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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
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
11#include <bpf/bpf.h>
12#include <bpf/libbpf.h>
13#include "bpf_util.h"
14
15#define SLOTS 100
16
17static void clear_stats(int fd)
18{
19 unsigned int nr_cpus = bpf_num_possible_cpus();
20 __u64 values[nr_cpus];
21 __u32 key;
22
23 memset(values, 0, sizeof(values));
24 for (key = 0; key < SLOTS; key++)
25 bpf_map_update_elem(fd, &key, values, BPF_ANY);
26}
27
28const char *color[] = {
29 "\033[48;5;255m",
30 "\033[48;5;252m",
31 "\033[48;5;250m",
32 "\033[48;5;248m",
33 "\033[48;5;246m",
34 "\033[48;5;244m",
35 "\033[48;5;242m",
36 "\033[48;5;240m",
37 "\033[48;5;238m",
38 "\033[48;5;236m",
39 "\033[48;5;234m",
40 "\033[48;5;232m",
41};
42const int num_colors = ARRAY_SIZE(color);
43
44const char nocolor[] = "\033[00m";
45
46const char *sym[] = {
47 " ",
48 " ",
49 ".",
50 ".",
51 "*",
52 "*",
53 "o",
54 "o",
55 "O",
56 "O",
57 "#",
58 "#",
59};
60
61bool full_range = false;
62bool text_only = false;
63
64static void print_banner(void)
65{
66 if (full_range)
67 printf("|1ns |10ns |100ns |1us |10us |100us"
68 " |1ms |10ms |100ms |1s |10s\n");
69 else
70 printf("|1us |10us |100us |1ms |10ms "
71 "|100ms |1s |10s\n");
72}
73
74static void print_hist(int fd)
75{
76 unsigned int nr_cpus = bpf_num_possible_cpus();
77 __u64 total_events = 0;
78 long values[nr_cpus];
79 __u64 max_cnt = 0;
80 __u64 cnt[SLOTS];
81 __u64 value;
82 __u32 key;
83 int i;
84
85 for (key = 0; key < SLOTS; key++) {
86 bpf_map_lookup_elem(fd, &key, values);
87 value = 0;
88 for (i = 0; i < nr_cpus; i++)
89 value += values[i];
90 cnt[key] = value;
91 total_events += value;
92 if (value > max_cnt)
93 max_cnt = value;
94 }
95 clear_stats(fd);
96 for (key = full_range ? 0 : 29; key < SLOTS; key++) {
97 int c = num_colors * cnt[key] / (max_cnt + 1);
98
99 if (text_only)
100 printf("%s", sym[c]);
101 else
102 printf("%s %s", color[c], nocolor);
103 }
104 printf(" # %lld\n", total_events);
105}
106
107int main(int ac, char **argv)
108{
109 struct bpf_link *links[2];
110 struct bpf_program *prog;
111 struct bpf_object *obj;
112 char filename[256];
113 int map_fd, i, j = 0;
114
115 for (i = 1; i < ac; i++) {
116 if (strcmp(argv[i], "-a") == 0) {
117 full_range = true;
118 } else if (strcmp(argv[i], "-t") == 0) {
119 text_only = true;
120 } else if (strcmp(argv[i], "-h") == 0) {
121 printf("Usage:\n"
122 " -a display wider latency range\n"
123 " -t text only\n");
124 return 1;
125 }
126 }
127
128 snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
129 obj = bpf_object__open_file(filename, NULL);
130 if (libbpf_get_error(obj)) {
131 fprintf(stderr, "ERROR: opening BPF object file failed\n");
132 return 0;
133 }
134
135 /* load BPF program */
136 if (bpf_object__load(obj)) {
137 fprintf(stderr, "ERROR: loading BPF object file failed\n");
138 goto cleanup;
139 }
140
141 map_fd = bpf_object__find_map_fd_by_name(obj, "lat_map");
142 if (map_fd < 0) {
143 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
144 goto cleanup;
145 }
146
147 bpf_object__for_each_program(prog, obj) {
148 links[j] = bpf_program__attach(prog);
149 if (libbpf_get_error(links[j])) {
150 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
151 links[j] = NULL;
152 goto cleanup;
153 }
154 j++;
155 }
156
157 printf(" heatmap of IO latency\n");
158 if (text_only)
159 printf(" %s", sym[num_colors - 1]);
160 else
161 printf(" %s %s", color[num_colors - 1], nocolor);
162 printf(" - many events with this latency\n");
163
164 if (text_only)
165 printf(" %s", sym[0]);
166 else
167 printf(" %s %s", color[0], nocolor);
168 printf(" - few events\n");
169
170 for (i = 0; ; i++) {
171 if (i % 20 == 0)
172 print_banner();
173 print_hist(map_fd);
174 sleep(2);
175 }
176
177cleanup:
178 for (j--; j >= 0; j--)
179 bpf_link__destroy(links[j]);
180
181 bpf_object__close(obj);
182 return 0;
183}
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
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 <sys/resource.h>
11
12#include <bpf/bpf.h>
13#include <bpf/libbpf.h>
14#include "bpf_util.h"
15
16#define SLOTS 100
17
18static void clear_stats(int fd)
19{
20 unsigned int nr_cpus = bpf_num_possible_cpus();
21 __u64 values[nr_cpus];
22 __u32 key;
23
24 memset(values, 0, sizeof(values));
25 for (key = 0; key < SLOTS; key++)
26 bpf_map_update_elem(fd, &key, values, BPF_ANY);
27}
28
29const char *color[] = {
30 "\033[48;5;255m",
31 "\033[48;5;252m",
32 "\033[48;5;250m",
33 "\033[48;5;248m",
34 "\033[48;5;246m",
35 "\033[48;5;244m",
36 "\033[48;5;242m",
37 "\033[48;5;240m",
38 "\033[48;5;238m",
39 "\033[48;5;236m",
40 "\033[48;5;234m",
41 "\033[48;5;232m",
42};
43const int num_colors = ARRAY_SIZE(color);
44
45const char nocolor[] = "\033[00m";
46
47const char *sym[] = {
48 " ",
49 " ",
50 ".",
51 ".",
52 "*",
53 "*",
54 "o",
55 "o",
56 "O",
57 "O",
58 "#",
59 "#",
60};
61
62bool full_range = false;
63bool text_only = false;
64
65static void print_banner(void)
66{
67 if (full_range)
68 printf("|1ns |10ns |100ns |1us |10us |100us"
69 " |1ms |10ms |100ms |1s |10s\n");
70 else
71 printf("|1us |10us |100us |1ms |10ms "
72 "|100ms |1s |10s\n");
73}
74
75static void print_hist(int fd)
76{
77 unsigned int nr_cpus = bpf_num_possible_cpus();
78 __u64 total_events = 0;
79 long values[nr_cpus];
80 __u64 max_cnt = 0;
81 __u64 cnt[SLOTS];
82 __u64 value;
83 __u32 key;
84 int i;
85
86 for (key = 0; key < SLOTS; key++) {
87 bpf_map_lookup_elem(fd, &key, values);
88 value = 0;
89 for (i = 0; i < nr_cpus; i++)
90 value += values[i];
91 cnt[key] = value;
92 total_events += value;
93 if (value > max_cnt)
94 max_cnt = value;
95 }
96 clear_stats(fd);
97 for (key = full_range ? 0 : 29; key < SLOTS; key++) {
98 int c = num_colors * cnt[key] / (max_cnt + 1);
99
100 if (text_only)
101 printf("%s", sym[c]);
102 else
103 printf("%s %s", color[c], nocolor);
104 }
105 printf(" # %lld\n", total_events);
106}
107
108int main(int ac, char **argv)
109{
110 struct rlimit r = {1024*1024, RLIM_INFINITY};
111 struct bpf_link *links[2];
112 struct bpf_program *prog;
113 struct bpf_object *obj;
114 char filename[256];
115 int map_fd, i, j = 0;
116
117 for (i = 1; i < ac; i++) {
118 if (strcmp(argv[i], "-a") == 0) {
119 full_range = true;
120 } else if (strcmp(argv[i], "-t") == 0) {
121 text_only = true;
122 } else if (strcmp(argv[i], "-h") == 0) {
123 printf("Usage:\n"
124 " -a display wider latency range\n"
125 " -t text only\n");
126 return 1;
127 }
128 }
129
130 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
131 perror("setrlimit(RLIMIT_MEMLOCK)");
132 return 1;
133 }
134
135 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
136 obj = bpf_object__open_file(filename, NULL);
137 if (libbpf_get_error(obj)) {
138 fprintf(stderr, "ERROR: opening BPF object file failed\n");
139 return 0;
140 }
141
142 /* load BPF program */
143 if (bpf_object__load(obj)) {
144 fprintf(stderr, "ERROR: loading BPF object file failed\n");
145 goto cleanup;
146 }
147
148 map_fd = bpf_object__find_map_fd_by_name(obj, "lat_map");
149 if (map_fd < 0) {
150 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
151 goto cleanup;
152 }
153
154 bpf_object__for_each_program(prog, obj) {
155 links[j] = bpf_program__attach(prog);
156 if (libbpf_get_error(links[j])) {
157 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
158 links[j] = NULL;
159 goto cleanup;
160 }
161 j++;
162 }
163
164 printf(" heatmap of IO latency\n");
165 if (text_only)
166 printf(" %s", sym[num_colors - 1]);
167 else
168 printf(" %s %s", color[num_colors - 1], nocolor);
169 printf(" - many events with this latency\n");
170
171 if (text_only)
172 printf(" %s", sym[0]);
173 else
174 printf(" %s %s", color[0], nocolor);
175 printf(" - few events\n");
176
177 for (i = 0; ; i++) {
178 if (i % 20 == 0)
179 print_banner();
180 print_hist(map_fd);
181 sleep(2);
182 }
183
184cleanup:
185 for (j--; j >= 0; j--)
186 bpf_link__destroy(links[j]);
187
188 bpf_object__close(obj);
189 return 0;
190}