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 "record.h" 12 #include "thread_map.h" 13 #include "cpumap.h" 14 #include "tests.h" 15 16 #define CHECK__(x) { \ 17 while ((x) < 0) { \ 18 pr_debug(#x " failed!\n"); \ 19 goto out_err; \ 20 } \ 21 } 22 23 #define CHECK_NOT_NULL__(x) { \ 24 while ((x) == NULL) { \ 25 pr_debug(#x " failed!\n"); \ 26 goto out_err; \ 27 } \ 28 } 29 30 static int find_comm(struct evlist *evlist, const char *comm) 31 { 32 union perf_event *event; 33 struct perf_mmap *md; 34 int i, found; 35 36 found = 0; 37 for (i = 0; i < evlist->nr_mmaps; i++) { 38 md = &evlist->mmap[i]; 39 if (perf_mmap__read_init(md) < 0) 40 continue; 41 while ((event = perf_mmap__read_event(md)) != NULL) { 42 if (event->header.type == PERF_RECORD_COMM && 43 (pid_t)event->comm.pid == getpid() && 44 (pid_t)event->comm.tid == getpid() && 45 strcmp(event->comm.comm, comm) == 0) 46 found += 1; 47 perf_mmap__consume(md); 48 } 49 perf_mmap__read_done(md); 50 } 51 return found; 52 } 53 54 /** 55 * test__keep_tracking - test using a dummy software event to keep tracking. 56 * 57 * This function implements a test that checks that tracking events continue 58 * when an event is disabled but a dummy software event is not disabled. If the 59 * test passes %0 is returned, otherwise %-1 is returned. 60 */ 61 int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused) 62 { 63 struct record_opts opts = { 64 .mmap_pages = UINT_MAX, 65 .user_freq = UINT_MAX, 66 .user_interval = ULLONG_MAX, 67 .target = { 68 .uses_mmap = true, 69 }, 70 }; 71 struct perf_thread_map *threads = NULL; 72 struct perf_cpu_map *cpus = NULL; 73 struct evlist *evlist = NULL; 74 struct evsel *evsel = NULL; 75 int found, err = -1; 76 const char *comm; 77 78 threads = thread_map__new(-1, getpid(), UINT_MAX); 79 CHECK_NOT_NULL__(threads); 80 81 cpus = perf_cpu_map__new(NULL); 82 CHECK_NOT_NULL__(cpus); 83 84 evlist = evlist__new(); 85 CHECK_NOT_NULL__(evlist); 86 87 perf_evlist__set_maps(&evlist->core, cpus, threads); 88 89 CHECK__(parse_events(evlist, "dummy:u", NULL)); 90 CHECK__(parse_events(evlist, "cycles:u", NULL)); 91 92 perf_evlist__config(evlist, &opts, NULL); 93 94 evsel = perf_evlist__first(evlist); 95 96 evsel->core.attr.comm = 1; 97 evsel->core.attr.disabled = 1; 98 evsel->core.attr.enable_on_exec = 0; 99 100 if (evlist__open(evlist) < 0) { 101 pr_debug("Unable to open dummy and cycles event\n"); 102 err = TEST_SKIP; 103 goto out_err; 104 } 105 106 CHECK__(perf_evlist__mmap(evlist, UINT_MAX)); 107 108 /* 109 * First, test that a 'comm' event can be found when the event is 110 * enabled. 111 */ 112 113 evlist__enable(evlist); 114 115 comm = "Test COMM 1"; 116 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 117 118 evlist__disable(evlist); 119 120 found = find_comm(evlist, comm); 121 if (found != 1) { 122 pr_debug("First time, failed to find tracking event.\n"); 123 goto out_err; 124 } 125 126 /* 127 * Secondly, test that a 'comm' event can be found when the event is 128 * disabled with the dummy event still enabled. 129 */ 130 131 evlist__enable(evlist); 132 133 evsel = perf_evlist__last(evlist); 134 135 CHECK__(evsel__disable(evsel)); 136 137 comm = "Test COMM 2"; 138 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 139 140 evlist__disable(evlist); 141 142 found = find_comm(evlist, comm); 143 if (found != 1) { 144 pr_debug("Seconf time, failed to find tracking event.\n"); 145 goto out_err; 146 } 147 148 err = 0; 149 150 out_err: 151 if (evlist) { 152 evlist__disable(evlist); 153 evlist__delete(evlist); 154 } else { 155 perf_cpu_map__put(cpus); 156 perf_thread_map__put(threads); 157 } 158 159 return err; 160 } 161