/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <unistd.h> #include <stdbool.h> #include <string.h> #include <linux/bpf.h> #include <sys/resource.h> #include "libbpf.h" #include "bpf_load.h" #include "bpf_util.h" #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) #define SLOTS 100 static void clear_stats(int fd) { unsigned int nr_cpus = bpf_num_possible_cpus(); __u64 values[nr_cpus]; __u32 key; memset(values, 0, sizeof(values)); for (key = 0; key < SLOTS; key++) bpf_map_update_elem(fd, &key, values, BPF_ANY); } const char *color[] = { "\033[48;5;255m", "\033[48;5;252m", "\033[48;5;250m", "\033[48;5;248m", "\033[48;5;246m", "\033[48;5;244m", "\033[48;5;242m", "\033[48;5;240m", "\033[48;5;238m", "\033[48;5;236m", "\033[48;5;234m", "\033[48;5;232m", }; const int num_colors = ARRAY_SIZE(color); const char nocolor[] = "\033[00m"; const char *sym[] = { " ", " ", ".", ".", "*", "*", "o", "o", "O", "O", "#", "#", }; bool full_range = false; bool text_only = false; static void print_banner(void) { if (full_range) printf("|1ns |10ns |100ns |1us |10us |100us" " |1ms |10ms |100ms |1s |10s\n"); else printf("|1us |10us |100us |1ms |10ms " "|100ms |1s |10s\n"); } static void print_hist(int fd) { unsigned int nr_cpus = bpf_num_possible_cpus(); __u64 total_events = 0; long values[nr_cpus]; __u64 max_cnt = 0; __u64 cnt[SLOTS]; __u64 value; __u32 key; int i; for (key = 0; key < SLOTS; key++) { bpf_map_lookup_elem(fd, &key, values); value = 0; for (i = 0; i < nr_cpus; i++) value += values[i]; cnt[key] = value; total_events += value; if (value > max_cnt) max_cnt = value; } clear_stats(fd); for (key = full_range ? 0 : 29; key < SLOTS; key++) { int c = num_colors * cnt[key] / (max_cnt + 1); if (text_only) printf("%s", sym[c]); else printf("%s %s", color[c], nocolor); } printf(" # %lld\n", total_events); } int main(int ac, char **argv) { struct rlimit r = {1024*1024, RLIM_INFINITY}; char filename[256]; int i; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (setrlimit(RLIMIT_MEMLOCK, &r)) { perror("setrlimit(RLIMIT_MEMLOCK)"); return 1; } if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } for (i = 1; i < ac; i++) { if (strcmp(argv[i], "-a") == 0) { full_range = true; } else if (strcmp(argv[i], "-t") == 0) { text_only = true; } else if (strcmp(argv[i], "-h") == 0) { printf("Usage:\n" " -a display wider latency range\n" " -t text only\n"); return 1; } } printf(" heatmap of IO latency\n"); if (text_only) printf(" %s", sym[num_colors - 1]); else printf(" %s %s", color[num_colors - 1], nocolor); printf(" - many events with this latency\n"); if (text_only) printf(" %s", sym[0]); else printf(" %s %s", color[0], nocolor); printf(" - few events\n"); for (i = 0; ; i++) { if (i % 20 == 0) print_banner(); print_hist(map_fd[1]); sleep(2); } return 0; }