perf stat: Add noise output for csv mode
[linux-2.6.git] / tools / perf / builtin-stat.c
1 /*
2  * builtin-stat.c
3  *
4  * Builtin stat command: Give a precise performance counters summary
5  * overview about any workload, CPU or specific PID.
6  *
7  * Sample output:
8
9    $ perf stat ./hackbench 10
10
11   Time: 0.118
12
13   Performance counter stats for './hackbench 10':
14
15        1708.761321 task-clock                #   11.037 CPUs utilized
16             41,190 context-switches          #    0.024 M/sec
17              6,735 CPU-migrations            #    0.004 M/sec
18             17,318 page-faults               #    0.010 M/sec
19      5,205,202,243 cycles                    #    3.046 GHz
20      3,856,436,920 stalled-cycles-frontend   #   74.09% frontend cycles idle
21      1,600,790,871 stalled-cycles-backend    #   30.75% backend  cycles idle
22      2,603,501,247 instructions              #    0.50  insns per cycle
23                                              #    1.48  stalled cycles per insn
24        484,357,498 branches                  #  283.455 M/sec
25          6,388,934 branch-misses             #    1.32% of all branches
26
27         0.154822978  seconds time elapsed
28
29  *
30  * Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
31  *
32  * Improvements and fixes by:
33  *
34  *   Arjan van de Ven <arjan@linux.intel.com>
35  *   Yanmin Zhang <yanmin.zhang@intel.com>
36  *   Wu Fengguang <fengguang.wu@intel.com>
37  *   Mike Galbraith <efault@gmx.de>
38  *   Paul Mackerras <paulus@samba.org>
39  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
40  *
41  * Released under the GPL v2. (and only v2, not any later version)
42  */
43
44 #include "perf.h"
45 #include "builtin.h"
46 #include "util/util.h"
47 #include "util/parse-options.h"
48 #include "util/parse-events.h"
49 #include "util/event.h"
50 #include "util/evlist.h"
51 #include "util/evsel.h"
52 #include "util/debug.h"
53 #include "util/color.h"
54 #include "util/header.h"
55 #include "util/cpumap.h"
56 #include "util/thread.h"
57 #include "util/thread_map.h"
58
59 #include <sys/prctl.h>
60 #include <math.h>
61 #include <locale.h>
62
63 #define DEFAULT_SEPARATOR       " "
64 #define CNTR_NOT_SUPPORTED      "<not supported>"
65 #define CNTR_NOT_COUNTED        "<not counted>"
66
67 static struct perf_event_attr default_attrs[] = {
68
69   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
70   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
71   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
72   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
73
74   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
75   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
76   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
77   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
78   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
79   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
80
81 };
82
83 /*
84  * Detailed stats (-d), covering the L1 and last level data caches:
85  */
86 static struct perf_event_attr detailed_attrs[] = {
87
88   { .type = PERF_TYPE_HW_CACHE,
89     .config =
90          PERF_COUNT_HW_CACHE_L1D                <<  0  |
91         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
92         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
93
94   { .type = PERF_TYPE_HW_CACHE,
95     .config =
96          PERF_COUNT_HW_CACHE_L1D                <<  0  |
97         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
98         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
99
100   { .type = PERF_TYPE_HW_CACHE,
101     .config =
102          PERF_COUNT_HW_CACHE_LL                 <<  0  |
103         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
104         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
105
106   { .type = PERF_TYPE_HW_CACHE,
107     .config =
108          PERF_COUNT_HW_CACHE_LL                 <<  0  |
109         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
110         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
111 };
112
113 /*
114  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
115  */
116 static struct perf_event_attr very_detailed_attrs[] = {
117
118   { .type = PERF_TYPE_HW_CACHE,
119     .config =
120          PERF_COUNT_HW_CACHE_L1I                <<  0  |
121         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
122         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
123
124   { .type = PERF_TYPE_HW_CACHE,
125     .config =
126          PERF_COUNT_HW_CACHE_L1I                <<  0  |
127         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
128         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
129
130   { .type = PERF_TYPE_HW_CACHE,
131     .config =
132          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
133         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
134         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
135
136   { .type = PERF_TYPE_HW_CACHE,
137     .config =
138          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
139         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
140         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
141
142   { .type = PERF_TYPE_HW_CACHE,
143     .config =
144          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
145         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
146         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
147
148   { .type = PERF_TYPE_HW_CACHE,
149     .config =
150          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
151         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
152         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
153
154 };
155
156 /*
157  * Very, very detailed stats (-d -d -d), adding prefetch events:
158  */
159 static struct perf_event_attr very_very_detailed_attrs[] = {
160
161   { .type = PERF_TYPE_HW_CACHE,
162     .config =
163          PERF_COUNT_HW_CACHE_L1D                <<  0  |
164         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
165         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
166
167   { .type = PERF_TYPE_HW_CACHE,
168     .config =
169          PERF_COUNT_HW_CACHE_L1D                <<  0  |
170         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
171         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
172 };
173
174
175
176 struct perf_evlist              *evsel_list;
177
178 static bool                     system_wide                     =  false;
179 static int                      run_idx                         =  0;
180
181 static int                      run_count                       =  1;
182 static bool                     no_inherit                      = false;
183 static bool                     scale                           =  true;
184 static bool                     no_aggr                         = false;
185 static pid_t                    target_pid                      = -1;
186 static pid_t                    target_tid                      = -1;
187 static pid_t                    child_pid                       = -1;
188 static bool                     null_run                        =  false;
189 static int                      detailed_run                    =  0;
190 static bool                     sync_run                        =  false;
191 static bool                     big_num                         =  true;
192 static int                      big_num_opt                     =  -1;
193 static const char               *cpu_list;
194 static const char               *csv_sep                        = NULL;
195 static bool                     csv_output                      = false;
196
197 static volatile int done = 0;
198
199 struct stats
200 {
201         double n, mean, M2;
202 };
203
204 struct perf_stat {
205         struct stats      res_stats[3];
206 };
207
208 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
209 {
210         evsel->priv = zalloc(sizeof(struct perf_stat));
211         return evsel->priv == NULL ? -ENOMEM : 0;
212 }
213
214 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
215 {
216         free(evsel->priv);
217         evsel->priv = NULL;
218 }
219
220 static void update_stats(struct stats *stats, u64 val)
221 {
222         double delta;
223
224         stats->n++;
225         delta = val - stats->mean;
226         stats->mean += delta / stats->n;
227         stats->M2 += delta*(val - stats->mean);
228 }
229
230 static double avg_stats(struct stats *stats)
231 {
232         return stats->mean;
233 }
234
235 /*
236  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
237  *
238  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
239  * s^2 = -------------------------------
240  *                  n - 1
241  *
242  * http://en.wikipedia.org/wiki/Stddev
243  *
244  * The std dev of the mean is related to the std dev by:
245  *
246  *             s
247  * s_mean = -------
248  *          sqrt(n)
249  *
250  */
251 static double stddev_stats(struct stats *stats)
252 {
253         double variance = stats->M2 / (stats->n - 1);
254         double variance_mean = variance / stats->n;
255
256         return sqrt(variance_mean);
257 }
258
259 struct stats                    runtime_nsecs_stats[MAX_NR_CPUS];
260 struct stats                    runtime_cycles_stats[MAX_NR_CPUS];
261 struct stats                    runtime_stalled_cycles_front_stats[MAX_NR_CPUS];
262 struct stats                    runtime_stalled_cycles_back_stats[MAX_NR_CPUS];
263 struct stats                    runtime_branches_stats[MAX_NR_CPUS];
264 struct stats                    runtime_cacherefs_stats[MAX_NR_CPUS];
265 struct stats                    runtime_l1_dcache_stats[MAX_NR_CPUS];
266 struct stats                    runtime_l1_icache_stats[MAX_NR_CPUS];
267 struct stats                    runtime_ll_cache_stats[MAX_NR_CPUS];
268 struct stats                    runtime_itlb_cache_stats[MAX_NR_CPUS];
269 struct stats                    runtime_dtlb_cache_stats[MAX_NR_CPUS];
270 struct stats                    walltime_nsecs_stats;
271
272 static int create_perf_stat_counter(struct perf_evsel *evsel)
273 {
274         struct perf_event_attr *attr = &evsel->attr;
275
276         if (scale)
277                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
278                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
279
280         attr->inherit = !no_inherit;
281
282         if (system_wide)
283                 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false);
284
285         if (target_pid == -1 && target_tid == -1) {
286                 attr->disabled = 1;
287                 attr->enable_on_exec = 1;
288         }
289
290         return perf_evsel__open_per_thread(evsel, evsel_list->threads, false);
291 }
292
293 /*
294  * Does the counter have nsecs as a unit?
295  */
296 static inline int nsec_counter(struct perf_evsel *evsel)
297 {
298         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
299             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
300                 return 1;
301
302         return 0;
303 }
304
305 /*
306  * Update various tracking values we maintain to print
307  * more semantic information such as miss/hit ratios,
308  * instruction rates, etc:
309  */
310 static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
311 {
312         if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
313                 update_stats(&runtime_nsecs_stats[0], count[0]);
314         else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
315                 update_stats(&runtime_cycles_stats[0], count[0]);
316         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
317                 update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
318         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
319                 update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
320         else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
321                 update_stats(&runtime_branches_stats[0], count[0]);
322         else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES))
323                 update_stats(&runtime_cacherefs_stats[0], count[0]);
324         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D))
325                 update_stats(&runtime_l1_dcache_stats[0], count[0]);
326         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1I))
327                 update_stats(&runtime_l1_icache_stats[0], count[0]);
328         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_LL))
329                 update_stats(&runtime_ll_cache_stats[0], count[0]);
330         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_DTLB))
331                 update_stats(&runtime_dtlb_cache_stats[0], count[0]);
332         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_ITLB))
333                 update_stats(&runtime_itlb_cache_stats[0], count[0]);
334 }
335
336 /*
337  * Read out the results of a single counter:
338  * aggregate counts across CPUs in system-wide mode
339  */
340 static int read_counter_aggr(struct perf_evsel *counter)
341 {
342         struct perf_stat *ps = counter->priv;
343         u64 *count = counter->counts->aggr.values;
344         int i;
345
346         if (__perf_evsel__read(counter, evsel_list->cpus->nr,
347                                evsel_list->threads->nr, scale) < 0)
348                 return -1;
349
350         for (i = 0; i < 3; i++)
351                 update_stats(&ps->res_stats[i], count[i]);
352
353         if (verbose) {
354                 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
355                         event_name(counter), count[0], count[1], count[2]);
356         }
357
358         /*
359          * Save the full runtime - to allow normalization during printout:
360          */
361         update_shadow_stats(counter, count);
362
363         return 0;
364 }
365
366 /*
367  * Read out the results of a single counter:
368  * do not aggregate counts across CPUs in system-wide mode
369  */
370 static int read_counter(struct perf_evsel *counter)
371 {
372         u64 *count;
373         int cpu;
374
375         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
376                 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
377                         return -1;
378
379                 count = counter->counts->cpu[cpu].values;
380
381                 update_shadow_stats(counter, count);
382         }
383
384         return 0;
385 }
386
387 static int run_perf_stat(int argc __used, const char **argv)
388 {
389         unsigned long long t0, t1;
390         struct perf_evsel *counter;
391         int status = 0;
392         int child_ready_pipe[2], go_pipe[2];
393         const bool forks = (argc > 0);
394         char buf;
395
396         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
397                 perror("failed to create pipes");
398                 exit(1);
399         }
400
401         if (forks) {
402                 if ((child_pid = fork()) < 0)
403                         perror("failed to fork");
404
405                 if (!child_pid) {
406                         close(child_ready_pipe[0]);
407                         close(go_pipe[1]);
408                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
409
410                         /*
411                          * Do a dummy execvp to get the PLT entry resolved,
412                          * so we avoid the resolver overhead on the real
413                          * execvp call.
414                          */
415                         execvp("", (char **)argv);
416
417                         /*
418                          * Tell the parent we're ready to go
419                          */
420                         close(child_ready_pipe[1]);
421
422                         /*
423                          * Wait until the parent tells us to go.
424                          */
425                         if (read(go_pipe[0], &buf, 1) == -1)
426                                 perror("unable to read pipe");
427
428                         execvp(argv[0], (char **)argv);
429
430                         perror(argv[0]);
431                         exit(-1);
432                 }
433
434                 if (target_tid == -1 && target_pid == -1 && !system_wide)
435                         evsel_list->threads->map[0] = child_pid;
436
437                 /*
438                  * Wait for the child to be ready to exec.
439                  */
440                 close(child_ready_pipe[1]);
441                 close(go_pipe[0]);
442                 if (read(child_ready_pipe[0], &buf, 1) == -1)
443                         perror("unable to read pipe");
444                 close(child_ready_pipe[0]);
445         }
446
447         list_for_each_entry(counter, &evsel_list->entries, node) {
448                 if (create_perf_stat_counter(counter) < 0) {
449                         if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
450                                 if (verbose)
451                                         ui__warning("%s event is not supported by the kernel.\n",
452                                                     event_name(counter));
453                                 counter->supported = false;
454                                 continue;
455                         }
456
457                         if (errno == EPERM || errno == EACCES) {
458                                 error("You may not have permission to collect %sstats.\n"
459                                       "\t Consider tweaking"
460                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
461                                       system_wide ? "system-wide " : "");
462                         } else {
463                                 error("open_counter returned with %d (%s). "
464                                       "/bin/dmesg may provide additional information.\n",
465                                        errno, strerror(errno));
466                         }
467                         if (child_pid != -1)
468                                 kill(child_pid, SIGTERM);
469                         die("Not all events could be opened.\n");
470                         return -1;
471                 }
472                 counter->supported = true;
473         }
474
475         if (perf_evlist__set_filters(evsel_list)) {
476                 error("failed to set filter with %d (%s)\n", errno,
477                         strerror(errno));
478                 return -1;
479         }
480
481         /*
482          * Enable counters and exec the command:
483          */
484         t0 = rdclock();
485
486         if (forks) {
487                 close(go_pipe[1]);
488                 wait(&status);
489         } else {
490                 while(!done) sleep(1);
491         }
492
493         t1 = rdclock();
494
495         update_stats(&walltime_nsecs_stats, t1 - t0);
496
497         if (no_aggr) {
498                 list_for_each_entry(counter, &evsel_list->entries, node) {
499                         read_counter(counter);
500                         perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
501                 }
502         } else {
503                 list_for_each_entry(counter, &evsel_list->entries, node) {
504                         read_counter_aggr(counter);
505                         perf_evsel__close_fd(counter, evsel_list->cpus->nr,
506                                              evsel_list->threads->nr);
507                 }
508         }
509
510         return WEXITSTATUS(status);
511 }
512
513 static void print_noise_pct(double total, double avg)
514 {
515         double pct = 0.0;
516
517         if (avg)
518                 pct = 100.0*total/avg;
519
520         if (csv_output)
521                 fprintf(stderr, "%s%.2f%%", csv_sep, pct);
522         else
523                 fprintf(stderr, "  ( +-%6.2f%% )", pct);
524 }
525
526 static void print_noise(struct perf_evsel *evsel, double avg)
527 {
528         struct perf_stat *ps;
529
530         if (run_count == 1)
531                 return;
532
533         ps = evsel->priv;
534         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
535 }
536
537 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
538 {
539         double msecs = avg / 1e6;
540         char cpustr[16] = { '\0', };
541         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-25s";
542
543         if (no_aggr)
544                 sprintf(cpustr, "CPU%*d%s",
545                         csv_output ? 0 : -4,
546                         evsel_list->cpus->map[cpu], csv_sep);
547
548         fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
549
550         if (evsel->cgrp)
551                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
552
553         if (csv_output)
554                 return;
555
556         if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
557                 fprintf(stderr, " # %8.3f CPUs utilized          ", avg / avg_stats(&walltime_nsecs_stats));
558 }
559
560 static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __used, double avg)
561 {
562         double total, ratio = 0.0;
563         const char *color;
564
565         total = avg_stats(&runtime_cycles_stats[cpu]);
566
567         if (total)
568                 ratio = avg / total * 100.0;
569
570         color = PERF_COLOR_NORMAL;
571         if (ratio > 50.0)
572                 color = PERF_COLOR_RED;
573         else if (ratio > 30.0)
574                 color = PERF_COLOR_MAGENTA;
575         else if (ratio > 10.0)
576                 color = PERF_COLOR_YELLOW;
577
578         fprintf(stderr, " #  ");
579         color_fprintf(stderr, color, "%6.2f%%", ratio);
580         fprintf(stderr, " frontend cycles idle   ");
581 }
582
583 static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __used, double avg)
584 {
585         double total, ratio = 0.0;
586         const char *color;
587
588         total = avg_stats(&runtime_cycles_stats[cpu]);
589
590         if (total)
591                 ratio = avg / total * 100.0;
592
593         color = PERF_COLOR_NORMAL;
594         if (ratio > 75.0)
595                 color = PERF_COLOR_RED;
596         else if (ratio > 50.0)
597                 color = PERF_COLOR_MAGENTA;
598         else if (ratio > 20.0)
599                 color = PERF_COLOR_YELLOW;
600
601         fprintf(stderr, " #  ");
602         color_fprintf(stderr, color, "%6.2f%%", ratio);
603         fprintf(stderr, " backend  cycles idle   ");
604 }
605
606 static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
607 {
608         double total, ratio = 0.0;
609         const char *color;
610
611         total = avg_stats(&runtime_branches_stats[cpu]);
612
613         if (total)
614                 ratio = avg / total * 100.0;
615
616         color = PERF_COLOR_NORMAL;
617         if (ratio > 20.0)
618                 color = PERF_COLOR_RED;
619         else if (ratio > 10.0)
620                 color = PERF_COLOR_MAGENTA;
621         else if (ratio > 5.0)
622                 color = PERF_COLOR_YELLOW;
623
624         fprintf(stderr, " #  ");
625         color_fprintf(stderr, color, "%6.2f%%", ratio);
626         fprintf(stderr, " of all branches        ");
627 }
628
629 static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
630 {
631         double total, ratio = 0.0;
632         const char *color;
633
634         total = avg_stats(&runtime_l1_dcache_stats[cpu]);
635
636         if (total)
637                 ratio = avg / total * 100.0;
638
639         color = PERF_COLOR_NORMAL;
640         if (ratio > 20.0)
641                 color = PERF_COLOR_RED;
642         else if (ratio > 10.0)
643                 color = PERF_COLOR_MAGENTA;
644         else if (ratio > 5.0)
645                 color = PERF_COLOR_YELLOW;
646
647         fprintf(stderr, " #  ");
648         color_fprintf(stderr, color, "%6.2f%%", ratio);
649         fprintf(stderr, " of all L1-dcache hits  ");
650 }
651
652 static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
653 {
654         double total, ratio = 0.0;
655         const char *color;
656
657         total = avg_stats(&runtime_l1_icache_stats[cpu]);
658
659         if (total)
660                 ratio = avg / total * 100.0;
661
662         color = PERF_COLOR_NORMAL;
663         if (ratio > 20.0)
664                 color = PERF_COLOR_RED;
665         else if (ratio > 10.0)
666                 color = PERF_COLOR_MAGENTA;
667         else if (ratio > 5.0)
668                 color = PERF_COLOR_YELLOW;
669
670         fprintf(stderr, " #  ");
671         color_fprintf(stderr, color, "%6.2f%%", ratio);
672         fprintf(stderr, " of all L1-icache hits  ");
673 }
674
675 static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
676 {
677         double total, ratio = 0.0;
678         const char *color;
679
680         total = avg_stats(&runtime_dtlb_cache_stats[cpu]);
681
682         if (total)
683                 ratio = avg / total * 100.0;
684
685         color = PERF_COLOR_NORMAL;
686         if (ratio > 20.0)
687                 color = PERF_COLOR_RED;
688         else if (ratio > 10.0)
689                 color = PERF_COLOR_MAGENTA;
690         else if (ratio > 5.0)
691                 color = PERF_COLOR_YELLOW;
692
693         fprintf(stderr, " #  ");
694         color_fprintf(stderr, color, "%6.2f%%", ratio);
695         fprintf(stderr, " of all dTLB cache hits ");
696 }
697
698 static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
699 {
700         double total, ratio = 0.0;
701         const char *color;
702
703         total = avg_stats(&runtime_itlb_cache_stats[cpu]);
704
705         if (total)
706                 ratio = avg / total * 100.0;
707
708         color = PERF_COLOR_NORMAL;
709         if (ratio > 20.0)
710                 color = PERF_COLOR_RED;
711         else if (ratio > 10.0)
712                 color = PERF_COLOR_MAGENTA;
713         else if (ratio > 5.0)
714                 color = PERF_COLOR_YELLOW;
715
716         fprintf(stderr, " #  ");
717         color_fprintf(stderr, color, "%6.2f%%", ratio);
718         fprintf(stderr, " of all iTLB cache hits ");
719 }
720
721 static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
722 {
723         double total, ratio = 0.0;
724         const char *color;
725
726         total = avg_stats(&runtime_ll_cache_stats[cpu]);
727
728         if (total)
729                 ratio = avg / total * 100.0;
730
731         color = PERF_COLOR_NORMAL;
732         if (ratio > 20.0)
733                 color = PERF_COLOR_RED;
734         else if (ratio > 10.0)
735                 color = PERF_COLOR_MAGENTA;
736         else if (ratio > 5.0)
737                 color = PERF_COLOR_YELLOW;
738
739         fprintf(stderr, " #  ");
740         color_fprintf(stderr, color, "%6.2f%%", ratio);
741         fprintf(stderr, " of all LL-cache hits   ");
742 }
743
744 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
745 {
746         double total, ratio = 0.0;
747         char cpustr[16] = { '\0', };
748         const char *fmt;
749
750         if (csv_output)
751                 fmt = "%s%.0f%s%s";
752         else if (big_num)
753                 fmt = "%s%'18.0f%s%-25s";
754         else
755                 fmt = "%s%18.0f%s%-25s";
756
757         if (no_aggr)
758                 sprintf(cpustr, "CPU%*d%s",
759                         csv_output ? 0 : -4,
760                         evsel_list->cpus->map[cpu], csv_sep);
761         else
762                 cpu = 0;
763
764         fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
765
766         if (evsel->cgrp)
767                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
768
769         if (csv_output)
770                 return;
771
772         if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
773                 total = avg_stats(&runtime_cycles_stats[cpu]);
774
775                 if (total)
776                         ratio = avg / total;
777
778                 fprintf(stderr, " #   %5.2f  insns per cycle        ", ratio);
779
780                 total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
781                 total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
782
783                 if (total && avg) {
784                         ratio = total / avg;
785                         fprintf(stderr, "\n                                             #   %5.2f  stalled cycles per insn", ratio);
786                 }
787
788         } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
789                         runtime_branches_stats[cpu].n != 0) {
790                 print_branch_misses(cpu, evsel, avg);
791         } else if (
792                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
793                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1D |
794                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
795                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
796                         runtime_l1_dcache_stats[cpu].n != 0) {
797                 print_l1_dcache_misses(cpu, evsel, avg);
798         } else if (
799                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
800                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |
801                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
802                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
803                         runtime_l1_icache_stats[cpu].n != 0) {
804                 print_l1_icache_misses(cpu, evsel, avg);
805         } else if (
806                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
807                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |
808                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
809                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
810                         runtime_dtlb_cache_stats[cpu].n != 0) {
811                 print_dtlb_cache_misses(cpu, evsel, avg);
812         } else if (
813                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
814                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |
815                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
816                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
817                         runtime_itlb_cache_stats[cpu].n != 0) {
818                 print_itlb_cache_misses(cpu, evsel, avg);
819         } else if (
820                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
821                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_LL |
822                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
823                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
824                         runtime_ll_cache_stats[cpu].n != 0) {
825                 print_ll_cache_misses(cpu, evsel, avg);
826         } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) &&
827                         runtime_cacherefs_stats[cpu].n != 0) {
828                 total = avg_stats(&runtime_cacherefs_stats[cpu]);
829
830                 if (total)
831                         ratio = avg * 100 / total;
832
833                 fprintf(stderr, " # %8.3f %% of all cache refs    ", ratio);
834
835         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
836                 print_stalled_cycles_frontend(cpu, evsel, avg);
837         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
838                 print_stalled_cycles_backend(cpu, evsel, avg);
839         } else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
840                 total = avg_stats(&runtime_nsecs_stats[cpu]);
841
842                 if (total)
843                         ratio = 1.0 * avg / total;
844
845                 fprintf(stderr, " # %8.3f GHz                    ", ratio);
846         } else if (runtime_nsecs_stats[cpu].n != 0) {
847                 total = avg_stats(&runtime_nsecs_stats[cpu]);
848
849                 if (total)
850                         ratio = 1000.0 * avg / total;
851
852                 fprintf(stderr, " # %8.3f M/sec                  ", ratio);
853         } else {
854                 fprintf(stderr, "                                   ");
855         }
856 }
857
858 /*
859  * Print out the results of a single counter:
860  * aggregated counts in system-wide mode
861  */
862 static void print_counter_aggr(struct perf_evsel *counter)
863 {
864         struct perf_stat *ps = counter->priv;
865         double avg = avg_stats(&ps->res_stats[0]);
866         int scaled = counter->counts->scaled;
867
868         if (scaled == -1) {
869                 fprintf(stderr, "%*s%s%*s",
870                         csv_output ? 0 : 18,
871                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
872                         csv_sep,
873                         csv_output ? 0 : -24,
874                         event_name(counter));
875
876                 if (counter->cgrp)
877                         fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
878
879                 fputc('\n', stderr);
880                 return;
881         }
882
883         if (nsec_counter(counter))
884                 nsec_printout(-1, counter, avg);
885         else
886                 abs_printout(-1, counter, avg);
887
888         print_noise(counter, avg);
889
890         if (csv_output) {
891                 fputc('\n', stderr);
892                 return;
893         }
894
895         if (scaled) {
896                 double avg_enabled, avg_running;
897
898                 avg_enabled = avg_stats(&ps->res_stats[1]);
899                 avg_running = avg_stats(&ps->res_stats[2]);
900
901                 fprintf(stderr, " [%5.2f%%]", 100 * avg_running / avg_enabled);
902         }
903         fprintf(stderr, "\n");
904 }
905
906 /*
907  * Print out the results of a single counter:
908  * does not use aggregated count in system-wide
909  */
910 static void print_counter(struct perf_evsel *counter)
911 {
912         u64 ena, run, val;
913         int cpu;
914
915         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
916                 val = counter->counts->cpu[cpu].val;
917                 ena = counter->counts->cpu[cpu].ena;
918                 run = counter->counts->cpu[cpu].run;
919                 if (run == 0 || ena == 0) {
920                         fprintf(stderr, "CPU%*d%s%*s%s%*s",
921                                 csv_output ? 0 : -4,
922                                 evsel_list->cpus->map[cpu], csv_sep,
923                                 csv_output ? 0 : 18,
924                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
925                                 csv_sep,
926                                 csv_output ? 0 : -24,
927                                 event_name(counter));
928
929                         if (counter->cgrp)
930                                 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
931
932                         fputc('\n', stderr);
933                         continue;
934                 }
935
936                 if (nsec_counter(counter))
937                         nsec_printout(cpu, counter, val);
938                 else
939                         abs_printout(cpu, counter, val);
940
941                 if (!csv_output) {
942                         print_noise(counter, 1.0);
943
944                         if (run != ena)
945                                 fprintf(stderr, "  (%.2f%%)", 100.0 * run / ena);
946                 }
947                 fputc('\n', stderr);
948         }
949 }
950
951 static void print_stat(int argc, const char **argv)
952 {
953         struct perf_evsel *counter;
954         int i;
955
956         fflush(stdout);
957
958         if (!csv_output) {
959                 fprintf(stderr, "\n");
960                 fprintf(stderr, " Performance counter stats for ");
961                 if(target_pid == -1 && target_tid == -1) {
962                         fprintf(stderr, "\'%s", argv[0]);
963                         for (i = 1; i < argc; i++)
964                                 fprintf(stderr, " %s", argv[i]);
965                 } else if (target_pid != -1)
966                         fprintf(stderr, "process id \'%d", target_pid);
967                 else
968                         fprintf(stderr, "thread id \'%d", target_tid);
969
970                 fprintf(stderr, "\'");
971                 if (run_count > 1)
972                         fprintf(stderr, " (%d runs)", run_count);
973                 fprintf(stderr, ":\n\n");
974         }
975
976         if (no_aggr) {
977                 list_for_each_entry(counter, &evsel_list->entries, node)
978                         print_counter(counter);
979         } else {
980                 list_for_each_entry(counter, &evsel_list->entries, node)
981                         print_counter_aggr(counter);
982         }
983
984         if (!csv_output) {
985                 if (!null_run)
986                         fprintf(stderr, "\n");
987                 fprintf(stderr, " %17.9f seconds time elapsed",
988                                 avg_stats(&walltime_nsecs_stats)/1e9);
989                 if (run_count > 1) {
990                         fprintf(stderr, "                                        ");
991                         print_noise_pct(stddev_stats(&walltime_nsecs_stats),
992                                         avg_stats(&walltime_nsecs_stats));
993                 }
994                 fprintf(stderr, "\n\n");
995         }
996 }
997
998 static volatile int signr = -1;
999
1000 static void skip_signal(int signo)
1001 {
1002         if(child_pid == -1)
1003                 done = 1;
1004
1005         signr = signo;
1006 }
1007
1008 static void sig_atexit(void)
1009 {
1010         if (child_pid != -1)
1011                 kill(child_pid, SIGTERM);
1012
1013         if (signr == -1)
1014                 return;
1015
1016         signal(signr, SIG_DFL);
1017         kill(getpid(), signr);
1018 }
1019
1020 static const char * const stat_usage[] = {
1021         "perf stat [<options>] [<command>]",
1022         NULL
1023 };
1024
1025 static int stat__set_big_num(const struct option *opt __used,
1026                              const char *s __used, int unset)
1027 {
1028         big_num_opt = unset ? 0 : 1;
1029         return 0;
1030 }
1031
1032 static const struct option options[] = {
1033         OPT_CALLBACK('e', "event", &evsel_list, "event",
1034                      "event selector. use 'perf list' to list available events",
1035                      parse_events),
1036         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1037                      "event filter", parse_filter),
1038         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1039                     "child tasks do not inherit counters"),
1040         OPT_INTEGER('p', "pid", &target_pid,
1041                     "stat events on existing process id"),
1042         OPT_INTEGER('t', "tid", &target_tid,
1043                     "stat events on existing thread id"),
1044         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1045                     "system-wide collection from all CPUs"),
1046         OPT_BOOLEAN('c', "scale", &scale,
1047                     "scale/normalize counters"),
1048         OPT_INCR('v', "verbose", &verbose,
1049                     "be more verbose (show counter open errors, etc)"),
1050         OPT_INTEGER('r', "repeat", &run_count,
1051                     "repeat command and print average + stddev (max: 100)"),
1052         OPT_BOOLEAN('n', "null", &null_run,
1053                     "null run - dont start any counters"),
1054         OPT_INCR('d', "detailed", &detailed_run,
1055                     "detailed run - start a lot of events"),
1056         OPT_BOOLEAN('S', "sync", &sync_run,
1057                     "call sync() before starting a run"),
1058         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL, 
1059                            "print large numbers with thousands\' separators",
1060                            stat__set_big_num),
1061         OPT_STRING('C', "cpu", &cpu_list, "cpu",
1062                     "list of cpus to monitor in system-wide"),
1063         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
1064                     "disable CPU count aggregation"),
1065         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1066                    "print counts with custom separator"),
1067         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1068                      "monitor event in cgroup name only",
1069                      parse_cgroups),
1070         OPT_END()
1071 };
1072
1073 /*
1074  * Add default attributes, if there were no attributes specified or
1075  * if -d/--detailed, -d -d or -d -d -d is used:
1076  */
1077 static int add_default_attributes(void)
1078 {
1079         struct perf_evsel *pos;
1080         size_t attr_nr = 0;
1081         size_t c;
1082
1083         /* Set attrs if no event is selected and !null_run: */
1084         if (null_run)
1085                 return 0;
1086
1087         if (!evsel_list->nr_entries) {
1088                 for (c = 0; c < ARRAY_SIZE(default_attrs); c++) {
1089                         pos = perf_evsel__new(default_attrs + c, c + attr_nr);
1090                         if (pos == NULL)
1091                                 return -1;
1092                         perf_evlist__add(evsel_list, pos);
1093                 }
1094                 attr_nr += c;
1095         }
1096
1097         /* Detailed events get appended to the event list: */
1098
1099         if (detailed_run <  1)
1100                 return 0;
1101
1102         /* Append detailed run extra attributes: */
1103         for (c = 0; c < ARRAY_SIZE(detailed_attrs); c++) {
1104                 pos = perf_evsel__new(detailed_attrs + c, c + attr_nr);
1105                 if (pos == NULL)
1106                         return -1;
1107                 perf_evlist__add(evsel_list, pos);
1108         }
1109         attr_nr += c;
1110
1111         if (detailed_run < 2)
1112                 return 0;
1113
1114         /* Append very detailed run extra attributes: */
1115         for (c = 0; c < ARRAY_SIZE(very_detailed_attrs); c++) {
1116                 pos = perf_evsel__new(very_detailed_attrs + c, c + attr_nr);
1117                 if (pos == NULL)
1118                         return -1;
1119                 perf_evlist__add(evsel_list, pos);
1120         }
1121
1122         if (detailed_run < 3)
1123                 return 0;
1124
1125         /* Append very, very detailed run extra attributes: */
1126         for (c = 0; c < ARRAY_SIZE(very_very_detailed_attrs); c++) {
1127                 pos = perf_evsel__new(very_very_detailed_attrs + c, c + attr_nr);
1128                 if (pos == NULL)
1129                         return -1;
1130                 perf_evlist__add(evsel_list, pos);
1131         }
1132
1133
1134         return 0;
1135 }
1136
1137 int cmd_stat(int argc, const char **argv, const char *prefix __used)
1138 {
1139         struct perf_evsel *pos;
1140         int status = -ENOMEM;
1141
1142         setlocale(LC_ALL, "");
1143
1144         evsel_list = perf_evlist__new(NULL, NULL);
1145         if (evsel_list == NULL)
1146                 return -ENOMEM;
1147
1148         argc = parse_options(argc, argv, options, stat_usage,
1149                 PARSE_OPT_STOP_AT_NON_OPTION);
1150
1151         if (csv_sep)
1152                 csv_output = true;
1153         else
1154                 csv_sep = DEFAULT_SEPARATOR;
1155
1156         /*
1157          * let the spreadsheet do the pretty-printing
1158          */
1159         if (csv_output) {
1160                 /* User explicitely passed -B? */
1161                 if (big_num_opt == 1) {
1162                         fprintf(stderr, "-B option not supported with -x\n");
1163                         usage_with_options(stat_usage, options);
1164                 } else /* Nope, so disable big number formatting */
1165                         big_num = false;
1166         } else if (big_num_opt == 0) /* User passed --no-big-num */
1167                 big_num = false;
1168
1169         if (!argc && target_pid == -1 && target_tid == -1)
1170                 usage_with_options(stat_usage, options);
1171         if (run_count <= 0)
1172                 usage_with_options(stat_usage, options);
1173
1174         /* no_aggr, cgroup are for system-wide only */
1175         if ((no_aggr || nr_cgroups) && !system_wide) {
1176                 fprintf(stderr, "both cgroup and no-aggregation "
1177                         "modes only available in system-wide mode\n");
1178
1179                 usage_with_options(stat_usage, options);
1180         }
1181
1182         if (add_default_attributes())
1183                 goto out;
1184
1185         if (target_pid != -1)
1186                 target_tid = target_pid;
1187
1188         evsel_list->threads = thread_map__new(target_pid, target_tid);
1189         if (evsel_list->threads == NULL) {
1190                 pr_err("Problems finding threads of monitor\n");
1191                 usage_with_options(stat_usage, options);
1192         }
1193
1194         if (system_wide)
1195                 evsel_list->cpus = cpu_map__new(cpu_list);
1196         else
1197                 evsel_list->cpus = cpu_map__dummy_new();
1198
1199         if (evsel_list->cpus == NULL) {
1200                 perror("failed to parse CPUs map");
1201                 usage_with_options(stat_usage, options);
1202                 return -1;
1203         }
1204
1205         list_for_each_entry(pos, &evsel_list->entries, node) {
1206                 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
1207                     perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
1208                     perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
1209                         goto out_free_fd;
1210         }
1211
1212         /*
1213          * We dont want to block the signals - that would cause
1214          * child tasks to inherit that and Ctrl-C would not work.
1215          * What we want is for Ctrl-C to work in the exec()-ed
1216          * task, but being ignored by perf stat itself:
1217          */
1218         atexit(sig_atexit);
1219         signal(SIGINT,  skip_signal);
1220         signal(SIGALRM, skip_signal);
1221         signal(SIGABRT, skip_signal);
1222
1223         status = 0;
1224         for (run_idx = 0; run_idx < run_count; run_idx++) {
1225                 if (run_count != 1 && verbose)
1226                         fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
1227
1228                 if (sync_run)
1229                         sync();
1230
1231                 status = run_perf_stat(argc, argv);
1232         }
1233
1234         if (status != -1)
1235                 print_stat(argc, argv);
1236 out_free_fd:
1237         list_for_each_entry(pos, &evsel_list->entries, node)
1238                 perf_evsel__free_stat_priv(pos);
1239         perf_evlist__delete_maps(evsel_list);
1240 out:
1241         perf_evlist__delete(evsel_list);
1242         return status;
1243 }