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