perf test: Validate PERF_RECORD_ events and perf_sample fields

This new test will validate these new routines extracted from 'perf
record':

 - perf_evlist__config_attrs
 - perf_evlist__prepare_workload
 - perf_evlist__start_workload

In addition to several other perf_evlist methods.

It consists of starting a simple workload, setting up just one event to
monitor ("cycles") requesting that several PERF_SAMPLE_ fields be
present in all events.

It then will check that the expected PERF_RECORD_ events are produced
and will sanity check all its fields.

Some checks performed:

. PERF_SAMPLE_TIME monotonically increases.

. PERF_SAMPLE_CPU is the one requested with sched_setaffinity

. PERF_SAMPLE_TID and PERF_SAMPLE_PID matches the one we forked
  in perf_evlist__prepare_workload and that is stored in
  evlist->workload.pid

. For the events where these fields are also present in its
  pre-sample_id_all fields (e.g. event->mmap.pid), that they are what
  is expected too.

. That we get a bunch of mmaps:

  PATH/libcSUFFIX
  PATH/ldSUFFIX
  [vdso]
  PATH/sleep

Example:

  [root@emilia ~]# taskset -c 3,4 perf test -v1 perf_sample
   6: Validate PERF_RECORD_* events & perf_sample fields:
  --- start ---
  7159480799825 3 PERF_RECORD_SAMPLE
  7159480805584 3 PERF_RECORD_SAMPLE
  7159480807814 3 PERF_RECORD_SAMPLE
  7159480810430 3 PERF_RECORD_SAMPLE
  7159480861511 3 PERF_RECORD_MMAP 8086/8086: [0x7fffffffd000(0x2000) @ 0x7fffffffd000]: //anon
  7159481052516 3 PERF_RECORD_COMM: sleep:8086
  7159481070188 3 PERF_RECORD_MMAP 8086/8086: [0x400000(0x6000) @ 0]: /bin/sleep
  7159481077104 3 PERF_RECORD_MMAP 8086/8086: [0x3d06400000(0x221000) @ 0]: /lib64/ld-2.12.so
  7159481092912 3 PERF_RECORD_MMAP 8086/8086: [0x7fff1adff000(0x1000) @ 0x7fff1adff000]: [vdso]
  7159481196779 3 PERF_RECORD_MMAP 8086/8086: [0x3d06800000(0x37f000) @ 0]: /lib64/libc-2.12.so
  7160481558435 3 PERF_RECORD_EXIT(8086:8086):(8086:8086)
  ---- end ----
  Validate PERF_RECORD_* events & perf_sample fields: Ok
  [root@emilia ~]#

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-svag18v2z4idas0dyz3umjpq@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 337 insertions, 0 deletions

diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 3ab27223fc6..f1e36110b10 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -841,6 +841,339 @@ static int test__parse_events(void)
 
         return ret;
 }
+
+static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t **maskp,
+                                         size_t *sizep)
+{
+        cpu_set_t *mask;
+        size_t size;
+        int i, cpu = -1, nrcpus = 1024;
+realloc:
+        mask = CPU_ALLOC(nrcpus);
+        size = CPU_ALLOC_SIZE(nrcpus);
+        CPU_ZERO_S(size, mask);
+
+        if (sched_getaffinity(pid, size, mask) == -1) {
+                CPU_FREE(mask);
+                if (errno == EINVAL && nrcpus < (1024 << 8)) {
+                        nrcpus = nrcpus << 2;
+                        goto realloc;
+                }
+                perror("sched_getaffinity");
+                        return -1;
+        }
+
+        for (i = 0; i < nrcpus; i++) {
+                if (CPU_ISSET_S(i, size, mask)) {
+                        if (cpu == -1) {
+                                cpu = i;
+                                *maskp = mask;
+                                *sizep = size;
+                        } else
+                                CPU_CLR_S(i, size, mask);
+                }
+        }
+
+        if (cpu == -1)
+                CPU_FREE(mask);
+
+        return cpu;
+}
+
+static int test__PERF_RECORD(void)
+{
+        struct perf_record_opts opts = {
+                .target_pid = -1,
+                .target_tid = -1,
+                .no_delay   = true,
+                .freq       = 10,
+                .mmap_pages = 256,
+                .sample_id_all_avail = true,
+        };
+        cpu_set_t *cpu_mask = NULL;
+        size_t cpu_mask_size = 0;
+        struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
+        struct perf_evsel *evsel;
+        struct perf_sample sample;
+        const char *cmd = "sleep";
+        const char *argv[] = { cmd, "1", NULL, };
+        char *bname;
+        u64 sample_type, prev_time = 0;
+        bool found_cmd_mmap = false,
+             found_libc_mmap = false,
+             found_vdso_mmap = false,
+             found_ld_mmap = false;
+        int err = -1, i, wakeups = 0, sample_size;
+        u32 cpu;
+        int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
+
+        if (evlist == NULL || argv == NULL) {
+                pr_debug("Not enough memory to create evlist\n");
+                goto out;
+        }
+
+        /*
+         * We need at least one evsel in the evlist, use the default
+         * one: "cycles".
+         */
+        err = perf_evlist__add_default(evlist);
+        if (err < 0) {
+                pr_debug("Not enough memory to create evsel\n");
+                goto out_delete_evlist;
+        }
+
+        /*
+         * Create maps of threads and cpus to monitor. In this case
+         * we start with all threads and cpus (-1, -1) but then in
+         * perf_evlist__prepare_workload we'll fill in the only thread
+         * we're monitoring, the one forked there.
+         */
+        err = perf_evlist__create_maps(evlist, opts.target_pid,
+                                       opts.target_tid, opts.cpu_list);
+        if (err < 0) {
+                pr_debug("Not enough memory to create thread/cpu maps\n");
+                goto out_delete_evlist;
+        }
+
+        /*
+         * Prepare the workload in argv[] to run, it'll fork it, and then wait
+         * for perf_evlist__start_workload() to exec it. This is done this way
+         * so that we have time to open the evlist (calling sys_perf_event_open
+         * on all the fds) and then mmap them.
+         */
+        err = perf_evlist__prepare_workload(evlist, &opts, argv);
+        if (err < 0) {
+                pr_debug("Couldn't run the workload!\n");
+                goto out_delete_evlist;
+        }
+
+        /*
+         * Config the evsels, setting attr->comm on the first one, etc.
+         */
+        evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
+        evsel->attr.sample_type |= PERF_SAMPLE_CPU;
+        evsel->attr.sample_type |= PERF_SAMPLE_TID;
+        evsel->attr.sample_type |= PERF_SAMPLE_TIME;
+        perf_evlist__config_attrs(evlist, &opts);
+
+        err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask,
+                                            &cpu_mask_size);
+        if (err < 0) {
+                pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
+                goto out_delete_evlist;
+        }
+
+        cpu = err;
+
+        /*
+         * So that we can check perf_sample.cpu on all the samples.
+         */
+        if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, cpu_mask) < 0) {
+                pr_debug("sched_setaffinity: %s\n", strerror(errno));
+                goto out_free_cpu_mask;
+        }
+
+        /*
+         * Call sys_perf_event_open on all the fds on all the evsels,
+         * grouping them if asked to.
+         */
+        err = perf_evlist__open(evlist, opts.group);
+        if (err < 0) {
+                pr_debug("perf_evlist__open: %s\n", strerror(errno));
+                goto out_delete_evlist;
+        }
+
+        /*
+         * mmap the first fd on a given CPU and ask for events for the other
+         * fds in the same CPU to be injected in the same mmap ring buffer
+         * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
+         */
+        err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
+        if (err < 0) {
+                pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
+                goto out_delete_evlist;
+        }
+
+        /*
+         * We'll need these two to parse the PERF_SAMPLE_* fields in each
+         * event.
+         */
+        sample_type = perf_evlist__sample_type(evlist);
+        sample_size = __perf_evsel__sample_size(sample_type);
+
+        /*
+         * Now that all is properly set up, enable the events, they will
+         * count just on workload.pid, which will start...
+         */
+        perf_evlist__enable(evlist);
+
+        /*
+         * Now!
+         */
+        perf_evlist__start_workload(evlist);
+
+        err = -1;
+
+        while (1) {
+                int before = total_events;
+
+                for (i = 0; i < evlist->nr_mmaps; i++) {
+                        union perf_event *event;
+
+                        while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
+                                const u32 type = event->header.type;
+                                const char *name = perf_event__name(type);
+
+                                ++total_events;
+                                if (type < PERF_RECORD_MAX)
+                                        nr_events[type]++;
+
+                                if (perf_event__parse_sample(event, sample_type,
+                                                             sample_size, true,
+                                                             &sample, false) < 0) {
+                                        if (verbose)
+                                                perf_event__fprintf(event, stderr);
+                                        pr_debug("Couldn't parse sample\n");
+                                        goto out_err;
+                                }
+
+                                if (verbose) {
+                                        pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
+                                        perf_event__fprintf(event, stderr);
+                                }
+
+                                if (prev_time > sample.time) {
+                                        pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
+                                                 name, prev_time, sample.time);
+                                        goto out_err;
+                                }
+
+                                prev_time = sample.time;
+
+                                if (sample.cpu != cpu) {
+                                        pr_debug("%s with unexpected cpu, expected %d, got %d\n",
+                                                 name, cpu, sample.cpu);
+                                        goto out_err;
+                                }
+
+                                if ((pid_t)sample.pid != evlist->workload.pid) {
+                                        pr_debug("%s with unexpected pid, expected %d, got %d\n",
+                                                 name, evlist->workload.pid, sample.pid);
+                                        goto out_err;
+                                }
+
+                                if ((pid_t)sample.tid != evlist->workload.pid) {
+                                        pr_debug("%s with unexpected tid, expected %d, got %d\n",
+                                                 name, evlist->workload.pid, sample.tid);
+                                        goto out_err;
+                                }
+
+                                if ((type == PERF_RECORD_COMM ||
+                                     type == PERF_RECORD_MMAP ||
+                                     type == PERF_RECORD_FORK ||
+                                     type == PERF_RECORD_EXIT) &&
+                                     (pid_t)event->comm.pid != evlist->workload.pid) {
+                                        pr_debug("%s with unexpected pid/tid\n", name);
+                                        goto out_err;
+                                }
+
+                                if ((type == PERF_RECORD_COMM ||
+                                     type == PERF_RECORD_MMAP) &&
+                                     event->comm.pid != event->comm.tid) {
+                                        pr_debug("%s with different pid/tid!\n", name);
+                                        goto out_err;
+                                }
+
+                                switch (type) {
+                                case PERF_RECORD_COMM:
+                                        if (strcmp(event->comm.comm, cmd)) {
+                                                pr_debug("%s with unexpected comm!\n", name);
+                                                goto out_err;
+                                        }
+                                        break;
+                                case PERF_RECORD_EXIT:
+                                        goto found_exit;
+                                case PERF_RECORD_MMAP:
+                                        bname = strrchr(event->mmap.filename, '/');
+                                        if (bname != NULL) {
+                                                if (!found_cmd_mmap)
+                                                        found_cmd_mmap = !strcmp(bname + 1, cmd);
+                                                if (!found_libc_mmap)
+                                                        found_libc_mmap = !strncmp(bname + 1, "libc", 4);
+                                                if (!found_ld_mmap)
+                                                        found_ld_mmap = !strncmp(bname + 1, "ld", 2);
+                                        } else if (!found_vdso_mmap)
+                                                found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
+                                        break;
+
+                                case PERF_RECORD_SAMPLE:
+                                        /* Just ignore samples for now */
+                                        break;
+                                default:
+                                        pr_debug("Unexpected perf_event->header.type %d!\n",
+                                                 type);
+                                        goto out_err;
+                                }
+                        }
+                }
+
+                /*
+                 * We don't use poll here because at least at 3.1 times the
+                 * PERF_RECORD_{!SAMPLE} events don't honour
+                 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
+                 */
+                if (total_events == before && false)
+                        poll(evlist->pollfd, evlist->nr_fds, -1);
+
+                sleep(1);
+                if (++wakeups > 5) {
+                        pr_debug("No PERF_RECORD_EXIT event!\n");
+                        goto out_err;
+                }
+        }
+
+found_exit:
+        if (nr_events[PERF_RECORD_COMM] > 1) {
+                pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
+                goto out_err;
+        }
+
+        if (nr_events[PERF_RECORD_COMM] == 0) {
+                pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
+                goto out_err;
+        }
+
+        if (!found_cmd_mmap) {
+                pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
+                goto out_err;
+        }
+
+        if (!found_libc_mmap) {
+                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
+                goto out_err;
+        }
+
+        if (!found_ld_mmap) {
+                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
+                goto out_err;
+        }
+
+        if (!found_vdso_mmap) {
+                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
+                goto out_err;
+        }
+
+        err = 0;
+out_err:
+        perf_evlist__munmap(evlist);
+out_free_cpu_mask:
+        CPU_FREE(cpu_mask);
+out_delete_evlist:
+        perf_evlist__delete(evlist);
+out:
+        return err;
+}
+
 static struct test {
         const char *desc;
         int (*func)(void);
@@ -866,6 +1199,10 @@ static struct test {
                 .func = test__parse_events,
         },
         {
+                .desc = "Validate PERF_RECORD_* events & perf_sample fields",
+                .func = test__PERF_RECORD,
+        },
+        {
                 .func = NULL,
         },
 };