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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> | |
10 | #include <linux/bpf.h> | |
55de1703 | 11 | #include <sys/resource.h> |
e00c7b21 | 12 | |
2bf3e2ef | 13 | #include <bpf/bpf.h> |
5c7fc2d2 | 14 | #include "bpf_load.h" |
e00c7b21 | 15 | #include "bpf_util.h" |
5c7fc2d2 | 16 | |
5c7fc2d2 AS |
17 | #define SLOTS 100 |
18 | ||
19 | static void clear_stats(int fd) | |
20 | { | |
e00c7b21 | 21 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
3059303f | 22 | __u64 values[nr_cpus]; |
5c7fc2d2 | 23 | __u32 key; |
5c7fc2d2 | 24 | |
3059303f | 25 | memset(values, 0, sizeof(values)); |
5c7fc2d2 | 26 | for (key = 0; key < SLOTS; key++) |
d40fc181 | 27 | bpf_map_update_elem(fd, &key, values, BPF_ANY); |
5c7fc2d2 AS |
28 | } |
29 | ||
30 | const char *color[] = { | |
31 | "\033[48;5;255m", | |
32 | "\033[48;5;252m", | |
33 | "\033[48;5;250m", | |
34 | "\033[48;5;248m", | |
35 | "\033[48;5;246m", | |
36 | "\033[48;5;244m", | |
37 | "\033[48;5;242m", | |
38 | "\033[48;5;240m", | |
39 | "\033[48;5;238m", | |
40 | "\033[48;5;236m", | |
41 | "\033[48;5;234m", | |
42 | "\033[48;5;232m", | |
43 | }; | |
44 | const int num_colors = ARRAY_SIZE(color); | |
45 | ||
46 | const char nocolor[] = "\033[00m"; | |
47 | ||
48 | const char *sym[] = { | |
49 | " ", | |
50 | " ", | |
51 | ".", | |
52 | ".", | |
53 | "*", | |
54 | "*", | |
55 | "o", | |
56 | "o", | |
57 | "O", | |
58 | "O", | |
59 | "#", | |
60 | "#", | |
61 | }; | |
62 | ||
63 | bool full_range = false; | |
64 | bool text_only = false; | |
65 | ||
66 | static void print_banner(void) | |
67 | { | |
68 | if (full_range) | |
69 | printf("|1ns |10ns |100ns |1us |10us |100us" | |
70 | " |1ms |10ms |100ms |1s |10s\n"); | |
71 | else | |
72 | printf("|1us |10us |100us |1ms |10ms " | |
73 | "|100ms |1s |10s\n"); | |
74 | } | |
75 | ||
76 | static void print_hist(int fd) | |
77 | { | |
e00c7b21 | 78 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
5c7fc2d2 | 79 | __u64 total_events = 0; |
3059303f AS |
80 | long values[nr_cpus]; |
81 | __u64 max_cnt = 0; | |
82 | __u64 cnt[SLOTS]; | |
83 | __u64 value; | |
84 | __u32 key; | |
85 | int i; | |
5c7fc2d2 AS |
86 | |
87 | for (key = 0; key < SLOTS; key++) { | |
d40fc181 | 88 | bpf_map_lookup_elem(fd, &key, values); |
5c7fc2d2 | 89 | value = 0; |
3059303f AS |
90 | for (i = 0; i < nr_cpus; i++) |
91 | value += values[i]; | |
5c7fc2d2 AS |
92 | cnt[key] = value; |
93 | total_events += value; | |
94 | if (value > max_cnt) | |
95 | max_cnt = value; | |
96 | } | |
97 | clear_stats(fd); | |
98 | for (key = full_range ? 0 : 29; key < SLOTS; key++) { | |
99 | int c = num_colors * cnt[key] / (max_cnt + 1); | |
100 | ||
101 | if (text_only) | |
102 | printf("%s", sym[c]); | |
103 | else | |
104 | printf("%s %s", color[c], nocolor); | |
105 | } | |
106 | printf(" # %lld\n", total_events); | |
107 | } | |
108 | ||
109 | int main(int ac, char **argv) | |
110 | { | |
55de1703 | 111 | struct rlimit r = {1024*1024, RLIM_INFINITY}; |
5c7fc2d2 AS |
112 | char filename[256]; |
113 | int i; | |
114 | ||
115 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
116 | ||
55de1703 JDB |
117 | if (setrlimit(RLIMIT_MEMLOCK, &r)) { |
118 | perror("setrlimit(RLIMIT_MEMLOCK)"); | |
119 | return 1; | |
120 | } | |
121 | ||
5c7fc2d2 AS |
122 | if (load_bpf_file(filename)) { |
123 | printf("%s", bpf_log_buf); | |
124 | return 1; | |
125 | } | |
126 | ||
127 | for (i = 1; i < ac; i++) { | |
128 | if (strcmp(argv[i], "-a") == 0) { | |
129 | full_range = true; | |
130 | } else if (strcmp(argv[i], "-t") == 0) { | |
131 | text_only = true; | |
132 | } else if (strcmp(argv[i], "-h") == 0) { | |
133 | printf("Usage:\n" | |
134 | " -a display wider latency range\n" | |
135 | " -t text only\n"); | |
136 | return 1; | |
137 | } | |
138 | } | |
139 | ||
140 | printf(" heatmap of IO latency\n"); | |
141 | if (text_only) | |
142 | printf(" %s", sym[num_colors - 1]); | |
143 | else | |
144 | printf(" %s %s", color[num_colors - 1], nocolor); | |
145 | printf(" - many events with this latency\n"); | |
146 | ||
147 | if (text_only) | |
148 | printf(" %s", sym[0]); | |
149 | else | |
150 | printf(" %s %s", color[0], nocolor); | |
151 | printf(" - few events\n"); | |
152 | ||
153 | for (i = 0; ; i++) { | |
154 | if (i % 20 == 0) | |
155 | print_banner(); | |
156 | print_hist(map_fd[1]); | |
157 | sleep(2); | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } |