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a6ffe7b9 AS |
1 | /* Copyright (c) 2016 Facebook |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #include <stdio.h> | |
8 | #include <unistd.h> | |
9 | #include <stdlib.h> | |
10 | #include <signal.h> | |
11 | #include <linux/bpf.h> | |
12 | #include <string.h> | |
13 | #include <linux/perf_event.h> | |
14 | #include <errno.h> | |
15 | #include <assert.h> | |
16 | #include <stdbool.h> | |
17 | #include <sys/resource.h> | |
18 | #include "libbpf.h" | |
19 | #include "bpf_load.h" | |
20 | ||
a6ffe7b9 AS |
21 | #define PRINT_RAW_ADDR 0 |
22 | ||
a6ffe7b9 AS |
23 | static void print_ksym(__u64 addr) |
24 | { | |
25 | struct ksym *sym; | |
26 | ||
27 | if (!addr) | |
28 | return; | |
3622e7e4 | 29 | sym = ksym_search(addr); |
a6ffe7b9 AS |
30 | if (PRINT_RAW_ADDR) |
31 | printf("%s/%llx;", sym->name, addr); | |
32 | else | |
33 | printf("%s;", sym->name); | |
34 | } | |
35 | ||
36 | #define TASK_COMM_LEN 16 | |
37 | ||
38 | struct key_t { | |
39 | char waker[TASK_COMM_LEN]; | |
40 | char target[TASK_COMM_LEN]; | |
41 | __u32 wret; | |
42 | __u32 tret; | |
43 | }; | |
44 | ||
45 | static void print_stack(struct key_t *key, __u64 count) | |
46 | { | |
47 | __u64 ip[PERF_MAX_STACK_DEPTH] = {}; | |
48 | static bool warned; | |
49 | int i; | |
50 | ||
51 | printf("%s;", key->target); | |
52 | if (bpf_lookup_elem(map_fd[3], &key->tret, ip) != 0) { | |
53 | printf("---;"); | |
54 | } else { | |
55 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
56 | print_ksym(ip[i]); | |
57 | } | |
58 | printf("-;"); | |
59 | if (bpf_lookup_elem(map_fd[3], &key->wret, ip) != 0) { | |
60 | printf("---;"); | |
61 | } else { | |
62 | for (i = 0; i < PERF_MAX_STACK_DEPTH; i++) | |
63 | print_ksym(ip[i]); | |
64 | } | |
65 | printf(";%s %lld\n", key->waker, count); | |
66 | ||
67 | if ((key->tret == -EEXIST || key->wret == -EEXIST) && !warned) { | |
68 | printf("stackmap collisions seen. Consider increasing size\n"); | |
69 | warned = true; | |
70 | } else if (((int)(key->tret) < 0 || (int)(key->wret) < 0)) { | |
71 | printf("err stackid %d %d\n", key->tret, key->wret); | |
72 | } | |
73 | } | |
74 | ||
75 | static void print_stacks(int fd) | |
76 | { | |
77 | struct key_t key = {}, next_key; | |
78 | __u64 value; | |
79 | ||
80 | while (bpf_get_next_key(fd, &key, &next_key) == 0) { | |
81 | bpf_lookup_elem(fd, &next_key, &value); | |
82 | print_stack(&next_key, value); | |
83 | key = next_key; | |
84 | } | |
85 | } | |
86 | ||
87 | static void int_exit(int sig) | |
88 | { | |
89 | print_stacks(map_fd[0]); | |
90 | exit(0); | |
91 | } | |
92 | ||
93 | int main(int argc, char **argv) | |
94 | { | |
95 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; | |
96 | char filename[256]; | |
97 | int delay = 1; | |
98 | ||
99 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
100 | setrlimit(RLIMIT_MEMLOCK, &r); | |
101 | ||
102 | signal(SIGINT, int_exit); | |
103 | ||
104 | if (load_kallsyms()) { | |
105 | printf("failed to process /proc/kallsyms\n"); | |
106 | return 2; | |
107 | } | |
108 | ||
109 | if (load_bpf_file(filename)) { | |
110 | printf("%s", bpf_log_buf); | |
111 | return 1; | |
112 | } | |
113 | ||
114 | if (argc > 1) | |
115 | delay = atoi(argv[1]); | |
116 | sleep(delay); | |
117 | print_stacks(map_fd[0]); | |
118 | ||
119 | return 0; | |
120 | } |