1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
6 #include "parse-events.h"
9 #include "thread_map.h"
13 #define CHECK__(x) { \
15 pr_debug(#x " failed!\n"); \
20 #define CHECK_NOT_NULL__(x) { \
21 while ((x) == NULL) { \
22 pr_debug(#x " failed!\n"); \
27 static int find_comm(struct perf_evlist *evlist, const char *comm)
29 union perf_event *event;
34 for (i = 0; i < evlist->nr_mmaps; i++) {
35 md = &evlist->mmap[i];
36 if (perf_mmap__read_init(md) < 0)
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)
44 perf_mmap__consume(md);
46 perf_mmap__read_done(md);
52 * test__keep_tracking - test using a dummy software event to keep tracking.
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.
58 int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
60 struct record_opts opts = {
61 .mmap_pages = UINT_MAX,
62 .user_freq = UINT_MAX,
63 .user_interval = ULLONG_MAX,
68 struct thread_map *threads = NULL;
69 struct cpu_map *cpus = NULL;
70 struct perf_evlist *evlist = NULL;
71 struct perf_evsel *evsel = NULL;
75 threads = thread_map__new(-1, getpid(), UINT_MAX);
76 CHECK_NOT_NULL__(threads);
78 cpus = cpu_map__new(NULL);
79 CHECK_NOT_NULL__(cpus);
81 evlist = perf_evlist__new();
82 CHECK_NOT_NULL__(evlist);
84 perf_evlist__set_maps(evlist, cpus, threads);
86 CHECK__(parse_events(evlist, "dummy:u", NULL));
87 CHECK__(parse_events(evlist, "cycles:u", NULL));
89 perf_evlist__config(evlist, &opts, NULL);
91 evsel = perf_evlist__first(evlist);
94 evsel->attr.disabled = 1;
95 evsel->attr.enable_on_exec = 0;
97 if (perf_evlist__open(evlist) < 0) {
98 pr_debug("Unable to open dummy and cycles event\n");
103 CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
106 * First, test that a 'comm' event can be found when the event is
110 perf_evlist__enable(evlist);
112 comm = "Test COMM 1";
113 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
115 perf_evlist__disable(evlist);
117 found = find_comm(evlist, comm);
119 pr_debug("First time, failed to find tracking event.\n");
124 * Secondly, test that a 'comm' event can be found when the event is
125 * disabled with the dummy event still enabled.
128 perf_evlist__enable(evlist);
130 evsel = perf_evlist__last(evlist);
132 CHECK__(perf_evsel__disable(evsel));
134 comm = "Test COMM 2";
135 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
137 perf_evlist__disable(evlist);
139 found = find_comm(evlist, comm);
141 pr_debug("Seconf time, failed to find tracking event.\n");
149 perf_evlist__disable(evlist);
150 perf_evlist__delete(evlist);
153 thread_map__put(threads);