~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/tests/mmap-basic.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.14 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.57 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.138 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.193 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #include "evlist.h"
  2 #include "evsel.h"
  3 #include "thread_map.h"
  4 #include "cpumap.h"
  5 #include "tests.h"
  6 #include <linux/err.h>
  7 
  8 /*
  9  * This test will generate random numbers of calls to some getpid syscalls,
 10  * then establish an mmap for a group of events that are created to monitor
 11  * the syscalls.
 12  *
 13  * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
 14  * sample.id field to map back to its respective perf_evsel instance.
 15  *
 16  * Then it checks if the number of syscalls reported as perf events by
 17  * the kernel corresponds to the number of syscalls made.
 18  */
 19 int test__basic_mmap(int subtest __maybe_unused)
 20 {
 21         int err = -1;
 22         union perf_event *event;
 23         struct thread_map *threads;
 24         struct cpu_map *cpus;
 25         struct perf_evlist *evlist;
 26         cpu_set_t cpu_set;
 27         const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
 28         pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
 29 #define nsyscalls ARRAY_SIZE(syscall_names)
 30         unsigned int nr_events[nsyscalls],
 31                      expected_nr_events[nsyscalls], i, j;
 32         struct perf_evsel *evsels[nsyscalls], *evsel;
 33         char sbuf[STRERR_BUFSIZE];
 34 
 35         threads = thread_map__new(-1, getpid(), UINT_MAX);
 36         if (threads == NULL) {
 37                 pr_debug("thread_map__new\n");
 38                 return -1;
 39         }
 40 
 41         cpus = cpu_map__new(NULL);
 42         if (cpus == NULL) {
 43                 pr_debug("cpu_map__new\n");
 44                 goto out_free_threads;
 45         }
 46 
 47         CPU_ZERO(&cpu_set);
 48         CPU_SET(cpus->map[0], &cpu_set);
 49         sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
 50         if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
 51                 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
 52                          cpus->map[0], strerror_r(errno, sbuf, sizeof(sbuf)));
 53                 goto out_free_cpus;
 54         }
 55 
 56         evlist = perf_evlist__new();
 57         if (evlist == NULL) {
 58                 pr_debug("perf_evlist__new\n");
 59                 goto out_free_cpus;
 60         }
 61 
 62         perf_evlist__set_maps(evlist, cpus, threads);
 63 
 64         for (i = 0; i < nsyscalls; ++i) {
 65                 char name[64];
 66 
 67                 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
 68                 evsels[i] = perf_evsel__newtp("syscalls", name);
 69                 if (IS_ERR(evsels[i])) {
 70                         pr_debug("perf_evsel__new\n");
 71                         goto out_delete_evlist;
 72                 }
 73 
 74                 evsels[i]->attr.wakeup_events = 1;
 75                 perf_evsel__set_sample_id(evsels[i], false);
 76 
 77                 perf_evlist__add(evlist, evsels[i]);
 78 
 79                 if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
 80                         pr_debug("failed to open counter: %s, "
 81                                  "tweak /proc/sys/kernel/perf_event_paranoid?\n",
 82                                  strerror_r(errno, sbuf, sizeof(sbuf)));
 83                         goto out_delete_evlist;
 84                 }
 85 
 86                 nr_events[i] = 0;
 87                 expected_nr_events[i] = 1 + rand() % 127;
 88         }
 89 
 90         if (perf_evlist__mmap(evlist, 128, true) < 0) {
 91                 pr_debug("failed to mmap events: %d (%s)\n", errno,
 92                          strerror_r(errno, sbuf, sizeof(sbuf)));
 93                 goto out_delete_evlist;
 94         }
 95 
 96         for (i = 0; i < nsyscalls; ++i)
 97                 for (j = 0; j < expected_nr_events[i]; ++j) {
 98                         int foo = syscalls[i]();
 99                         ++foo;
100                 }
101 
102         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
103                 struct perf_sample sample;
104 
105                 if (event->header.type != PERF_RECORD_SAMPLE) {
106                         pr_debug("unexpected %s event\n",
107                                  perf_event__name(event->header.type));
108                         goto out_delete_evlist;
109                 }
110 
111                 err = perf_evlist__parse_sample(evlist, event, &sample);
112                 if (err) {
113                         pr_err("Can't parse sample, err = %d\n", err);
114                         goto out_delete_evlist;
115                 }
116 
117                 err = -1;
118                 evsel = perf_evlist__id2evsel(evlist, sample.id);
119                 if (evsel == NULL) {
120                         pr_debug("event with id %" PRIu64
121                                  " doesn't map to an evsel\n", sample.id);
122                         goto out_delete_evlist;
123                 }
124                 nr_events[evsel->idx]++;
125                 perf_evlist__mmap_consume(evlist, 0);
126         }
127 
128         err = 0;
129         evlist__for_each(evlist, evsel) {
130                 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
131                         pr_debug("expected %d %s events, got %d\n",
132                                  expected_nr_events[evsel->idx],
133                                  perf_evsel__name(evsel), nr_events[evsel->idx]);
134                         err = -1;
135                         goto out_delete_evlist;
136                 }
137         }
138 
139 out_delete_evlist:
140         perf_evlist__delete(evlist);
141         cpus    = NULL;
142         threads = NULL;
143 out_free_cpus:
144         cpu_map__put(cpus);
145 out_free_threads:
146         thread_map__put(threads);
147         return err;
148 }
149 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp