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395c3070 AH |
1 | #include <sys/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 | ||
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 | } | |
40 | } | |
41 | return found; | |
42 | } | |
43 | ||
44 | /** | |
45 | * test__keep_tracking - test using a dummy software event to keep tracking. | |
46 | * | |
47 | * This function implements a test that checks that tracking events continue | |
48 | * when an event is disabled but a dummy software event is not disabled. If the | |
49 | * test passes %0 is returned, otherwise %-1 is returned. | |
50 | */ | |
51 | int test__keep_tracking(void) | |
52 | { | |
53 | struct perf_record_opts opts = { | |
54 | .mmap_pages = UINT_MAX, | |
55 | .user_freq = UINT_MAX, | |
56 | .user_interval = ULLONG_MAX, | |
57 | .freq = 4000, | |
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")); | |
81 | CHECK__(parse_events(evlist, "cycles:u")); | |
82 | ||
83 | perf_evlist__config(evlist, &opts); | |
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 | fprintf(stderr, " (not supported)"); | |
93 | err = 0; | |
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_evlist__disable_event(evlist, 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__munmap(evlist); | |
145 | perf_evlist__close(evlist); | |
146 | perf_evlist__delete(evlist); | |
147 | } | |
148 | if (cpus) | |
149 | cpu_map__delete(cpus); | |
150 | if (threads) | |
151 | thread_map__delete(threads); | |
152 | ||
153 | return err; | |
154 | } |