1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc. */
/* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <errno.h>
#include <fcntl.h>
#include <libbpf.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <linux/bpf.h>
#include <linux/perf_event.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <bpf.h>
#include <perf-sys.h>
#include "main.h"
#define MMAP_PAGE_CNT 16
static volatile bool stop;
struct event_ring_info {
int fd;
int key;
unsigned int cpu;
void *mem;
};
struct perf_event_sample {
struct perf_event_header header;
u64 time;
__u32 size;
unsigned char data[];
};
struct perf_event_lost {
struct perf_event_header header;
__u64 id;
__u64 lost;
};
static void int_exit(int signo)
{
fprintf(stderr, "Stopping...\n");
stop = true;
}
struct event_pipe_ctx {
bool all_cpus;
int cpu;
int idx;
};
static enum bpf_perf_event_ret
print_bpf_output(void *private_data, int cpu, struct perf_event_header *event)
{
struct perf_event_sample *e = container_of(event,
struct perf_event_sample,
header);
struct perf_event_lost *lost = container_of(event,
struct perf_event_lost,
header);
struct event_pipe_ctx *ctx = private_data;
int idx = ctx->all_cpus ? cpu : ctx->idx;
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "type");
jsonw_uint(json_wtr, e->header.type);
jsonw_name(json_wtr, "cpu");
jsonw_uint(json_wtr, cpu);
jsonw_name(json_wtr, "index");
jsonw_uint(json_wtr, idx);
if (e->header.type == PERF_RECORD_SAMPLE) {
jsonw_name(json_wtr, "timestamp");
jsonw_uint(json_wtr, e->time);
jsonw_name(json_wtr, "data");
print_data_json(e->data, e->size);
} else if (e->header.type == PERF_RECORD_LOST) {
jsonw_name(json_wtr, "lost");
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "id");
jsonw_uint(json_wtr, lost->id);
jsonw_name(json_wtr, "count");
jsonw_uint(json_wtr, lost->lost);
jsonw_end_object(json_wtr);
}
jsonw_end_object(json_wtr);
} else {
if (e->header.type == PERF_RECORD_SAMPLE) {
printf("== @%lld.%09lld CPU: %d index: %d =====\n",
e->time / 1000000000ULL, e->time % 1000000000ULL,
cpu, idx);
fprint_hex(stdout, e->data, e->size, " ");
printf("\n");
} else if (e->header.type == PERF_RECORD_LOST) {
printf("lost %lld events\n", lost->lost);
} else {
printf("unknown event type=%d size=%d\n",
e->header.type, e->header.size);
}
}
return LIBBPF_PERF_EVENT_CONT;
}
int do_event_pipe(int argc, char **argv)
{
struct perf_event_attr perf_attr = {
.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME,
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_BPF_OUTPUT,
.sample_period = 1,
.wakeup_events = 1,
};
struct bpf_map_info map_info = {};
struct perf_buffer_raw_opts opts = {};
struct event_pipe_ctx ctx = {
.all_cpus = true,
.cpu = -1,
.idx = -1,
};
struct perf_buffer *pb;
__u32 map_info_len;
int err, map_fd;
map_info_len = sizeof(map_info);
map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len);
if (map_fd < 0)
return -1;
if (map_info.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
p_err("map is not a perf event array");
goto err_close_map;
}
while (argc) {
if (argc < 2) {
BAD_ARG();
goto err_close_map;
}
if (is_prefix(*argv, "cpu")) {
char *endptr;
NEXT_ARG();
ctx.cpu = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as CPU ID", **argv);
goto err_close_map;
}
NEXT_ARG();
} else if (is_prefix(*argv, "index")) {
char *endptr;
NEXT_ARG();
ctx.idx = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as index", **argv);
goto err_close_map;
}
NEXT_ARG();
} else {
BAD_ARG();
goto err_close_map;
}
ctx.all_cpus = false;
}
if (!ctx.all_cpus) {
if (ctx.idx == -1 || ctx.cpu == -1) {
p_err("cpu and index must be specified together");
goto err_close_map;
}
} else {
ctx.cpu = 0;
ctx.idx = 0;
}
opts.attr = &perf_attr;
opts.event_cb = print_bpf_output;
opts.ctx = &ctx;
opts.cpu_cnt = ctx.all_cpus ? 0 : 1;
opts.cpus = &ctx.cpu;
opts.map_keys = &ctx.idx;
pb = perf_buffer__new_raw(map_fd, MMAP_PAGE_CNT, &opts);
err = libbpf_get_error(pb);
if (err) {
p_err("failed to create perf buffer: %s (%d)",
strerror(err), err);
goto err_close_map;
}
signal(SIGINT, int_exit);
signal(SIGHUP, int_exit);
signal(SIGTERM, int_exit);
if (json_output)
jsonw_start_array(json_wtr);
while (!stop) {
err = perf_buffer__poll(pb, 200);
if (err < 0 && err != -EINTR) {
p_err("perf buffer polling failed: %s (%d)",
strerror(err), err);
goto err_close_pb;
}
}
if (json_output)
jsonw_end_array(json_wtr);
perf_buffer__free(pb);
close(map_fd);
return 0;
err_close_pb:
perf_buffer__free(pb);
err_close_map:
close(map_fd);
return -1;
}
|
