Root/tools/perf/builtin-stat.c

Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 9 years 7 months ago.
By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation.
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   Time: 0.104
11
12    Performance counter stats for '/home/mingo/hackbench':
13
14       1255.538611 task clock ticks # 10.143 CPU utilization factor
15             54011 context switches # 0.043 M/sec
16               385 CPU migrations # 0.000 M/sec
17             17755 pagefaults # 0.014 M/sec
18        3808323185 CPU cycles # 3033.219 M/sec
19        1575111190 instructions # 1254.530 M/sec
20          17367895 cache references # 13.833 M/sec
21           7674421 cache misses # 6.112 M/sec
22
23    Wall-clock time elapsed: 123.786620 msecs
24
25 *
26 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
27 *
28 * Improvements and fixes by:
29 *
30 * Arjan van de Ven <arjan@linux.intel.com>
31 * Yanmin Zhang <yanmin.zhang@intel.com>
32 * Wu Fengguang <fengguang.wu@intel.com>
33 * Mike Galbraith <efault@gmx.de>
34 * Paul Mackerras <paulus@samba.org>
35 * Jaswinder Singh Rajput <jaswinder@kernel.org>
36 *
37 * Released under the GPL v2. (and only v2, not any later version)
38 */
39
40#include "perf.h"
41#include "builtin.h"
42#include "util/util.h"
43#include "util/parse-options.h"
44#include "util/parse-events.h"
45#include "util/event.h"
46#include "util/evlist.h"
47#include "util/evsel.h"
48#include "util/debug.h"
49#include "util/header.h"
50#include "util/cpumap.h"
51#include "util/thread.h"
52#include "util/thread_map.h"
53
54#include <sys/prctl.h>
55#include <math.h>
56#include <locale.h>
57
58#define DEFAULT_SEPARATOR " "
59
60static struct perf_event_attr default_attrs[] = {
61
62  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
63  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
64  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
65  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
66
67  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
68  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
69  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
70  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
71  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES },
72  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
73
74};
75
76struct perf_evlist *evsel_list;
77
78static bool system_wide = false;
79static int run_idx = 0;
80
81static int run_count = 1;
82static bool no_inherit = false;
83static bool scale = true;
84static bool no_aggr = false;
85static pid_t target_pid = -1;
86static pid_t target_tid = -1;
87static pid_t child_pid = -1;
88static bool null_run = false;
89static bool big_num = true;
90static int big_num_opt = -1;
91static const char *cpu_list;
92static const char *csv_sep = NULL;
93static bool csv_output = false;
94
95static volatile int done = 0;
96
97struct stats
98{
99    double n, mean, M2;
100};
101
102struct perf_stat {
103    struct stats res_stats[3];
104};
105
106static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
107{
108    evsel->priv = zalloc(sizeof(struct perf_stat));
109    return evsel->priv == NULL ? -ENOMEM : 0;
110}
111
112static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
113{
114    free(evsel->priv);
115    evsel->priv = NULL;
116}
117
118static void update_stats(struct stats *stats, u64 val)
119{
120    double delta;
121
122    stats->n++;
123    delta = val - stats->mean;
124    stats->mean += delta / stats->n;
125    stats->M2 += delta*(val - stats->mean);
126}
127
128static double avg_stats(struct stats *stats)
129{
130    return stats->mean;
131}
132
133/*
134 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
135 *
136 * (\Sum n_i^2) - ((\Sum n_i)^2)/n
137 * s^2 = -------------------------------
138 * n - 1
139 *
140 * http://en.wikipedia.org/wiki/Stddev
141 *
142 * The std dev of the mean is related to the std dev by:
143 *
144 * s
145 * s_mean = -------
146 * sqrt(n)
147 *
148 */
149static double stddev_stats(struct stats *stats)
150{
151    double variance = stats->M2 / (stats->n - 1);
152    double variance_mean = variance / stats->n;
153
154    return sqrt(variance_mean);
155}
156
157struct stats runtime_nsecs_stats[MAX_NR_CPUS];
158struct stats runtime_cycles_stats[MAX_NR_CPUS];
159struct stats runtime_branches_stats[MAX_NR_CPUS];
160struct stats walltime_nsecs_stats;
161
162static int create_perf_stat_counter(struct perf_evsel *evsel)
163{
164    struct perf_event_attr *attr = &evsel->attr;
165
166    if (scale)
167        attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
168                    PERF_FORMAT_TOTAL_TIME_RUNNING;
169
170    attr->inherit = !no_inherit;
171
172    if (system_wide)
173        return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false);
174
175    if (target_pid == -1 && target_tid == -1) {
176        attr->disabled = 1;
177        attr->enable_on_exec = 1;
178    }
179
180    return perf_evsel__open_per_thread(evsel, evsel_list->threads, false);
181}
182
183/*
184 * Does the counter have nsecs as a unit?
185 */
186static inline int nsec_counter(struct perf_evsel *evsel)
187{
188    if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
189        perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
190        return 1;
191
192    return 0;
193}
194
195/*
196 * Read out the results of a single counter:
197 * aggregate counts across CPUs in system-wide mode
198 */
199static int read_counter_aggr(struct perf_evsel *counter)
200{
201    struct perf_stat *ps = counter->priv;
202    u64 *count = counter->counts->aggr.values;
203    int i;
204
205    if (__perf_evsel__read(counter, evsel_list->cpus->nr,
206                   evsel_list->threads->nr, scale) < 0)
207        return -1;
208
209    for (i = 0; i < 3; i++)
210        update_stats(&ps->res_stats[i], count[i]);
211
212    if (verbose) {
213        fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
214            event_name(counter), count[0], count[1], count[2]);
215    }
216
217    /*
218     * Save the full runtime - to allow normalization during printout:
219     */
220    if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
221        update_stats(&runtime_nsecs_stats[0], count[0]);
222    if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
223        update_stats(&runtime_cycles_stats[0], count[0]);
224    if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
225        update_stats(&runtime_branches_stats[0], count[0]);
226
227    return 0;
228}
229
230/*
231 * Read out the results of a single counter:
232 * do not aggregate counts across CPUs in system-wide mode
233 */
234static int read_counter(struct perf_evsel *counter)
235{
236    u64 *count;
237    int cpu;
238
239    for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
240        if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
241            return -1;
242
243        count = counter->counts->cpu[cpu].values;
244
245        if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
246            update_stats(&runtime_nsecs_stats[cpu], count[0]);
247        if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
248            update_stats(&runtime_cycles_stats[cpu], count[0]);
249        if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
250            update_stats(&runtime_branches_stats[cpu], count[0]);
251    }
252
253    return 0;
254}
255
256static int run_perf_stat(int argc __used, const char **argv)
257{
258    unsigned long long t0, t1;
259    struct perf_evsel *counter;
260    int status = 0;
261    int child_ready_pipe[2], go_pipe[2];
262    const bool forks = (argc > 0);
263    char buf;
264
265    if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
266        perror("failed to create pipes");
267        exit(1);
268    }
269
270    if (forks) {
271        if ((child_pid = fork()) < 0)
272            perror("failed to fork");
273
274        if (!child_pid) {
275            close(child_ready_pipe[0]);
276            close(go_pipe[1]);
277            fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
278
279            /*
280             * Do a dummy execvp to get the PLT entry resolved,
281             * so we avoid the resolver overhead on the real
282             * execvp call.
283             */
284            execvp("", (char **)argv);
285
286            /*
287             * Tell the parent we're ready to go
288             */
289            close(child_ready_pipe[1]);
290
291            /*
292             * Wait until the parent tells us to go.
293             */
294            if (read(go_pipe[0], &buf, 1) == -1)
295                perror("unable to read pipe");
296
297            execvp(argv[0], (char **)argv);
298
299            perror(argv[0]);
300            exit(-1);
301        }
302
303        if (target_tid == -1 && target_pid == -1 && !system_wide)
304            evsel_list->threads->map[0] = child_pid;
305
306        /*
307         * Wait for the child to be ready to exec.
308         */
309        close(child_ready_pipe[1]);
310        close(go_pipe[0]);
311        if (read(child_ready_pipe[0], &buf, 1) == -1)
312            perror("unable to read pipe");
313        close(child_ready_pipe[0]);
314    }
315
316    list_for_each_entry(counter, &evsel_list->entries, node) {
317        if (create_perf_stat_counter(counter) < 0) {
318            if (errno == -EPERM || errno == -EACCES) {
319                error("You may not have permission to collect %sstats.\n"
320                      "\t Consider tweaking"
321                      " /proc/sys/kernel/perf_event_paranoid or running as root.",
322                      system_wide ? "system-wide " : "");
323            } else if (errno == ENOENT) {
324                error("%s event is not supported. ", event_name(counter));
325            } else {
326                error("open_counter returned with %d (%s). "
327                      "/bin/dmesg may provide additional information.\n",
328                       errno, strerror(errno));
329            }
330            if (child_pid != -1)
331                kill(child_pid, SIGTERM);
332            die("Not all events could be opened.\n");
333            return -1;
334        }
335    }
336
337    if (perf_evlist__set_filters(evsel_list)) {
338        error("failed to set filter with %d (%s)\n", errno,
339            strerror(errno));
340        return -1;
341    }
342
343    /*
344     * Enable counters and exec the command:
345     */
346    t0 = rdclock();
347
348    if (forks) {
349        close(go_pipe[1]);
350        wait(&status);
351    } else {
352        while(!done) sleep(1);
353    }
354
355    t1 = rdclock();
356
357    update_stats(&walltime_nsecs_stats, t1 - t0);
358
359    if (no_aggr) {
360        list_for_each_entry(counter, &evsel_list->entries, node) {
361            read_counter(counter);
362            perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
363        }
364    } else {
365        list_for_each_entry(counter, &evsel_list->entries, node) {
366            read_counter_aggr(counter);
367            perf_evsel__close_fd(counter, evsel_list->cpus->nr,
368                         evsel_list->threads->nr);
369        }
370    }
371
372    return WEXITSTATUS(status);
373}
374
375static void print_noise(struct perf_evsel *evsel, double avg)
376{
377    struct perf_stat *ps;
378
379    if (run_count == 1)
380        return;
381
382    ps = evsel->priv;
383    fprintf(stderr, " ( +- %7.3f%% )",
384            100 * stddev_stats(&ps->res_stats[0]) / avg);
385}
386
387static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
388{
389    double msecs = avg / 1e6;
390    char cpustr[16] = { '\0', };
391    const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";
392
393    if (no_aggr)
394        sprintf(cpustr, "CPU%*d%s",
395            csv_output ? 0 : -4,
396            evsel_list->cpus->map[cpu], csv_sep);
397
398    fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
399
400    if (evsel->cgrp)
401        fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
402
403    if (csv_output)
404        return;
405
406    if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
407        fprintf(stderr, " # %10.3f CPUs ",
408                avg / avg_stats(&walltime_nsecs_stats));
409}
410
411static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
412{
413    double total, ratio = 0.0;
414    char cpustr[16] = { '\0', };
415    const char *fmt;
416
417    if (csv_output)
418        fmt = "%s%.0f%s%s";
419    else if (big_num)
420        fmt = "%s%'18.0f%s%-24s";
421    else
422        fmt = "%s%18.0f%s%-24s";
423
424    if (no_aggr)
425        sprintf(cpustr, "CPU%*d%s",
426            csv_output ? 0 : -4,
427            evsel_list->cpus->map[cpu], csv_sep);
428    else
429        cpu = 0;
430
431    fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
432
433    if (evsel->cgrp)
434        fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
435
436    if (csv_output)
437        return;
438
439    if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
440        total = avg_stats(&runtime_cycles_stats[cpu]);
441
442        if (total)
443            ratio = avg / total;
444
445        fprintf(stderr, " # %10.3f IPC ", ratio);
446    } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
447            runtime_branches_stats[cpu].n != 0) {
448        total = avg_stats(&runtime_branches_stats[cpu]);
449
450        if (total)
451            ratio = avg * 100 / total;
452
453        fprintf(stderr, " # %10.3f %% ", ratio);
454
455    } else if (runtime_nsecs_stats[cpu].n != 0) {
456        total = avg_stats(&runtime_nsecs_stats[cpu]);
457
458        if (total)
459            ratio = 1000.0 * avg / total;
460
461        fprintf(stderr, " # %10.3f M/sec", ratio);
462    }
463}
464
465/*
466 * Print out the results of a single counter:
467 * aggregated counts in system-wide mode
468 */
469static void print_counter_aggr(struct perf_evsel *counter)
470{
471    struct perf_stat *ps = counter->priv;
472    double avg = avg_stats(&ps->res_stats[0]);
473    int scaled = counter->counts->scaled;
474
475    if (scaled == -1) {
476        fprintf(stderr, "%*s%s%*s",
477            csv_output ? 0 : 18,
478            "<not counted>",
479            csv_sep,
480            csv_output ? 0 : -24,
481            event_name(counter));
482
483        if (counter->cgrp)
484            fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
485
486        fputc('\n', stderr);
487        return;
488    }
489
490    if (nsec_counter(counter))
491        nsec_printout(-1, counter, avg);
492    else
493        abs_printout(-1, counter, avg);
494
495    if (csv_output) {
496        fputc('\n', stderr);
497        return;
498    }
499
500    print_noise(counter, avg);
501
502    if (scaled) {
503        double avg_enabled, avg_running;
504
505        avg_enabled = avg_stats(&ps->res_stats[1]);
506        avg_running = avg_stats(&ps->res_stats[2]);
507
508        fprintf(stderr, " (scaled from %.2f%%)",
509                100 * avg_running / avg_enabled);
510    }
511    fprintf(stderr, "\n");
512}
513
514/*
515 * Print out the results of a single counter:
516 * does not use aggregated count in system-wide
517 */
518static void print_counter(struct perf_evsel *counter)
519{
520    u64 ena, run, val;
521    int cpu;
522
523    for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
524        val = counter->counts->cpu[cpu].val;
525        ena = counter->counts->cpu[cpu].ena;
526        run = counter->counts->cpu[cpu].run;
527        if (run == 0 || ena == 0) {
528            fprintf(stderr, "CPU%*d%s%*s%s%*s",
529                csv_output ? 0 : -4,
530                evsel_list->cpus->map[cpu], csv_sep,
531                csv_output ? 0 : 18,
532                "<not counted>", csv_sep,
533                csv_output ? 0 : -24,
534                event_name(counter));
535
536            if (counter->cgrp)
537                fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
538
539            fputc('\n', stderr);
540            continue;
541        }
542
543        if (nsec_counter(counter))
544            nsec_printout(cpu, counter, val);
545        else
546            abs_printout(cpu, counter, val);
547
548        if (!csv_output) {
549            print_noise(counter, 1.0);
550
551            if (run != ena) {
552                fprintf(stderr, " (scaled from %.2f%%)",
553                    100.0 * run / ena);
554            }
555        }
556        fputc('\n', stderr);
557    }
558}
559
560static void print_stat(int argc, const char **argv)
561{
562    struct perf_evsel *counter;
563    int i;
564
565    fflush(stdout);
566
567    if (!csv_output) {
568        fprintf(stderr, "\n");
569        fprintf(stderr, " Performance counter stats for ");
570        if(target_pid == -1 && target_tid == -1) {
571            fprintf(stderr, "\'%s", argv[0]);
572            for (i = 1; i < argc; i++)
573                fprintf(stderr, " %s", argv[i]);
574        } else if (target_pid != -1)
575            fprintf(stderr, "process id \'%d", target_pid);
576        else
577            fprintf(stderr, "thread id \'%d", target_tid);
578
579        fprintf(stderr, "\'");
580        if (run_count > 1)
581            fprintf(stderr, " (%d runs)", run_count);
582        fprintf(stderr, ":\n\n");
583    }
584
585    if (no_aggr) {
586        list_for_each_entry(counter, &evsel_list->entries, node)
587            print_counter(counter);
588    } else {
589        list_for_each_entry(counter, &evsel_list->entries, node)
590            print_counter_aggr(counter);
591    }
592
593    if (!csv_output) {
594        fprintf(stderr, "\n");
595        fprintf(stderr, " %18.9f seconds time elapsed",
596                avg_stats(&walltime_nsecs_stats)/1e9);
597        if (run_count > 1) {
598            fprintf(stderr, " ( +- %7.3f%% )",
599                100*stddev_stats(&walltime_nsecs_stats) /
600                avg_stats(&walltime_nsecs_stats));
601        }
602        fprintf(stderr, "\n\n");
603    }
604}
605
606static volatile int signr = -1;
607
608static void skip_signal(int signo)
609{
610    if(child_pid == -1)
611        done = 1;
612
613    signr = signo;
614}
615
616static void sig_atexit(void)
617{
618    if (child_pid != -1)
619        kill(child_pid, SIGTERM);
620
621    if (signr == -1)
622        return;
623
624    signal(signr, SIG_DFL);
625    kill(getpid(), signr);
626}
627
628static const char * const stat_usage[] = {
629    "perf stat [<options>] [<command>]",
630    NULL
631};
632
633static int stat__set_big_num(const struct option *opt __used,
634                 const char *s __used, int unset)
635{
636    big_num_opt = unset ? 0 : 1;
637    return 0;
638}
639
640static const struct option options[] = {
641    OPT_CALLBACK('e', "event", &evsel_list, "event",
642             "event selector. use 'perf list' to list available events",
643             parse_events),
644    OPT_CALLBACK(0, "filter", &evsel_list, "filter",
645             "event filter", parse_filter),
646    OPT_BOOLEAN('i', "no-inherit", &no_inherit,
647            "child tasks do not inherit counters"),
648    OPT_INTEGER('p', "pid", &target_pid,
649            "stat events on existing process id"),
650    OPT_INTEGER('t', "tid", &target_tid,
651            "stat events on existing thread id"),
652    OPT_BOOLEAN('a', "all-cpus", &system_wide,
653            "system-wide collection from all CPUs"),
654    OPT_BOOLEAN('c', "scale", &scale,
655            "scale/normalize counters"),
656    OPT_INCR('v', "verbose", &verbose,
657            "be more verbose (show counter open errors, etc)"),
658    OPT_INTEGER('r', "repeat", &run_count,
659            "repeat command and print average + stddev (max: 100)"),
660    OPT_BOOLEAN('n', "null", &null_run,
661            "null run - dont start any counters"),
662    OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
663               "print large numbers with thousands\' separators",
664               stat__set_big_num),
665    OPT_STRING('C', "cpu", &cpu_list, "cpu",
666            "list of cpus to monitor in system-wide"),
667    OPT_BOOLEAN('A', "no-aggr", &no_aggr,
668            "disable CPU count aggregation"),
669    OPT_STRING('x', "field-separator", &csv_sep, "separator",
670           "print counts with custom separator"),
671    OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
672             "monitor event in cgroup name only",
673             parse_cgroups),
674    OPT_END()
675};
676
677int cmd_stat(int argc, const char **argv, const char *prefix __used)
678{
679    struct perf_evsel *pos;
680    int status = -ENOMEM;
681
682    setlocale(LC_ALL, "");
683
684    evsel_list = perf_evlist__new(NULL, NULL);
685    if (evsel_list == NULL)
686        return -ENOMEM;
687
688    argc = parse_options(argc, argv, options, stat_usage,
689        PARSE_OPT_STOP_AT_NON_OPTION);
690
691    if (csv_sep)
692        csv_output = true;
693    else
694        csv_sep = DEFAULT_SEPARATOR;
695
696    /*
697     * let the spreadsheet do the pretty-printing
698     */
699    if (csv_output) {
700        /* User explicitely passed -B? */
701        if (big_num_opt == 1) {
702            fprintf(stderr, "-B option not supported with -x\n");
703            usage_with_options(stat_usage, options);
704        } else /* Nope, so disable big number formatting */
705            big_num = false;
706    } else if (big_num_opt == 0) /* User passed --no-big-num */
707        big_num = false;
708
709    if (!argc && target_pid == -1 && target_tid == -1)
710        usage_with_options(stat_usage, options);
711    if (run_count <= 0)
712        usage_with_options(stat_usage, options);
713
714    /* no_aggr, cgroup are for system-wide only */
715    if ((no_aggr || nr_cgroups) && !system_wide) {
716        fprintf(stderr, "both cgroup and no-aggregation "
717            "modes only available in system-wide mode\n");
718
719        usage_with_options(stat_usage, options);
720    }
721
722    /* Set attrs and nr_counters if no event is selected and !null_run */
723    if (!null_run && !evsel_list->nr_entries) {
724        size_t c;
725
726        for (c = 0; c < ARRAY_SIZE(default_attrs); ++c) {
727            pos = perf_evsel__new(&default_attrs[c], c);
728            if (pos == NULL)
729                goto out;
730            perf_evlist__add(evsel_list, pos);
731        }
732    }
733
734    if (target_pid != -1)
735        target_tid = target_pid;
736
737    evsel_list->threads = thread_map__new(target_pid, target_tid);
738    if (evsel_list->threads == NULL) {
739        pr_err("Problems finding threads of monitor\n");
740        usage_with_options(stat_usage, options);
741    }
742
743    if (system_wide)
744        evsel_list->cpus = cpu_map__new(cpu_list);
745    else
746        evsel_list->cpus = cpu_map__dummy_new();
747
748    if (evsel_list->cpus == NULL) {
749        perror("failed to parse CPUs map");
750        usage_with_options(stat_usage, options);
751        return -1;
752    }
753
754    list_for_each_entry(pos, &evsel_list->entries, node) {
755        if (perf_evsel__alloc_stat_priv(pos) < 0 ||
756            perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
757            perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
758            goto out_free_fd;
759    }
760
761    /*
762     * We dont want to block the signals - that would cause
763     * child tasks to inherit that and Ctrl-C would not work.
764     * What we want is for Ctrl-C to work in the exec()-ed
765     * task, but being ignored by perf stat itself:
766     */
767    atexit(sig_atexit);
768    signal(SIGINT, skip_signal);
769    signal(SIGALRM, skip_signal);
770    signal(SIGABRT, skip_signal);
771
772    status = 0;
773    for (run_idx = 0; run_idx < run_count; run_idx++) {
774        if (run_count != 1 && verbose)
775            fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
776        status = run_perf_stat(argc, argv);
777    }
778
779    if (status != -1)
780        print_stat(argc, argv);
781out_free_fd:
782    list_for_each_entry(pos, &evsel_list->entries, node)
783        perf_evsel__free_stat_priv(pos);
784    perf_evlist__delete_maps(evsel_list);
785out:
786    perf_evlist__delete(evsel_list);
787    return status;
788}
789

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