mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
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:
parent
482ad89745
commit
3e7c439a7c
1 changed files with 337 additions and 0 deletions
|
@ -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);
|
||||
|
@ -865,6 +1198,10 @@ static struct test {
|
|||
.desc = "parse events tests",
|
||||
.func = test__parse_events,
|
||||
},
|
||||
{
|
||||
.desc = "Validate PERF_RECORD_* events & perf_sample fields",
|
||||
.func = test__PERF_RECORD,
|
||||
},
|
||||
{
|
||||
.func = NULL,
|
||||
},
|
||||
|
|
Loading…
Reference in a new issue