3fe2130523
Doesn't work for me:
./perf test -v 19
19: Test software clock events have valid period values :
--- start ---
mmap size 528384B
mmap size 528384B
All (0) samples have period value of 1!
---- end ----
Test software clock events have valid period values: FAILED!
Compensate the lower freq introduced in 67c1e4a53b with a longer loop,
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/5281D3B8.2030104@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
#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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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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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_free_evlist;
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}
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perf_evlist__add(evlist, evsel);
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evlist->cpus = cpu_map__dummy_new();
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evlist->threads = thread_map__new_by_tid(getpid());
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if (!evlist->cpus || !evlist->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_delete_maps;
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}
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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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strerror(errno), knob, (u64)attr.sample_freq);
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goto out_delete_maps;
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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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strerror(errno));
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goto out_close_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_unmap_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_unmap_evlist:
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perf_evlist__munmap(evlist);
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out_close_evlist:
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perf_evlist__close(evlist);
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out_delete_maps:
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perf_evlist__delete_maps(evlist);
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out_free_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(void)
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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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