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