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>
20 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
24 static void clear_stats(int fd)
26 unsigned int nr_cpus = bpf_num_possible_cpus();
27 __u64 values[nr_cpus];
30 memset(values, 0, sizeof(values));
31 for (key = 0; key < SLOTS; key++)
32 bpf_map_update_elem(fd, &key, values, BPF_ANY);
35 const char *color[] = {
49 const int num_colors = ARRAY_SIZE(color);
51 const char nocolor[] = "\033[00m";
68 bool full_range = false;
69 bool text_only = false;
71 static void print_banner(void)
74 printf("|1ns |10ns |100ns |1us |10us |100us"
75 " |1ms |10ms |100ms |1s |10s\n");
77 printf("|1us |10us |100us |1ms |10ms "
81 static void print_hist(int fd)
83 unsigned int nr_cpus = bpf_num_possible_cpus();
84 __u64 total_events = 0;
92 for (key = 0; key < SLOTS; key++) {
93 bpf_map_lookup_elem(fd, &key, values);
95 for (i = 0; i < nr_cpus; i++)
98 total_events += value;
103 for (key = full_range ? 0 : 29; key < SLOTS; key++) {
104 int c = num_colors * cnt[key] / (max_cnt + 1);
107 printf("%s", sym[c]);
109 printf("%s %s", color[c], nocolor);
111 printf(" # %lld\n", total_events);
114 int main(int ac, char **argv)
116 struct rlimit r = {1024*1024, RLIM_INFINITY};
120 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
122 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
123 perror("setrlimit(RLIMIT_MEMLOCK)");
127 if (load_bpf_file(filename)) {
128 printf("%s", bpf_log_buf);
132 for (i = 1; i < ac; i++) {
133 if (strcmp(argv[i], "-a") == 0) {
135 } else if (strcmp(argv[i], "-t") == 0) {
137 } else if (strcmp(argv[i], "-h") == 0) {
139 " -a display wider latency range\n"
145 printf(" heatmap of IO latency\n");
147 printf(" %s", sym[num_colors - 1]);
149 printf(" %s %s", color[num_colors - 1], nocolor);
150 printf(" - many events with this latency\n");
153 printf(" %s", sym[0]);
155 printf(" %s %s", color[0], nocolor);
156 printf(" - few events\n");
161 print_hist(map_fd[1]);