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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.
- */
- int test__keep_tracking(struct test *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(NULL);
- CHECK_NOT_NULL__(cpus);
- evlist = evlist__new();
- CHECK_NOT_NULL__(evlist);
- perf_evlist__set_maps(&evlist->core, cpus, threads);
- CHECK__(parse_events(evlist, "dummy:u", NULL));
- CHECK__(parse_events(evlist, "cycles:u", NULL));
- perf_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);
- } else {
- perf_cpu_map__put(cpus);
- perf_thread_map__put(threads);
- }
- return err;
- }
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