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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | // SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com */ #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 <bpf/bpf.h> #include "bpf_load.h" #include "bpf_util.h" #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; } |