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