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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Test backward bit in event attribute, read ring buffer from end to
4 * beginning
5 */
6
7#include <evlist.h>
8#include <sys/prctl.h>
9#include "record.h"
10#include "tests.h"
11#include "debug.h"
12#include "parse-events.h"
13#include "util/mmap.h"
14#include <errno.h>
15#include <linux/string.h>
16#include <perf/mmap.h>
17
18#define NR_ITERS 111
19
20static void testcase(void)
21{
22 int i;
23
24 for (i = 0; i < NR_ITERS; i++) {
25 char proc_name[15];
26
27 snprintf(proc_name, sizeof(proc_name), "p:%d\n", i);
28 prctl(PR_SET_NAME, proc_name);
29 }
30}
31
32static int count_samples(struct evlist *evlist, int *sample_count,
33 int *comm_count)
34{
35 int i;
36
37 for (i = 0; i < evlist->core.nr_mmaps; i++) {
38 struct mmap *map = &evlist->overwrite_mmap[i];
39 union perf_event *event;
40
41 perf_mmap__read_init(&map->core);
42 while ((event = perf_mmap__read_event(&map->core)) != NULL) {
43 const u32 type = event->header.type;
44
45 switch (type) {
46 case PERF_RECORD_SAMPLE:
47 (*sample_count)++;
48 break;
49 case PERF_RECORD_COMM:
50 (*comm_count)++;
51 break;
52 default:
53 pr_err("Unexpected record of type %d\n", type);
54 return TEST_FAIL;
55 }
56 }
57 perf_mmap__read_done(&map->core);
58 }
59 return TEST_OK;
60}
61
62static int do_test(struct evlist *evlist, int mmap_pages,
63 int *sample_count, int *comm_count)
64{
65 int err;
66 char sbuf[STRERR_BUFSIZE];
67
68 err = evlist__mmap(evlist, mmap_pages);
69 if (err < 0) {
70 pr_debug("evlist__mmap: %s\n",
71 str_error_r(errno, sbuf, sizeof(sbuf)));
72 return TEST_FAIL;
73 }
74
75 evlist__enable(evlist);
76 testcase();
77 evlist__disable(evlist);
78
79 err = count_samples(evlist, sample_count, comm_count);
80 evlist__munmap(evlist);
81 return err;
82}
83
84
85static int test__backward_ring_buffer(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
86{
87 int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
88 char pid[16], sbuf[STRERR_BUFSIZE];
89 struct evlist *evlist;
90 struct evsel *evsel __maybe_unused;
91 struct parse_events_error parse_error;
92 struct record_opts opts = {
93 .target = {
94 .uid = UINT_MAX,
95 .uses_mmap = true,
96 },
97 .freq = 0,
98 .mmap_pages = 256,
99 .default_interval = 1,
100 };
101
102 snprintf(pid, sizeof(pid), "%d", getpid());
103 pid[sizeof(pid) - 1] = '\0';
104 opts.target.tid = opts.target.pid = pid;
105
106 evlist = evlist__new();
107 if (!evlist) {
108 pr_debug("Not enough memory to create evlist\n");
109 return TEST_FAIL;
110 }
111
112 err = evlist__create_maps(evlist, &opts.target);
113 if (err < 0) {
114 pr_debug("Not enough memory to create thread/cpu maps\n");
115 goto out_delete_evlist;
116 }
117
118 parse_events_error__init(&parse_error);
119 /*
120 * Set backward bit, ring buffer should be writing from end. Record
121 * it in aux evlist
122 */
123 err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);
124 parse_events_error__exit(&parse_error);
125 if (err) {
126 pr_debug("Failed to parse tracepoint event, try use root\n");
127 ret = TEST_SKIP;
128 goto out_delete_evlist;
129 }
130
131 evlist__config(evlist, &opts, NULL);
132
133 err = evlist__open(evlist);
134 if (err < 0) {
135 pr_debug("perf_evlist__open: %s\n",
136 str_error_r(errno, sbuf, sizeof(sbuf)));
137 goto out_delete_evlist;
138 }
139
140 ret = TEST_FAIL;
141 err = do_test(evlist, opts.mmap_pages, &sample_count,
142 &comm_count);
143 if (err != TEST_OK)
144 goto out_delete_evlist;
145
146 if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
147 pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
148 sample_count, comm_count);
149 goto out_delete_evlist;
150 }
151
152 evlist__close(evlist);
153
154 err = evlist__open(evlist);
155 if (err < 0) {
156 pr_debug("perf_evlist__open: %s\n",
157 str_error_r(errno, sbuf, sizeof(sbuf)));
158 goto out_delete_evlist;
159 }
160
161 err = do_test(evlist, 1, &sample_count, &comm_count);
162 if (err != TEST_OK)
163 goto out_delete_evlist;
164
165 ret = TEST_OK;
166out_delete_evlist:
167 evlist__delete(evlist);
168 return ret;
169}
170
171DEFINE_SUITE("Read backward ring buffer", backward_ring_buffer);
1/*
2 * Test backward bit in event attribute, read ring buffer from end to
3 * beginning
4 */
5
6#include <perf.h>
7#include <evlist.h>
8#include <sys/prctl.h>
9#include "tests.h"
10#include "debug.h"
11
12#define NR_ITERS 111
13
14static void testcase(void)
15{
16 int i;
17
18 for (i = 0; i < NR_ITERS; i++) {
19 char proc_name[10];
20
21 snprintf(proc_name, sizeof(proc_name), "p:%d\n", i);
22 prctl(PR_SET_NAME, proc_name);
23 }
24}
25
26static int count_samples(struct perf_evlist *evlist, int *sample_count,
27 int *comm_count)
28{
29 int i;
30
31 for (i = 0; i < evlist->nr_mmaps; i++) {
32 union perf_event *event;
33
34 perf_mmap__read_catchup(&evlist->backward_mmap[i]);
35 while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != NULL) {
36 const u32 type = event->header.type;
37
38 switch (type) {
39 case PERF_RECORD_SAMPLE:
40 (*sample_count)++;
41 break;
42 case PERF_RECORD_COMM:
43 (*comm_count)++;
44 break;
45 default:
46 pr_err("Unexpected record of type %d\n", type);
47 return TEST_FAIL;
48 }
49 }
50 }
51 return TEST_OK;
52}
53
54static int do_test(struct perf_evlist *evlist, int mmap_pages,
55 int *sample_count, int *comm_count)
56{
57 int err;
58 char sbuf[STRERR_BUFSIZE];
59
60 err = perf_evlist__mmap(evlist, mmap_pages, true);
61 if (err < 0) {
62 pr_debug("perf_evlist__mmap: %s\n",
63 str_error_r(errno, sbuf, sizeof(sbuf)));
64 return TEST_FAIL;
65 }
66
67 perf_evlist__enable(evlist);
68 testcase();
69 perf_evlist__disable(evlist);
70
71 err = count_samples(evlist, sample_count, comm_count);
72 perf_evlist__munmap(evlist);
73 return err;
74}
75
76
77int test__backward_ring_buffer(int subtest __maybe_unused)
78{
79 int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
80 char pid[16], sbuf[STRERR_BUFSIZE];
81 struct perf_evlist *evlist;
82 struct perf_evsel *evsel __maybe_unused;
83 struct parse_events_error parse_error;
84 struct record_opts opts = {
85 .target = {
86 .uid = UINT_MAX,
87 .uses_mmap = true,
88 },
89 .freq = 0,
90 .mmap_pages = 256,
91 .default_interval = 1,
92 };
93
94 snprintf(pid, sizeof(pid), "%d", getpid());
95 pid[sizeof(pid) - 1] = '\0';
96 opts.target.tid = opts.target.pid = pid;
97
98 evlist = perf_evlist__new();
99 if (!evlist) {
100 pr_debug("Not enough memory to create evlist\n");
101 return TEST_FAIL;
102 }
103
104 err = perf_evlist__create_maps(evlist, &opts.target);
105 if (err < 0) {
106 pr_debug("Not enough memory to create thread/cpu maps\n");
107 goto out_delete_evlist;
108 }
109
110 bzero(&parse_error, sizeof(parse_error));
111 /*
112 * Set backward bit, ring buffer should be writing from end. Record
113 * it in aux evlist
114 */
115 err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);
116 if (err) {
117 pr_debug("Failed to parse tracepoint event, try use root\n");
118 ret = TEST_SKIP;
119 goto out_delete_evlist;
120 }
121
122 perf_evlist__config(evlist, &opts, NULL);
123
124 err = perf_evlist__open(evlist);
125 if (err < 0) {
126 pr_debug("perf_evlist__open: %s\n",
127 str_error_r(errno, sbuf, sizeof(sbuf)));
128 goto out_delete_evlist;
129 }
130
131 ret = TEST_FAIL;
132 err = do_test(evlist, opts.mmap_pages, &sample_count,
133 &comm_count);
134 if (err != TEST_OK)
135 goto out_delete_evlist;
136
137 if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
138 pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
139 sample_count, comm_count);
140 goto out_delete_evlist;
141 }
142
143 err = do_test(evlist, 1, &sample_count, &comm_count);
144 if (err != TEST_OK)
145 goto out_delete_evlist;
146
147 ret = TEST_OK;
148out_delete_evlist:
149 perf_evlist__delete(evlist);
150 return ret;
151}