blob: 0aaa933ab93818df1634ba170e125e65dc6031d5 [file] [log] [blame]
Alexei Starovoitov5c7fc2d2015-03-25 12:49:25 -07001/* 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
21static 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
30const 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};
44const int num_colors = ARRAY_SIZE(color);
45
46const char nocolor[] = "\033[00m";
47
48const char *sym[] = {
49 " ",
50 " ",
51 ".",
52 ".",
53 "*",
54 "*",
55 "o",
56 "o",
57 "O",
58 "O",
59 "#",
60 "#",
61};
62
63bool full_range = false;
64bool text_only = false;
65
66static 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
76static 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
104int 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}