profiling: Remove unused timer hook
[~shefty/rdma-dev.git] / tools / perf / tests / mmap-basic.c
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;
25         struct perf_event_attr attr = {
26                 .type           = PERF_TYPE_TRACEPOINT,
27                 .read_format    = PERF_FORMAT_ID,
28                 .sample_type    = PERF_SAMPLE_ID,
29                 .watermark      = 0,
30         };
31         cpu_set_t cpu_set;
32         const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
33                                         "getpgid", };
34         pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
35                                       (void*)getpgid };
36 #define nsyscalls ARRAY_SIZE(syscall_names)
37         int ids[nsyscalls];
38         unsigned int nr_events[nsyscalls],
39                      expected_nr_events[nsyscalls], i, j;
40         struct perf_evsel *evsels[nsyscalls], *evsel;
41
42         for (i = 0; i < nsyscalls; ++i) {
43                 char name[64];
44
45                 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
46                 ids[i] = trace_event__id(name);
47                 if (ids[i] < 0) {
48                         pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
49                         return -1;
50                 }
51                 nr_events[i] = 0;
52                 expected_nr_events[i] = random() % 257;
53         }
54
55         threads = thread_map__new(-1, getpid(), UINT_MAX);
56         if (threads == NULL) {
57                 pr_debug("thread_map__new\n");
58                 return -1;
59         }
60
61         cpus = cpu_map__new(NULL);
62         if (cpus == NULL) {
63                 pr_debug("cpu_map__new\n");
64                 goto out_free_threads;
65         }
66
67         CPU_ZERO(&cpu_set);
68         CPU_SET(cpus->map[0], &cpu_set);
69         sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
70         if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
71                 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
72                          cpus->map[0], strerror(errno));
73                 goto out_free_cpus;
74         }
75
76         evlist = perf_evlist__new(cpus, threads);
77         if (evlist == NULL) {
78                 pr_debug("perf_evlist__new\n");
79                 goto out_free_cpus;
80         }
81
82         /* anonymous union fields, can't be initialized above */
83         attr.wakeup_events = 1;
84         attr.sample_period = 1;
85
86         for (i = 0; i < nsyscalls; ++i) {
87                 attr.config = ids[i];
88                 evsels[i] = perf_evsel__new(&attr, i);
89                 if (evsels[i] == NULL) {
90                         pr_debug("perf_evsel__new\n");
91                         goto out_free_evlist;
92                 }
93
94                 perf_evlist__add(evlist, evsels[i]);
95
96                 if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
97                         pr_debug("failed to open counter: %s, "
98                                  "tweak /proc/sys/kernel/perf_event_paranoid?\n",
99                                  strerror(errno));
100                         goto out_close_fd;
101                 }
102         }
103
104         if (perf_evlist__mmap(evlist, 128, true) < 0) {
105                 pr_debug("failed to mmap events: %d (%s)\n", errno,
106                          strerror(errno));
107                 goto out_close_fd;
108         }
109
110         for (i = 0; i < nsyscalls; ++i)
111                 for (j = 0; j < expected_nr_events[i]; ++j) {
112                         int foo = syscalls[i]();
113                         ++foo;
114                 }
115
116         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
117                 struct perf_sample sample;
118
119                 if (event->header.type != PERF_RECORD_SAMPLE) {
120                         pr_debug("unexpected %s event\n",
121                                  perf_event__name(event->header.type));
122                         goto out_munmap;
123                 }
124
125                 err = perf_evlist__parse_sample(evlist, event, &sample);
126                 if (err) {
127                         pr_err("Can't parse sample, err = %d\n", err);
128                         goto out_munmap;
129                 }
130
131                 evsel = perf_evlist__id2evsel(evlist, sample.id);
132                 if (evsel == NULL) {
133                         pr_debug("event with id %" PRIu64
134                                  " doesn't map to an evsel\n", sample.id);
135                         goto out_munmap;
136                 }
137                 nr_events[evsel->idx]++;
138         }
139
140         list_for_each_entry(evsel, &evlist->entries, node) {
141                 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
142                         pr_debug("expected %d %s events, got %d\n",
143                                  expected_nr_events[evsel->idx],
144                                  perf_evsel__name(evsel), nr_events[evsel->idx]);
145                         goto out_munmap;
146                 }
147         }
148
149         err = 0;
150 out_munmap:
151         perf_evlist__munmap(evlist);
152 out_close_fd:
153         for (i = 0; i < nsyscalls; ++i)
154                 perf_evsel__close_fd(evsels[i], 1, threads->nr);
155 out_free_evlist:
156         perf_evlist__delete(evlist);
157 out_free_cpus:
158         cpu_map__delete(cpus);
159 out_free_threads:
160         thread_map__delete(threads);
161         return err;
162 }