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(void)52 int test__keep_tracking(void)
53 {
54 struct record_opts opts = {
55 .mmap_pages = UINT_MAX,
56 .user_freq = UINT_MAX,
57 .user_interval = ULLONG_MAX,
58 .freq = 4000,
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);
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_evlist__disable_event(evlist, 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