1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <unistd.h> 4 #include <sys/prctl.h> 5 #include <perf/cpumap.h> 6 #include <perf/evlist.h> 7 8 #include "parse-events.h" 9 #include "evlist.h" 10 #include "evsel.h" 11 #include "thread_map.h" 12 #include "cpumap.h" 13 #include "tests.h" 14 15 #define CHECK__(x) { \ 16 while ((x) < 0) { \ 17 pr_debug(#x " failed!\n"); \ 18 goto out_err; \ 19 } \ 20 } 21 22 #define CHECK_NOT_NULL__(x) { \ 23 while ((x) == NULL) { \ 24 pr_debug(#x " failed!\n"); \ 25 goto out_err; \ 26 } \ 27 } 28 29 static int find_comm(struct evlist *evlist, const char *comm) 30 { 31 union perf_event *event; 32 struct perf_mmap *md; 33 int i, found; 34 35 found = 0; 36 for (i = 0; i < evlist->nr_mmaps; i++) { 37 md = &evlist->mmap[i]; 38 if (perf_mmap__read_init(md) < 0) 39 continue; 40 while ((event = perf_mmap__read_event(md)) != NULL) { 41 if (event->header.type == PERF_RECORD_COMM && 42 (pid_t)event->comm.pid == getpid() && 43 (pid_t)event->comm.tid == getpid() && 44 strcmp(event->comm.comm, comm) == 0) 45 found += 1; 46 perf_mmap__consume(md); 47 } 48 perf_mmap__read_done(md); 49 } 50 return found; 51 } 52 53 /** 54 * test__keep_tracking - test using a dummy software event to keep tracking. 55 * 56 * This function implements a test that checks that tracking events continue 57 * when an event is disabled but a dummy software event is not disabled. If the 58 * test passes %0 is returned, otherwise %-1 is returned. 59 */ 60 int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused) 61 { 62 struct record_opts opts = { 63 .mmap_pages = UINT_MAX, 64 .user_freq = UINT_MAX, 65 .user_interval = ULLONG_MAX, 66 .target = { 67 .uses_mmap = true, 68 }, 69 }; 70 struct perf_thread_map *threads = NULL; 71 struct perf_cpu_map *cpus = NULL; 72 struct evlist *evlist = NULL; 73 struct evsel *evsel = NULL; 74 int found, err = -1; 75 const char *comm; 76 77 threads = thread_map__new(-1, getpid(), UINT_MAX); 78 CHECK_NOT_NULL__(threads); 79 80 cpus = perf_cpu_map__new(NULL); 81 CHECK_NOT_NULL__(cpus); 82 83 evlist = evlist__new(); 84 CHECK_NOT_NULL__(evlist); 85 86 perf_evlist__set_maps(&evlist->core, cpus, threads); 87 88 CHECK__(parse_events(evlist, "dummy:u", NULL)); 89 CHECK__(parse_events(evlist, "cycles:u", NULL)); 90 91 perf_evlist__config(evlist, &opts, NULL); 92 93 evsel = perf_evlist__first(evlist); 94 95 evsel->core.attr.comm = 1; 96 evsel->core.attr.disabled = 1; 97 evsel->core.attr.enable_on_exec = 0; 98 99 if (evlist__open(evlist) < 0) { 100 pr_debug("Unable to open dummy and cycles event\n"); 101 err = TEST_SKIP; 102 goto out_err; 103 } 104 105 CHECK__(perf_evlist__mmap(evlist, UINT_MAX)); 106 107 /* 108 * First, test that a 'comm' event can be found when the event is 109 * enabled. 110 */ 111 112 evlist__enable(evlist); 113 114 comm = "Test COMM 1"; 115 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 116 117 evlist__disable(evlist); 118 119 found = find_comm(evlist, comm); 120 if (found != 1) { 121 pr_debug("First time, failed to find tracking event.\n"); 122 goto out_err; 123 } 124 125 /* 126 * Secondly, test that a 'comm' event can be found when the event is 127 * disabled with the dummy event still enabled. 128 */ 129 130 evlist__enable(evlist); 131 132 evsel = perf_evlist__last(evlist); 133 134 CHECK__(evsel__disable(evsel)); 135 136 comm = "Test COMM 2"; 137 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 138 139 evlist__disable(evlist); 140 141 found = find_comm(evlist, comm); 142 if (found != 1) { 143 pr_debug("Seconf time, failed to find tracking event.\n"); 144 goto out_err; 145 } 146 147 err = 0; 148 149 out_err: 150 if (evlist) { 151 evlist__disable(evlist); 152 evlist__delete(evlist); 153 } else { 154 perf_cpu_map__put(cpus); 155 perf_thread_map__put(threads); 156 } 157 158 return err; 159 } 160