109 строки
2.3 KiB
C
109 строки
2.3 KiB
C
#include "evlist.h"
|
|
#include "evsel.h"
|
|
#include "cpumap.h"
|
|
#include "parse-events.h"
|
|
|
|
typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
|
|
|
|
static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
|
|
{
|
|
struct perf_evlist *evlist;
|
|
struct perf_evsel *evsel;
|
|
int err = -EAGAIN, fd;
|
|
|
|
evlist = perf_evlist__new();
|
|
if (!evlist)
|
|
return -ENOMEM;
|
|
|
|
if (parse_events(evlist, str))
|
|
goto out_delete;
|
|
|
|
evsel = perf_evlist__first(evlist);
|
|
|
|
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
|
|
if (fd < 0)
|
|
goto out_delete;
|
|
close(fd);
|
|
|
|
fn(evsel);
|
|
|
|
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
|
|
if (fd < 0) {
|
|
if (errno == EINVAL)
|
|
err = -EINVAL;
|
|
goto out_delete;
|
|
}
|
|
close(fd);
|
|
err = 0;
|
|
|
|
out_delete:
|
|
perf_evlist__delete(evlist);
|
|
return err;
|
|
}
|
|
|
|
static bool perf_probe_api(setup_probe_fn_t fn)
|
|
{
|
|
const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
|
|
struct cpu_map *cpus;
|
|
int cpu, ret, i = 0;
|
|
|
|
cpus = cpu_map__new(NULL);
|
|
if (!cpus)
|
|
return false;
|
|
cpu = cpus->map[0];
|
|
cpu_map__delete(cpus);
|
|
|
|
do {
|
|
ret = perf_do_probe_api(fn, cpu, try[i++]);
|
|
if (!ret)
|
|
return true;
|
|
} while (ret == -EAGAIN && try[i]);
|
|
|
|
return false;
|
|
}
|
|
|
|
static void perf_probe_sample_identifier(struct perf_evsel *evsel)
|
|
{
|
|
evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
|
|
}
|
|
|
|
bool perf_can_sample_identifier(void)
|
|
{
|
|
return perf_probe_api(perf_probe_sample_identifier);
|
|
}
|
|
|
|
void perf_evlist__config(struct perf_evlist *evlist,
|
|
struct perf_record_opts *opts)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
bool use_sample_identifier = false;
|
|
|
|
/*
|
|
* Set the evsel leader links before we configure attributes,
|
|
* since some might depend on this info.
|
|
*/
|
|
if (opts->group)
|
|
perf_evlist__set_leader(evlist);
|
|
|
|
if (evlist->cpus->map[0] < 0)
|
|
opts->no_inherit = true;
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node)
|
|
perf_evsel__config(evsel, opts);
|
|
|
|
if (evlist->nr_entries > 1) {
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
if (evsel->attr.sample_type == first->attr.sample_type)
|
|
continue;
|
|
use_sample_identifier = perf_can_sample_identifier();
|
|
break;
|
|
}
|
|
list_for_each_entry(evsel, &evlist->entries, node)
|
|
perf_evsel__set_sample_id(evsel, use_sample_identifier);
|
|
}
|
|
|
|
perf_evlist__set_id_pos(evlist);
|
|
}
|