149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
#include "evlist.h"
|
|
#include "evsel.h"
|
|
#include "thread_map.h"
|
|
#include "cpumap.h"
|
|
#include "tests.h"
|
|
#include <linux/err.h>
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int test__basic_mmap(int subtest __maybe_unused)
|
|
{
|
|
int err = -1;
|
|
union perf_event *event;
|
|
struct thread_map *threads;
|
|
struct cpu_map *cpus;
|
|
struct perf_evlist *evlist;
|
|
cpu_set_t cpu_set;
|
|
const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
|
|
pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
|
|
#define nsyscalls ARRAY_SIZE(syscall_names)
|
|
unsigned int nr_events[nsyscalls],
|
|
expected_nr_events[nsyscalls], i, j;
|
|
struct perf_evsel *evsels[nsyscalls], *evsel;
|
|
char sbuf[STRERR_BUFSIZE];
|
|
|
|
threads = thread_map__new(-1, getpid(), UINT_MAX);
|
|
if (threads == NULL) {
|
|
pr_debug("thread_map__new\n");
|
|
return -1;
|
|
}
|
|
|
|
cpus = cpu_map__new(NULL);
|
|
if (cpus == NULL) {
|
|
pr_debug("cpu_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_r(errno, sbuf, sizeof(sbuf)));
|
|
goto out_free_cpus;
|
|
}
|
|
|
|
evlist = perf_evlist__new();
|
|
if (evlist == NULL) {
|
|
pr_debug("perf_evlist__new\n");
|
|
goto out_free_cpus;
|
|
}
|
|
|
|
perf_evlist__set_maps(evlist, cpus, threads);
|
|
|
|
for (i = 0; i < nsyscalls; ++i) {
|
|
char name[64];
|
|
|
|
snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
|
|
evsels[i] = perf_evsel__newtp("syscalls", name);
|
|
if (IS_ERR(evsels[i])) {
|
|
pr_debug("perf_evsel__new\n");
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
evsels[i]->attr.wakeup_events = 1;
|
|
perf_evsel__set_sample_id(evsels[i], false);
|
|
|
|
perf_evlist__add(evlist, evsels[i]);
|
|
|
|
if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
|
|
pr_debug("failed to open counter: %s, "
|
|
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
|
|
strerror_r(errno, sbuf, sizeof(sbuf)));
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
nr_events[i] = 0;
|
|
expected_nr_events[i] = 1 + rand() % 127;
|
|
}
|
|
|
|
if (perf_evlist__mmap(evlist, 128, true) < 0) {
|
|
pr_debug("failed to mmap events: %d (%s)\n", errno,
|
|
strerror_r(errno, sbuf, sizeof(sbuf)));
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
for (i = 0; i < nsyscalls; ++i)
|
|
for (j = 0; j < expected_nr_events[i]; ++j) {
|
|
int foo = syscalls[i]();
|
|
++foo;
|
|
}
|
|
|
|
while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
|
|
struct perf_sample sample;
|
|
|
|
if (event->header.type != PERF_RECORD_SAMPLE) {
|
|
pr_debug("unexpected %s event\n",
|
|
perf_event__name(event->header.type));
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
err = perf_evlist__parse_sample(evlist, event, &sample);
|
|
if (err) {
|
|
pr_err("Can't parse sample, err = %d\n", err);
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
err = -1;
|
|
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_delete_evlist;
|
|
}
|
|
nr_events[evsel->idx]++;
|
|
perf_evlist__mmap_consume(evlist, 0);
|
|
}
|
|
|
|
err = 0;
|
|
evlist__for_each(evlist, evsel) {
|
|
if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
|
|
pr_debug("expected %d %s events, got %d\n",
|
|
expected_nr_events[evsel->idx],
|
|
perf_evsel__name(evsel), nr_events[evsel->idx]);
|
|
err = -1;
|
|
goto out_delete_evlist;
|
|
}
|
|
}
|
|
|
|
out_delete_evlist:
|
|
perf_evlist__delete(evlist);
|
|
cpus = NULL;
|
|
threads = NULL;
|
|
out_free_cpus:
|
|
cpu_map__put(cpus);
|
|
out_free_threads:
|
|
thread_map__put(threads);
|
|
return err;
|
|
}
|