mirror of https://gitee.com/openkylin/linux.git
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include "tests.h"
|
|
#include "util/evsel.h"
|
|
#include "util/evlist.h"
|
|
#include "util/cpumap.h"
|
|
#include "util/thread_map.h"
|
|
|
|
#define NR_LOOPS 10000000
|
|
|
|
/*
|
|
* 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;
|
|
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,
|
|
};
|
|
|
|
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);
|
|
|
|
evlist->cpus = cpu_map__dummy_new();
|
|
evlist->threads = thread_map__new_by_tid(getpid());
|
|
if (!evlist->cpus || !evlist->threads) {
|
|
err = -ENOMEM;
|
|
pr_debug("Not enough memory to create thread/cpu maps\n");
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
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",
|
|
strerror(errno), knob, (u64)attr.sample_freq);
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
err = perf_evlist__mmap(evlist, 128, true);
|
|
if (err < 0) {
|
|
pr_debug("failed to mmap event: %d (%s)\n", errno,
|
|
strerror(errno));
|
|
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_delete_evlist:
|
|
perf_evlist__delete(evlist);
|
|
return err;
|
|
}
|
|
|
|
int test__sw_clock_freq(void)
|
|
{
|
|
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;
|
|
}
|