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