Example #1
0
/**
 * perf_evlist__set_id_pos - set the positions of event ids.
 * @evlist: selected event list
 *
 * Events with compatible sample types all have the same id_pos
 * and is_pos.  For convenience, put a copy on evlist.
 */
void perf_evlist__set_id_pos(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);

	evlist->id_pos = first->id_pos;
	evlist->is_pos = first->is_pos;
}
Example #2
0
static int perf_evsel__roundtrip_cache_name_test(void)
{
	char name[128];
	int type, op, err = 0, ret = 0, i, idx;
	struct perf_evsel *evsel;
	struct perf_evlist *evlist = perf_evlist__new();

        if (evlist == NULL)
                return -ENOMEM;

	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
			/* skip invalid cache type */
			if (!perf_evsel__is_cache_op_valid(type, op))
				continue;

			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
				__perf_evsel__hw_cache_type_op_res_name(type, op, i,
									name, sizeof(name));
				err = parse_events(evlist, name);
				if (err)
					ret = err;
			}
		}
	}

	idx = 0;
	evsel = perf_evlist__first(evlist);

	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
			/* skip invalid cache type */
			if (!perf_evsel__is_cache_op_valid(type, op))
				continue;

			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
				__perf_evsel__hw_cache_type_op_res_name(type, op, i,
									name, sizeof(name));
				if (evsel->idx != idx)
					continue;

				++idx;

				if (strcmp(perf_evsel__name(evsel), name)) {
					pr_debug("%s != %s\n", perf_evsel__name(evsel), name);
					ret = -1;
				}

				evsel = perf_evsel__next(evsel);
			}
		}
	}

	perf_evlist__delete(evlist);
	return ret;
}
Example #3
0
/**
 * test__keep_tracking - test using a dummy software event to keep tracking.
 *
 * This function implements a test that checks that tracking events continue
 * when an event is disabled but a dummy software event is not disabled.  If the
 * test passes %0 is returned, otherwise %-1 is returned.
 */
int test__keep_tracking(void)
{
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 4000,
		.target		     = {
			.uses_mmap   = true,
		},
	};
	struct thread_map *threads = NULL;
	struct cpu_map *cpus = NULL;
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	int found, err = -1;
	const char *comm;

	threads = thread_map__new(-1, getpid(), UINT_MAX);
	CHECK_NOT_NULL__(threads);

	cpus = cpu_map__new(NULL);
	CHECK_NOT_NULL__(cpus);

	evlist = perf_evlist__new();
	CHECK_NOT_NULL__(evlist);

	perf_evlist__set_maps(evlist, cpus, threads);

	CHECK__(parse_events(evlist, "dummy:u", NULL));
	CHECK__(parse_events(evlist, "cycles:u", NULL));

	perf_evlist__config(evlist, &opts);

	evsel = perf_evlist__first(evlist);

	evsel->attr.comm = 1;
	evsel->attr.disabled = 1;
	evsel->attr.enable_on_exec = 0;

	if (perf_evlist__open(evlist) < 0) {
		fprintf(stderr, " (not supported)");
		err = 0;
		goto out_err;
	}

	CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));

	/*
	 * First, test that a 'comm' event can be found when the event is
	 * enabled.
	 */

	perf_evlist__enable(evlist);

	comm = "Test COMM 1";
	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));

	perf_evlist__disable(evlist);

	found = find_comm(evlist, comm);
	if (found != 1) {
		pr_debug("First time, failed to find tracking event.\n");
		goto out_err;
	}

	/*
	 * Secondly, test that a 'comm' event can be found when the event is
	 * disabled with the dummy event still enabled.
	 */

	perf_evlist__enable(evlist);

	evsel = perf_evlist__last(evlist);

	CHECK__(perf_evlist__disable_event(evlist, evsel));

	comm = "Test COMM 2";
	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));

	perf_evlist__disable(evlist);

	found = find_comm(evlist, comm);
	if (found != 1) {
		pr_debug("Seconf time, failed to find tracking event.\n");
		goto out_err;
	}

	err = 0;

out_err:
	if (evlist) {
		perf_evlist__disable(evlist);
		perf_evlist__delete(evlist);
	} else {
		cpu_map__put(cpus);
		thread_map__put(threads);
	}

	return err;
}
Example #4
0
/*
 * Create an event group that contains both a sampled hardware
 * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
 * wait for the hardware perf counter to overflow and generate a PMI,
 * which triggers an event read for both of the events in the group.
 *
 * Since reading Intel CQM event counters requires sending SMP IPIs, the
 * CQM pmu needs to handle the above situation gracefully, and return
 * the last read counter value to avoid triggering a WARN_ON_ONCE() in
 * smp_call_function_many() caused by sending IPIs from NMI context.
 */
int test__intel_cqm_count_nmi_context(int subtest __maybe_unused)
{
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	struct perf_event_attr pe;
	int i, fd[2], flag, ret;
	size_t mmap_len;
	void *event;
	pid_t pid;
	int err = TEST_FAIL;

	flag = perf_event_open_cloexec_flag();

	evlist = perf_evlist__new();
	if (!evlist) {
		pr_debug("perf_evlist__new failed\n");
		return TEST_FAIL;
	}

	ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
	if (ret) {
		pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
		err = TEST_SKIP;
		goto out;
	}

	evsel = perf_evlist__first(evlist);
	if (!evsel) {
		pr_debug("perf_evlist__first failed\n");
		goto out;
	}

	memset(&pe, 0, sizeof(pe));
	pe.size = sizeof(pe);

	pe.type = PERF_TYPE_HARDWARE;
	pe.config = PERF_COUNT_HW_CPU_CYCLES;
	pe.read_format = PERF_FORMAT_GROUP;

	pe.sample_period = 128;
	pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;

	pid = spawn();

	fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
	if (fd[0] < 0) {
		pr_debug("failed to open event\n");
		goto out;
	}

	memset(&pe, 0, sizeof(pe));
	pe.size = sizeof(pe);

	pe.type = evsel->attr.type;
	pe.config = evsel->attr.config;

	fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
	if (fd[1] < 0) {
		pr_debug("failed to open event\n");
		goto out;
	}

	/*
	 * Pick a power-of-two number of pages + 1 for the meta-data
	 * page (struct perf_event_mmap_page). See tools/perf/design.txt.
	 */
	mmap_len = page_size * 65;

	event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
	if (event == (void *)(-1)) {
		pr_debug("failed to mmap %d\n", errno);
		goto out;
	}

	sleep(1);

	err = TEST_OK;

	munmap(event, mmap_len);

	for (i = 0; i < 2; i++)
		close(fd[i]);

	kill(pid, SIGKILL);
	wait(NULL);
out:
	perf_evlist__delete(evlist);
	return err;
}
Example #5
0
static int do_test_code_reading(bool try_kcore)
{
	struct machines machines;
	struct machine *machine;
	struct thread *thread;
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 4000,
		.target		     = {
			.uses_mmap   = true,
		},
	};
	struct state state = {
		.done_cnt = 0,
	};
	struct thread_map *threads = NULL;
	struct cpu_map *cpus = NULL;
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	int err = -1, ret;
	pid_t pid;
	struct map *map;
	bool have_vmlinux, have_kcore, excl_kernel = false;

	pid = getpid();

	machines__init(&machines);
	machine = &machines.host;

	ret = machine__create_kernel_maps(machine);
	if (ret < 0) {
		pr_debug("machine__create_kernel_maps failed\n");
		goto out_err;
	}

	/* Force the use of kallsyms instead of vmlinux to try kcore */
	if (try_kcore)
		symbol_conf.kallsyms_name = "/proc/kallsyms";

	/* Load kernel map */
	map = machine->vmlinux_maps[MAP__FUNCTION];
	ret = map__load(map, NULL);
	if (ret < 0) {
		pr_debug("map__load failed\n");
		goto out_err;
	}
	have_vmlinux = dso__is_vmlinux(map->dso);
	have_kcore = dso__is_kcore(map->dso);

	/* 2nd time through we just try kcore */
	if (try_kcore && !have_kcore)
		return TEST_CODE_READING_NO_KCORE;

	/* No point getting kernel events if there is no kernel object */
	if (!have_vmlinux && !have_kcore)
		excl_kernel = true;

	threads = thread_map__new_by_tid(pid);
	if (!threads) {
		pr_debug("thread_map__new_by_tid failed\n");
		goto out_err;
	}

	ret = perf_event__synthesize_thread_map(NULL, threads,
						perf_event__process, machine, false);
	if (ret < 0) {
		pr_debug("perf_event__synthesize_thread_map failed\n");
		goto out_err;
	}

	thread = machine__findnew_thread(machine, pid, pid);
	if (!thread) {
		pr_debug("machine__findnew_thread failed\n");
		goto out_err;
	}

	cpus = cpu_map__new(NULL);
	if (!cpus) {
		pr_debug("cpu_map__new failed\n");
		goto out_err;
	}

	while (1) {
		const char *str;

		evlist = perf_evlist__new();
		if (!evlist) {
			pr_debug("perf_evlist__new failed\n");
			goto out_err;
		}

		perf_evlist__set_maps(evlist, cpus, threads);

		if (excl_kernel)
			str = "cycles:u";
		else
			str = "cycles";
		pr_debug("Parsing event '%s'\n", str);
		ret = parse_events(evlist, str);
		if (ret < 0) {
			pr_debug("parse_events failed\n");
			goto out_err;
		}

		perf_evlist__config(evlist, &opts);

		evsel = perf_evlist__first(evlist);

		evsel->attr.comm = 1;
		evsel->attr.disabled = 1;
		evsel->attr.enable_on_exec = 0;

		ret = perf_evlist__open(evlist);
		if (ret < 0) {
			if (!excl_kernel) {
				excl_kernel = true;
				perf_evlist__set_maps(evlist, NULL, NULL);
				perf_evlist__delete(evlist);
				evlist = NULL;
				continue;
			}
			pr_debug("perf_evlist__open failed\n");
			goto out_err;
		}
		break;
	}

	ret = perf_evlist__mmap(evlist, UINT_MAX, false);
	if (ret < 0) {
		pr_debug("perf_evlist__mmap failed\n");
		goto out_err;
	}

	perf_evlist__enable(evlist);

	do_something();

	perf_evlist__disable(evlist);

	ret = process_events(machine, evlist, &state);
	if (ret < 0)
		goto out_err;

	if (!have_vmlinux && !have_kcore && !try_kcore)
		err = TEST_CODE_READING_NO_KERNEL_OBJ;
	else if (!have_vmlinux && !try_kcore)
		err = TEST_CODE_READING_NO_VMLINUX;
	else if (excl_kernel)
		err = TEST_CODE_READING_NO_ACCESS;
	else
		err = TEST_CODE_READING_OK;
out_err:
	if (evlist) {
		perf_evlist__delete(evlist);
	} else {
		cpu_map__delete(cpus);
		thread_map__delete(threads);
	}
	machines__destroy_kernel_maps(&machines);
	machine__delete_threads(machine);
	machines__exit(&machines);

	return err;
}

int test__code_reading(void)
{
	int ret;

	ret = do_test_code_reading(false);
	if (!ret)
		ret = do_test_code_reading(true);

	switch (ret) {
	case TEST_CODE_READING_OK:
		return 0;
	case TEST_CODE_READING_NO_VMLINUX:
		fprintf(stderr, " (no vmlinux)");
		return 0;
	case TEST_CODE_READING_NO_KCORE:
		fprintf(stderr, " (no kcore)");
		return 0;
	case TEST_CODE_READING_NO_ACCESS:
		fprintf(stderr, " (no access)");
		return 0;
	case TEST_CODE_READING_NO_KERNEL_OBJ:
		fprintf(stderr, " (no kernel obj)");
		return 0;
	default:
		return -1;
	};
}
Example #6
0
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 start a workload that does nothing then it checks
 * if the number of exit event reported by the kernel is 1 or not
 * in order to check the kernel returns correct number of event.
 */
int test__task_exit(void)
{
	int err = -1;
	union perf_event *event;
	struct perf_evsel *evsel;
	struct perf_evlist *evlist;
	struct perf_target target = {
		.uid		= UINT_MAX,
		.uses_mmap	= true,
	};
	const char *argv[] = { "true", NULL };

	signal(SIGCHLD, sig_handler);
	signal(SIGUSR1, sig_handler);

	evlist = perf_evlist__new();
	if (evlist == NULL) {
		pr_debug("perf_evlist__new\n");
		return -1;
	}
	/*
	 * We need at least one evsel in the evlist, use the default
	 * one: "cycles".
	 */
	err = perf_evlist__add_default(evlist);
	if (err < 0) {
		pr_debug("Not enough memory to create evsel\n");
		goto out_free_evlist;
	}

	/*
	 * 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.
	 */
	evlist->cpus = cpu_map__dummy_new();
	evlist->threads = thread_map__new_by_tid(-1);
	if (!evlist->cpus || !evlist->threads) {
		err = -ENOMEM;
		pr_debug("Not enough memory to create thread/cpu maps\n");
		goto out_delete_maps;
	}

	err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
	if (err < 0) {
		pr_debug("Couldn't run the workload!\n");
		goto out_delete_maps;
	}

	evsel = perf_evlist__first(evlist);
	evsel->attr.task = 1;
	evsel->attr.sample_freq = 0;
	evsel->attr.inherit = 0;
	evsel->attr.watermark = 0;
	evsel->attr.wakeup_events = 1;
	evsel->attr.exclude_kernel = 1;

	err = perf_evlist__open(evlist);
	if (err < 0) {
		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
		goto out_delete_maps;
	}

	if (perf_evlist__mmap(evlist, 128, true) < 0) {
		pr_debug("failed to mmap events: %d (%s)\n", errno,
			 strerror(errno));
		goto out_close_evlist;
	}

	perf_evlist__start_workload(evlist);

retry:
	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
		if (event->header.type != PERF_RECORD_EXIT)
			continue;

		nr_exit++;
	}

	if (!exited || !nr_exit) {
		poll(evlist->pollfd, evlist->nr_fds, -1);
		goto retry;
	}

	if (nr_exit != 1) {
		pr_debug("received %d EXIT records\n", nr_exit);
		err = -1;
	}

	perf_evlist__munmap(evlist);
out_close_evlist:
	perf_evlist__close(evlist);
out_delete_maps:
	perf_evlist__delete_maps(evlist);
out_free_evlist:
	perf_evlist__delete(evlist);
	return err;
}
Example #8
0
	CHECK_NOT_NULL__(threads);

	cpus = cpu_map__new(NULL);
	CHECK_NOT_NULL__(cpus);

	evlist = perf_evlist__new();
	CHECK_NOT_NULL__(evlist);

	perf_evlist__set_maps(evlist, cpus, threads);

	CHECK__(parse_events(evlist, "dummy:u", NULL));
	CHECK__(parse_events(evlist, "cycles:u", NULL));

	perf_evlist__config(evlist, &opts, NULL);

	evsel = perf_evlist__first(evlist);

	evsel->attr.comm = 1;
	evsel->attr.disabled = 1;
	evsel->attr.enable_on_exec = 0;

	if (perf_evlist__open(evlist) < 0) {
		pr_debug("Unable to open dummy and cycles event\n");
		err = TEST_SKIP;
		goto out_err;
	}

	CHECK__(perf_evlist__mmap(evlist, UINT_MAX));

	/*
	 * First, test that a 'comm' event can be found when the event is
Example #9
0
/**
 * test__perf_time_to_tsc - test converting perf time to TSC.
 *
 * This function implements a test that checks that the conversion of perf time
 * to and from TSC is consistent with the order of events.  If the test passes
 * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
 * supported then then the test passes but " (not supported)" is printed.
 */
int test__perf_time_to_tsc(void)
{
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 4000,
		.target		     = {
			.uses_mmap   = true,
		},
		.sample_time	     = true,
	};
	struct thread_map *threads = NULL;
	struct cpu_map *cpus = NULL;
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	int err = -1, ret, i;
	const char *comm1, *comm2;
	struct perf_tsc_conversion tc;
	struct perf_event_mmap_page *pc;
	union perf_event *event;
	u64 test_tsc, comm1_tsc, comm2_tsc;
	u64 test_time, comm1_time = 0, comm2_time = 0;

	threads = thread_map__new(-1, getpid(), UINT_MAX);
	CHECK_NOT_NULL__(threads);

	cpus = cpu_map__new(NULL);
	CHECK_NOT_NULL__(cpus);

	evlist = perf_evlist__new();
	CHECK_NOT_NULL__(evlist);

	perf_evlist__set_maps(evlist, cpus, threads);

	CHECK__(parse_events(evlist, "cycles:u", NULL));

	perf_evlist__config(evlist, &opts);

	evsel = perf_evlist__first(evlist);

	evsel->attr.comm = 1;
	evsel->attr.disabled = 1;
	evsel->attr.enable_on_exec = 0;

	CHECK__(perf_evlist__open(evlist));

	CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));

	pc = evlist->mmap[0].base;
	ret = perf_read_tsc_conversion(pc, &tc);
	if (ret) {
		if (ret == -EOPNOTSUPP) {
			fprintf(stderr, " (not supported)");
			return 0;
		}
		goto out_err;
	}

	perf_evlist__enable(evlist);

	comm1 = "Test COMM 1";
	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));

	test_tsc = rdtsc();

	comm2 = "Test COMM 2";
	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));

	perf_evlist__disable(evlist);

	for (i = 0; i < evlist->nr_mmaps; i++) {
		while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
			struct perf_sample sample;

			if (event->header.type != PERF_RECORD_COMM ||
			    (pid_t)event->comm.pid != getpid() ||
			    (pid_t)event->comm.tid != getpid())
				goto next_event;

			if (strcmp(event->comm.comm, comm1) == 0) {
				CHECK__(perf_evsel__parse_sample(evsel, event,
								 &sample));
				comm1_time = sample.time;
			}
			if (strcmp(event->comm.comm, comm2) == 0) {
				CHECK__(perf_evsel__parse_sample(evsel, event,
								 &sample));
				comm2_time = sample.time;
			}
next_event:
			perf_evlist__mmap_consume(evlist, i);
		}
	}

	if (!comm1_time || !comm2_time)
		goto out_err;

	test_time = tsc_to_perf_time(test_tsc, &tc);
	comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
	comm2_tsc = perf_time_to_tsc(comm2_time, &tc);

	pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
		 comm1_time, comm1_tsc);
	pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
		 test_time, test_tsc);
	pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
		 comm2_time, comm2_tsc);

	if (test_time <= comm1_time ||
	    test_time >= comm2_time)
		goto out_err;

	if (test_tsc <= comm1_tsc ||
	    test_tsc >= comm2_tsc)
		goto out_err;

	err = 0;

out_err:
	if (evlist) {
		perf_evlist__disable(evlist);
		perf_evlist__delete(evlist);
	}

	return err;
}
Example #10
0
static int do_test_code_reading(bool try_kcore)
{
	struct machine *machine;
	struct thread *thread;
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 500,
		.target		     = {
			.uses_mmap   = true,
		},
	};
	struct state state = {
		.done_cnt = 0,
	};
	struct thread_map *threads = NULL;
	struct cpu_map *cpus = NULL;
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	int err = -1, ret;
	pid_t pid;
	struct map *map;
	bool have_vmlinux, have_kcore, excl_kernel = false;

	pid = getpid();

	machine = machine__new_host();

	ret = machine__create_kernel_maps(machine);
	if (ret < 0) {
		pr_debug("machine__create_kernel_maps failed\n");
		goto out_err;
	}

	/* Force the use of kallsyms instead of vmlinux to try kcore */
	if (try_kcore)
		symbol_conf.kallsyms_name = "/proc/kallsyms";

	/* Load kernel map */
	map = machine__kernel_map(machine);
	ret = map__load(map, NULL);
	if (ret < 0) {
		pr_debug("map__load failed\n");
		goto out_err;
	}
	have_vmlinux = dso__is_vmlinux(map->dso);
	have_kcore = dso__is_kcore(map->dso);

	/* 2nd time through we just try kcore */
	if (try_kcore && !have_kcore)
		return TEST_CODE_READING_NO_KCORE;

	/* No point getting kernel events if there is no kernel object */
	if (!have_vmlinux && !have_kcore)
		excl_kernel = true;

	threads = thread_map__new_by_tid(pid);
	if (!threads) {
		pr_debug("thread_map__new_by_tid failed\n");
		goto out_err;
	}

	ret = perf_event__synthesize_thread_map(NULL, threads,
						perf_event__process, machine, false, 500);
	if (ret < 0) {
		pr_debug("perf_event__synthesize_thread_map failed\n");
		goto out_err;
	}

	thread = machine__findnew_thread(machine, pid, pid);
	if (!thread) {
		pr_debug("machine__findnew_thread failed\n");
		goto out_put;
	}

	cpus = cpu_map__new(NULL);
	if (!cpus) {
		pr_debug("cpu_map__new failed\n");
		goto out_put;
	}

	while (1) {
		const char *str;

		evlist = perf_evlist__new();
		if (!evlist) {
			pr_debug("perf_evlist__new failed\n");
			goto out_put;
		}

		perf_evlist__set_maps(evlist, cpus, threads);

		if (excl_kernel)
			str = "cycles:u";
		else
			str = "cycles";
		pr_debug("Parsing event '%s'\n", str);
		ret = parse_events(evlist, str, NULL);
		if (ret < 0) {
			pr_debug("parse_events failed\n");
			goto out_put;
		}

		perf_evlist__config(evlist, &opts);

		evsel = perf_evlist__first(evlist);

		evsel->attr.comm = 1;
		evsel->attr.disabled = 1;
		evsel->attr.enable_on_exec = 0;

		ret = perf_evlist__open(evlist);
		if (ret < 0) {
			if (!excl_kernel) {
				excl_kernel = true;
				/*
				 * Both cpus and threads are now owned by evlist
				 * and will be freed by following perf_evlist__set_maps
				 * call. Getting refference to keep them alive.
				 */
				cpu_map__get(cpus);
				thread_map__get(threads);
				perf_evlist__set_maps(evlist, NULL, NULL);
				perf_evlist__delete(evlist);
				evlist = NULL;
				continue;
			}

			if (verbose) {
				char errbuf[512];
				perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
				pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
			}

			goto out_put;
		}
		break;
	}

	ret = perf_evlist__mmap(evlist, UINT_MAX, false);
	if (ret < 0) {
		pr_debug("perf_evlist__mmap failed\n");
		goto out_put;
	}

	perf_evlist__enable(evlist);

	do_something();

	perf_evlist__disable(evlist);

	ret = process_events(machine, evlist, &state);
	if (ret < 0)
		goto out_put;

	if (!have_vmlinux && !have_kcore && !try_kcore)
		err = TEST_CODE_READING_NO_KERNEL_OBJ;
	else if (!have_vmlinux && !try_kcore)
		err = TEST_CODE_READING_NO_VMLINUX;
	else if (excl_kernel)
		err = TEST_CODE_READING_NO_ACCESS;
	else
		err = TEST_CODE_READING_OK;
out_put:
	thread__put(thread);
out_err:

	if (evlist) {
		perf_evlist__delete(evlist);
	} else {
		cpu_map__put(cpus);
		thread_map__put(threads);
	}
	machine__delete_threads(machine);
	machine__delete(machine);

	return err;
}

int test__code_reading(int subtest __maybe_unused)
{
	int ret;

	ret = do_test_code_reading(false);
	if (!ret)
		ret = do_test_code_reading(true);

	switch (ret) {
	case TEST_CODE_READING_OK:
		return 0;
	case TEST_CODE_READING_NO_VMLINUX:
		pr_debug("no vmlinux\n");
		return 0;
	case TEST_CODE_READING_NO_KCORE:
		pr_debug("no kcore\n");
		return 0;
	case TEST_CODE_READING_NO_ACCESS:
		pr_debug("no access\n");
		return 0;
	case TEST_CODE_READING_NO_KERNEL_OBJ:
		pr_debug("no kernel obj\n");
		return 0;
	default:
		return -1;
	};
}
Example #11
0
static bool perf_top__handle_keypress(struct perf_top *top, int c)
{
	bool ret = true;

	if (!perf_top__key_mapped(top, c)) {
		struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
		struct termios save;

		perf_top__print_mapped_keys(top);
		fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
		fflush(stdout);

		set_term_quiet_input(&save);

		poll(&stdin_poll, 1, -1);
		c = getc(stdin);

		tcsetattr(0, TCSAFLUSH, &save);
		if (!perf_top__key_mapped(top, c))
			return ret;
	}

	switch (c) {
		case 'd':
			prompt_integer(&top->delay_secs, "Enter display delay");
			if (top->delay_secs < 1)
				top->delay_secs = 1;
			break;
		case 'e':
			prompt_integer(&top->print_entries, "Enter display entries (lines)");
			if (top->print_entries == 0) {
				perf_top__resize(top);
				signal(SIGWINCH, winch_sig);
			} else {
				signal(SIGWINCH, SIG_DFL);
			}
			break;
		case 'E':
			if (top->evlist->nr_entries > 1) {
				/* Select 0 as the default event: */
				int counter = 0;

				fprintf(stderr, "\nAvailable events:");

				evlist__for_each_entry(top->evlist, top->sym_evsel)
					fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));

				prompt_integer(&counter, "Enter details event counter");

				if (counter >= top->evlist->nr_entries) {
					top->sym_evsel = perf_evlist__first(top->evlist);
					fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
					sleep(1);
					break;
				}
				evlist__for_each_entry(top->evlist, top->sym_evsel)
					if (top->sym_evsel->idx == counter)
						break;
			} else
				top->sym_evsel = perf_evlist__first(top->evlist);
			break;
		case 'f':
			prompt_integer(&top->count_filter, "Enter display event count filter");
			break;
		case 'F':
			prompt_percent(&top->annotation_opts.min_pcnt,
				       "Enter details display event filter (percent)");
			break;
		case 'K':
			top->hide_kernel_symbols = !top->hide_kernel_symbols;
			break;
		case 'q':
		case 'Q':
			printf("exiting.\n");
			if (top->dump_symtab)
				perf_session__fprintf_dsos(top->session, stderr);
			ret = false;
			break;
		case 's':
			perf_top__prompt_symbol(top, "Enter details symbol");
			break;
		case 'S':
			if (!top->sym_filter_entry)
				break;
			else {
				struct hist_entry *syme = top->sym_filter_entry;

				top->sym_filter_entry = NULL;
				__zero_source_counters(syme);
			}
			break;
		case 'U':
			top->hide_user_symbols = !top->hide_user_symbols;
			break;
		case 'z':
			top->zero = !top->zero;
			break;
		default:
			break;
	}