// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <unistd.h>
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#include <sys/prctl.h>
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#include "parse-events.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tests.h"
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#define CHECK__(x) { \
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while ((x) < 0) { \
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pr_debug(#x " failed!\n"); \
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goto out_err; \
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} \
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}
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#define CHECK_NOT_NULL__(x) { \
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while ((x) == NULL) { \
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pr_debug(#x " failed!\n"); \
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goto out_err; \
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} \
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}
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static int find_comm(struct perf_evlist *evlist, const char *comm)
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{
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union perf_event *event;
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struct perf_mmap *md;
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int i, found;
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found = 0;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(md) < 0)
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continue;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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if (event->header.type == PERF_RECORD_COMM &&
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(pid_t)event->comm.pid == getpid() &&
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(pid_t)event->comm.tid == getpid() &&
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strcmp(event->comm.comm, comm) == 0)
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found += 1;
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perf_mmap__consume(md);
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}
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perf_mmap__read_done(md);
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}
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return found;
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}
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/**
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* test__keep_tracking - test using a dummy software event to keep tracking.
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*
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* This function implements a test that checks that tracking events continue
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* when an event is disabled but a dummy software event is not disabled. If the
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* test passes %0 is returned, otherwise %-1 is returned.
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*/
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int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct record_opts opts = {
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.mmap_pages = UINT_MAX,
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.user_freq = UINT_MAX,
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.user_interval = ULLONG_MAX,
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.target = {
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.uses_mmap = true,
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},
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};
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struct thread_map *threads = NULL;
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struct cpu_map *cpus = NULL;
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel = NULL;
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int found, err = -1;
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const char *comm;
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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CHECK_NOT_NULL__(threads);
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cpus = cpu_map__new(NULL);
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CHECK_NOT_NULL__(cpus);
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evlist = perf_evlist__new();
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CHECK_NOT_NULL__(evlist);
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perf_evlist__set_maps(evlist, cpus, threads);
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CHECK__(parse_events(evlist, "dummy:u", NULL));
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CHECK__(parse_events(evlist, "cycles:u", NULL));
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perf_evlist__config(evlist, &opts, NULL);
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evsel = perf_evlist__first(evlist);
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evsel->attr.comm = 1;
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evsel->attr.disabled = 1;
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evsel->attr.enable_on_exec = 0;
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if (perf_evlist__open(evlist) < 0) {
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pr_debug("Unable to open dummy and cycles event\n");
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err = TEST_SKIP;
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goto out_err;
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}
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CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
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/*
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* First, test that a 'comm' event can be found when the event is
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* enabled.
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*/
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perf_evlist__enable(evlist);
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comm = "Test COMM 1";
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
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perf_evlist__disable(evlist);
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found = find_comm(evlist, comm);
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if (found != 1) {
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pr_debug("First time, failed to find tracking event.\n");
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goto out_err;
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}
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/*
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* Secondly, test that a 'comm' event can be found when the event is
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* disabled with the dummy event still enabled.
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*/
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perf_evlist__enable(evlist);
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evsel = perf_evlist__last(evlist);
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CHECK__(perf_evsel__disable(evsel));
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comm = "Test COMM 2";
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
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perf_evlist__disable(evlist);
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found = find_comm(evlist, comm);
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if (found != 1) {
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pr_debug("Seconf time, failed to find tracking event.\n");
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goto out_err;
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}
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err = 0;
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out_err:
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if (evlist) {
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perf_evlist__disable(evlist);
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perf_evlist__delete(evlist);
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} else {
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cpu_map__put(cpus);
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thread_map__put(threads);
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}
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return err;
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}
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