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    Subject[PATCH 16/29] perf test: Add test for the evlist mmap routines
    Date
    From: Arnaldo Carvalho de Melo <acme@redhat.com>

    This test will generate random numbers of calls to some getpid syscalls,
    then establish an mmap for a group of events that are created to monitor
    these syscalls.

    It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
    sample.id field to map back to its respective perf_evsel instance.

    Then it checks if the number of syscalls reported as perf events by the
    kernel corresponds to the number of syscalls made.

    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    LKML-Reference: <new-submission>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/builtin-test.c | 171 ++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 169 insertions(+), 2 deletions(-)

    diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
    index 5a50e47..4fd3453 100644
    --- a/tools/perf/builtin-test.c
    +++ b/tools/perf/builtin-test.c
    @@ -7,7 +7,9 @@

    #include "util/cache.h"
    #include "util/debug.h"
    +#include "util/evlist.h"
    #include "util/parse-options.h"
    +#include "util/parse-events.h"
    #include "util/session.h"
    #include "util/symbol.h"
    #include "util/thread.h"
    @@ -238,14 +240,14 @@ out:
    #include "util/evsel.h"
    #include <sys/types.h>

    -static int trace_event__id(const char *event_name)
    +static int trace_event__id(const char *evname)
    {
    char *filename;
    int err = -1, fd;

    if (asprintf(&filename,
    "/sys/kernel/debug/tracing/events/syscalls/%s/id",
    - event_name) < 0)
    + evname) < 0)
    return -1;

    fd = open(filename, O_RDONLY);
    @@ -439,6 +441,167 @@ out_thread_map_delete:
    return err;
    }

    +/*
    + * This test will generate random numbers of calls to some getpid syscalls,
    + * then establish an mmap for a group of events that are created to monitor
    + * the syscalls.
    + *
    + * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
    + * sample.id field to map back to its respective perf_evsel instance.
    + *
    + * Then it checks if the number of syscalls reported as perf events by
    + * the kernel corresponds to the number of syscalls made.
    + */
    +static int test__basic_mmap(void)
    +{
    + int err = -1;
    + event_t *event;
    + struct thread_map *threads;
    + struct perf_session session;
    + struct cpu_map *cpus;
    + struct perf_evlist *evlist;
    + struct perf_event_attr attr = {
    + .type = PERF_TYPE_TRACEPOINT,
    + .read_format = PERF_FORMAT_ID,
    + .sample_type = PERF_SAMPLE_ID,
    + .watermark = 0,
    + };
    + cpu_set_t cpu_set;
    + const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
    + "getpgid", };
    + pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
    + (void*)getpgid };
    +#define nsyscalls ARRAY_SIZE(syscall_names)
    + int ids[nsyscalls];
    + unsigned int nr_events[nsyscalls],
    + expected_nr_events[nsyscalls], i, j;
    + struct perf_evsel *evsels[nsyscalls], *evsel;
    +
    + for (i = 0; i < nsyscalls; ++i) {
    + char name[64];
    +
    + snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
    + ids[i] = trace_event__id(name);
    + if (ids[i] < 0) {
    + pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
    + return -1;
    + }
    + nr_events[i] = 0;
    + expected_nr_events[i] = random() % 257;
    + }
    +
    + threads = thread_map__new(-1, getpid());
    + if (threads == NULL) {
    + pr_debug("thread_map__new\n");
    + return -1;
    + }
    +
    + cpus = cpu_map__new(NULL);
    + if (threads == NULL) {
    + pr_debug("thread_map__new\n");
    + goto out_free_threads;
    + }
    +
    + CPU_ZERO(&cpu_set);
    + CPU_SET(cpus->map[0], &cpu_set);
    + sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
    + if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
    + pr_debug("sched_setaffinity() failed on CPU %d: %s ",
    + cpus->map[0], strerror(errno));
    + goto out_free_cpus;
    + }
    +
    + evlist = perf_evlist__new();
    + if (threads == NULL) {
    + pr_debug("perf_evlist__new\n");
    + goto out_free_cpus;
    + }
    +
    + /* anonymous union fields, can't be initialized above */
    + attr.wakeup_events = 1;
    + attr.sample_period = 1;
    +
    + /*
    + * FIXME: use evsel->attr.sample_type in event__parse_sample.
    + * This will nicely remove the requirement that we have
    + * all the events with the same sample_type.
    + */
    + session.sample_type = attr.sample_type;
    +
    + for (i = 0; i < nsyscalls; ++i) {
    + attr.config = ids[i];
    + evsels[i] = perf_evsel__new(&attr, i);
    + if (evsels[i] == NULL) {
    + pr_debug("perf_evsel__new\n");
    + goto out_free_evlist;
    + }
    +
    + perf_evlist__add(evlist, evsels[i]);
    +
    + if (perf_evsel__open(evsels[i], cpus, threads, false, false) < 0) {
    + pr_debug("failed to open counter: %s, "
    + "tweak /proc/sys/kernel/perf_event_paranoid?\n",
    + strerror(errno));
    + goto out_close_fd;
    + }
    + }
    +
    + if (perf_evlist__mmap(evlist, cpus, threads, 128, true) < 0) {
    + pr_debug("failed to mmap events: %d (%s)\n", errno,
    + strerror(errno));
    + goto out_close_fd;
    + }
    +
    + for (i = 0; i < nsyscalls; ++i)
    + for (j = 0; j < expected_nr_events[i]; ++j) {
    + int foo = syscalls[i]();
    + ++foo;
    + }
    +
    + while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
    + struct sample_data sample;
    +
    + if (event->header.type != PERF_RECORD_SAMPLE) {
    + pr_debug("unexpected %s event\n",
    + event__get_event_name(event->header.type));
    + goto out_munmap;
    + }
    +
    + event__parse_sample(event, &session, &sample);
    + evsel = perf_evlist__id2evsel(evlist, sample.id);
    + if (evsel == NULL) {
    + pr_debug("event with id %" PRIu64
    + " doesn't map to an evsel\n", sample.id);
    + goto out_munmap;
    + }
    + nr_events[evsel->idx]++;
    + }
    +
    + list_for_each_entry(evsel, &evlist->entries, node) {
    + if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
    + pr_debug("expected %d %s events, got %d\n",
    + expected_nr_events[evsel->idx],
    + event_name(evsel), nr_events[evsel->idx]);
    + goto out_munmap;
    + }
    + }
    +
    + err = 0;
    +out_munmap:
    + perf_evlist__munmap(evlist, 1);
    +out_close_fd:
    + for (i = 0; i < nsyscalls; ++i)
    + perf_evsel__close_fd(evsels[i], 1, threads->nr);
    +out_free_evlist:
    + perf_evlist__delete(evlist);
    +out_free_cpus:
    + cpu_map__delete(cpus);
    +out_free_threads:
    + thread_map__delete(threads);
    + return err;
    +#undef nsyscalls
    +}
    +
    static struct test {
    const char *desc;
    int (*func)(void);
    @@ -456,6 +619,10 @@ static struct test {
    .func = test__open_syscall_event_on_all_cpus,
    },
    {
    + .desc = "read samples using the mmap interface",
    + .func = test__basic_mmap,
    + },
    + {
    .func = NULL,
    },
    };
    --
    1.6.2.5


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