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