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>
14 #include <sys/resource.h>
22 static void clear_stats(int fd)
24 unsigned int nr_cpus = bpf_num_possible_cpus();
25 __u64 values[nr_cpus];
28 memset(values, 0, sizeof(values));
29 for (key = 0; key < SLOTS; key++)
30 bpf_map_update_elem(fd, &key, values, BPF_ANY);
33 const char *color[] = {
47 const int num_colors = ARRAY_SIZE(color);
49 const char nocolor[] = "\033[00m";
66 bool full_range = false;
67 bool text_only = false;
69 static void print_banner(void)
72 printf("|1ns |10ns |100ns |1us |10us |100us"
73 " |1ms |10ms |100ms |1s |10s\n");
75 printf("|1us |10us |100us |1ms |10ms "
79 static void print_hist(int fd)
81 unsigned int nr_cpus = bpf_num_possible_cpus();
82 __u64 total_events = 0;
90 for (key = 0; key < SLOTS; key++) {
91 bpf_map_lookup_elem(fd, &key, values);
93 for (i = 0; i < nr_cpus; i++)
96 total_events += value;
101 for (key = full_range ? 0 : 29; key < SLOTS; key++) {
102 int c = num_colors * cnt[key] / (max_cnt + 1);
105 printf("%s", sym[c]);
107 printf("%s %s", color[c], nocolor);
109 printf(" # %lld\n", total_events);
112 int main(int ac, char **argv)
114 struct rlimit r = {1024*1024, RLIM_INFINITY};
118 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
120 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
121 perror("setrlimit(RLIMIT_MEMLOCK)");
125 if (load_bpf_file(filename)) {
126 printf("%s", bpf_log_buf);
130 for (i = 1; i < ac; i++) {
131 if (strcmp(argv[i], "-a") == 0) {
133 } else if (strcmp(argv[i], "-t") == 0) {
135 } else if (strcmp(argv[i], "-h") == 0) {
137 " -a display wider latency range\n"
143 printf(" heatmap of IO latency\n");
145 printf(" %s", sym[num_colors - 1]);
147 printf(" %s %s", color[num_colors - 1], nocolor);
148 printf(" - many events with this latency\n");
151 printf(" %s", sym[0]);
153 printf(" %s %s", color[0], nocolor);
154 printf(" - few events\n");
159 print_hist(map_fd[1]);