3 #include "thread_map.h"
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
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.
15 * Then it checks if the number of syscalls reported as perf events by
16 * the kernel corresponds to the number of syscalls made.
18 int test__basic_mmap(void)
21 union perf_event
*event
;
22 struct thread_map
*threads
;
24 struct perf_evlist
*evlist
;
26 const char *syscall_names
[] = { "getsid", "getppid", "getpgid", };
27 pid_t (*syscalls
[])(void) = { (void *)getsid
, getppid
, (void*)getpgid
};
28 #define nsyscalls ARRAY_SIZE(syscall_names)
29 unsigned int nr_events
[nsyscalls
],
30 expected_nr_events
[nsyscalls
], i
, j
;
31 struct perf_evsel
*evsels
[nsyscalls
], *evsel
;
32 char sbuf
[STRERR_BUFSIZE
];
34 threads
= thread_map__new(-1, getpid(), UINT_MAX
);
35 if (threads
== NULL
) {
36 pr_debug("thread_map__new\n");
40 cpus
= cpu_map__new(NULL
);
42 pr_debug("cpu_map__new\n");
43 goto out_free_threads
;
47 CPU_SET(cpus
->map
[0], &cpu_set
);
48 sched_setaffinity(0, sizeof(cpu_set
), &cpu_set
);
49 if (sched_setaffinity(0, sizeof(cpu_set
), &cpu_set
) < 0) {
50 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
51 cpus
->map
[0], strerror_r(errno
, sbuf
, sizeof(sbuf
)));
55 evlist
= perf_evlist__new();
57 pr_debug("perf_evlist__new\n");
61 perf_evlist__set_maps(evlist
, cpus
, threads
);
63 for (i
= 0; i
< nsyscalls
; ++i
) {
66 snprintf(name
, sizeof(name
), "sys_enter_%s", syscall_names
[i
]);
67 evsels
[i
] = perf_evsel__newtp("syscalls", name
);
68 if (evsels
[i
] == NULL
) {
69 pr_debug("perf_evsel__new\n");
70 goto out_delete_evlist
;
73 evsels
[i
]->attr
.wakeup_events
= 1;
74 perf_evsel__set_sample_id(evsels
[i
], false);
76 perf_evlist__add(evlist
, evsels
[i
]);
78 if (perf_evsel__open(evsels
[i
], cpus
, threads
) < 0) {
79 pr_debug("failed to open counter: %s, "
80 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
81 strerror_r(errno
, sbuf
, sizeof(sbuf
)));
82 goto out_delete_evlist
;
86 expected_nr_events
[i
] = 1 + rand() % 127;
89 if (perf_evlist__mmap(evlist
, 128, true) < 0) {
90 pr_debug("failed to mmap events: %d (%s)\n", errno
,
91 strerror_r(errno
, sbuf
, sizeof(sbuf
)));
92 goto out_delete_evlist
;
95 for (i
= 0; i
< nsyscalls
; ++i
)
96 for (j
= 0; j
< expected_nr_events
[i
]; ++j
) {
97 int foo
= syscalls
[i
]();
101 while ((event
= perf_evlist__mmap_read(evlist
, 0)) != NULL
) {
102 struct perf_sample sample
;
104 if (event
->header
.type
!= PERF_RECORD_SAMPLE
) {
105 pr_debug("unexpected %s event\n",
106 perf_event__name(event
->header
.type
));
107 goto out_delete_evlist
;
110 err
= perf_evlist__parse_sample(evlist
, event
, &sample
);
112 pr_err("Can't parse sample, err = %d\n", err
);
113 goto out_delete_evlist
;
117 evsel
= perf_evlist__id2evsel(evlist
, sample
.id
);
119 pr_debug("event with id %" PRIu64
120 " doesn't map to an evsel\n", sample
.id
);
121 goto out_delete_evlist
;
123 nr_events
[evsel
->idx
]++;
124 perf_evlist__mmap_consume(evlist
, 0);
128 evlist__for_each(evlist
, evsel
) {
129 if (nr_events
[evsel
->idx
] != expected_nr_events
[evsel
->idx
]) {
130 pr_debug("expected %d %s events, got %d\n",
131 expected_nr_events
[evsel
->idx
],
132 perf_evsel__name(evsel
), nr_events
[evsel
->idx
]);
134 goto out_delete_evlist
;
139 perf_evlist__delete(evlist
);
145 thread_map__put(threads
);
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