1 /* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
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.
13 #include <linux/bpf.h>
17 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
21 static void clear_stats(int fd)
23 unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
24 __u64 values[nr_cpus];
27 memset(values, 0, sizeof(values));
28 for (key = 0; key < SLOTS; key++)
29 bpf_update_elem(fd, &key, values, BPF_ANY);
32 const char *color[] = {
46 const int num_colors = ARRAY_SIZE(color);
48 const char nocolor[] = "\033[00m";
65 bool full_range = false;
66 bool text_only = false;
68 static void print_banner(void)
71 printf("|1ns |10ns |100ns |1us |10us |100us"
72 " |1ms |10ms |100ms |1s |10s\n");
74 printf("|1us |10us |100us |1ms |10ms "
78 static void print_hist(int fd)
80 unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
81 __u64 total_events = 0;
89 for (key = 0; key < SLOTS; key++) {
90 bpf_lookup_elem(fd, &key, values);
92 for (i = 0; i < nr_cpus; i++)
95 total_events += value;
100 for (key = full_range ? 0 : 29; key < SLOTS; key++) {
101 int c = num_colors * cnt[key] / (max_cnt + 1);
104 printf("%s", sym[c]);
106 printf("%s %s", color[c], nocolor);
108 printf(" # %lld\n", total_events);
111 int main(int ac, char **argv)
116 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
118 if (load_bpf_file(filename)) {
119 printf("%s", bpf_log_buf);
123 for (i = 1; i < ac; i++) {
124 if (strcmp(argv[i], "-a") == 0) {
126 } else if (strcmp(argv[i], "-t") == 0) {
128 } else if (strcmp(argv[i], "-h") == 0) {
130 " -a display wider latency range\n"
136 printf(" heatmap of IO latency\n");
138 printf(" %s", sym[num_colors - 1]);
140 printf(" %s %s", color[num_colors - 1], nocolor);
141 printf(" - many events with this latency\n");
144 printf(" %s", sym[0]);
146 printf(" %s %s", color[0], nocolor);
147 printf(" - few events\n");
152 print_hist(map_fd[1]);