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// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <limits.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <perf/cpumap.h>
#include <perf/evlist.h>
#include <perf/mmap.h>
#include "debug.h"
#include "parse-events.h"
#include "evlist.h"
#include "evsel.h"
#include "record.h"
#include "thread_map.h"
#include "tests.h"
#include "util/mmap.h"
#define CHECK__(x) { \
while ((x) < 0) { \
pr_debug(#x " failed!\n"); \
goto out_err; \
} \
}
#define CHECK_NOT_NULL__(x) { \
while ((x) == NULL) { \
pr_debug(#x " failed!\n"); \
goto out_err; \
} \
}
static int find_comm(struct evlist *evlist, const char *comm)
{
union perf_event *event;
struct mmap *md;
int i, found;
found = 0;
for (i = 0; i < evlist->core.nr_mmaps; i++) {
md = &evlist->mmap[i];
if (perf_mmap__read_init(&md->core) < 0)
continue;
while ((event = perf_mmap__read_event(&md->core)) != NULL) {
if (event->header.type == PERF_RECORD_COMM &&
(pid_t)event->comm.pid == getpid() &&
(pid_t)event->comm.tid == getpid() &&
strcmp(event->comm.comm, comm) == 0)
found += 1;
perf_mmap__consume(&md->core);
}
perf_mmap__read_done(&md->core);
}
return found;
}
/**
* test__keep_tracking - test using a dummy software event to keep tracking.
*
* This function implements a test that checks that tracking events continue
* when an event is disabled but a dummy software event is not disabled. If the
* test passes %0 is returned, otherwise %-1 is returned.
*/
static int test__keep_tracking(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
{
struct record_opts opts = {
.mmap_pages = UINT_MAX,
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.target = {
.uses_mmap = true,
},
};
struct perf_thread_map *threads = NULL;
struct perf_cpu_map *cpus = NULL;
struct evlist *evlist = NULL;
struct evsel *evsel = NULL;
int found, err = -1;
const char *comm;
threads = thread_map__new(-1, getpid(), UINT_MAX);
CHECK_NOT_NULL__(threads);
cpus = perf_cpu_map__new_online_cpus();
CHECK_NOT_NULL__(cpus);
evlist = evlist__new();
CHECK_NOT_NULL__(evlist);
perf_evlist__set_maps(&evlist->core, cpus, threads);
CHECK__(parse_event(evlist, "dummy:u"));
CHECK__(parse_event(evlist, "cycles:u"));
evlist__config(evlist, &opts, NULL);
evsel = evlist__first(evlist);
evsel->core.attr.comm = 1;
evsel->core.attr.disabled = 1;
evsel->core.attr.enable_on_exec = 0;
if (evlist__open(evlist) < 0) {
pr_debug("Unable to open dummy and cycles event\n");
err = TEST_SKIP;
goto out_err;
}
CHECK__(evlist__mmap(evlist, UINT_MAX));
/*
* First, test that a 'comm' event can be found when the event is
* enabled.
*/
evlist__enable(evlist);
comm = "Test COMM 1";
CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
evlist__disable(evlist);
found = find_comm(evlist, comm);
if (found != 1) {
pr_debug("First time, failed to find tracking event.\n");
goto out_err;
}
/*
* Secondly, test that a 'comm' event can be found when the event is
* disabled with the dummy event still enabled.
*/
evlist__enable(evlist);
evsel = evlist__last(evlist);
CHECK__(evsel__disable(evsel));
comm = "Test COMM 2";
CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
evlist__disable(evlist);
found = find_comm(evlist, comm);
if (found != 1) {
pr_debug("Second time, failed to find tracking event.\n");
goto out_err;
}
err = 0;
out_err:
if (evlist) {
evlist__disable(evlist);
evlist__delete(evlist);
}
perf_cpu_map__put(cpus);
perf_thread_map__put(threads);
return err;
}
DEFINE_SUITE("Use a dummy software event to keep tracking", keep_tracking);
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