#include <linux/types.h> #include <unistd.h> #include <sys/prctl.h> #include "parse-events.h" #include "evlist.h" #include "evsel.h" #include "thread_map.h" #include "cpumap.h" #include "tests.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 perf_evlist *evlist, const char *comm) { union perf_event *event; int i, found; found = 0; for (i = 0; i < evlist->nr_mmaps; i++) { while ((event = perf_evlist__mmap_read(evlist, i)) != 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_evlist__mmap_consume(evlist, i); } } 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(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 thread_map *threads = NULL; struct cpu_map *cpus = NULL; struct perf_evlist *evlist = NULL; struct perf_evsel *evsel = NULL; int found, err = -1; const char *comm; threads = thread_map__new(-1, getpid(), UINT_MAX); CHECK_NOT_NULL__(threads); cpus = cpu_map__new(NULL); CHECK_NOT_NULL__(cpus); evlist = perf_evlist__new(); CHECK_NOT_NULL__(evlist); perf_evlist__set_maps(evlist, cpus, threads); CHECK__(parse_events(evlist, "dummy:u", NULL)); CHECK__(parse_events(evlist, "cycles:u", NULL)); perf_evlist__config(evlist, &opts, NULL); evsel = perf_evlist__first(evlist); evsel->attr.comm = 1; evsel->attr.disabled = 1; evsel->attr.enable_on_exec = 0; if (perf_evlist__open(evlist) < 0) { pr_debug("Unable to open dummy and cycles event\n"); err = TEST_SKIP; goto out_err; } CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false)); /* * First, test that a 'comm' event can be found when the event is * enabled. */ perf_evlist__enable(evlist); comm = "Test COMM 1"; CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); perf_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. */ perf_evlist__enable(evlist); evsel = perf_evlist__last(evlist); CHECK__(perf_evsel__disable(evsel)); comm = "Test COMM 2"; CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); perf_evlist__disable(evlist); found = find_comm(evlist, comm); if (found != 1) { pr_debug("Seconf time, failed to find tracking event.\n"); goto out_err; } err = 0; out_err: if (evlist) { perf_evlist__disable(evlist); perf_evlist__delete(evlist); } else { cpu_map__put(cpus); thread_map__put(threads); } return err; }