Commit | Line | Data |
---|---|---|
5c7fc2d2 AS |
1 | /* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com |
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 <stdlib.h> | |
9 | #include <signal.h> | |
10 | #include <unistd.h> | |
11 | #include <stdbool.h> | |
12 | #include <string.h> | |
13 | #include <linux/bpf.h> | |
14 | #include "libbpf.h" | |
15 | #include "bpf_load.h" | |
16 | ||
17 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) | |
18 | ||
19 | #define SLOTS 100 | |
20 | ||
21 | static void clear_stats(int fd) | |
22 | { | |
23 | __u32 key; | |
24 | __u64 value = 0; | |
25 | ||
26 | for (key = 0; key < SLOTS; key++) | |
27 | bpf_update_elem(fd, &key, &value, BPF_ANY); | |
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 | { | |
78 | __u32 key; | |
79 | __u64 value; | |
80 | __u64 cnt[SLOTS]; | |
81 | __u64 max_cnt = 0; | |
82 | __u64 total_events = 0; | |
83 | ||
84 | for (key = 0; key < SLOTS; key++) { | |
85 | value = 0; | |
86 | bpf_lookup_elem(fd, &key, &value); | |
87 | cnt[key] = value; | |
88 | total_events += value; | |
89 | if (value > max_cnt) | |
90 | max_cnt = value; | |
91 | } | |
92 | clear_stats(fd); | |
93 | for (key = full_range ? 0 : 29; key < SLOTS; key++) { | |
94 | int c = num_colors * cnt[key] / (max_cnt + 1); | |
95 | ||
96 | if (text_only) | |
97 | printf("%s", sym[c]); | |
98 | else | |
99 | printf("%s %s", color[c], nocolor); | |
100 | } | |
101 | printf(" # %lld\n", total_events); | |
102 | } | |
103 | ||
104 | int main(int ac, char **argv) | |
105 | { | |
106 | char filename[256]; | |
107 | int i; | |
108 | ||
109 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
110 | ||
111 | if (load_bpf_file(filename)) { | |
112 | printf("%s", bpf_log_buf); | |
113 | return 1; | |
114 | } | |
115 | ||
116 | for (i = 1; i < ac; i++) { | |
117 | if (strcmp(argv[i], "-a") == 0) { | |
118 | full_range = true; | |
119 | } else if (strcmp(argv[i], "-t") == 0) { | |
120 | text_only = true; | |
121 | } else if (strcmp(argv[i], "-h") == 0) { | |
122 | printf("Usage:\n" | |
123 | " -a display wider latency range\n" | |
124 | " -t text only\n"); | |
125 | return 1; | |
126 | } | |
127 | } | |
128 | ||
129 | printf(" heatmap of IO latency\n"); | |
130 | if (text_only) | |
131 | printf(" %s", sym[num_colors - 1]); | |
132 | else | |
133 | printf(" %s %s", color[num_colors - 1], nocolor); | |
134 | printf(" - many events with this latency\n"); | |
135 | ||
136 | if (text_only) | |
137 | printf(" %s", sym[0]); | |
138 | else | |
139 | printf(" %s %s", color[0], nocolor); | |
140 | printf(" - few events\n"); | |
141 | ||
142 | for (i = 0; ; i++) { | |
143 | if (i % 20 == 0) | |
144 | print_banner(); | |
145 | print_hist(map_fd[1]); | |
146 | sleep(2); | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } |