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1#include "evlist.h"
2#include "evsel.h"
3#include "thread_map.h"
4#include "cpumap.h"
5#include "tests.h"
6#include <linux/err.h>
7
8/*
9 * This test will generate random numbers of calls to some getpid syscalls,
10 * then establish an mmap for a group of events that are created to monitor
11 * the syscalls.
12 *
13 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
14 * sample.id field to map back to its respective perf_evsel instance.
15 *
16 * Then it checks if the number of syscalls reported as perf events by
17 * the kernel corresponds to the number of syscalls made.
18 */
19int test__basic_mmap(int subtest __maybe_unused)
20{
21 int err = -1;
22 union perf_event *event;
23 struct thread_map *threads;
24 struct cpu_map *cpus;
25 struct perf_evlist *evlist;
26 cpu_set_t cpu_set;
27 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
28 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
29#define nsyscalls ARRAY_SIZE(syscall_names)
30 unsigned int nr_events[nsyscalls],
31 expected_nr_events[nsyscalls], i, j;
32 struct perf_evsel *evsels[nsyscalls], *evsel;
33 char sbuf[STRERR_BUFSIZE];
34
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_r(errno, sbuf, sizeof(sbuf)));
53 goto out_free_cpus;
54 }
55
56 evlist = perf_evlist__new();
57 if (evlist == NULL) {
58 pr_debug("perf_evlist__new\n");
59 goto out_free_cpus;
60 }
61
62 perf_evlist__set_maps(evlist, cpus, threads);
63
64 for (i = 0; i < nsyscalls; ++i) {
65 char name[64];
66
67 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
68 evsels[i] = perf_evsel__newtp("syscalls", name);
69 if (IS_ERR(evsels[i])) {
70 pr_debug("perf_evsel__new\n");
71 goto out_delete_evlist;
72 }
73
74 evsels[i]->attr.wakeup_events = 1;
75 perf_evsel__set_sample_id(evsels[i], false);
76
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_r(errno, sbuf, sizeof(sbuf)));
83 goto out_delete_evlist;
84 }
85
86 nr_events[i] = 0;
87 expected_nr_events[i] = 1 + rand() % 127;
88 }
89
90 if (perf_evlist__mmap(evlist, 128, true) < 0) {
91 pr_debug("failed to mmap events: %d (%s)\n", errno,
92 strerror_r(errno, sbuf, sizeof(sbuf)));
93 goto out_delete_evlist;
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_delete_evlist;
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_delete_evlist;
115 }
116
117 err = -1;
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_delete_evlist;
123 }
124 nr_events[evsel->idx]++;
125 perf_evlist__mmap_consume(evlist, 0);
126 }
127
128 err = 0;
129 evlist__for_each(evlist, evsel) {
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]);
134 err = -1;
135 goto out_delete_evlist;
136 }
137 }
138
139out_delete_evlist:
140 perf_evlist__delete(evlist);
141 cpus = NULL;
142 threads = NULL;
143out_free_cpus:
144 cpu_map__put(cpus);
145out_free_threads:
146 thread_map__put(threads);
147 return err;
148}
1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <inttypes.h>
4/* For the CLR_() macros */
5#include <pthread.h>
6
7#include "evlist.h"
8#include "evsel.h"
9#include "thread_map.h"
10#include "cpumap.h"
11#include "tests.h"
12#include <linux/err.h>
13#include <linux/kernel.h>
14
15/*
16 * This test will generate random numbers of calls to some getpid syscalls,
17 * then establish an mmap for a group of events that are created to monitor
18 * the syscalls.
19 *
20 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
21 * sample.id field to map back to its respective perf_evsel instance.
22 *
23 * Then it checks if the number of syscalls reported as perf events by
24 * the kernel corresponds to the number of syscalls made.
25 */
26int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused)
27{
28 int err = -1;
29 union perf_event *event;
30 struct thread_map *threads;
31 struct cpu_map *cpus;
32 struct perf_evlist *evlist;
33 cpu_set_t cpu_set;
34 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
35 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
36#define nsyscalls ARRAY_SIZE(syscall_names)
37 unsigned int nr_events[nsyscalls],
38 expected_nr_events[nsyscalls], i, j;
39 struct perf_evsel *evsels[nsyscalls], *evsel;
40 char sbuf[STRERR_BUFSIZE];
41 struct perf_mmap *md;
42
43 threads = thread_map__new(-1, getpid(), UINT_MAX);
44 if (threads == NULL) {
45 pr_debug("thread_map__new\n");
46 return -1;
47 }
48
49 cpus = cpu_map__new(NULL);
50 if (cpus == NULL) {
51 pr_debug("cpu_map__new\n");
52 goto out_free_threads;
53 }
54
55 CPU_ZERO(&cpu_set);
56 CPU_SET(cpus->map[0], &cpu_set);
57 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
58 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
59 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
60 cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf)));
61 goto out_free_cpus;
62 }
63
64 evlist = perf_evlist__new();
65 if (evlist == NULL) {
66 pr_debug("perf_evlist__new\n");
67 goto out_free_cpus;
68 }
69
70 perf_evlist__set_maps(evlist, cpus, threads);
71
72 for (i = 0; i < nsyscalls; ++i) {
73 char name[64];
74
75 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
76 evsels[i] = perf_evsel__newtp("syscalls", name);
77 if (IS_ERR(evsels[i])) {
78 pr_debug("perf_evsel__new(%s)\n", name);
79 goto out_delete_evlist;
80 }
81
82 evsels[i]->attr.wakeup_events = 1;
83 perf_evsel__set_sample_id(evsels[i], false);
84
85 perf_evlist__add(evlist, evsels[i]);
86
87 if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
88 pr_debug("failed to open counter: %s, "
89 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
90 str_error_r(errno, sbuf, sizeof(sbuf)));
91 goto out_delete_evlist;
92 }
93
94 nr_events[i] = 0;
95 expected_nr_events[i] = 1 + rand() % 127;
96 }
97
98 if (perf_evlist__mmap(evlist, 128) < 0) {
99 pr_debug("failed to mmap events: %d (%s)\n", errno,
100 str_error_r(errno, sbuf, sizeof(sbuf)));
101 goto out_delete_evlist;
102 }
103
104 for (i = 0; i < nsyscalls; ++i)
105 for (j = 0; j < expected_nr_events[i]; ++j) {
106 int foo = syscalls[i]();
107 ++foo;
108 }
109
110 md = &evlist->mmap[0];
111 if (perf_mmap__read_init(md) < 0)
112 goto out_init;
113
114 while ((event = perf_mmap__read_event(md)) != NULL) {
115 struct perf_sample sample;
116
117 if (event->header.type != PERF_RECORD_SAMPLE) {
118 pr_debug("unexpected %s event\n",
119 perf_event__name(event->header.type));
120 goto out_delete_evlist;
121 }
122
123 err = perf_evlist__parse_sample(evlist, event, &sample);
124 if (err) {
125 pr_err("Can't parse sample, err = %d\n", err);
126 goto out_delete_evlist;
127 }
128
129 err = -1;
130 evsel = perf_evlist__id2evsel(evlist, sample.id);
131 if (evsel == NULL) {
132 pr_debug("event with id %" PRIu64
133 " doesn't map to an evsel\n", sample.id);
134 goto out_delete_evlist;
135 }
136 nr_events[evsel->idx]++;
137 perf_mmap__consume(md);
138 }
139 perf_mmap__read_done(md);
140
141out_init:
142 err = 0;
143 evlist__for_each_entry(evlist, evsel) {
144 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
145 pr_debug("expected %d %s events, got %d\n",
146 expected_nr_events[evsel->idx],
147 perf_evsel__name(evsel), nr_events[evsel->idx]);
148 err = -1;
149 goto out_delete_evlist;
150 }
151 }
152
153out_delete_evlist:
154 perf_evlist__delete(evlist);
155 cpus = NULL;
156 threads = NULL;
157out_free_cpus:
158 cpu_map__put(cpus);
159out_free_threads:
160 thread_map__put(threads);
161 return err;
162}