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Linux/tools/perf/builtin-stat.c

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  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/cgroup.h"
 47 #include "util/util.h"
 48 #include <subcmd/parse-options.h>
 49 #include "util/parse-events.h"
 50 #include "util/pmu.h"
 51 #include "util/event.h"
 52 #include "util/evlist.h"
 53 #include "util/evsel.h"
 54 #include "util/debug.h"
 55 #include "util/color.h"
 56 #include "util/stat.h"
 57 #include "util/header.h"
 58 #include "util/cpumap.h"
 59 #include "util/thread.h"
 60 #include "util/thread_map.h"
 61 #include "util/counts.h"
 62 #include "util/session.h"
 63 #include "util/tool.h"
 64 #include "asm/bug.h"
 65 
 66 #include <stdlib.h>
 67 #include <sys/prctl.h>
 68 #include <locale.h>
 69 
 70 #define DEFAULT_SEPARATOR       " "
 71 #define CNTR_NOT_SUPPORTED      "<not supported>"
 72 #define CNTR_NOT_COUNTED        "<not counted>"
 73 
 74 static void print_counters(struct timespec *ts, int argc, const char **argv);
 75 
 76 /* Default events used for perf stat -T */
 77 static const char *transaction_attrs = {
 78         "task-clock,"
 79         "{"
 80         "instructions,"
 81         "cycles,"
 82         "cpu/cycles-t/,"
 83         "cpu/tx-start/,"
 84         "cpu/el-start/,"
 85         "cpu/cycles-ct/"
 86         "}"
 87 };
 88 
 89 /* More limited version when the CPU does not have all events. */
 90 static const char * transaction_limited_attrs = {
 91         "task-clock,"
 92         "{"
 93         "instructions,"
 94         "cycles,"
 95         "cpu/cycles-t/,"
 96         "cpu/tx-start/"
 97         "}"
 98 };
 99 
100 static struct perf_evlist       *evsel_list;
101 
102 static struct target target = {
103         .uid    = UINT_MAX,
104 };
105 
106 typedef int (*aggr_get_id_t)(struct cpu_map *m, int cpu);
107 
108 static int                      run_count                       =  1;
109 static bool                     no_inherit                      = false;
110 static volatile pid_t           child_pid                       = -1;
111 static bool                     null_run                        =  false;
112 static int                      detailed_run                    =  0;
113 static bool                     transaction_run;
114 static bool                     big_num                         =  true;
115 static int                      big_num_opt                     =  -1;
116 static const char               *csv_sep                        = NULL;
117 static bool                     csv_output                      = false;
118 static bool                     group                           = false;
119 static const char               *pre_cmd                        = NULL;
120 static const char               *post_cmd                       = NULL;
121 static bool                     sync_run                        = false;
122 static unsigned int             initial_delay                   = 0;
123 static unsigned int             unit_width                      = 4; /* strlen("unit") */
124 static bool                     forever                         = false;
125 static bool                     metric_only                     = false;
126 static struct timespec          ref_time;
127 static struct cpu_map           *aggr_map;
128 static aggr_get_id_t            aggr_get_id;
129 static bool                     append_file;
130 static const char               *output_name;
131 static int                      output_fd;
132 
133 struct perf_stat {
134         bool                     record;
135         struct perf_data_file    file;
136         struct perf_session     *session;
137         u64                      bytes_written;
138         struct perf_tool         tool;
139         bool                     maps_allocated;
140         struct cpu_map          *cpus;
141         struct thread_map       *threads;
142         enum aggr_mode           aggr_mode;
143 };
144 
145 static struct perf_stat         perf_stat;
146 #define STAT_RECORD             perf_stat.record
147 
148 static volatile int done = 0;
149 
150 static struct perf_stat_config stat_config = {
151         .aggr_mode      = AGGR_GLOBAL,
152         .scale          = true,
153 };
154 
155 static inline void diff_timespec(struct timespec *r, struct timespec *a,
156                                  struct timespec *b)
157 {
158         r->tv_sec = a->tv_sec - b->tv_sec;
159         if (a->tv_nsec < b->tv_nsec) {
160                 r->tv_nsec = a->tv_nsec + 1000000000L - b->tv_nsec;
161                 r->tv_sec--;
162         } else {
163                 r->tv_nsec = a->tv_nsec - b->tv_nsec ;
164         }
165 }
166 
167 static void perf_stat__reset_stats(void)
168 {
169         perf_evlist__reset_stats(evsel_list);
170         perf_stat__reset_shadow_stats();
171 }
172 
173 static int create_perf_stat_counter(struct perf_evsel *evsel)
174 {
175         struct perf_event_attr *attr = &evsel->attr;
176 
177         if (stat_config.scale)
178                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
179                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
180 
181         attr->inherit = !no_inherit;
182 
183         /*
184          * Some events get initialized with sample_(period/type) set,
185          * like tracepoints. Clear it up for counting.
186          */
187         attr->sample_period = 0;
188 
189         /*
190          * But set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
191          * while avoiding that older tools show confusing messages.
192          *
193          * However for pipe sessions we need to keep it zero,
194          * because script's perf_evsel__check_attr is triggered
195          * by attr->sample_type != 0, and we can't run it on
196          * stat sessions.
197          */
198         if (!(STAT_RECORD && perf_stat.file.is_pipe))
199                 attr->sample_type = PERF_SAMPLE_IDENTIFIER;
200 
201         /*
202          * Disabling all counters initially, they will be enabled
203          * either manually by us or by kernel via enable_on_exec
204          * set later.
205          */
206         if (perf_evsel__is_group_leader(evsel)) {
207                 attr->disabled = 1;
208 
209                 /*
210                  * In case of initial_delay we enable tracee
211                  * events manually.
212                  */
213                 if (target__none(&target) && !initial_delay)
214                         attr->enable_on_exec = 1;
215         }
216 
217         if (target__has_cpu(&target))
218                 return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));
219 
220         return perf_evsel__open_per_thread(evsel, evsel_list->threads);
221 }
222 
223 /*
224  * Does the counter have nsecs as a unit?
225  */
226 static inline int nsec_counter(struct perf_evsel *evsel)
227 {
228         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
229             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
230                 return 1;
231 
232         return 0;
233 }
234 
235 static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
236                                      union perf_event *event,
237                                      struct perf_sample *sample __maybe_unused,
238                                      struct machine *machine __maybe_unused)
239 {
240         if (perf_data_file__write(&perf_stat.file, event, event->header.size) < 0) {
241                 pr_err("failed to write perf data, error: %m\n");
242                 return -1;
243         }
244 
245         perf_stat.bytes_written += event->header.size;
246         return 0;
247 }
248 
249 static int write_stat_round_event(u64 tm, u64 type)
250 {
251         return perf_event__synthesize_stat_round(NULL, tm, type,
252                                                  process_synthesized_event,
253                                                  NULL);
254 }
255 
256 #define WRITE_STAT_ROUND_EVENT(time, interval) \
257         write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)
258 
259 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
260 
261 static int
262 perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
263                              struct perf_counts_values *count)
264 {
265         struct perf_sample_id *sid = SID(counter, cpu, thread);
266 
267         return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
268                                            process_synthesized_event, NULL);
269 }
270 
271 /*
272  * Read out the results of a single counter:
273  * do not aggregate counts across CPUs in system-wide mode
274  */
275 static int read_counter(struct perf_evsel *counter)
276 {
277         int nthreads = thread_map__nr(evsel_list->threads);
278         int ncpus = perf_evsel__nr_cpus(counter);
279         int cpu, thread;
280 
281         if (!counter->supported)
282                 return -ENOENT;
283 
284         if (counter->system_wide)
285                 nthreads = 1;
286 
287         for (thread = 0; thread < nthreads; thread++) {
288                 for (cpu = 0; cpu < ncpus; cpu++) {
289                         struct perf_counts_values *count;
290 
291                         count = perf_counts(counter->counts, cpu, thread);
292                         if (perf_evsel__read(counter, cpu, thread, count))
293                                 return -1;
294 
295                         if (STAT_RECORD) {
296                                 if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
297                                         pr_err("failed to write stat event\n");
298                                         return -1;
299                                 }
300                         }
301                 }
302         }
303 
304         return 0;
305 }
306 
307 static void read_counters(bool close_counters)
308 {
309         struct perf_evsel *counter;
310 
311         evlist__for_each(evsel_list, counter) {
312                 if (read_counter(counter))
313                         pr_debug("failed to read counter %s\n", counter->name);
314 
315                 if (perf_stat_process_counter(&stat_config, counter))
316                         pr_warning("failed to process counter %s\n", counter->name);
317 
318                 if (close_counters) {
319                         perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
320                                              thread_map__nr(evsel_list->threads));
321                 }
322         }
323 }
324 
325 static void process_interval(void)
326 {
327         struct timespec ts, rs;
328 
329         read_counters(false);
330 
331         clock_gettime(CLOCK_MONOTONIC, &ts);
332         diff_timespec(&rs, &ts, &ref_time);
333 
334         if (STAT_RECORD) {
335                 if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSECS_PER_SEC + rs.tv_nsec, INTERVAL))
336                         pr_err("failed to write stat round event\n");
337         }
338 
339         print_counters(&rs, 0, NULL);
340 }
341 
342 static void enable_counters(void)
343 {
344         if (initial_delay)
345                 usleep(initial_delay * 1000);
346 
347         /*
348          * We need to enable counters only if:
349          * - we don't have tracee (attaching to task or cpu)
350          * - we have initial delay configured
351          */
352         if (!target__none(&target) || initial_delay)
353                 perf_evlist__enable(evsel_list);
354 }
355 
356 static volatile int workload_exec_errno;
357 
358 /*
359  * perf_evlist__prepare_workload will send a SIGUSR1
360  * if the fork fails, since we asked by setting its
361  * want_signal to true.
362  */
363 static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
364                                         void *ucontext __maybe_unused)
365 {
366         workload_exec_errno = info->si_value.sival_int;
367 }
368 
369 static bool has_unit(struct perf_evsel *counter)
370 {
371         return counter->unit && *counter->unit;
372 }
373 
374 static bool has_scale(struct perf_evsel *counter)
375 {
376         return counter->scale != 1;
377 }
378 
379 static int perf_stat_synthesize_config(bool is_pipe)
380 {
381         struct perf_evsel *counter;
382         int err;
383 
384         if (is_pipe) {
385                 err = perf_event__synthesize_attrs(NULL, perf_stat.session,
386                                                    process_synthesized_event);
387                 if (err < 0) {
388                         pr_err("Couldn't synthesize attrs.\n");
389                         return err;
390                 }
391         }
392 
393         /*
394          * Synthesize other events stuff not carried within
395          * attr event - unit, scale, name
396          */
397         evlist__for_each(evsel_list, counter) {
398                 if (!counter->supported)
399                         continue;
400 
401                 /*
402                  * Synthesize unit and scale only if it's defined.
403                  */
404                 if (has_unit(counter)) {
405                         err = perf_event__synthesize_event_update_unit(NULL, counter, process_synthesized_event);
406                         if (err < 0) {
407                                 pr_err("Couldn't synthesize evsel unit.\n");
408                                 return err;
409                         }
410                 }
411 
412                 if (has_scale(counter)) {
413                         err = perf_event__synthesize_event_update_scale(NULL, counter, process_synthesized_event);
414                         if (err < 0) {
415                                 pr_err("Couldn't synthesize evsel scale.\n");
416                                 return err;
417                         }
418                 }
419 
420                 if (counter->own_cpus) {
421                         err = perf_event__synthesize_event_update_cpus(NULL, counter, process_synthesized_event);
422                         if (err < 0) {
423                                 pr_err("Couldn't synthesize evsel scale.\n");
424                                 return err;
425                         }
426                 }
427 
428                 /*
429                  * Name is needed only for pipe output,
430                  * perf.data carries event names.
431                  */
432                 if (is_pipe) {
433                         err = perf_event__synthesize_event_update_name(NULL, counter, process_synthesized_event);
434                         if (err < 0) {
435                                 pr_err("Couldn't synthesize evsel name.\n");
436                                 return err;
437                         }
438                 }
439         }
440 
441         err = perf_event__synthesize_thread_map2(NULL, evsel_list->threads,
442                                                 process_synthesized_event,
443                                                 NULL);
444         if (err < 0) {
445                 pr_err("Couldn't synthesize thread map.\n");
446                 return err;
447         }
448 
449         err = perf_event__synthesize_cpu_map(NULL, evsel_list->cpus,
450                                              process_synthesized_event, NULL);
451         if (err < 0) {
452                 pr_err("Couldn't synthesize thread map.\n");
453                 return err;
454         }
455 
456         err = perf_event__synthesize_stat_config(NULL, &stat_config,
457                                                  process_synthesized_event, NULL);
458         if (err < 0) {
459                 pr_err("Couldn't synthesize config.\n");
460                 return err;
461         }
462 
463         return 0;
464 }
465 
466 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
467 
468 static int __store_counter_ids(struct perf_evsel *counter,
469                                struct cpu_map *cpus,
470                                struct thread_map *threads)
471 {
472         int cpu, thread;
473 
474         for (cpu = 0; cpu < cpus->nr; cpu++) {
475                 for (thread = 0; thread < threads->nr; thread++) {
476                         int fd = FD(counter, cpu, thread);
477 
478                         if (perf_evlist__id_add_fd(evsel_list, counter,
479                                                    cpu, thread, fd) < 0)
480                                 return -1;
481                 }
482         }
483 
484         return 0;
485 }
486 
487 static int store_counter_ids(struct perf_evsel *counter)
488 {
489         struct cpu_map *cpus = counter->cpus;
490         struct thread_map *threads = counter->threads;
491 
492         if (perf_evsel__alloc_id(counter, cpus->nr, threads->nr))
493                 return -ENOMEM;
494 
495         return __store_counter_ids(counter, cpus, threads);
496 }
497 
498 static int __run_perf_stat(int argc, const char **argv)
499 {
500         int interval = stat_config.interval;
501         char msg[512];
502         unsigned long long t0, t1;
503         struct perf_evsel *counter;
504         struct timespec ts;
505         size_t l;
506         int status = 0;
507         const bool forks = (argc > 0);
508         bool is_pipe = STAT_RECORD ? perf_stat.file.is_pipe : false;
509 
510         if (interval) {
511                 ts.tv_sec  = interval / 1000;
512                 ts.tv_nsec = (interval % 1000) * 1000000;
513         } else {
514                 ts.tv_sec  = 1;
515                 ts.tv_nsec = 0;
516         }
517 
518         if (forks) {
519                 if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
520                                                   workload_exec_failed_signal) < 0) {
521                         perror("failed to prepare workload");
522                         return -1;
523                 }
524                 child_pid = evsel_list->workload.pid;
525         }
526 
527         if (group)
528                 perf_evlist__set_leader(evsel_list);
529 
530         evlist__for_each(evsel_list, counter) {
531 try_again:
532                 if (create_perf_stat_counter(counter) < 0) {
533                         /*
534                          * PPC returns ENXIO for HW counters until 2.6.37
535                          * (behavior changed with commit b0a873e).
536                          */
537                         if (errno == EINVAL || errno == ENOSYS ||
538                             errno == ENOENT || errno == EOPNOTSUPP ||
539                             errno == ENXIO) {
540                                 if (verbose)
541                                         ui__warning("%s event is not supported by the kernel.\n",
542                                                     perf_evsel__name(counter));
543                                 counter->supported = false;
544 
545                                 if ((counter->leader != counter) ||
546                                     !(counter->leader->nr_members > 1))
547                                         continue;
548                         } else if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
549                                 if (verbose)
550                                         ui__warning("%s\n", msg);
551                                 goto try_again;
552                         }
553 
554                         perf_evsel__open_strerror(counter, &target,
555                                                   errno, msg, sizeof(msg));
556                         ui__error("%s\n", msg);
557 
558                         if (child_pid != -1)
559                                 kill(child_pid, SIGTERM);
560 
561                         return -1;
562                 }
563                 counter->supported = true;
564 
565                 l = strlen(counter->unit);
566                 if (l > unit_width)
567                         unit_width = l;
568 
569                 if (STAT_RECORD && store_counter_ids(counter))
570                         return -1;
571         }
572 
573         if (perf_evlist__apply_filters(evsel_list, &counter)) {
574                 error("failed to set filter \"%s\" on event %s with %d (%s)\n",
575                         counter->filter, perf_evsel__name(counter), errno,
576                         strerror_r(errno, msg, sizeof(msg)));
577                 return -1;
578         }
579 
580         if (STAT_RECORD) {
581                 int err, fd = perf_data_file__fd(&perf_stat.file);
582 
583                 if (is_pipe) {
584                         err = perf_header__write_pipe(perf_data_file__fd(&perf_stat.file));
585                 } else {
586                         err = perf_session__write_header(perf_stat.session, evsel_list,
587                                                          fd, false);
588                 }
589 
590                 if (err < 0)
591                         return err;
592 
593                 err = perf_stat_synthesize_config(is_pipe);
594                 if (err < 0)
595                         return err;
596         }
597 
598         /*
599          * Enable counters and exec the command:
600          */
601         t0 = rdclock();
602         clock_gettime(CLOCK_MONOTONIC, &ref_time);
603 
604         if (forks) {
605                 perf_evlist__start_workload(evsel_list);
606                 enable_counters();
607 
608                 if (interval) {
609                         while (!waitpid(child_pid, &status, WNOHANG)) {
610                                 nanosleep(&ts, NULL);
611                                 process_interval();
612                         }
613                 }
614                 wait(&status);
615 
616                 if (workload_exec_errno) {
617                         const char *emsg = strerror_r(workload_exec_errno, msg, sizeof(msg));
618                         pr_err("Workload failed: %s\n", emsg);
619                         return -1;
620                 }
621 
622                 if (WIFSIGNALED(status))
623                         psignal(WTERMSIG(status), argv[0]);
624         } else {
625                 enable_counters();
626                 while (!done) {
627                         nanosleep(&ts, NULL);
628                         if (interval)
629                                 process_interval();
630                 }
631         }
632 
633         t1 = rdclock();
634 
635         update_stats(&walltime_nsecs_stats, t1 - t0);
636 
637         read_counters(true);
638 
639         return WEXITSTATUS(status);
640 }
641 
642 static int run_perf_stat(int argc, const char **argv)
643 {
644         int ret;
645 
646         if (pre_cmd) {
647                 ret = system(pre_cmd);
648                 if (ret)
649                         return ret;
650         }
651 
652         if (sync_run)
653                 sync();
654 
655         ret = __run_perf_stat(argc, argv);
656         if (ret)
657                 return ret;
658 
659         if (post_cmd) {
660                 ret = system(post_cmd);
661                 if (ret)
662                         return ret;
663         }
664 
665         return ret;
666 }
667 
668 static void print_running(u64 run, u64 ena)
669 {
670         if (csv_output) {
671                 fprintf(stat_config.output, "%s%" PRIu64 "%s%.2f",
672                                         csv_sep,
673                                         run,
674                                         csv_sep,
675                                         ena ? 100.0 * run / ena : 100.0);
676         } else if (run != ena) {
677                 fprintf(stat_config.output, "  (%.2f%%)", 100.0 * run / ena);
678         }
679 }
680 
681 static void print_noise_pct(double total, double avg)
682 {
683         double pct = rel_stddev_stats(total, avg);
684 
685         if (csv_output)
686                 fprintf(stat_config.output, "%s%.2f%%", csv_sep, pct);
687         else if (pct)
688                 fprintf(stat_config.output, "  ( +-%6.2f%% )", pct);
689 }
690 
691 static void print_noise(struct perf_evsel *evsel, double avg)
692 {
693         struct perf_stat_evsel *ps;
694 
695         if (run_count == 1)
696                 return;
697 
698         ps = evsel->priv;
699         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
700 }
701 
702 static void aggr_printout(struct perf_evsel *evsel, int id, int nr)
703 {
704         switch (stat_config.aggr_mode) {
705         case AGGR_CORE:
706                 fprintf(stat_config.output, "S%d-C%*d%s%*d%s",
707                         cpu_map__id_to_socket(id),
708                         csv_output ? 0 : -8,
709                         cpu_map__id_to_cpu(id),
710                         csv_sep,
711                         csv_output ? 0 : 4,
712                         nr,
713                         csv_sep);
714                 break;
715         case AGGR_SOCKET:
716                 fprintf(stat_config.output, "S%*d%s%*d%s",
717                         csv_output ? 0 : -5,
718                         id,
719                         csv_sep,
720                         csv_output ? 0 : 4,
721                         nr,
722                         csv_sep);
723                         break;
724         case AGGR_NONE:
725                 fprintf(stat_config.output, "CPU%*d%s",
726                         csv_output ? 0 : -4,
727                         perf_evsel__cpus(evsel)->map[id], csv_sep);
728                 break;
729         case AGGR_THREAD:
730                 fprintf(stat_config.output, "%*s-%*d%s",
731                         csv_output ? 0 : 16,
732                         thread_map__comm(evsel->threads, id),
733                         csv_output ? 0 : -8,
734                         thread_map__pid(evsel->threads, id),
735                         csv_sep);
736                 break;
737         case AGGR_GLOBAL:
738         case AGGR_UNSET:
739         default:
740                 break;
741         }
742 }
743 
744 struct outstate {
745         FILE *fh;
746         bool newline;
747         const char *prefix;
748         int  nfields;
749         int  id, nr;
750         struct perf_evsel *evsel;
751 };
752 
753 #define METRIC_LEN  35
754 
755 static void new_line_std(void *ctx)
756 {
757         struct outstate *os = ctx;
758 
759         os->newline = true;
760 }
761 
762 static void do_new_line_std(struct outstate *os)
763 {
764         fputc('\n', os->fh);
765         fputs(os->prefix, os->fh);
766         aggr_printout(os->evsel, os->id, os->nr);
767         if (stat_config.aggr_mode == AGGR_NONE)
768                 fprintf(os->fh, "        ");
769         fprintf(os->fh, "                                                 ");
770 }
771 
772 static void print_metric_std(void *ctx, const char *color, const char *fmt,
773                              const char *unit, double val)
774 {
775         struct outstate *os = ctx;
776         FILE *out = os->fh;
777         int n;
778         bool newline = os->newline;
779 
780         os->newline = false;
781 
782         if (unit == NULL || fmt == NULL) {
783                 fprintf(out, "%-*s", METRIC_LEN, "");
784                 return;
785         }
786 
787         if (newline)
788                 do_new_line_std(os);
789 
790         n = fprintf(out, " # ");
791         if (color)
792                 n += color_fprintf(out, color, fmt, val);
793         else
794                 n += fprintf(out, fmt, val);
795         fprintf(out, " %-*s", METRIC_LEN - n - 1, unit);
796 }
797 
798 static void new_line_csv(void *ctx)
799 {
800         struct outstate *os = ctx;
801         int i;
802 
803         fputc('\n', os->fh);
804         if (os->prefix)
805                 fprintf(os->fh, "%s%s", os->prefix, csv_sep);
806         aggr_printout(os->evsel, os->id, os->nr);
807         for (i = 0; i < os->nfields; i++)
808                 fputs(csv_sep, os->fh);
809 }
810 
811 static void print_metric_csv(void *ctx,
812                              const char *color __maybe_unused,
813                              const char *fmt, const char *unit, double val)
814 {
815         struct outstate *os = ctx;
816         FILE *out = os->fh;
817         char buf[64], *vals, *ends;
818 
819         if (unit == NULL || fmt == NULL) {
820                 fprintf(out, "%s%s%s%s", csv_sep, csv_sep, csv_sep, csv_sep);
821                 return;
822         }
823         snprintf(buf, sizeof(buf), fmt, val);
824         vals = buf;
825         while (isspace(*vals))
826                 vals++;
827         ends = vals;
828         while (isdigit(*ends) || *ends == '.')
829                 ends++;
830         *ends = 0;
831         while (isspace(*unit))
832                 unit++;
833         fprintf(out, "%s%s%s%s", csv_sep, vals, csv_sep, unit);
834 }
835 
836 #define METRIC_ONLY_LEN 20
837 
838 /* Filter out some columns that don't work well in metrics only mode */
839 
840 static bool valid_only_metric(const char *unit)
841 {
842         if (!unit)
843                 return false;
844         if (strstr(unit, "/sec") ||
845             strstr(unit, "hz") ||
846             strstr(unit, "Hz") ||
847             strstr(unit, "CPUs utilized"))
848                 return false;
849         return true;
850 }
851 
852 static const char *fixunit(char *buf, struct perf_evsel *evsel,
853                            const char *unit)
854 {
855         if (!strncmp(unit, "of all", 6)) {
856                 snprintf(buf, 1024, "%s %s", perf_evsel__name(evsel),
857                          unit);
858                 return buf;
859         }
860         return unit;
861 }
862 
863 static void print_metric_only(void *ctx, const char *color, const char *fmt,
864                               const char *unit, double val)
865 {
866         struct outstate *os = ctx;
867         FILE *out = os->fh;
868         int n;
869         char buf[1024];
870         unsigned mlen = METRIC_ONLY_LEN;
871 
872         if (!valid_only_metric(unit))
873                 return;
874         unit = fixunit(buf, os->evsel, unit);
875         if (color)
876                 n = color_fprintf(out, color, fmt, val);
877         else
878                 n = fprintf(out, fmt, val);
879         if (n > METRIC_ONLY_LEN)
880                 n = METRIC_ONLY_LEN;
881         if (mlen < strlen(unit))
882                 mlen = strlen(unit) + 1;
883         fprintf(out, "%*s", mlen - n, "");
884 }
885 
886 static void print_metric_only_csv(void *ctx, const char *color __maybe_unused,
887                                   const char *fmt,
888                                   const char *unit, double val)
889 {
890         struct outstate *os = ctx;
891         FILE *out = os->fh;
892         char buf[64], *vals, *ends;
893         char tbuf[1024];
894 
895         if (!valid_only_metric(unit))
896                 return;
897         unit = fixunit(tbuf, os->evsel, unit);
898         snprintf(buf, sizeof buf, fmt, val);
899         vals = buf;
900         while (isspace(*vals))
901                 vals++;
902         ends = vals;
903         while (isdigit(*ends) || *ends == '.')
904                 ends++;
905         *ends = 0;
906         fprintf(out, "%s%s", vals, csv_sep);
907 }
908 
909 static void new_line_metric(void *ctx __maybe_unused)
910 {
911 }
912 
913 static void print_metric_header(void *ctx, const char *color __maybe_unused,
914                                 const char *fmt __maybe_unused,
915                                 const char *unit, double val __maybe_unused)
916 {
917         struct outstate *os = ctx;
918         char tbuf[1024];
919 
920         if (!valid_only_metric(unit))
921                 return;
922         unit = fixunit(tbuf, os->evsel, unit);
923         if (csv_output)
924                 fprintf(os->fh, "%s%s", unit, csv_sep);
925         else
926                 fprintf(os->fh, "%-*s ", METRIC_ONLY_LEN, unit);
927 }
928 
929 static void nsec_printout(int id, int nr, struct perf_evsel *evsel, double avg)
930 {
931         FILE *output = stat_config.output;
932         double msecs = avg / 1e6;
933         const char *fmt_v, *fmt_n;
934         char name[25];
935 
936         fmt_v = csv_output ? "%.6f%s" : "%18.6f%s";
937         fmt_n = csv_output ? "%s" : "%-25s";
938 
939         aggr_printout(evsel, id, nr);
940 
941         scnprintf(name, sizeof(name), "%s%s",
942                   perf_evsel__name(evsel), csv_output ? "" : " (msec)");
943 
944         fprintf(output, fmt_v, msecs, csv_sep);
945 
946         if (csv_output)
947                 fprintf(output, "%s%s", evsel->unit, csv_sep);
948         else
949                 fprintf(output, "%-*s%s", unit_width, evsel->unit, csv_sep);
950 
951         fprintf(output, fmt_n, name);
952 
953         if (evsel->cgrp)
954                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
955 }
956 
957 static int first_shadow_cpu(struct perf_evsel *evsel, int id)
958 {
959         int i;
960 
961         if (!aggr_get_id)
962                 return 0;
963 
964         if (stat_config.aggr_mode == AGGR_NONE)
965                 return id;
966 
967         if (stat_config.aggr_mode == AGGR_GLOBAL)
968                 return 0;
969 
970         for (i = 0; i < perf_evsel__nr_cpus(evsel); i++) {
971                 int cpu2 = perf_evsel__cpus(evsel)->map[i];
972 
973                 if (aggr_get_id(evsel_list->cpus, cpu2) == id)
974                         return cpu2;
975         }
976         return 0;
977 }
978 
979 static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
980 {
981         FILE *output = stat_config.output;
982         double sc =  evsel->scale;
983         const char *fmt;
984 
985         if (csv_output) {
986                 fmt = sc != 1.0 ?  "%.2f%s" : "%.0f%s";
987         } else {
988                 if (big_num)
989                         fmt = sc != 1.0 ? "%'18.2f%s" : "%'18.0f%s";
990                 else
991                         fmt = sc != 1.0 ? "%18.2f%s" : "%18.0f%s";
992         }
993 
994         aggr_printout(evsel, id, nr);
995 
996         fprintf(output, fmt, avg, csv_sep);
997 
998         if (evsel->unit)
999                 fprintf(output, "%-*s%s",
1000                         csv_output ? 0 : unit_width,
1001                         evsel->unit, csv_sep);
1002 
1003         fprintf(output, "%-*s", csv_output ? 0 : 25, perf_evsel__name(evsel));
1004 
1005         if (evsel->cgrp)
1006                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
1007 }
1008 
1009 static void printout(int id, int nr, struct perf_evsel *counter, double uval,
1010                      char *prefix, u64 run, u64 ena, double noise)
1011 {
1012         struct perf_stat_output_ctx out;
1013         struct outstate os = {
1014                 .fh = stat_config.output,
1015                 .prefix = prefix ? prefix : "",
1016                 .id = id,
1017                 .nr = nr,
1018                 .evsel = counter,
1019         };
1020         print_metric_t pm = print_metric_std;
1021         void (*nl)(void *);
1022 
1023         if (metric_only) {
1024                 nl = new_line_metric;
1025                 if (csv_output)
1026                         pm = print_metric_only_csv;
1027                 else
1028                         pm = print_metric_only;
1029         } else
1030                 nl = new_line_std;
1031 
1032         if (csv_output && !metric_only) {
1033                 static int aggr_fields[] = {
1034                         [AGGR_GLOBAL] = 0,
1035                         [AGGR_THREAD] = 1,
1036                         [AGGR_NONE] = 1,
1037                         [AGGR_SOCKET] = 2,
1038                         [AGGR_CORE] = 2,
1039                 };
1040 
1041                 pm = print_metric_csv;
1042                 nl = new_line_csv;
1043                 os.nfields = 3;
1044                 os.nfields += aggr_fields[stat_config.aggr_mode];
1045                 if (counter->cgrp)
1046                         os.nfields++;
1047         }
1048         if (run == 0 || ena == 0 || counter->counts->scaled == -1) {
1049                 if (metric_only) {
1050                         pm(&os, NULL, "", "", 0);
1051                         return;
1052                 }
1053                 aggr_printout(counter, id, nr);
1054 
1055                 fprintf(stat_config.output, "%*s%s",
1056                         csv_output ? 0 : 18,
1057                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
1058                         csv_sep);
1059 
1060                 fprintf(stat_config.output, "%-*s%s",
1061                         csv_output ? 0 : unit_width,
1062                         counter->unit, csv_sep);
1063 
1064                 fprintf(stat_config.output, "%*s",
1065                         csv_output ? 0 : -25,
1066                         perf_evsel__name(counter));
1067 
1068                 if (counter->cgrp)
1069                         fprintf(stat_config.output, "%s%s",
1070                                 csv_sep, counter->cgrp->name);
1071 
1072                 if (!csv_output)
1073                         pm(&os, NULL, NULL, "", 0);
1074                 print_noise(counter, noise);
1075                 print_running(run, ena);
1076                 if (csv_output)
1077                         pm(&os, NULL, NULL, "", 0);
1078                 return;
1079         }
1080 
1081         if (metric_only)
1082                 /* nothing */;
1083         else if (nsec_counter(counter))
1084                 nsec_printout(id, nr, counter, uval);
1085         else
1086                 abs_printout(id, nr, counter, uval);
1087 
1088         out.print_metric = pm;
1089         out.new_line = nl;
1090         out.ctx = &os;
1091 
1092         if (csv_output && !metric_only) {
1093                 print_noise(counter, noise);
1094                 print_running(run, ena);
1095         }
1096 
1097         perf_stat__print_shadow_stats(counter, uval,
1098                                 first_shadow_cpu(counter, id),
1099                                 &out);
1100         if (!csv_output && !metric_only) {
1101                 print_noise(counter, noise);
1102                 print_running(run, ena);
1103         }
1104 }
1105 
1106 static void aggr_update_shadow(void)
1107 {
1108         int cpu, s2, id, s;
1109         u64 val;
1110         struct perf_evsel *counter;
1111 
1112         for (s = 0; s < aggr_map->nr; s++) {
1113                 id = aggr_map->map[s];
1114                 evlist__for_each(evsel_list, counter) {
1115                         val = 0;
1116                         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
1117                                 s2 = aggr_get_id(evsel_list->cpus, cpu);
1118                                 if (s2 != id)
1119                                         continue;
1120                                 val += perf_counts(counter->counts, cpu, 0)->val;
1121                         }
1122                         val = val * counter->scale;
1123                         perf_stat__update_shadow_stats(counter, &val,
1124                                                        first_shadow_cpu(counter, id));
1125                 }
1126         }
1127 }
1128 
1129 static void print_aggr(char *prefix)
1130 {
1131         FILE *output = stat_config.output;
1132         struct perf_evsel *counter;
1133         int cpu, s, s2, id, nr;
1134         double uval;
1135         u64 ena, run, val;
1136         bool first;
1137 
1138         if (!(aggr_map || aggr_get_id))
1139                 return;
1140 
1141         aggr_update_shadow();
1142 
1143         /*
1144          * With metric_only everything is on a single line.
1145          * Without each counter has its own line.
1146          */
1147         for (s = 0; s < aggr_map->nr; s++) {
1148                 if (prefix && metric_only)
1149                         fprintf(output, "%s", prefix);
1150 
1151                 id = aggr_map->map[s];
1152                 first = true;
1153                 evlist__for_each(evsel_list, counter) {
1154                         val = ena = run = 0;
1155                         nr = 0;
1156                         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
1157                                 s2 = aggr_get_id(perf_evsel__cpus(counter), cpu);
1158                                 if (s2 != id)
1159                                         continue;
1160                                 val += perf_counts(counter->counts, cpu, 0)->val;
1161                                 ena += perf_counts(counter->counts, cpu, 0)->ena;
1162                                 run += perf_counts(counter->counts, cpu, 0)->run;
1163                                 nr++;
1164                         }
1165                         if (first && metric_only) {
1166                                 first = false;
1167                                 aggr_printout(counter, id, nr);
1168                         }
1169                         if (prefix && !metric_only)
1170                                 fprintf(output, "%s", prefix);
1171 
1172                         uval = val * counter->scale;
1173                         printout(id, nr, counter, uval, prefix, run, ena, 1.0);
1174                         if (!metric_only)
1175                                 fputc('\n', output);
1176                 }
1177                 if (metric_only)
1178                         fputc('\n', output);
1179         }
1180 }
1181 
1182 static void print_aggr_thread(struct perf_evsel *counter, char *prefix)
1183 {
1184         FILE *output = stat_config.output;
1185         int nthreads = thread_map__nr(counter->threads);
1186         int ncpus = cpu_map__nr(counter->cpus);
1187         int cpu, thread;
1188         double uval;
1189 
1190         for (thread = 0; thread < nthreads; thread++) {
1191                 u64 ena = 0, run = 0, val = 0;
1192 
1193                 for (cpu = 0; cpu < ncpus; cpu++) {
1194                         val += perf_counts(counter->counts, cpu, thread)->val;
1195                         ena += perf_counts(counter->counts, cpu, thread)->ena;
1196                         run += perf_counts(counter->counts, cpu, thread)->run;
1197                 }
1198 
1199                 if (prefix)
1200                         fprintf(output, "%s", prefix);
1201 
1202                 uval = val * counter->scale;
1203                 printout(thread, 0, counter, uval, prefix, run, ena, 1.0);
1204                 fputc('\n', output);
1205         }
1206 }
1207 
1208 /*
1209  * Print out the results of a single counter:
1210  * aggregated counts in system-wide mode
1211  */
1212 static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
1213 {
1214         FILE *output = stat_config.output;
1215         struct perf_stat_evsel *ps = counter->priv;
1216         double avg = avg_stats(&ps->res_stats[0]);
1217         double uval;
1218         double avg_enabled, avg_running;
1219 
1220         avg_enabled = avg_stats(&ps->res_stats[1]);
1221         avg_running = avg_stats(&ps->res_stats[2]);
1222 
1223         if (prefix && !metric_only)
1224                 fprintf(output, "%s", prefix);
1225 
1226         uval = avg * counter->scale;
1227         printout(-1, 0, counter, uval, prefix, avg_running, avg_enabled, avg);
1228         if (!metric_only)
1229                 fprintf(output, "\n");
1230 }
1231 
1232 /*
1233  * Print out the results of a single counter:
1234  * does not use aggregated count in system-wide
1235  */
1236 static void print_counter(struct perf_evsel *counter, char *prefix)
1237 {
1238         FILE *output = stat_config.output;
1239         u64 ena, run, val;
1240         double uval;
1241         int cpu;
1242 
1243         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
1244                 val = perf_counts(counter->counts, cpu, 0)->val;
1245                 ena = perf_counts(counter->counts, cpu, 0)->ena;
1246                 run = perf_counts(counter->counts, cpu, 0)->run;
1247 
1248                 if (prefix)
1249                         fprintf(output, "%s", prefix);
1250 
1251                 uval = val * counter->scale;
1252                 printout(cpu, 0, counter, uval, prefix, run, ena, 1.0);
1253 
1254                 fputc('\n', output);
1255         }
1256 }
1257 
1258 static void print_no_aggr_metric(char *prefix)
1259 {
1260         int cpu;
1261         int nrcpus = 0;
1262         struct perf_evsel *counter;
1263         u64 ena, run, val;
1264         double uval;
1265 
1266         nrcpus = evsel_list->cpus->nr;
1267         for (cpu = 0; cpu < nrcpus; cpu++) {
1268                 bool first = true;
1269 
1270                 if (prefix)
1271                         fputs(prefix, stat_config.output);
1272                 evlist__for_each(evsel_list, counter) {
1273                         if (first) {
1274                                 aggr_printout(counter, cpu, 0);
1275                                 first = false;
1276                         }
1277                         val = perf_counts(counter->counts, cpu, 0)->val;
1278                         ena = perf_counts(counter->counts, cpu, 0)->ena;
1279                         run = perf_counts(counter->counts, cpu, 0)->run;
1280 
1281                         uval = val * counter->scale;
1282                         printout(cpu, 0, counter, uval, prefix, run, ena, 1.0);
1283                 }
1284                 fputc('\n', stat_config.output);
1285         }
1286 }
1287 
1288 static int aggr_header_lens[] = {
1289         [AGGR_CORE] = 18,
1290         [AGGR_SOCKET] = 12,
1291         [AGGR_NONE] = 6,
1292         [AGGR_THREAD] = 24,
1293         [AGGR_GLOBAL] = 0,
1294 };
1295 
1296 static void print_metric_headers(char *prefix)
1297 {
1298         struct perf_stat_output_ctx out;
1299         struct perf_evsel *counter;
1300         struct outstate os = {
1301                 .fh = stat_config.output
1302         };
1303 
1304         if (prefix)
1305                 fprintf(stat_config.output, "%s", prefix);
1306 
1307         if (!csv_output)
1308                 fprintf(stat_config.output, "%*s",
1309                         aggr_header_lens[stat_config.aggr_mode], "");
1310 
1311         /* Print metrics headers only */
1312         evlist__for_each(evsel_list, counter) {
1313                 os.evsel = counter;
1314                 out.ctx = &os;
1315                 out.print_metric = print_metric_header;
1316                 out.new_line = new_line_metric;
1317                 os.evsel = counter;
1318                 perf_stat__print_shadow_stats(counter, 0,
1319                                               0,
1320                                               &out);
1321         }
1322         fputc('\n', stat_config.output);
1323 }
1324 
1325 static void print_interval(char *prefix, struct timespec *ts)
1326 {
1327         FILE *output = stat_config.output;
1328         static int num_print_interval;
1329 
1330         sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
1331 
1332         if (num_print_interval == 0 && !csv_output && !metric_only) {
1333                 switch (stat_config.aggr_mode) {
1334                 case AGGR_SOCKET:
1335                         fprintf(output, "#           time socket cpus             counts %*s events\n", unit_width, "unit");
1336                         break;
1337                 case AGGR_CORE:
1338                         fprintf(output, "#           time core         cpus             counts %*s events\n", unit_width, "unit");
1339                         break;
1340                 case AGGR_NONE:
1341                         fprintf(output, "#           time CPU                counts %*s events\n", unit_width, "unit");
1342                         break;
1343                 case AGGR_THREAD:
1344                         fprintf(output, "#           time             comm-pid                  counts %*s events\n", unit_width, "unit");
1345                         break;
1346                 case AGGR_GLOBAL:
1347                 default:
1348                         fprintf(output, "#           time             counts %*s events\n", unit_width, "unit");
1349                 case AGGR_UNSET:
1350                         break;
1351                 }
1352         }
1353 
1354         if (++num_print_interval == 25)
1355                 num_print_interval = 0;
1356 }
1357 
1358 static void print_header(int argc, const char **argv)
1359 {
1360         FILE *output = stat_config.output;
1361         int i;
1362 
1363         fflush(stdout);
1364 
1365         if (!csv_output) {
1366                 fprintf(output, "\n");
1367                 fprintf(output, " Performance counter stats for ");
1368                 if (target.system_wide)
1369                         fprintf(output, "\'system wide");
1370                 else if (target.cpu_list)
1371                         fprintf(output, "\'CPU(s) %s", target.cpu_list);
1372                 else if (!target__has_task(&target)) {
1373                         fprintf(output, "\'%s", argv ? argv[0] : "pipe");
1374                         for (i = 1; argv && (i < argc); i++)
1375                                 fprintf(output, " %s", argv[i]);
1376                 } else if (target.pid)
1377                         fprintf(output, "process id \'%s", target.pid);
1378                 else
1379                         fprintf(output, "thread id \'%s", target.tid);
1380 
1381                 fprintf(output, "\'");
1382                 if (run_count > 1)
1383                         fprintf(output, " (%d runs)", run_count);
1384                 fprintf(output, ":\n\n");
1385         }
1386 }
1387 
1388 static void print_footer(void)
1389 {
1390         FILE *output = stat_config.output;
1391 
1392         if (!null_run)
1393                 fprintf(output, "\n");
1394         fprintf(output, " %17.9f seconds time elapsed",
1395                         avg_stats(&walltime_nsecs_stats)/1e9);
1396         if (run_count > 1) {
1397                 fprintf(output, "                                        ");
1398                 print_noise_pct(stddev_stats(&walltime_nsecs_stats),
1399                                 avg_stats(&walltime_nsecs_stats));
1400         }
1401         fprintf(output, "\n\n");
1402 }
1403 
1404 static void print_counters(struct timespec *ts, int argc, const char **argv)
1405 {
1406         int interval = stat_config.interval;
1407         struct perf_evsel *counter;
1408         char buf[64], *prefix = NULL;
1409 
1410         /* Do not print anything if we record to the pipe. */
1411         if (STAT_RECORD && perf_stat.file.is_pipe)
1412                 return;
1413 
1414         if (interval)
1415                 print_interval(prefix = buf, ts);
1416         else
1417                 print_header(argc, argv);
1418 
1419         if (metric_only) {
1420                 static int num_print_iv;
1421 
1422                 if (num_print_iv == 0)
1423                         print_metric_headers(prefix);
1424                 if (num_print_iv++ == 25)
1425                         num_print_iv = 0;
1426                 if (stat_config.aggr_mode == AGGR_GLOBAL && prefix)
1427                         fprintf(stat_config.output, "%s", prefix);
1428         }
1429 
1430         switch (stat_config.aggr_mode) {
1431         case AGGR_CORE:
1432         case AGGR_SOCKET:
1433                 print_aggr(prefix);
1434                 break;
1435         case AGGR_THREAD:
1436                 evlist__for_each(evsel_list, counter)
1437                         print_aggr_thread(counter, prefix);
1438                 break;
1439         case AGGR_GLOBAL:
1440                 evlist__for_each(evsel_list, counter)
1441                         print_counter_aggr(counter, prefix);
1442                 if (metric_only)
1443                         fputc('\n', stat_config.output);
1444                 break;
1445         case AGGR_NONE:
1446                 if (metric_only)
1447                         print_no_aggr_metric(prefix);
1448                 else {
1449                         evlist__for_each(evsel_list, counter)
1450                                 print_counter(counter, prefix);
1451                 }
1452                 break;
1453         case AGGR_UNSET:
1454         default:
1455                 break;
1456         }
1457 
1458         if (!interval && !csv_output)
1459                 print_footer();
1460 
1461         fflush(stat_config.output);
1462 }
1463 
1464 static volatile int signr = -1;
1465 
1466 static void skip_signal(int signo)
1467 {
1468         if ((child_pid == -1) || stat_config.interval)
1469                 done = 1;
1470 
1471         signr = signo;
1472         /*
1473          * render child_pid harmless
1474          * won't send SIGTERM to a random
1475          * process in case of race condition
1476          * and fast PID recycling
1477          */
1478         child_pid = -1;
1479 }
1480 
1481 static void sig_atexit(void)
1482 {
1483         sigset_t set, oset;
1484 
1485         /*
1486          * avoid race condition with SIGCHLD handler
1487          * in skip_signal() which is modifying child_pid
1488          * goal is to avoid send SIGTERM to a random
1489          * process
1490          */
1491         sigemptyset(&set);
1492         sigaddset(&set, SIGCHLD);
1493         sigprocmask(SIG_BLOCK, &set, &oset);
1494 
1495         if (child_pid != -1)
1496                 kill(child_pid, SIGTERM);
1497 
1498         sigprocmask(SIG_SETMASK, &oset, NULL);
1499 
1500         if (signr == -1)
1501                 return;
1502 
1503         signal(signr, SIG_DFL);
1504         kill(getpid(), signr);
1505 }
1506 
1507 static int stat__set_big_num(const struct option *opt __maybe_unused,
1508                              const char *s __maybe_unused, int unset)
1509 {
1510         big_num_opt = unset ? 0 : 1;
1511         return 0;
1512 }
1513 
1514 static const struct option stat_options[] = {
1515         OPT_BOOLEAN('T', "transaction", &transaction_run,
1516                     "hardware transaction statistics"),
1517         OPT_CALLBACK('e', "event", &evsel_list, "event",
1518                      "event selector. use 'perf list' to list available events",
1519                      parse_events_option),
1520         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1521                      "event filter", parse_filter),
1522         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1523                     "child tasks do not inherit counters"),
1524         OPT_STRING('p', "pid", &target.pid, "pid",
1525                    "stat events on existing process id"),
1526         OPT_STRING('t', "tid", &target.tid, "tid",
1527                    "stat events on existing thread id"),
1528         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
1529                     "system-wide collection from all CPUs"),
1530         OPT_BOOLEAN('g', "group", &group,
1531                     "put the counters into a counter group"),
1532         OPT_BOOLEAN('c', "scale", &stat_config.scale, "scale/normalize counters"),
1533         OPT_INCR('v', "verbose", &verbose,
1534                     "be more verbose (show counter open errors, etc)"),
1535         OPT_INTEGER('r', "repeat", &run_count,
1536                     "repeat command and print average + stddev (max: 100, forever: 0)"),
1537         OPT_BOOLEAN('n', "null", &null_run,
1538                     "null run - dont start any counters"),
1539         OPT_INCR('d', "detailed", &detailed_run,
1540                     "detailed run - start a lot of events"),
1541         OPT_BOOLEAN('S', "sync", &sync_run,
1542                     "call sync() before starting a run"),
1543         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
1544                            "print large numbers with thousands\' separators",
1545                            stat__set_big_num),
1546         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
1547                     "list of cpus to monitor in system-wide"),
1548         OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
1549                     "disable CPU count aggregation", AGGR_NONE),
1550         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1551                    "print counts with custom separator"),
1552         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1553                      "monitor event in cgroup name only", parse_cgroups),
1554         OPT_STRING('o', "output", &output_name, "file", "output file name"),
1555         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
1556         OPT_INTEGER(0, "log-fd", &output_fd,
1557                     "log output to fd, instead of stderr"),
1558         OPT_STRING(0, "pre", &pre_cmd, "command",
1559                         "command to run prior to the measured command"),
1560         OPT_STRING(0, "post", &post_cmd, "command",
1561                         "command to run after to the measured command"),
1562         OPT_UINTEGER('I', "interval-print", &stat_config.interval,
1563                     "print counts at regular interval in ms (>= 10)"),
1564         OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
1565                      "aggregate counts per processor socket", AGGR_SOCKET),
1566         OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
1567                      "aggregate counts per physical processor core", AGGR_CORE),
1568         OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
1569                      "aggregate counts per thread", AGGR_THREAD),
1570         OPT_UINTEGER('D', "delay", &initial_delay,
1571                      "ms to wait before starting measurement after program start"),
1572         OPT_BOOLEAN(0, "metric-only", &metric_only,
1573                         "Only print computed metrics. No raw values"),
1574         OPT_END()
1575 };
1576 
1577 static int perf_stat__get_socket(struct cpu_map *map, int cpu)
1578 {
1579         return cpu_map__get_socket(map, cpu, NULL);
1580 }
1581 
1582 static int perf_stat__get_core(struct cpu_map *map, int cpu)
1583 {
1584         return cpu_map__get_core(map, cpu, NULL);
1585 }
1586 
1587 static int cpu_map__get_max(struct cpu_map *map)
1588 {
1589         int i, max = -1;
1590 
1591         for (i = 0; i < map->nr; i++) {
1592                 if (map->map[i] > max)
1593                         max = map->map[i];
1594         }
1595 
1596         return max;
1597 }
1598 
1599 static struct cpu_map *cpus_aggr_map;
1600 
1601 static int perf_stat__get_aggr(aggr_get_id_t get_id, struct cpu_map *map, int idx)
1602 {
1603         int cpu;
1604 
1605         if (idx >= map->nr)
1606                 return -1;
1607 
1608         cpu = map->map[idx];
1609 
1610         if (cpus_aggr_map->map[cpu] == -1)
1611                 cpus_aggr_map->map[cpu] = get_id(map, idx);
1612 
1613         return cpus_aggr_map->map[cpu];
1614 }
1615 
1616 static int perf_stat__get_socket_cached(struct cpu_map *map, int idx)
1617 {
1618         return perf_stat__get_aggr(perf_stat__get_socket, map, idx);
1619 }
1620 
1621 static int perf_stat__get_core_cached(struct cpu_map *map, int idx)
1622 {
1623         return perf_stat__get_aggr(perf_stat__get_core, map, idx);
1624 }
1625 
1626 static int perf_stat_init_aggr_mode(void)
1627 {
1628         int nr;
1629 
1630         switch (stat_config.aggr_mode) {
1631         case AGGR_SOCKET:
1632                 if (cpu_map__build_socket_map(evsel_list->cpus, &aggr_map)) {
1633                         perror("cannot build socket map");
1634                         return -1;
1635                 }
1636                 aggr_get_id = perf_stat__get_socket_cached;
1637                 break;
1638         case AGGR_CORE:
1639                 if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) {
1640                         perror("cannot build core map");
1641                         return -1;
1642                 }
1643                 aggr_get_id = perf_stat__get_core_cached;
1644                 break;
1645         case AGGR_NONE:
1646         case AGGR_GLOBAL:
1647         case AGGR_THREAD:
1648         case AGGR_UNSET:
1649         default:
1650                 break;
1651         }
1652 
1653         /*
1654          * The evsel_list->cpus is the base we operate on,
1655          * taking the highest cpu number to be the size of
1656          * the aggregation translate cpumap.
1657          */
1658         nr = cpu_map__get_max(evsel_list->cpus);
1659         cpus_aggr_map = cpu_map__empty_new(nr + 1);
1660         return cpus_aggr_map ? 0 : -ENOMEM;
1661 }
1662 
1663 static void perf_stat__exit_aggr_mode(void)
1664 {
1665         cpu_map__put(aggr_map);
1666         cpu_map__put(cpus_aggr_map);
1667         aggr_map = NULL;
1668         cpus_aggr_map = NULL;
1669 }
1670 
1671 static inline int perf_env__get_cpu(struct perf_env *env, struct cpu_map *map, int idx)
1672 {
1673         int cpu;
1674 
1675         if (idx > map->nr)
1676                 return -1;
1677 
1678         cpu = map->map[idx];
1679 
1680         if (cpu >= env->nr_cpus_online)
1681                 return -1;
1682 
1683         return cpu;
1684 }
1685 
1686 static int perf_env__get_socket(struct cpu_map *map, int idx, void *data)
1687 {
1688         struct perf_env *env = data;
1689         int cpu = perf_env__get_cpu(env, map, idx);
1690 
1691         return cpu == -1 ? -1 : env->cpu[cpu].socket_id;
1692 }
1693 
1694 static int perf_env__get_core(struct cpu_map *map, int idx, void *data)
1695 {
1696         struct perf_env *env = data;
1697         int core = -1, cpu = perf_env__get_cpu(env, map, idx);
1698 
1699         if (cpu != -1) {
1700                 int socket_id = env->cpu[cpu].socket_id;
1701 
1702                 /*
1703                  * Encode socket in upper 16 bits
1704                  * core_id is relative to socket, and
1705                  * we need a global id. So we combine
1706                  * socket + core id.
1707                  */
1708                 core = (socket_id << 16) | (env->cpu[cpu].core_id & 0xffff);
1709         }
1710 
1711         return core;
1712 }
1713 
1714 static int perf_env__build_socket_map(struct perf_env *env, struct cpu_map *cpus,
1715                                       struct cpu_map **sockp)
1716 {
1717         return cpu_map__build_map(cpus, sockp, perf_env__get_socket, env);
1718 }
1719 
1720 static int perf_env__build_core_map(struct perf_env *env, struct cpu_map *cpus,
1721                                     struct cpu_map **corep)
1722 {
1723         return cpu_map__build_map(cpus, corep, perf_env__get_core, env);
1724 }
1725 
1726 static int perf_stat__get_socket_file(struct cpu_map *map, int idx)
1727 {
1728         return perf_env__get_socket(map, idx, &perf_stat.session->header.env);
1729 }
1730 
1731 static int perf_stat__get_core_file(struct cpu_map *map, int idx)
1732 {
1733         return perf_env__get_core(map, idx, &perf_stat.session->header.env);
1734 }
1735 
1736 static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
1737 {
1738         struct perf_env *env = &st->session->header.env;
1739 
1740         switch (stat_config.aggr_mode) {
1741         case AGGR_SOCKET:
1742                 if (perf_env__build_socket_map(env, evsel_list->cpus, &aggr_map)) {
1743                         perror("cannot build socket map");
1744                         return -1;
1745                 }
1746                 aggr_get_id = perf_stat__get_socket_file;
1747                 break;
1748         case AGGR_CORE:
1749                 if (perf_env__build_core_map(env, evsel_list->cpus, &aggr_map)) {
1750                         perror("cannot build core map");
1751                         return -1;
1752                 }
1753                 aggr_get_id = perf_stat__get_core_file;
1754                 break;
1755         case AGGR_NONE:
1756         case AGGR_GLOBAL:
1757         case AGGR_THREAD:
1758         case AGGR_UNSET:
1759         default:
1760                 break;
1761         }
1762 
1763         return 0;
1764 }
1765 
1766 /*
1767  * Add default attributes, if there were no attributes specified or
1768  * if -d/--detailed, -d -d or -d -d -d is used:
1769  */
1770 static int add_default_attributes(void)
1771 {
1772         struct perf_event_attr default_attrs0[] = {
1773 
1774   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
1775   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
1776   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
1777   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
1778 
1779   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
1780 };
1781         struct perf_event_attr frontend_attrs[] = {
1782   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
1783 };
1784         struct perf_event_attr backend_attrs[] = {
1785   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
1786 };
1787         struct perf_event_attr default_attrs1[] = {
1788   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
1789   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
1790   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
1791 
1792 };
1793 
1794 /*
1795  * Detailed stats (-d), covering the L1 and last level data caches:
1796  */
1797         struct perf_event_attr detailed_attrs[] = {
1798 
1799   { .type = PERF_TYPE_HW_CACHE,
1800     .config =
1801          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1802         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1803         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1804 
1805   { .type = PERF_TYPE_HW_CACHE,
1806     .config =
1807          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1808         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1809         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1810 
1811   { .type = PERF_TYPE_HW_CACHE,
1812     .config =
1813          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1814         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1815         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1816 
1817   { .type = PERF_TYPE_HW_CACHE,
1818     .config =
1819          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1820         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1821         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1822 };
1823 
1824 /*
1825  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
1826  */
1827         struct perf_event_attr very_detailed_attrs[] = {
1828 
1829   { .type = PERF_TYPE_HW_CACHE,
1830     .config =
1831          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1832         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1833         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1834 
1835   { .type = PERF_TYPE_HW_CACHE,
1836     .config =
1837          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1838         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1839         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1840 
1841   { .type = PERF_TYPE_HW_CACHE,
1842     .config =
1843          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1844         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1845         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1846 
1847   { .type = PERF_TYPE_HW_CACHE,
1848     .config =
1849          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1850         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1851         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1852 
1853   { .type = PERF_TYPE_HW_CACHE,
1854     .config =
1855          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1856         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1857         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1858 
1859   { .type = PERF_TYPE_HW_CACHE,
1860     .config =
1861          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1862         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1863         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1864 
1865 };
1866 
1867 /*
1868  * Very, very detailed stats (-d -d -d), adding prefetch events:
1869  */
1870         struct perf_event_attr very_very_detailed_attrs[] = {
1871 
1872   { .type = PERF_TYPE_HW_CACHE,
1873     .config =
1874          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1875         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1876         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1877 
1878   { .type = PERF_TYPE_HW_CACHE,
1879     .config =
1880          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1881         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1882         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1883 };
1884 
1885         /* Set attrs if no event is selected and !null_run: */
1886         if (null_run)
1887                 return 0;
1888 
1889         if (transaction_run) {
1890                 int err;
1891                 if (pmu_have_event("cpu", "cycles-ct") &&
1892                     pmu_have_event("cpu", "el-start"))
1893                         err = parse_events(evsel_list, transaction_attrs, NULL);
1894                 else
1895                         err = parse_events(evsel_list, transaction_limited_attrs, NULL);
1896                 if (err) {
1897                         fprintf(stderr, "Cannot set up transaction events\n");
1898                         return -1;
1899                 }
1900                 return 0;
1901         }
1902 
1903         if (!evsel_list->nr_entries) {
1904                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
1905                         return -1;
1906                 if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
1907                         if (perf_evlist__add_default_attrs(evsel_list,
1908                                                 frontend_attrs) < 0)
1909                                 return -1;
1910                 }
1911                 if (pmu_have_event("cpu", "stalled-cycles-backend")) {
1912                         if (perf_evlist__add_default_attrs(evsel_list,
1913                                                 backend_attrs) < 0)
1914                                 return -1;
1915                 }
1916                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
1917                         return -1;
1918         }
1919 
1920         /* Detailed events get appended to the event list: */
1921 
1922         if (detailed_run <  1)
1923                 return 0;
1924 
1925         /* Append detailed run extra attributes: */
1926         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1927                 return -1;
1928 
1929         if (detailed_run < 2)
1930                 return 0;
1931 
1932         /* Append very detailed run extra attributes: */
1933         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1934                 return -1;
1935 
1936         if (detailed_run < 3)
1937                 return 0;
1938 
1939         /* Append very, very detailed run extra attributes: */
1940         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1941 }
1942 
1943 static const char * const stat_record_usage[] = {
1944         "perf stat record [<options>]",
1945         NULL,
1946 };
1947 
1948 static void init_features(struct perf_session *session)
1949 {
1950         int feat;
1951 
1952         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1953                 perf_header__set_feat(&session->header, feat);
1954 
1955         perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1956         perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1957         perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1958         perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1959 }
1960 
1961 static int __cmd_record(int argc, const char **argv)
1962 {
1963         struct perf_session *session;
1964         struct perf_data_file *file = &perf_stat.file;
1965 
1966         argc = parse_options(argc, argv, stat_options, stat_record_usage,
1967                              PARSE_OPT_STOP_AT_NON_OPTION);
1968 
1969         if (output_name)
1970                 file->path = output_name;
1971 
1972         if (run_count != 1 || forever) {
1973                 pr_err("Cannot use -r option with perf stat record.\n");
1974                 return -1;
1975         }
1976 
1977         session = perf_session__new(file, false, NULL);
1978         if (session == NULL) {
1979                 pr_err("Perf session creation failed.\n");
1980                 return -1;
1981         }
1982 
1983         init_features(session);
1984 
1985         session->evlist   = evsel_list;
1986         perf_stat.session = session;
1987         perf_stat.record  = true;
1988         return argc;
1989 }
1990 
1991 static int process_stat_round_event(struct perf_tool *tool __maybe_unused,
1992                                     union perf_event *event,
1993                                     struct perf_session *session)
1994 {
1995         struct stat_round_event *round = &event->stat_round;
1996         struct perf_evsel *counter;
1997         struct timespec tsh, *ts = NULL;
1998         const char **argv = session->header.env.cmdline_argv;
1999         int argc = session->header.env.nr_cmdline;
2000 
2001         evlist__for_each(evsel_list, counter)
2002                 perf_stat_process_counter(&stat_config, counter);
2003 
2004         if (round->type == PERF_STAT_ROUND_TYPE__FINAL)
2005                 update_stats(&walltime_nsecs_stats, round->time);
2006 
2007         if (stat_config.interval && round->time) {
2008                 tsh.tv_sec  = round->time / NSECS_PER_SEC;
2009                 tsh.tv_nsec = round->time % NSECS_PER_SEC;
2010                 ts = &tsh;
2011         }
2012 
2013         print_counters(ts, argc, argv);
2014         return 0;
2015 }
2016 
2017 static
2018 int process_stat_config_event(struct perf_tool *tool __maybe_unused,
2019                               union perf_event *event,
2020                               struct perf_session *session __maybe_unused)
2021 {
2022         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
2023 
2024         perf_event__read_stat_config(&stat_config, &event->stat_config);
2025 
2026         if (cpu_map__empty(st->cpus)) {
2027                 if (st->aggr_mode != AGGR_UNSET)
2028                         pr_warning("warning: processing task data, aggregation mode not set\n");
2029                 return 0;
2030         }
2031 
2032         if (st->aggr_mode != AGGR_UNSET)
2033                 stat_config.aggr_mode = st->aggr_mode;
2034 
2035         if (perf_stat.file.is_pipe)
2036                 perf_stat_init_aggr_mode();
2037         else
2038                 perf_stat_init_aggr_mode_file(st);
2039 
2040         return 0;
2041 }
2042 
2043 static int set_maps(struct perf_stat *st)
2044 {
2045         if (!st->cpus || !st->threads)
2046                 return 0;
2047 
2048         if (WARN_ONCE(st->maps_allocated, "stats double allocation\n"))
2049                 return -EINVAL;
2050 
2051         perf_evlist__set_maps(evsel_list, st->cpus, st->threads);
2052 
2053         if (perf_evlist__alloc_stats(evsel_list, true))
2054                 return -ENOMEM;
2055 
2056         st->maps_allocated = true;
2057         return 0;
2058 }
2059 
2060 static
2061 int process_thread_map_event(struct perf_tool *tool __maybe_unused,
2062                              union perf_event *event,
2063                              struct perf_session *session __maybe_unused)
2064 {
2065         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
2066 
2067         if (st->threads) {
2068                 pr_warning("Extra thread map event, ignoring.\n");
2069                 return 0;
2070         }
2071 
2072         st->threads = thread_map__new_event(&event->thread_map);
2073         if (!st->threads)
2074                 return -ENOMEM;
2075 
2076         return set_maps(st);
2077 }
2078 
2079 static
2080 int process_cpu_map_event(struct perf_tool *tool __maybe_unused,
2081                           union perf_event *event,
2082                           struct perf_session *session __maybe_unused)
2083 {
2084         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
2085         struct cpu_map *cpus;
2086 
2087         if (st->cpus) {
2088                 pr_warning("Extra cpu map event, ignoring.\n");
2089                 return 0;
2090         }
2091 
2092         cpus = cpu_map__new_data(&event->cpu_map.data);
2093         if (!cpus)
2094                 return -ENOMEM;
2095 
2096         st->cpus = cpus;
2097         return set_maps(st);
2098 }
2099 
2100 static const char * const stat_report_usage[] = {
2101         "perf stat report [<options>]",
2102         NULL,
2103 };
2104 
2105 static struct perf_stat perf_stat = {
2106         .tool = {
2107                 .attr           = perf_event__process_attr,
2108                 .event_update   = perf_event__process_event_update,
2109                 .thread_map     = process_thread_map_event,
2110                 .cpu_map        = process_cpu_map_event,
2111                 .stat_config    = process_stat_config_event,
2112                 .stat           = perf_event__process_stat_event,
2113                 .stat_round     = process_stat_round_event,
2114         },
2115         .aggr_mode = AGGR_UNSET,
2116 };
2117 
2118 static int __cmd_report(int argc, const char **argv)
2119 {
2120         struct perf_session *session;
2121         const struct option options[] = {
2122         OPT_STRING('i', "input", &input_name, "file", "input file name"),
2123         OPT_SET_UINT(0, "per-socket", &perf_stat.aggr_mode,
2124                      "aggregate counts per processor socket", AGGR_SOCKET),
2125         OPT_SET_UINT(0, "per-core", &perf_stat.aggr_mode,
2126                      "aggregate counts per physical processor core", AGGR_CORE),
2127         OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
2128                      "disable CPU count aggregation", AGGR_NONE),
2129         OPT_END()
2130         };
2131         struct stat st;
2132         int ret;
2133 
2134         argc = parse_options(argc, argv, options, stat_report_usage, 0);
2135 
2136         if (!input_name || !strlen(input_name)) {
2137                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
2138                         input_name = "-";
2139                 else
2140                         input_name = "perf.data";
2141         }
2142 
2143         perf_stat.file.path = input_name;
2144         perf_stat.file.mode = PERF_DATA_MODE_READ;
2145 
2146         session = perf_session__new(&perf_stat.file, false, &perf_stat.tool);
2147         if (session == NULL)
2148                 return -1;
2149 
2150         perf_stat.session  = session;
2151         stat_config.output = stderr;
2152         evsel_list         = session->evlist;
2153 
2154         ret = perf_session__process_events(session);
2155         if (ret)
2156                 return ret;
2157 
2158         perf_session__delete(session);
2159         return 0;
2160 }
2161 
2162 int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
2163 {
2164         const char * const stat_usage[] = {
2165                 "perf stat [<options>] [<command>]",
2166                 NULL
2167         };
2168         int status = -EINVAL, run_idx;
2169         const char *mode;
2170         FILE *output = stderr;
2171         unsigned int interval;
2172         const char * const stat_subcommands[] = { "record", "report" };
2173 
2174         setlocale(LC_ALL, "");
2175 
2176         evsel_list = perf_evlist__new();
2177         if (evsel_list == NULL)
2178                 return -ENOMEM;
2179 
2180         parse_events__shrink_config_terms();
2181         argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
2182                                         (const char **) stat_usage,
2183                                         PARSE_OPT_STOP_AT_NON_OPTION);
2184         perf_stat__init_shadow_stats();
2185 
2186         if (csv_sep) {
2187                 csv_output = true;
2188                 if (!strcmp(csv_sep, "\\t"))
2189                         csv_sep = "\t";
2190         } else
2191                 csv_sep = DEFAULT_SEPARATOR;
2192 
2193         if (argc && !strncmp(argv[0], "rec", 3)) {
2194                 argc = __cmd_record(argc, argv);
2195                 if (argc < 0)
2196                         return -1;
2197         } else if (argc && !strncmp(argv[0], "rep", 3))
2198                 return __cmd_report(argc, argv);
2199 
2200         interval = stat_config.interval;
2201 
2202         /*
2203          * For record command the -o is already taken care of.
2204          */
2205         if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
2206                 output = NULL;
2207 
2208         if (output_name && output_fd) {
2209                 fprintf(stderr, "cannot use both --output and --log-fd\n");
2210                 parse_options_usage(stat_usage, stat_options, "o", 1);
2211                 parse_options_usage(NULL, stat_options, "log-fd", 0);
2212                 goto out;
2213         }
2214 
2215         if (metric_only && stat_config.aggr_mode == AGGR_THREAD) {
2216                 fprintf(stderr, "--metric-only is not supported with --per-thread\n");
2217                 goto out;
2218         }
2219 
2220         if (metric_only && run_count > 1) {
2221                 fprintf(stderr, "--metric-only is not supported with -r\n");
2222                 goto out;
2223         }
2224 
2225         if (output_fd < 0) {
2226                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
2227                 parse_options_usage(stat_usage, stat_options, "log-fd", 0);
2228                 goto out;
2229         }
2230 
2231         if (!output) {
2232                 struct timespec tm;
2233                 mode = append_file ? "a" : "w";
2234 
2235                 output = fopen(output_name, mode);
2236                 if (!output) {
2237                         perror("failed to create output file");
2238                         return -1;
2239                 }
2240                 clock_gettime(CLOCK_REALTIME, &tm);
2241                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
2242         } else if (output_fd > 0) {
2243                 mode = append_file ? "a" : "w";
2244                 output = fdopen(output_fd, mode);
2245                 if (!output) {
2246                         perror("Failed opening logfd");
2247                         return -errno;
2248                 }
2249         }
2250 
2251         stat_config.output = output;
2252 
2253         /*
2254          * let the spreadsheet do the pretty-printing
2255          */
2256         if (csv_output) {
2257                 /* User explicitly passed -B? */
2258                 if (big_num_opt == 1) {
2259                         fprintf(stderr, "-B option not supported with -x\n");
2260                         parse_options_usage(stat_usage, stat_options, "B", 1);
2261                         parse_options_usage(NULL, stat_options, "x", 1);
2262                         goto out;
2263                 } else /* Nope, so disable big number formatting */
2264                         big_num = false;
2265         } else if (big_num_opt == 0) /* User passed --no-big-num */
2266                 big_num = false;
2267 
2268         if (!argc && target__none(&target))
2269                 usage_with_options(stat_usage, stat_options);
2270 
2271         if (run_count < 0) {
2272                 pr_err("Run count must be a positive number\n");
2273                 parse_options_usage(stat_usage, stat_options, "r", 1);
2274                 goto out;
2275         } else if (run_count == 0) {
2276                 forever = true;
2277                 run_count = 1;
2278         }
2279 
2280         if ((stat_config.aggr_mode == AGGR_THREAD) && !target__has_task(&target)) {
2281                 fprintf(stderr, "The --per-thread option is only available "
2282                         "when monitoring via -p -t options.\n");
2283                 parse_options_usage(NULL, stat_options, "p", 1);
2284                 parse_options_usage(NULL, stat_options, "t", 1);
2285                 goto out;
2286         }
2287 
2288         /*
2289          * no_aggr, cgroup are for system-wide only
2290          * --per-thread is aggregated per thread, we dont mix it with cpu mode
2291          */
2292         if (((stat_config.aggr_mode != AGGR_GLOBAL &&
2293               stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
2294             !target__has_cpu(&target)) {
2295                 fprintf(stderr, "both cgroup and no-aggregation "
2296                         "modes only available in system-wide mode\n");
2297 
2298                 parse_options_usage(stat_usage, stat_options, "G", 1);
2299                 parse_options_usage(NULL, stat_options, "A", 1);
2300                 parse_options_usage(NULL, stat_options, "a", 1);
2301                 goto out;
2302         }
2303 
2304         if (add_default_attributes())
2305                 goto out;
2306 
2307         target__validate(&target);
2308 
2309         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
2310                 if (target__has_task(&target)) {
2311                         pr_err("Problems finding threads of monitor\n");
2312                         parse_options_usage(stat_usage, stat_options, "p", 1);
2313                         parse_options_usage(NULL, stat_options, "t", 1);
2314                 } else if (target__has_cpu(&target)) {
2315                         perror("failed to parse CPUs map");
2316                         parse_options_usage(stat_usage, stat_options, "C", 1);
2317                         parse_options_usage(NULL, stat_options, "a", 1);
2318                 }
2319                 goto out;
2320         }
2321 
2322         /*
2323          * Initialize thread_map with comm names,
2324          * so we could print it out on output.
2325          */
2326         if (stat_config.aggr_mode == AGGR_THREAD)
2327                 thread_map__read_comms(evsel_list->threads);
2328 
2329         if (interval && interval < 100) {
2330                 if (interval < 10) {
2331                         pr_err("print interval must be >= 10ms\n");
2332                         parse_options_usage(stat_usage, stat_options, "I", 1);
2333                         goto out;
2334                 } else
2335                         pr_warning("print interval < 100ms. "
2336                                    "The overhead percentage could be high in some cases. "
2337                                    "Please proceed with caution.\n");
2338         }
2339 
2340         if (perf_evlist__alloc_stats(evsel_list, interval))
2341                 goto out;
2342 
2343         if (perf_stat_init_aggr_mode())
2344                 goto out;
2345 
2346         /*
2347          * We dont want to block the signals - that would cause
2348          * child tasks to inherit that and Ctrl-C would not work.
2349          * What we want is for Ctrl-C to work in the exec()-ed
2350          * task, but being ignored by perf stat itself:
2351          */
2352         atexit(sig_atexit);
2353         if (!forever)
2354                 signal(SIGINT,  skip_signal);
2355         signal(SIGCHLD, skip_signal);
2356         signal(SIGALRM, skip_signal);
2357         signal(SIGABRT, skip_signal);
2358 
2359         status = 0;
2360         for (run_idx = 0; forever || run_idx < run_count; run_idx++) {
2361                 if (run_count != 1 && verbose)
2362                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
2363                                 run_idx + 1);
2364 
2365                 status = run_perf_stat(argc, argv);
2366                 if (forever && status != -1) {
2367                         print_counters(NULL, argc, argv);
2368                         perf_stat__reset_stats();
2369                 }
2370         }
2371 
2372         if (!forever && status != -1 && !interval)
2373                 print_counters(NULL, argc, argv);
2374 
2375         if (STAT_RECORD) {
2376                 /*
2377                  * We synthesize the kernel mmap record just so that older tools
2378                  * don't emit warnings about not being able to resolve symbols
2379                  * due to /proc/sys/kernel/kptr_restrict settings and instear provide
2380                  * a saner message about no samples being in the perf.data file.
2381                  *
2382                  * This also serves to suppress a warning about f_header.data.size == 0
2383                  * in header.c at the moment 'perf stat record' gets introduced, which
2384                  * is not really needed once we start adding the stat specific PERF_RECORD_
2385                  * records, but the need to suppress the kptr_restrict messages in older
2386                  * tools remain  -acme
2387                  */
2388                 int fd = perf_data_file__fd(&perf_stat.file);
2389                 int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
2390                                                              process_synthesized_event,
2391                                                              &perf_stat.session->machines.host);
2392                 if (err) {
2393                         pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
2394                                    "older tools may produce warnings about this file\n.");
2395                 }
2396 
2397                 if (!interval) {
2398                         if (WRITE_STAT_ROUND_EVENT(walltime_nsecs_stats.max, FINAL))
2399                                 pr_err("failed to write stat round event\n");
2400                 }
2401 
2402                 if (!perf_stat.file.is_pipe) {
2403                         perf_stat.session->header.data_size += perf_stat.bytes_written;
2404                         perf_session__write_header(perf_stat.session, evsel_list, fd, true);
2405                 }
2406 
2407                 perf_session__delete(perf_stat.session);
2408         }
2409 
2410         perf_stat__exit_aggr_mode();
2411         perf_evlist__free_stats(evsel_list);
2412 out:
2413         perf_evlist__delete(evsel_list);
2414         return status;
2415 }
2416 

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