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