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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5c7fc2d2 | 2 | /* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com |
5c7fc2d2 AS |
3 | */ |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
6 | #include <signal.h> | |
7 | #include <unistd.h> | |
8 | #include <stdbool.h> | |
9 | #include <string.h> | |
e00c7b21 | 10 | |
2bf3e2ef | 11 | #include <bpf/bpf.h> |
63841bc0 | 12 | #include <bpf/libbpf.h> |
e00c7b21 | 13 | #include "bpf_util.h" |
5c7fc2d2 | 14 | |
5c7fc2d2 AS |
15 | #define SLOTS 100 |
16 | ||
17 | static void clear_stats(int fd) | |
18 | { | |
e00c7b21 | 19 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
3059303f | 20 | __u64 values[nr_cpus]; |
5c7fc2d2 | 21 | __u32 key; |
5c7fc2d2 | 22 | |
3059303f | 23 | memset(values, 0, sizeof(values)); |
5c7fc2d2 | 24 | for (key = 0; key < SLOTS; key++) |
d40fc181 | 25 | bpf_map_update_elem(fd, &key, values, BPF_ANY); |
5c7fc2d2 AS |
26 | } |
27 | ||
28 | const char *color[] = { | |
29 | "\033[48;5;255m", | |
30 | "\033[48;5;252m", | |
31 | "\033[48;5;250m", | |
32 | "\033[48;5;248m", | |
33 | "\033[48;5;246m", | |
34 | "\033[48;5;244m", | |
35 | "\033[48;5;242m", | |
36 | "\033[48;5;240m", | |
37 | "\033[48;5;238m", | |
38 | "\033[48;5;236m", | |
39 | "\033[48;5;234m", | |
40 | "\033[48;5;232m", | |
41 | }; | |
42 | const int num_colors = ARRAY_SIZE(color); | |
43 | ||
44 | const char nocolor[] = "\033[00m"; | |
45 | ||
46 | const char *sym[] = { | |
47 | " ", | |
48 | " ", | |
49 | ".", | |
50 | ".", | |
51 | "*", | |
52 | "*", | |
53 | "o", | |
54 | "o", | |
55 | "O", | |
56 | "O", | |
57 | "#", | |
58 | "#", | |
59 | }; | |
60 | ||
61 | bool full_range = false; | |
62 | bool text_only = false; | |
63 | ||
64 | static void print_banner(void) | |
65 | { | |
66 | if (full_range) | |
67 | printf("|1ns |10ns |100ns |1us |10us |100us" | |
68 | " |1ms |10ms |100ms |1s |10s\n"); | |
69 | else | |
70 | printf("|1us |10us |100us |1ms |10ms " | |
71 | "|100ms |1s |10s\n"); | |
72 | } | |
73 | ||
74 | static void print_hist(int fd) | |
75 | { | |
e00c7b21 | 76 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
5c7fc2d2 | 77 | __u64 total_events = 0; |
3059303f AS |
78 | long values[nr_cpus]; |
79 | __u64 max_cnt = 0; | |
80 | __u64 cnt[SLOTS]; | |
81 | __u64 value; | |
82 | __u32 key; | |
83 | int i; | |
5c7fc2d2 AS |
84 | |
85 | for (key = 0; key < SLOTS; key++) { | |
d40fc181 | 86 | bpf_map_lookup_elem(fd, &key, values); |
5c7fc2d2 | 87 | value = 0; |
3059303f AS |
88 | for (i = 0; i < nr_cpus; i++) |
89 | value += values[i]; | |
5c7fc2d2 AS |
90 | cnt[key] = value; |
91 | total_events += value; | |
92 | if (value > max_cnt) | |
93 | max_cnt = value; | |
94 | } | |
95 | clear_stats(fd); | |
96 | for (key = full_range ? 0 : 29; key < SLOTS; key++) { | |
97 | int c = num_colors * cnt[key] / (max_cnt + 1); | |
98 | ||
99 | if (text_only) | |
100 | printf("%s", sym[c]); | |
101 | else | |
102 | printf("%s %s", color[c], nocolor); | |
103 | } | |
104 | printf(" # %lld\n", total_events); | |
105 | } | |
106 | ||
107 | int main(int ac, char **argv) | |
108 | { | |
63841bc0 DL |
109 | struct bpf_link *links[2]; |
110 | struct bpf_program *prog; | |
111 | struct bpf_object *obj; | |
5c7fc2d2 | 112 | char filename[256]; |
63841bc0 | 113 | int map_fd, i, j = 0; |
5c7fc2d2 AS |
114 | |
115 | for (i = 1; i < ac; i++) { | |
116 | if (strcmp(argv[i], "-a") == 0) { | |
117 | full_range = true; | |
118 | } else if (strcmp(argv[i], "-t") == 0) { | |
119 | text_only = true; | |
120 | } else if (strcmp(argv[i], "-h") == 0) { | |
121 | printf("Usage:\n" | |
122 | " -a display wider latency range\n" | |
123 | " -t text only\n"); | |
124 | return 1; | |
125 | } | |
126 | } | |
127 | ||
4a0ee788 | 128 | snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]); |
63841bc0 DL |
129 | obj = bpf_object__open_file(filename, NULL); |
130 | if (libbpf_get_error(obj)) { | |
131 | fprintf(stderr, "ERROR: opening BPF object file failed\n"); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* load BPF program */ | |
136 | if (bpf_object__load(obj)) { | |
137 | fprintf(stderr, "ERROR: loading BPF object file failed\n"); | |
138 | goto cleanup; | |
139 | } | |
140 | ||
141 | map_fd = bpf_object__find_map_fd_by_name(obj, "lat_map"); | |
142 | if (map_fd < 0) { | |
143 | fprintf(stderr, "ERROR: finding a map in obj file failed\n"); | |
144 | goto cleanup; | |
145 | } | |
146 | ||
147 | bpf_object__for_each_program(prog, obj) { | |
148 | links[j] = bpf_program__attach(prog); | |
149 | if (libbpf_get_error(links[j])) { | |
150 | fprintf(stderr, "ERROR: bpf_program__attach failed\n"); | |
151 | links[j] = NULL; | |
152 | goto cleanup; | |
153 | } | |
154 | j++; | |
155 | } | |
156 | ||
5c7fc2d2 AS |
157 | printf(" heatmap of IO latency\n"); |
158 | if (text_only) | |
159 | printf(" %s", sym[num_colors - 1]); | |
160 | else | |
161 | printf(" %s %s", color[num_colors - 1], nocolor); | |
162 | printf(" - many events with this latency\n"); | |
163 | ||
164 | if (text_only) | |
165 | printf(" %s", sym[0]); | |
166 | else | |
167 | printf(" %s %s", color[0], nocolor); | |
168 | printf(" - few events\n"); | |
169 | ||
170 | for (i = 0; ; i++) { | |
171 | if (i % 20 == 0) | |
172 | print_banner(); | |
63841bc0 | 173 | print_hist(map_fd); |
5c7fc2d2 AS |
174 | sleep(2); |
175 | } | |
176 | ||
63841bc0 DL |
177 | cleanup: |
178 | for (j--; j >= 0; j--) | |
179 | bpf_link__destroy(links[j]); | |
180 | ||
181 | bpf_object__close(obj); | |
5c7fc2d2 AS |
182 | return 0; |
183 | } |