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Commit | Line | Data |
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a65b9c62 JO |
1 | #include "evlist.h" |
2 | #include "evsel.h" | |
3 | #include "thread_map.h" | |
4 | #include "cpumap.h" | |
5 | #include "tests.h" | |
6 | ||
7 | /* | |
8 | * This test will generate random numbers of calls to some getpid syscalls, | |
9 | * then establish an mmap for a group of events that are created to monitor | |
10 | * the syscalls. | |
11 | * | |
12 | * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated | |
13 | * sample.id field to map back to its respective perf_evsel instance. | |
14 | * | |
15 | * Then it checks if the number of syscalls reported as perf events by | |
16 | * the kernel corresponds to the number of syscalls made. | |
17 | */ | |
18 | int test__basic_mmap(void) | |
19 | { | |
20 | int err = -1; | |
21 | union perf_event *event; | |
22 | struct thread_map *threads; | |
23 | struct cpu_map *cpus; | |
24 | struct perf_evlist *evlist; | |
a65b9c62 JO |
25 | cpu_set_t cpu_set; |
26 | const char *syscall_names[] = { "getsid", "getppid", "getpgrp", | |
27 | "getpgid", }; | |
28 | pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp, | |
29 | (void*)getpgid }; | |
30 | #define nsyscalls ARRAY_SIZE(syscall_names) | |
a65b9c62 JO |
31 | unsigned int nr_events[nsyscalls], |
32 | expected_nr_events[nsyscalls], i, j; | |
33 | struct perf_evsel *evsels[nsyscalls], *evsel; | |
34 | ||
a65b9c62 JO |
35 | threads = thread_map__new(-1, getpid(), UINT_MAX); |
36 | if (threads == NULL) { | |
37 | pr_debug("thread_map__new\n"); | |
38 | return -1; | |
39 | } | |
40 | ||
41 | cpus = cpu_map__new(NULL); | |
42 | if (cpus == NULL) { | |
43 | pr_debug("cpu_map__new\n"); | |
44 | goto out_free_threads; | |
45 | } | |
46 | ||
47 | CPU_ZERO(&cpu_set); | |
48 | CPU_SET(cpus->map[0], &cpu_set); | |
49 | sched_setaffinity(0, sizeof(cpu_set), &cpu_set); | |
50 | if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { | |
51 | pr_debug("sched_setaffinity() failed on CPU %d: %s ", | |
52 | cpus->map[0], strerror(errno)); | |
53 | goto out_free_cpus; | |
54 | } | |
55 | ||
334fe7a3 | 56 | evlist = perf_evlist__new(); |
a65b9c62 JO |
57 | if (evlist == NULL) { |
58 | pr_debug("perf_evlist__new\n"); | |
59 | goto out_free_cpus; | |
60 | } | |
61 | ||
334fe7a3 NK |
62 | perf_evlist__set_maps(evlist, cpus, threads); |
63 | ||
a65b9c62 | 64 | for (i = 0; i < nsyscalls; ++i) { |
a60d7953 ACM |
65 | char name[64]; |
66 | ||
67 | snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); | |
68 | evsels[i] = perf_evsel__newtp("syscalls", name, i); | |
a65b9c62 JO |
69 | if (evsels[i] == NULL) { |
70 | pr_debug("perf_evsel__new\n"); | |
71 | goto out_free_evlist; | |
72 | } | |
73 | ||
a60d7953 | 74 | evsels[i]->attr.wakeup_events = 1; |
75562573 | 75 | perf_evsel__set_sample_id(evsels[i], false); |
a60d7953 | 76 | |
a65b9c62 JO |
77 | perf_evlist__add(evlist, evsels[i]); |
78 | ||
79 | if (perf_evsel__open(evsels[i], cpus, threads) < 0) { | |
80 | pr_debug("failed to open counter: %s, " | |
81 | "tweak /proc/sys/kernel/perf_event_paranoid?\n", | |
82 | strerror(errno)); | |
83 | goto out_close_fd; | |
84 | } | |
a60d7953 ACM |
85 | |
86 | nr_events[i] = 0; | |
87 | expected_nr_events[i] = 1 + rand() % 127; | |
a65b9c62 JO |
88 | } |
89 | ||
90 | if (perf_evlist__mmap(evlist, 128, true) < 0) { | |
91 | pr_debug("failed to mmap events: %d (%s)\n", errno, | |
92 | strerror(errno)); | |
93 | goto out_close_fd; | |
94 | } | |
95 | ||
96 | for (i = 0; i < nsyscalls; ++i) | |
97 | for (j = 0; j < expected_nr_events[i]; ++j) { | |
98 | int foo = syscalls[i](); | |
99 | ++foo; | |
100 | } | |
101 | ||
102 | while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { | |
103 | struct perf_sample sample; | |
104 | ||
105 | if (event->header.type != PERF_RECORD_SAMPLE) { | |
106 | pr_debug("unexpected %s event\n", | |
107 | perf_event__name(event->header.type)); | |
108 | goto out_munmap; | |
109 | } | |
110 | ||
111 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
112 | if (err) { | |
113 | pr_err("Can't parse sample, err = %d\n", err); | |
114 | goto out_munmap; | |
115 | } | |
116 | ||
c5d3d50d | 117 | err = -1; |
a65b9c62 JO |
118 | evsel = perf_evlist__id2evsel(evlist, sample.id); |
119 | if (evsel == NULL) { | |
120 | pr_debug("event with id %" PRIu64 | |
121 | " doesn't map to an evsel\n", sample.id); | |
122 | goto out_munmap; | |
123 | } | |
124 | nr_events[evsel->idx]++; | |
8e50d384 | 125 | perf_evlist__mmap_consume(evlist, 0); |
a65b9c62 JO |
126 | } |
127 | ||
c5d3d50d | 128 | err = 0; |
a65b9c62 JO |
129 | list_for_each_entry(evsel, &evlist->entries, node) { |
130 | if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { | |
131 | pr_debug("expected %d %s events, got %d\n", | |
132 | expected_nr_events[evsel->idx], | |
133 | perf_evsel__name(evsel), nr_events[evsel->idx]); | |
c5d3d50d | 134 | err = -1; |
a65b9c62 JO |
135 | goto out_munmap; |
136 | } | |
137 | } | |
138 | ||
a65b9c62 JO |
139 | out_munmap: |
140 | perf_evlist__munmap(evlist); | |
141 | out_close_fd: | |
142 | for (i = 0; i < nsyscalls; ++i) | |
143 | perf_evsel__close_fd(evsels[i], 1, threads->nr); | |
144 | out_free_evlist: | |
145 | perf_evlist__delete(evlist); | |
146 | out_free_cpus: | |
147 | cpu_map__delete(cpus); | |
148 | out_free_threads: | |
149 | thread_map__delete(threads); | |
150 | return err; | |
151 | } |