mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 20:32:22 +00:00
bc96b361cb
This test case checks frequency conversion of hrtimer-based software clock events (cpu-clock, task-clock) have valid (non-1) periods. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1363574507-18808-2-git-send-email-namhyung@kernel.org [ committer note: Moved .sample_freq to outside named init block to cope with some gcc versions ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
120 lines
2.5 KiB
C
120 lines
2.5 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 1000000
|
|
|
|
/*
|
|
* 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 = 10000;
|
|
|
|
evlist = perf_evlist__new();
|
|
if (evlist == NULL) {
|
|
pr_debug("perf_evlist__new\n");
|
|
return -1;
|
|
}
|
|
|
|
evsel = perf_evsel__new(&attr, 0);
|
|
if (evsel == NULL) {
|
|
pr_debug("perf_evsel__new\n");
|
|
goto out_free_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_maps;
|
|
}
|
|
|
|
perf_evlist__open(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_close_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)
|
|
continue;
|
|
|
|
err = perf_evlist__parse_sample(evlist, event, &sample);
|
|
if (err < 0) {
|
|
pr_debug("Error during parse sample\n");
|
|
goto out_unmap_evlist;
|
|
}
|
|
|
|
total_periods += sample.period;
|
|
nr_samples++;
|
|
}
|
|
|
|
if ((u64) nr_samples == total_periods) {
|
|
pr_debug("All (%d) samples have period value of 1!\n",
|
|
nr_samples);
|
|
err = -1;
|
|
}
|
|
|
|
out_unmap_evlist:
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|