static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
evlist__for_each(evlist, evsel)
perf_evsel__calc_id_pos(evsel);
perf_evlist__set_id_pos(evlist);
}
static void handle_initial_delay(void)
{
struct perf_evsel *counter;
if (initial_delay) {
const int ncpus = cpu_map__nr(evsel_list->cpus),
nthreads = thread_map__nr(evsel_list->threads);
usleep(initial_delay * 1000);
evlist__for_each(evsel_list, counter)
perf_evsel__enable(counter, ncpus, nthreads);
}
}
static int __cmd_evlist(const char *file_name, struct perf_attr_details *details)
{
struct perf_session *session;
struct perf_evsel *pos;
struct perf_data_file file = {
.path = file_name,
.mode = PERF_DATA_MODE_READ,
.force = details->force,
};
session = perf_session__new(&file, 0, NULL);
if (session == NULL)
return -1;
evlist__for_each(session->evlist, pos)
perf_evsel__fprintf(pos, details, stdout);
perf_session__delete(session);
return 0;
}
int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
{
struct perf_attr_details details = { .verbose = false, };
const struct option options[] = {
OPT_STRING('i', "input", &input_name, "file", "Input file name"),
OPT_BOOLEAN('F', "freq", &details.freq, "Show the sample frequency"),
OPT_BOOLEAN('v', "verbose", &details.verbose,
"Show all event attr details"),
OPT_BOOLEAN('g', "group", &details.event_group,
"Show event group information"),
OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),
OPT_END()
};
const char * const evlist_usage[] = {
"perf evlist [<options>]",
NULL
};
argc = parse_options(argc, argv, options, evlist_usage, 0);
if (argc)
usage_with_options(evlist_usage, options);
if (details.event_group && (details.verbose || details.freq)) {
usage_with_options_msg(evlist_usage, options,
"--group option is not compatible with other options\n");
}
return __cmd_evlist(input_name, &details);
}
int test__backward_ring_buffer(int subtest __maybe_unused)
{
int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
char pid[16], sbuf[STRERR_BUFSIZE];
struct perf_evlist *evlist;
struct perf_evsel *evsel __maybe_unused;
struct parse_events_error parse_error;
struct record_opts opts = {
.target = {
.uid = UINT_MAX,
.uses_mmap = true,
},
.freq = 0,
.mmap_pages = 256,
.default_interval = 1,
};
snprintf(pid, sizeof(pid), "%d", getpid());
pid[sizeof(pid) - 1] = '\0';
opts.target.tid = opts.target.pid = pid;
evlist = perf_evlist__new();
if (!evlist) {
pr_debug("No ehough memory to create evlist\n");
return TEST_FAIL;
}
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;
}
bzero(&parse_error, sizeof(parse_error));
err = parse_events(evlist, "syscalls:sys_enter_prctl", &parse_error);
if (err) {
pr_debug("Failed to parse tracepoint event, try use root\n");
ret = TEST_SKIP;
goto out_delete_evlist;
}
perf_evlist__config(evlist, &opts, NULL);
/* Set backward bit, ring buffer should be writing from end */
evlist__for_each(evlist, evsel)
evsel->attr.write_backward = 1;
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;
}
ret = TEST_FAIL;
err = do_test(evlist, opts.mmap_pages, &sample_count,
&comm_count);
if (err != TEST_OK)
goto out_delete_evlist;
if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
sample_count, comm_count);
goto out_delete_evlist;
}
err = do_test(evlist, 1, &sample_count, &comm_count);
if (err != TEST_OK)
goto out_delete_evlist;
ret = TEST_OK;
out_delete_evlist:
perf_evlist__delete(evlist);
return ret;
}
