1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <unistd.h> 4 #include <sys/prctl.h> 5 6 #include "parse-events.h" 7 #include "evlist.h" 8 #include "evsel.h" 9 #include "thread_map.h" 10 #include "cpumap.h" 11 #include "tests.h" 12 13 #define CHECK__(x) { \ 14 while ((x) < 0) { \ 15 pr_debug(#x " failed!\n"); \ 16 goto out_err; \ 17 } \ 18 } 19 20 #define CHECK_NOT_NULL__(x) { \ 21 while ((x) == NULL) { \ 22 pr_debug(#x " failed!\n"); \ 23 goto out_err; \ 24 } \ 25 } 26 27 static int find_comm(struct perf_evlist *evlist, const char *comm) 28 { 29 union perf_event *event; 30 struct perf_mmap *md; 31 int i, found; 32 33 found = 0; 34 for (i = 0; i < evlist->nr_mmaps; i++) { 35 md = &evlist->mmap[i]; 36 if (perf_mmap__read_init(md) < 0) 37 continue; 38 while ((event = perf_mmap__read_event(md)) != NULL) { 39 if (event->header.type == PERF_RECORD_COMM && 40 (pid_t)event->comm.pid == getpid() && 41 (pid_t)event->comm.tid == getpid() && 42 strcmp(event->comm.comm, comm) == 0) 43 found += 1; 44 perf_mmap__consume(md); 45 } 46 perf_mmap__read_done(md); 47 } 48 return found; 49 } 50 51 /** 52 * test__keep_tracking - test using a dummy software event to keep tracking. 53 * 54 * This function implements a test that checks that tracking events continue 55 * when an event is disabled but a dummy software event is not disabled. If the 56 * test passes %0 is returned, otherwise %-1 is returned. 57 */ 58 int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused) 59 { 60 struct record_opts opts = { 61 .mmap_pages = UINT_MAX, 62 .user_freq = UINT_MAX, 63 .user_interval = ULLONG_MAX, 64 .target = { 65 .uses_mmap = true, 66 }, 67 }; 68 struct thread_map *threads = NULL; 69 struct cpu_map *cpus = NULL; 70 struct perf_evlist *evlist = NULL; 71 struct perf_evsel *evsel = NULL; 72 int found, err = -1; 73 const char *comm; 74 75 threads = thread_map__new(-1, getpid(), UINT_MAX); 76 CHECK_NOT_NULL__(threads); 77 78 cpus = cpu_map__new(NULL); 79 CHECK_NOT_NULL__(cpus); 80 81 evlist = perf_evlist__new(); 82 CHECK_NOT_NULL__(evlist); 83 84 perf_evlist__set_maps(evlist, cpus, threads); 85 86 CHECK__(parse_events(evlist, "dummy:u", NULL)); 87 CHECK__(parse_events(evlist, "cycles:u", NULL)); 88 89 perf_evlist__config(evlist, &opts, NULL); 90 91 evsel = perf_evlist__first(evlist); 92 93 evsel->attr.comm = 1; 94 evsel->attr.disabled = 1; 95 evsel->attr.enable_on_exec = 0; 96 97 if (perf_evlist__open(evlist) < 0) { 98 pr_debug("Unable to open dummy and cycles event\n"); 99 err = TEST_SKIP; 100 goto out_err; 101 } 102 103 CHECK__(perf_evlist__mmap(evlist, UINT_MAX)); 104 105 /* 106 * First, test that a 'comm' event can be found when the event is 107 * enabled. 108 */ 109 110 perf_evlist__enable(evlist); 111 112 comm = "Test COMM 1"; 113 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 114 115 perf_evlist__disable(evlist); 116 117 found = find_comm(evlist, comm); 118 if (found != 1) { 119 pr_debug("First time, failed to find tracking event.\n"); 120 goto out_err; 121 } 122 123 /* 124 * Secondly, test that a 'comm' event can be found when the event is 125 * disabled with the dummy event still enabled. 126 */ 127 128 perf_evlist__enable(evlist); 129 130 evsel = perf_evlist__last(evlist); 131 132 CHECK__(perf_evsel__disable(evsel)); 133 134 comm = "Test COMM 2"; 135 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 136 137 perf_evlist__disable(evlist); 138 139 found = find_comm(evlist, comm); 140 if (found != 1) { 141 pr_debug("Seconf time, failed to find tracking event.\n"); 142 goto out_err; 143 } 144 145 err = 0; 146 147 out_err: 148 if (evlist) { 149 perf_evlist__disable(evlist); 150 perf_evlist__delete(evlist); 151 } else { 152 cpu_map__put(cpus); 153 thread_map__put(threads); 154 } 155 156 return err; 157 } 158