/* For the CLR_() macros */ #include #include "evlist.h" #include "evsel.h" #include "thread_map.h" #include "cpumap.h" #include "tests.h" #include /* * This test will generate random numbers of calls to some getpid syscalls, * then establish an mmap for a group of events that are created to monitor * the syscalls. * * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated * sample.id field to map back to its respective perf_evsel instance. * * Then it checks if the number of syscalls reported as perf events by * the kernel corresponds to the number of syscalls made. */ int test__basic_mmap(int subtest __maybe_unused) { int err = -1; union perf_event *event; struct thread_map *threads; struct cpu_map *cpus; struct perf_evlist *evlist; cpu_set_t cpu_set; const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; #define nsyscalls ARRAY_SIZE(syscall_names) unsigned int nr_events[nsyscalls], expected_nr_events[nsyscalls], i, j; struct perf_evsel *evsels[nsyscalls], *evsel; char sbuf[STRERR_BUFSIZE]; threads = thread_map__new(-1, getpid(), UINT_MAX); if (threads == NULL) { pr_debug("thread_map__new\n"); return -1; } cpus = cpu_map__new(NULL); if (cpus == NULL) { pr_debug("cpu_map__new\n"); goto out_free_threads; } CPU_ZERO(&cpu_set); CPU_SET(cpus->map[0], &cpu_set); sched_setaffinity(0, sizeof(cpu_set), &cpu_set); if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { pr_debug("sched_setaffinity() failed on CPU %d: %s ", cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf))); goto out_free_cpus; } evlist = perf_evlist__new(); if (evlist == NULL) { pr_debug("perf_evlist__new\n"); goto out_free_cpus; } perf_evlist__set_maps(evlist, cpus, threads); for (i = 0; i < nsyscalls; ++i) { char name[64]; snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); evsels[i] = perf_evsel__newtp("syscalls", name); if (IS_ERR(evsels[i])) { pr_debug("perf_evsel__new\n"); goto out_delete_evlist; } evsels[i]->attr.wakeup_events = 1; perf_evsel__set_sample_id(evsels[i], false); perf_evlist__add(evlist, evsels[i]); if (perf_evsel__open(evsels[i], cpus, threads) < 0) { pr_debug("failed to open counter: %s, " "tweak /proc/sys/kernel/perf_event_paranoid?\n", str_error_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } nr_events[i] = 0; expected_nr_events[i] = 1 + rand() % 127; } if (perf_evlist__mmap(evlist, 128, true) < 0) { pr_debug("failed to mmap events: %d (%s)\n", errno, str_error_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } for (i = 0; i < nsyscalls; ++i) for (j = 0; j < expected_nr_events[i]; ++j) { int foo = syscalls[i](); ++foo; } while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { struct perf_sample sample; if (event->header.type != PERF_RECORD_SAMPLE) { pr_debug("unexpected %s event\n", perf_event__name(event->header.type)); goto out_delete_evlist; } err = perf_evlist__parse_sample(evlist, event, &sample); if (err) { pr_err("Can't parse sample, err = %d\n", err); goto out_delete_evlist; } err = -1; evsel = perf_evlist__id2evsel(evlist, sample.id); if (evsel == NULL) { pr_debug("event with id %" PRIu64 " doesn't map to an evsel\n", sample.id); goto out_delete_evlist; } nr_events[evsel->idx]++; perf_evlist__mmap_consume(evlist, 0); } err = 0; evlist__for_each_entry(evlist, evsel) { if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { pr_debug("expected %d %s events, got %d\n", expected_nr_events[evsel->idx], perf_evsel__name(evsel), nr_events[evsel->idx]); err = -1; goto out_delete_evlist; } } out_delete_evlist: perf_evlist__delete(evlist); cpus = NULL; threads = NULL; out_free_cpus: cpu_map__put(cpus); out_free_threads: thread_map__put(threads); return err; } >context:space:mode:
Diffstat (limited to 'include/trace/events/vmscan.h')