1 #include <linux/types.h> 2 #include <unistd.h> 3 #include <sys/prctl.h> 4 5 #include "parse-events.h" 6 #include "evlist.h" 7 #include "evsel.h" 8 #include "thread_map.h" 9 #include "cpumap.h" 10 #include "tests.h" 11 12 #define CHECK__(x) { \ 13 while ((x) < 0) { \ 14 pr_debug(#x " failed!\n"); \ 15 goto out_err; \ 16 } \ 17 } 18 19 #define CHECK_NOT_NULL__(x) { \ 20 while ((x) == NULL) { \ 21 pr_debug(#x " failed!\n"); \ 22 goto out_err; \ 23 } \ 24 } 25 26 static int find_comm(struct perf_evlist *evlist, const char *comm) 27 { 28 union perf_event *event; 29 int i, found; 30 31 found = 0; 32 for (i = 0; i < evlist->nr_mmaps; i++) { 33 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 34 if (event->header.type == PERF_RECORD_COMM && 35 (pid_t)event->comm.pid == getpid() && 36 (pid_t)event->comm.tid == getpid() && 37 strcmp(event->comm.comm, comm) == 0) 38 found += 1; 39 perf_evlist__mmap_consume(evlist, i); 40 } 41 } 42 return found; 43 } 44 45 /** 46 * test__keep_tracking - test using a dummy software event to keep tracking. 47 * 48 * This function implements a test that checks that tracking events continue 49 * when an event is disabled but a dummy software event is not disabled. If the 50 * test passes %0 is returned, otherwise %-1 is returned. 51 */ 52 int test__keep_tracking(int subtest __maybe_unused) 53 { 54 struct record_opts opts = { 55 .mmap_pages = UINT_MAX, 56 .user_freq = UINT_MAX, 57 .user_interval = ULLONG_MAX, 58 .target = { 59 .uses_mmap = true, 60 }, 61 }; 62 struct thread_map *threads = NULL; 63 struct cpu_map *cpus = NULL; 64 struct perf_evlist *evlist = NULL; 65 struct perf_evsel *evsel = NULL; 66 int found, err = -1; 67 const char *comm; 68 69 threads = thread_map__new(-1, getpid(), UINT_MAX); 70 CHECK_NOT_NULL__(threads); 71 72 cpus = cpu_map__new(NULL); 73 CHECK_NOT_NULL__(cpus); 74 75 evlist = perf_evlist__new(); 76 CHECK_NOT_NULL__(evlist); 77 78 perf_evlist__set_maps(evlist, cpus, threads); 79 80 CHECK__(parse_events(evlist, "dummy:u", NULL)); 81 CHECK__(parse_events(evlist, "cycles:u", NULL)); 82 83 perf_evlist__config(evlist, &opts); 84 85 evsel = perf_evlist__first(evlist); 86 87 evsel->attr.comm = 1; 88 evsel->attr.disabled = 1; 89 evsel->attr.enable_on_exec = 0; 90 91 if (perf_evlist__open(evlist) < 0) { 92 pr_debug("Unable to open dummy and cycles event\n"); 93 err = TEST_SKIP; 94 goto out_err; 95 } 96 97 CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false)); 98 99 /* 100 * First, test that a 'comm' event can be found when the event is 101 * enabled. 102 */ 103 104 perf_evlist__enable(evlist); 105 106 comm = "Test COMM 1"; 107 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 108 109 perf_evlist__disable(evlist); 110 111 found = find_comm(evlist, comm); 112 if (found != 1) { 113 pr_debug("First time, failed to find tracking event.\n"); 114 goto out_err; 115 } 116 117 /* 118 * Secondly, test that a 'comm' event can be found when the event is 119 * disabled with the dummy event still enabled. 120 */ 121 122 perf_evlist__enable(evlist); 123 124 evsel = perf_evlist__last(evlist); 125 126 CHECK__(perf_evsel__disable(evsel)); 127 128 comm = "Test COMM 2"; 129 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 130 131 perf_evlist__disable(evlist); 132 133 found = find_comm(evlist, comm); 134 if (found != 1) { 135 pr_debug("Seconf time, failed to find tracking event.\n"); 136 goto out_err; 137 } 138 139 err = 0; 140 141 out_err: 142 if (evlist) { 143 perf_evlist__disable(evlist); 144 perf_evlist__delete(evlist); 145 } else { 146 cpu_map__put(cpus); 147 thread_map__put(threads); 148 } 149 150 return err; 151 } 152