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 "debug.h" 9 #include "parse-events.h" 10 #include "evlist.h" 11 #include "evsel.h" 12 #include "record.h" 13 #include "thread_map.h" 14 #include "cpumap.h" 15 #include "tests.h" 16 17 #define CHECK__(x) { \ 18 while ((x) < 0) { \ 19 pr_debug(#x " failed!\n"); \ 20 goto out_err; \ 21 } \ 22 } 23 24 #define CHECK_NOT_NULL__(x) { \ 25 while ((x) == NULL) { \ 26 pr_debug(#x " failed!\n"); \ 27 goto out_err; \ 28 } \ 29 } 30 31 static int find_comm(struct evlist *evlist, const char *comm) 32 { 33 union perf_event *event; 34 struct perf_mmap *md; 35 int i, found; 36 37 found = 0; 38 for (i = 0; i < evlist->nr_mmaps; i++) { 39 md = &evlist->mmap[i]; 40 if (perf_mmap__read_init(md) < 0) 41 continue; 42 while ((event = perf_mmap__read_event(md)) != NULL) { 43 if (event->header.type == PERF_RECORD_COMM && 44 (pid_t)event->comm.pid == getpid() && 45 (pid_t)event->comm.tid == getpid() && 46 strcmp(event->comm.comm, comm) == 0) 47 found += 1; 48 perf_mmap__consume(md); 49 } 50 perf_mmap__read_done(md); 51 } 52 return found; 53 } 54 55 /** 56 * test__keep_tracking - test using a dummy software event to keep tracking. 57 * 58 * This function implements a test that checks that tracking events continue 59 * when an event is disabled but a dummy software event is not disabled. If the 60 * test passes %0 is returned, otherwise %-1 is returned. 61 */ 62 int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused) 63 { 64 struct record_opts opts = { 65 .mmap_pages = UINT_MAX, 66 .user_freq = UINT_MAX, 67 .user_interval = ULLONG_MAX, 68 .target = { 69 .uses_mmap = true, 70 }, 71 }; 72 struct perf_thread_map *threads = NULL; 73 struct perf_cpu_map *cpus = NULL; 74 struct evlist *evlist = NULL; 75 struct evsel *evsel = NULL; 76 int found, err = -1; 77 const char *comm; 78 79 threads = thread_map__new(-1, getpid(), UINT_MAX); 80 CHECK_NOT_NULL__(threads); 81 82 cpus = perf_cpu_map__new(NULL); 83 CHECK_NOT_NULL__(cpus); 84 85 evlist = evlist__new(); 86 CHECK_NOT_NULL__(evlist); 87 88 perf_evlist__set_maps(&evlist->core, cpus, threads); 89 90 CHECK__(parse_events(evlist, "dummy:u", NULL)); 91 CHECK__(parse_events(evlist, "cycles:u", NULL)); 92 93 perf_evlist__config(evlist, &opts, NULL); 94 95 evsel = perf_evlist__first(evlist); 96 97 evsel->core.attr.comm = 1; 98 evsel->core.attr.disabled = 1; 99 evsel->core.attr.enable_on_exec = 0; 100 101 if (evlist__open(evlist) < 0) { 102 pr_debug("Unable to open dummy and cycles event\n"); 103 err = TEST_SKIP; 104 goto out_err; 105 } 106 107 CHECK__(perf_evlist__mmap(evlist, UINT_MAX)); 108 109 /* 110 * First, test that a 'comm' event can be found when the event is 111 * enabled. 112 */ 113 114 evlist__enable(evlist); 115 116 comm = "Test COMM 1"; 117 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 118 119 evlist__disable(evlist); 120 121 found = find_comm(evlist, comm); 122 if (found != 1) { 123 pr_debug("First time, failed to find tracking event.\n"); 124 goto out_err; 125 } 126 127 /* 128 * Secondly, test that a 'comm' event can be found when the event is 129 * disabled with the dummy event still enabled. 130 */ 131 132 evlist__enable(evlist); 133 134 evsel = perf_evlist__last(evlist); 135 136 CHECK__(evsel__disable(evsel)); 137 138 comm = "Test COMM 2"; 139 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 140 141 evlist__disable(evlist); 142 143 found = find_comm(evlist, comm); 144 if (found != 1) { 145 pr_debug("Seconf time, failed to find tracking event.\n"); 146 goto out_err; 147 } 148 149 err = 0; 150 151 out_err: 152 if (evlist) { 153 evlist__disable(evlist); 154 evlist__delete(evlist); 155 } else { 156 perf_cpu_map__put(cpus); 157 perf_thread_map__put(threads); 158 } 159 160 return err; 161 } 162