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81f17c90f1
This way we'll be able to pass more test specific parameters without having to change this function signature. Will be used by the upcoming 'shell tests', shell scripts that will call perf tools and check if they work as expected, comparing its effects on the system (think 'perf probe foo') the output produced, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Thomas Richter <tmricht@linux.vnet.ibm.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-wq250w7j1opbzyiynozuajbl@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
136 lines
3 KiB
C
136 lines
3 KiB
C
#include <errno.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include "tests.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/cpumap.h"
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#include "util/thread_map.h"
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#define NR_LOOPS 10000000
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/*
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* This test will open software clock events (cpu-clock, task-clock)
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* then check their frequency -> period conversion has no artifact of
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* setting period to 1 forcefully.
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*/
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static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
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{
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int i, err = -1;
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volatile int tmp = 0;
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u64 total_periods = 0;
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int nr_samples = 0;
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char sbuf[STRERR_BUFSIZE];
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union perf_event *event;
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struct perf_evsel *evsel;
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struct perf_evlist *evlist;
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struct perf_event_attr attr = {
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.type = PERF_TYPE_SOFTWARE,
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.config = clock_id,
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.sample_type = PERF_SAMPLE_PERIOD,
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.exclude_kernel = 1,
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.disabled = 1,
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.freq = 1,
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};
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struct cpu_map *cpus;
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struct thread_map *threads;
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attr.sample_freq = 500;
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evlist = perf_evlist__new();
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if (evlist == NULL) {
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pr_debug("perf_evlist__new\n");
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return -1;
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}
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evsel = perf_evsel__new(&attr);
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if (evsel == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_delete_evlist;
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}
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perf_evlist__add(evlist, evsel);
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cpus = cpu_map__dummy_new();
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threads = thread_map__new_by_tid(getpid());
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if (!cpus || !threads) {
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err = -ENOMEM;
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_free_maps;
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}
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perf_evlist__set_maps(evlist, cpus, threads);
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cpus = NULL;
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threads = NULL;
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if (perf_evlist__open(evlist)) {
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const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
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err = -errno;
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pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
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str_error_r(errno, sbuf, sizeof(sbuf)),
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knob, (u64)attr.sample_freq);
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goto out_delete_evlist;
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}
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err = perf_evlist__mmap(evlist, 128, true);
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if (err < 0) {
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pr_debug("failed to mmap event: %d (%s)\n", errno,
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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perf_evlist__enable(evlist);
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/* collect samples */
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for (i = 0; i < NR_LOOPS; i++)
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tmp++;
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perf_evlist__disable(evlist);
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while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
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struct perf_sample sample;
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if (event->header.type != PERF_RECORD_SAMPLE)
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goto next_event;
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err = perf_evlist__parse_sample(evlist, event, &sample);
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if (err < 0) {
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pr_debug("Error during parse sample\n");
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goto out_delete_evlist;
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}
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total_periods += sample.period;
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nr_samples++;
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next_event:
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perf_evlist__mmap_consume(evlist, 0);
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}
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if ((u64) nr_samples == total_periods) {
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pr_debug("All (%d) samples have period value of 1!\n",
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nr_samples);
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err = -1;
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}
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out_free_maps:
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cpu_map__put(cpus);
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thread_map__put(threads);
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out_delete_evlist:
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perf_evlist__delete(evlist);
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return err;
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}
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int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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int ret;
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ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
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if (!ret)
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ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
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return ret;
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}
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