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TOMOYO Linux Cross Reference
Linux/tools/power/x86/turbostat/turbostat.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 

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