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>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
482ad89745
commit
3e7c439a7c
@ -841,6 +841,339 @@ static int test__parse_events(void)
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return ret;
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return ret;
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}
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}
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static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t **maskp,
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size_t *sizep)
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{
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cpu_set_t *mask;
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size_t size;
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int i, cpu = -1, nrcpus = 1024;
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realloc:
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mask = CPU_ALLOC(nrcpus);
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size = CPU_ALLOC_SIZE(nrcpus);
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CPU_ZERO_S(size, mask);
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if (sched_getaffinity(pid, size, mask) == -1) {
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CPU_FREE(mask);
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if (errno == EINVAL && nrcpus < (1024 << 8)) {
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nrcpus = nrcpus << 2;
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goto realloc;
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}
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perror("sched_getaffinity");
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return -1;
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}
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for (i = 0; i < nrcpus; i++) {
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if (CPU_ISSET_S(i, size, mask)) {
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if (cpu == -1) {
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cpu = i;
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*maskp = mask;
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*sizep = size;
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} else
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CPU_CLR_S(i, size, mask);
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}
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}
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if (cpu == -1)
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CPU_FREE(mask);
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return cpu;
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}
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static int test__PERF_RECORD(void)
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{
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struct perf_record_opts opts = {
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.target_pid = -1,
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.target_tid = -1,
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.no_delay = true,
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.freq = 10,
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.mmap_pages = 256,
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.sample_id_all_avail = true,
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};
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cpu_set_t *cpu_mask = NULL;
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size_t cpu_mask_size = 0;
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struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
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struct perf_evsel *evsel;
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struct perf_sample sample;
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const char *cmd = "sleep";
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const char *argv[] = { cmd, "1", NULL, };
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char *bname;
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u64 sample_type, prev_time = 0;
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bool found_cmd_mmap = false,
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found_libc_mmap = false,
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found_vdso_mmap = false,
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found_ld_mmap = false;
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int err = -1, i, wakeups = 0, sample_size;
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u32 cpu;
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int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
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if (evlist == NULL || argv == NULL) {
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pr_debug("Not enough memory to create evlist\n");
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goto out;
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}
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/*
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* We need at least one evsel in the evlist, use the default
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* one: "cycles".
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*/
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err = perf_evlist__add_default(evlist);
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if (err < 0) {
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pr_debug("Not enough memory to create evsel\n");
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goto out_delete_evlist;
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}
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/*
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* Create maps of threads and cpus to monitor. In this case
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* we start with all threads and cpus (-1, -1) but then in
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* perf_evlist__prepare_workload we'll fill in the only thread
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* we're monitoring, the one forked there.
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*/
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err = perf_evlist__create_maps(evlist, opts.target_pid,
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opts.target_tid, opts.cpu_list);
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if (err < 0) {
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_delete_evlist;
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}
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/*
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* Prepare the workload in argv[] to run, it'll fork it, and then wait
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* for perf_evlist__start_workload() to exec it. This is done this way
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* so that we have time to open the evlist (calling sys_perf_event_open
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* on all the fds) and then mmap them.
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*/
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err = perf_evlist__prepare_workload(evlist, &opts, argv);
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if (err < 0) {
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pr_debug("Couldn't run the workload!\n");
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goto out_delete_evlist;
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}
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/*
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* Config the evsels, setting attr->comm on the first one, etc.
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*/
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evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
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evsel->attr.sample_type |= PERF_SAMPLE_CPU;
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evsel->attr.sample_type |= PERF_SAMPLE_TID;
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evsel->attr.sample_type |= PERF_SAMPLE_TIME;
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perf_evlist__config_attrs(evlist, &opts);
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err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask,
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&cpu_mask_size);
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if (err < 0) {
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pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
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goto out_delete_evlist;
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}
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cpu = err;
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/*
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* So that we can check perf_sample.cpu on all the samples.
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*/
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if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, cpu_mask) < 0) {
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pr_debug("sched_setaffinity: %s\n", strerror(errno));
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goto out_free_cpu_mask;
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}
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/*
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* Call sys_perf_event_open on all the fds on all the evsels,
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* grouping them if asked to.
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*/
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err = perf_evlist__open(evlist, opts.group);
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if (err < 0) {
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pr_debug("perf_evlist__open: %s\n", strerror(errno));
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goto out_delete_evlist;
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}
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/*
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* mmap the first fd on a given CPU and ask for events for the other
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* fds in the same CPU to be injected in the same mmap ring buffer
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* (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
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*/
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err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
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if (err < 0) {
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pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
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goto out_delete_evlist;
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}
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/*
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* We'll need these two to parse the PERF_SAMPLE_* fields in each
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* event.
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*/
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sample_type = perf_evlist__sample_type(evlist);
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sample_size = __perf_evsel__sample_size(sample_type);
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/*
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* Now that all is properly set up, enable the events, they will
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* count just on workload.pid, which will start...
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*/
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perf_evlist__enable(evlist);
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/*
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* Now!
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*/
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perf_evlist__start_workload(evlist);
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err = -1;
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while (1) {
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int before = total_events;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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union perf_event *event;
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while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
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const u32 type = event->header.type;
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const char *name = perf_event__name(type);
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++total_events;
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if (type < PERF_RECORD_MAX)
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nr_events[type]++;
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if (perf_event__parse_sample(event, sample_type,
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sample_size, true,
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&sample, false) < 0) {
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if (verbose)
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perf_event__fprintf(event, stderr);
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pr_debug("Couldn't parse sample\n");
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goto out_err;
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}
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if (verbose) {
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pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
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perf_event__fprintf(event, stderr);
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}
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if (prev_time > sample.time) {
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pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
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name, prev_time, sample.time);
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goto out_err;
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}
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prev_time = sample.time;
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if (sample.cpu != cpu) {
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pr_debug("%s with unexpected cpu, expected %d, got %d\n",
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name, cpu, sample.cpu);
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goto out_err;
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}
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if ((pid_t)sample.pid != evlist->workload.pid) {
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pr_debug("%s with unexpected pid, expected %d, got %d\n",
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name, evlist->workload.pid, sample.pid);
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goto out_err;
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}
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if ((pid_t)sample.tid != evlist->workload.pid) {
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pr_debug("%s with unexpected tid, expected %d, got %d\n",
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name, evlist->workload.pid, sample.tid);
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goto out_err;
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}
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if ((type == PERF_RECORD_COMM ||
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type == PERF_RECORD_MMAP ||
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type == PERF_RECORD_FORK ||
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type == PERF_RECORD_EXIT) &&
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(pid_t)event->comm.pid != evlist->workload.pid) {
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pr_debug("%s with unexpected pid/tid\n", name);
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goto out_err;
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}
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if ((type == PERF_RECORD_COMM ||
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type == PERF_RECORD_MMAP) &&
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event->comm.pid != event->comm.tid) {
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pr_debug("%s with different pid/tid!\n", name);
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goto out_err;
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}
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switch (type) {
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case PERF_RECORD_COMM:
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if (strcmp(event->comm.comm, cmd)) {
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pr_debug("%s with unexpected comm!\n", name);
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goto out_err;
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}
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break;
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case PERF_RECORD_EXIT:
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goto found_exit;
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case PERF_RECORD_MMAP:
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bname = strrchr(event->mmap.filename, '/');
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if (bname != NULL) {
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if (!found_cmd_mmap)
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found_cmd_mmap = !strcmp(bname + 1, cmd);
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if (!found_libc_mmap)
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found_libc_mmap = !strncmp(bname + 1, "libc", 4);
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if (!found_ld_mmap)
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found_ld_mmap = !strncmp(bname + 1, "ld", 2);
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} else if (!found_vdso_mmap)
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found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
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break;
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case PERF_RECORD_SAMPLE:
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/* Just ignore samples for now */
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break;
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default:
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pr_debug("Unexpected perf_event->header.type %d!\n",
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type);
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goto out_err;
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}
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}
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}
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/*
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* We don't use poll here because at least at 3.1 times the
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* PERF_RECORD_{!SAMPLE} events don't honour
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* perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
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*/
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if (total_events == before && false)
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poll(evlist->pollfd, evlist->nr_fds, -1);
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sleep(1);
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if (++wakeups > 5) {
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pr_debug("No PERF_RECORD_EXIT event!\n");
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goto out_err;
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}
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}
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found_exit:
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if (nr_events[PERF_RECORD_COMM] > 1) {
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pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
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goto out_err;
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}
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if (nr_events[PERF_RECORD_COMM] == 0) {
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pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
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goto out_err;
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}
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if (!found_cmd_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
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goto out_err;
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}
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if (!found_libc_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
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goto out_err;
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}
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if (!found_ld_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
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goto out_err;
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}
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if (!found_vdso_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
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goto out_err;
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}
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|
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err = 0;
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|
out_err:
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perf_evlist__munmap(evlist);
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out_free_cpu_mask:
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|
CPU_FREE(cpu_mask);
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|
out_delete_evlist:
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|
perf_evlist__delete(evlist);
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|
out:
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return err;
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|
}
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|
||||||
static struct test {
|
static struct test {
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const char *desc;
|
const char *desc;
|
||||||
int (*func)(void);
|
int (*func)(void);
|
||||||
@ -865,6 +1198,10 @@ static struct test {
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.desc = "parse events tests",
|
.desc = "parse events tests",
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.func = test__parse_events,
|
.func = test__parse_events,
|
||||||
},
|
},
|
||||||
|
{
|
||||||
|
.desc = "Validate PERF_RECORD_* events & perf_sample fields",
|
||||||
|
.func = test__PERF_RECORD,
|
||||||
|
},
|
||||||
{
|
{
|
||||||
.func = NULL,
|
.func = NULL,
|
||||||
},
|
},
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user