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