#include #include #include #include #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; char sbuf[STRERR_BUFSIZE]; 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, }; struct cpu_map *cpus; struct thread_map *threads; 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); cpus = cpu_map__dummy_new(); threads = thread_map__new_by_tid(getpid()); if (!cpus || !threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_free_maps; } perf_evlist__set_maps(evlist, cpus, threads); cpus = NULL; threads = NULL; 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", str_error_r(errno, sbuf, sizeof(sbuf)), 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, str_error_r(errno, sbuf, sizeof(sbuf))); 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_free_maps: cpu_map__put(cpus); thread_map__put(threads); out_delete_evlist: perf_evlist__delete(evlist); return err; } int test__sw_clock_freq(int subtest __maybe_unused) { 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; } >context:space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-25 14:30:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-25 14:30:04 -0800
commit3ddc76dfc786cc6f87852693227fb0b1f124f807 (patch)
tree8192b4721e05cf6823087f9696db8c0c8f144b02
parentb272f732f888d4cf43c943a40c9aaa836f9b7431 (diff)
parent1f3a8e49d8f28f498b8694464623ac20aebfe62a (diff)
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer type cleanups from Thomas Gleixner: "This series does a tree wide cleanup of types related to timers/timekeeping. - Get rid of cycles_t and use a plain u64. The type is not really helpful and caused more confusion than clarity - Get rid of the ktime union. The union has become useless as we use the scalar nanoseconds storage unconditionally now. The 32bit timespec alike storage got removed due to the Y2038 limitations some time ago. That leaves the odd union access around for no reason. Clean it up. Both changes have been done with coccinelle and a small amount of manual mopping up" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ktime: Get rid of ktime_equal() ktime: Cleanup ktime_set() usage ktime: Get rid of the union clocksource: Use a plain u64 instead of cycle_t
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