static int process_event(struct perf_evlist **pevlist, union perf_event *event) { struct perf_sample sample; if (event->header.type == PERF_RECORD_HEADER_ATTR) { if (perf_event__process_attr(NULL, event, pevlist)) { pr_debug("perf_event__process_attr failed\n"); return -1; } return 0; } if (event->header.type >= PERF_RECORD_USER_TYPE_START) return -1; if (!*pevlist) return -1; if (perf_evlist__parse_sample(*pevlist, event, &sample)) { pr_debug("perf_evlist__parse_sample failed\n"); return -1; } return 0; }
static int process_sample_event(struct machine *machine, struct perf_evlist *evlist, union perf_event *event, struct state *state) { struct perf_sample sample; struct thread *thread; u8 cpumode; int ret; if (perf_evlist__parse_sample(evlist, event, &sample)) { pr_debug("perf_evlist__parse_sample failed\n"); return -1; } thread = machine__findnew_thread(machine, sample.pid, sample.tid); if (!thread) { pr_debug("machine__findnew_thread failed\n"); return -1; } cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; ret = read_object_code(sample.ip, READLEN, cpumode, thread, state); thread__put(thread); return ret; }
static int process_sample_event(struct machine *machine, struct perf_evlist *evlist, union perf_event *event, struct state *state) { struct perf_sample sample; struct thread *thread; int ret; if (perf_evlist__parse_sample(evlist, event, &sample)) { pr_debug("perf_evlist__parse_sample failed\n"); return -1; } thread = machine__findnew_thread(machine, sample.pid, sample.tid); if (!thread) { pr_debug("machine__findnew_thread failed\n"); return -1; } ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread, state); thread__put(thread); return ret; }
int test__PERF_RECORD(int subtest __maybe_unused) { struct record_opts opts = { .target = { .uid = UINT_MAX, .uses_mmap = true, }, .no_buffering = true, .mmap_pages = 256, }; cpu_set_t cpu_mask; size_t cpu_mask_size = sizeof(cpu_mask); struct perf_evlist *evlist = perf_evlist__new_dummy(); struct perf_evsel *evsel; struct perf_sample sample; const char *cmd = "sleep"; const char *argv[] = { cmd, "1", NULL, }; char *bname, *mmap_filename; u64 prev_time = 0; bool found_cmd_mmap = false, found_libc_mmap = false, found_vdso_mmap = false, found_ld_mmap = false; int err = -1, errs = 0, i, wakeups = 0; u32 cpu; int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; char sbuf[STRERR_BUFSIZE]; if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ evlist = perf_evlist__new_default(); if (evlist == NULL || argv == NULL) { pr_debug("Not enough memory to create evlist\n"); goto out; } /* * Create maps of threads and cpus to monitor. In this case * we start with all threads and cpus (-1, -1) but then in * perf_evlist__prepare_workload we'll fill in the only thread * we're monitoring, the one forked there. */ err = perf_evlist__create_maps(evlist, &opts.target); if (err < 0) { pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_delete_evlist; } /* * Prepare the workload in argv[] to run, it'll fork it, and then wait * for perf_evlist__start_workload() to exec it. This is done this way * so that we have time to open the evlist (calling sys_perf_event_open * on all the fds) and then mmap them. */ err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); if (err < 0) { pr_debug("Couldn't run the workload!\n"); goto out_delete_evlist; } /* * Config the evsels, setting attr->comm on the first one, etc. */ evsel = perf_evlist__first(evlist); perf_evsel__set_sample_bit(evsel, CPU); perf_evsel__set_sample_bit(evsel, TID); perf_evsel__set_sample_bit(evsel, TIME); perf_evlist__config(evlist, &opts); err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); if (err < 0) { pr_debug("sched__get_first_possible_cpu: %s\n", strerror_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } cpu = err; /* * So that we can check perf_sample.cpu on all the samples. */ if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { pr_debug("sched_setaffinity: %s\n", strerror_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } /* * Call sys_perf_event_open on all the fds on all the evsels, * grouping them if asked to. */ err = perf_evlist__open(evlist); if (err < 0) { pr_debug("perf_evlist__open: %s\n", strerror_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } /* * mmap the first fd on a given CPU and ask for events for the other * fds in the same CPU to be injected in the same mmap ring buffer * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). */ err = perf_evlist__mmap(evlist, opts.mmap_pages, false); if (err < 0) { pr_debug("perf_evlist__mmap: %s\n", strerror_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } /* * Now that all is properly set up, enable the events, they will * count just on workload.pid, which will start... */ perf_evlist__enable(evlist); /* * Now! */ perf_evlist__start_workload(evlist); while (1) { int before = total_events; for (i = 0; i < evlist->nr_mmaps; i++) { union perf_event *event; while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { const u32 type = event->header.type; const char *name = perf_event__name(type); ++total_events; if (type < PERF_RECORD_MAX) nr_events[type]++; err = perf_evlist__parse_sample(evlist, event, &sample); if (err < 0) { if (verbose) perf_event__fprintf(event, stderr); pr_debug("Couldn't parse sample\n"); goto out_delete_evlist; } if (verbose) { pr_info("%" PRIu64" %d ", sample.time, sample.cpu); perf_event__fprintf(event, stderr); } if (prev_time > sample.time) { pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", name, prev_time, sample.time); ++errs; } prev_time = sample.time; if (sample.cpu != cpu) { pr_debug("%s with unexpected cpu, expected %d, got %d\n", name, cpu, sample.cpu); ++errs; } if ((pid_t)sample.pid != evlist->workload.pid) { pr_debug("%s with unexpected pid, expected %d, got %d\n", name, evlist->workload.pid, sample.pid); ++errs; } if ((pid_t)sample.tid != evlist->workload.pid) { pr_debug("%s with unexpected tid, expected %d, got %d\n", name, evlist->workload.pid, sample.tid); ++errs; } if ((type == PERF_RECORD_COMM || type == PERF_RECORD_MMAP || type == PERF_RECORD_MMAP2 || type == PERF_RECORD_FORK || type == PERF_RECORD_EXIT) && (pid_t)event->comm.pid != evlist->workload.pid) { pr_debug("%s with unexpected pid/tid\n", name); ++errs; } if ((type == PERF_RECORD_COMM || type == PERF_RECORD_MMAP || type == PERF_RECORD_MMAP2) && event->comm.pid != event->comm.tid) { pr_debug("%s with different pid/tid!\n", name); ++errs; } switch (type) { case PERF_RECORD_COMM: if (strcmp(event->comm.comm, cmd)) { pr_debug("%s with unexpected comm!\n", name); ++errs; } break; case PERF_RECORD_EXIT: goto found_exit; case PERF_RECORD_MMAP: mmap_filename = event->mmap.filename; goto check_bname; case PERF_RECORD_MMAP2: mmap_filename = event->mmap2.filename; check_bname: bname = strrchr(mmap_filename, '/'); if (bname != NULL) { if (!found_cmd_mmap) found_cmd_mmap = !strcmp(bname + 1, cmd); if (!found_libc_mmap) found_libc_mmap = !strncmp(bname + 1, "libc", 4); if (!found_ld_mmap) found_ld_mmap = !strncmp(bname + 1, "ld", 2); } else if (!found_vdso_mmap) found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); break; case PERF_RECORD_SAMPLE: /* Just ignore samples for now */ break; default: pr_debug("Unexpected perf_event->header.type %d!\n", type); ++errs; } perf_evlist__mmap_consume(evlist, i); } } /* * We don't use poll here because at least at 3.1 times the * PERF_RECORD_{!SAMPLE} events don't honour * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. */ if (total_events == before && false) perf_evlist__poll(evlist, -1); sleep(1); if (++wakeups > 5) { pr_debug("No PERF_RECORD_EXIT event!\n"); break; } } found_exit: if (nr_events[PERF_RECORD_COMM] > 1) { pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); ++errs; } if (nr_events[PERF_RECORD_COMM] == 0) { pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); ++errs; } if (!found_cmd_mmap) { pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); ++errs; } if (!found_libc_mmap) { pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); ++errs; } if (!found_ld_mmap) { pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); ++errs; } if (!found_vdso_mmap) { pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); ++errs; } out_delete_evlist: perf_evlist__delete(evlist); out: return (err < 0 || errs > 0) ? -1 : 0; }
/* * 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(void) { 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", "getpgrp", "getpgid", }; pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp, (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; 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], strerror(errno)); 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 (evsels[i] == NULL) { 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", strerror(errno)); 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, strerror(errno)); 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(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__delete(cpus); out_free_threads: thread_map__delete(threads); return err; }
/* * This test will open software clock events (cpu-clock, task-clock) * then check their frequency -> period conversion has no artifact of * setting period to 1 forcefully. */ static int __test__sw_clock_freq(enum perf_sw_ids clock_id) { int i, err = -1; volatile int tmp = 0; u64 total_periods = 0; int nr_samples = 0; char sbuf[STRERR_BUFSIZE]; union perf_event *event; struct perf_evsel *evsel; struct perf_evlist *evlist; struct perf_event_attr attr = { .type = PERF_TYPE_SOFTWARE, .config = clock_id, .sample_type = PERF_SAMPLE_PERIOD, .exclude_kernel = 1, .disabled = 1, .freq = 1, }; struct cpu_map *cpus; struct thread_map *threads; attr.sample_freq = 500; evlist = perf_evlist__new(); if (evlist == NULL) { pr_debug("perf_evlist__new\n"); return -1; } evsel = perf_evsel__new(&attr); if (evsel == NULL) { pr_debug("perf_evsel__new\n"); goto out_delete_evlist; } perf_evlist__add(evlist, evsel); cpus = cpu_map__dummy_new(); threads = thread_map__new_by_tid(getpid()); if (!cpus || !threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_free_maps; } perf_evlist__set_maps(evlist, cpus, threads); cpus = NULL; threads = NULL; if (perf_evlist__open(evlist)) { const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; err = -errno; pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", str_error_r(errno, sbuf, sizeof(sbuf)), knob, (u64)attr.sample_freq); goto out_delete_evlist; } err = perf_evlist__mmap(evlist, 128); if (err < 0) { pr_debug("failed to mmap event: %d (%s)\n", errno, str_error_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } perf_evlist__enable(evlist); /* collect samples */ for (i = 0; i < NR_LOOPS; i++) tmp++; perf_evlist__disable(evlist); while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { struct perf_sample sample; if (event->header.type != PERF_RECORD_SAMPLE) goto next_event; err = perf_evlist__parse_sample(evlist, event, &sample); if (err < 0) { pr_debug("Error during parse sample\n"); goto out_delete_evlist; } total_periods += sample.period; nr_samples++; next_event: perf_evlist__mmap_consume(evlist, 0); } if ((u64) nr_samples == total_periods) { pr_debug("All (%d) samples have period value of 1!\n", nr_samples); err = -1; } out_free_maps: cpu_map__put(cpus); thread_map__put(threads); out_delete_evlist: perf_evlist__delete(evlist); return err; } int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) { int ret; ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); if (!ret) ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); return ret; }