 exit(1); 632 } 633 new->pkg = pkg; 634 new->core = core; 635 new->cpu = cpu; 636 insert_counters(&cnt_delta, new); 637 638 new = (struct counters *)calloc(1, sizeof(struct counters)); 639 if (new == NULL) { 640 perror("calloc"); 641 exit(1); 642 } 643 new->pkg = pkg; 644 new->core = core; 645 new->cpu = cpu; 646 cnt_average = new; 647 } 648 649 int get_physical_package_id(int cpu) 650 { 651 char path[64]; 652 FILE *filep; 653 int pkg; 654 655 sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu); 656 filep = fopen(path, "r"); 657 if (filep == NULL) { 658 perror(path); 659 exit(1); 660 } 661 fscanf(filep, "%d", &pkg); 662 fclose(filep); 663 return pkg; 664 } 665 666 int get_core_id(int cpu) 667 { 668 char path[64]; 669 FILE *filep; 670 int core; 671 672 sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/core_id", cpu); 673 filep = fopen(path, "r"); 674 if (filep == NULL) { 675 perror(path); 676 exit(1); 677 } 678 fscanf(filep, "%d", &core); 679 fclose(filep); 680 return core; 681 } 682 683 /* 684 * run func(index, cpu) on every cpu in /proc/stat 685 */ 686 687 int for_all_cpus(void (func)(int, int, int)) 688 { 689 FILE *fp; 690 int cpu_count; 691 int retval; 692 693 fp = fopen(proc_stat, "r"); 694 if (fp == NULL) { 695 perror(proc_stat); 696 exit(1); 697 } 698 699 retval = fscanf(fp, "cpu %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n"); 700 if (retval != 0) { 701 perror("/proc/stat format"); 702 exit(1); 703 } 704 705 for (cpu_count = 0; ; cpu_count++) { 706 int cpu; 707 708 retval = fscanf(fp, "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n", &cpu); 709 if (retval != 1) 710 break; 711 712 func(get_physical_package_id(cpu), get_core_id(cpu), cpu); 713 } 714 fclose(fp); 715 return cpu_count; 716 } 717 718 void re_initialize(void) 719 { 720 printf("turbostat: topology changed, re-initializing.\n"); 721 free_all_counters(); 722 num_cpus = for_all_cpus(alloc_new_counters); 723 need_reinitialize = 0; 724 printf("num_cpus is now %d\n", num_cpus); 725 } 726 727 void dummy(int pkg, int core, int cpu) { return; } 728 /* 729 * check to see if a cpu came on-line 730 */ 731 void verify_num_cpus(void) 732 { 733 int new_num_cpus; 734 735 new_num_cpus = for_all_cpus(dummy); 736 737 if (new_num_cpus != num_cpus) { 738 if (verbose) 739 printf("num_cpus was %d, is now %d\n", 740 num_cpus, new_num_cpus); 741 need_reinitialize = 1; 742 } 743 } 744 745 void turbostat_loop() 746 { 747 restart: 748 get_counters(cnt_even); 749 gettimeofday(&tv_even, (struct timezone *)NULL); 750 751 while (1) { 752 verify_num_cpus(); 753 if (need_reinitialize) { 754 re_initialize(); 755 goto restart; 756 } 757 sleep(interval_sec); 758 get_counters(cnt_odd); 759 gettimeofday(&tv_odd, (struct timezone *)NULL); 760 761 compute_delta(cnt_odd, cnt_even, cnt_delta); 762 timersub(&tv_odd, &tv_even, &tv_delta); 763 compute_average(cnt_delta, cnt_average); 764 print_counters(cnt_delta); 765 if (need_reinitialize) { 766 re_initialize(); 767 goto restart; 768 } 769 sleep(interval_sec); 770 get_counters(cnt_even); 771 gettimeofday(&tv_even, (struct timezone *)NULL); 772 compute_delta(cnt_even, cnt_odd, cnt_delta); 773 timersub(&tv_even, &tv_odd, &tv_delta); 774 compute_average(cnt_delta, cnt_average); 775 print_counters(cnt_delta); 776 } 777 } 778 779 void check_dev_msr() 780 { 781 struct stat sb; 782 783 if (stat("/dev/cpu/0/msr", &sb)) { 784 fprintf(stderr, "no /dev/cpu/0/msr\n"); 785 fprintf(stderr, "Try \"# modprobe msr\"\n"); 786 exit(-5); 787 } 788 } 789 790 void check_super_user() 791 { 792 if (getuid() != 0) { 793 fprintf(stderr, "must be root\n"); 794 exit(-6); 795 } 796 } 797 798 int has_nehalem_turbo_ratio_limit(unsigned int family, unsigned int model) 799 { 800 if (!genuine_intel) 801 return 0; 802 803 if (family != 6) 804 return 0; 805 806 switch (model) { 807 case 0x1A: /* Core i7, Xeon 5500 series - Bloomfield, Gainstown NHM-EP */ 808 case 0x1E: /* Core i7 and i5 Processor - Clarksfield, Lynnfield, Jasper Forest */ 809 case 0x1F: /* Core i7 and i5 Processor - Nehalem */ 810 case 0x25: /* Westmere Client - Clarkdale, Arrandale */ 811 case 0x2C: /* Westmere EP - Gulftown */ 812 case 0x2A: /* SNB */ 813 case 0x2D: /* SNB Xeon */ 814 return 1; 815 case 0x2E: /* Nehalem-EX Xeon - Beckton */ 816 case 0x2F: /* Westmere-EX Xeon - Eagleton */ 817 default: 818 return 0; 819 } 820 } 821 822 int is_snb(unsigned int family, unsigned int model) 823 { 824 if (!genuine_intel) 825 return 0; 826 827 switch (model) { 828 case 0x2A: 829 case 0x2D: 830 return 1; 831 } 832 return 0; 833 } 834 835 double discover_bclk(unsigned int family, unsigned int model) 836 { 837 if (is_snb(family, model)) 838 return 100.00; 839 else 840 return 133.33; 841 } 842 843 void check_cpuid() 844 { 845 unsigned int eax, ebx, ecx, edx, max_level; 846 unsigned int fms, family, model, stepping; 847 848 eax = ebx = ecx = edx = 0; 849 850 asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0)); 851 852 if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e) 853 genuine_intel = 1; 854 855 if (verbose) 856 fprintf(stderr, "%.4s%.4s%.4s ", 857 (char *)&ebx, (char *)&edx, (char *)&ecx); 858 859 asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx"); 860 family = (fms >> 8) & 0xf; 861 model = (fms >> 4) & 0xf; 862 stepping = fms & 0xf; 863 if (family == 6 || family == 0xf) 864 model += ((fms >> 16) & 0xf) << 4; 865 866 if (verbose) 867 fprintf(stderr, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n", 868 max_level, family, model, stepping, family, model, stepping); 869 870 if (!(edx & (1 << 5))) { 871 fprintf(stderr, "CPUID: no MSR\n"); 872 exit(1); 873 } 874 875 /* 876 * check max extended function levels of CPUID. 877 * This is needed to check for invariant TSC. 878 * This check is valid for both Intel and AMD. 879 */ 880 ebx = ecx = edx = 0; 881 asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000000)); 882 883 if (max_level < 0x80000007) { 884 fprintf(stderr, "CPUID: no invariant TSC (max_level 0x%x)\n", max_level); 885 exit(1); 886 } 887 888 /* 889 * Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8 890 * this check is valid for both Intel and AMD 891 */ 892 asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000007)); 893 has_invariant_tsc = edx & (1 << 8); 894 895 if (!has_invariant_tsc) { 896 fprintf(stderr, "No invariant TSC\n"); 897 exit(1); 898 } 899 900 /* 901 * APERF/MPERF is advertised by CPUID.EAX=0x6: ECX.bit0 902 * this check is valid for both Intel and AMD 903 */ 904 905 asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x6)); 906 has_aperf = ecx & (1 << 0); 907 if (!has_aperf) { 908 fprintf(stderr, "No APERF MSR\n"); 909 exit(1); 910 } 911 912 do_nehalem_platform_info = genuine_intel && has_invariant_tsc; 913 do_nhm_cstates = genuine_intel; /* all Intel w/ non-stop TSC have NHM counters */ 914 do_snb_cstates = is_snb(family, model); 915 bclk = discover_bclk(family, model); 916 917 do_nehalem_turbo_ratio_limit = has_nehalem_turbo_ratio_limit(family, model); 918 } 919 920 921 void usage() 922 { 923 fprintf(stderr, "%s: [-v] [-M MSR#] [-i interval_sec | command ...]\n", 924 progname); 925 exit(1); 926 } 927 928 929 /* 930 * in /dev/cpu/ return success for names that are numbers 931 * ie. filter out ".", "..", "microcode". 932 */ 933 int dir_filter(const struct dirent *dirp) 934 { 935 if (isdigit(dirp->d_name[0])) 936 return 1; 937 else 938 return 0; 939 } 940 941 int open_dev_cpu_msr(int dummy1) 942 { 943 return 0; 944 } 945 946 void turbostat_init() 947 { 948 check_cpuid(); 949 950 check_dev_msr(); 951 check_super_user(); 952 953 num_cpus = for_all_cpus(alloc_new_counters); 954 955 if (verbose) 956 print_nehalem_info(); 957 } 958 959 int fork_it(char **argv) 960 { 961 int retval; 962 pid_t child_pid; 963 get_counters(cnt_even); 964 gettimeofday(&tv_even, (struct timezone *)NULL); 965 966 child_pid = fork(); 967 if (!child_pid) { 968 /* child */ 969 execvp(argv[0], argv); 970 } else { 971 int status; 972 973 /* parent */ 974 if (child_pid == -1) { 975 perror("fork"); 976 exit(1); 977 } 978 979 signal(SIGINT, SIG_IGN); 980 signal(SIGQUIT, SIG_IGN); 981 if (waitpid(child_pid, &status, 0) == -1) { 982 perror("wait"); 983 exit(1); 984 } 985 } 986 get_counters(cnt_odd); 987 gettimeofday(&tv_odd, (struct timezone *)NULL); 988 retval = compute_delta(cnt_odd, cnt_even, cnt_delta); 989 990 timersub(&tv_odd, &tv_even, &tv_delta); 991 compute_average(cnt_delta, cnt_average); 992 if (!retval) 993 print_counters(cnt_delta); 994 995 fprintf(stderr, "%.6f sec\n", tv_delta.tv_sec + tv_delta.tv_usec/1000000.0); 996 997 return 0; 998 } 999 1000 void cmdline(int argc, char **argv) 1001 { 1002 int opt; 1003 1004 progname = argv[0]; 1005 1006 while ((opt = getopt(argc, argv, "+vi:M:")) != -1) { 1007 switch (opt) { 1008 case 'v': 1009 verbose++; 1010 break; 1011 case 'i': 1012 interval_sec = atoi(optarg); 1013 break; 1014 case 'M': 1015 sscanf(optarg, "%x", &extra_msr_offset); 1016 if (verbose > 1) 1017 fprintf(stderr, "MSR 0x%X\n", extra_msr_offset); 1018 break; 1019 default: 1020 usage(); 1021 } 1022 } 1023 } 1024 1025 int main(int argc, char **argv) 1026 { 1027 cmdline(argc, argv); 1028 1029 if (verbose > 1) 1030 fprintf(stderr, "turbostat Dec 6, 2010" 1031 " - Len Brown <lenb@kernel.org>\n"); 1032 if (verbose > 1) 1033 fprintf(stderr, "http://userweb.kernel.org/~lenb/acpi/utils/pmtools/turbostat/\n"); 1034 1035 turbostat_init(); 1036 1037 /* 1038 * if any params left, it must be a command to fork 1039 */ 1040 if (argc - optind) 1041 return fork_it(argv + optind); 1042 else 1043 turbostat_loop(); 1044 1045 return 0; 1046 } 1047