cregit-Linux how code gets into the kernel

Release 4.7 samples/bpf/tracex3_user.c

Directory: samples/bpf
/* 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 "libbpf.h"
#include "bpf_load.h"


#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))


#define SLOTS 100


static void clear_stats(int fd) { unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF); __u64 values[nr_cpus]; __u32 key; memset(values, 0, sizeof(values)); for (key = 0; key < SLOTS; key++) bpf_update_elem(fd, &key, values, BPF_ANY); }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov64100.00%2100.00%
Total64100.00%2100.00%

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"); }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov25100.00%1100.00%
Total25100.00%1100.00%


static void print_hist(int fd) { unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF); __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_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); }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov193100.00%2100.00%
Total193100.00%2100.00%


int main(int ac, char **argv) { char filename[256]; int i; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 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; }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov253100.00%1100.00%
Total253100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov664100.00%2100.00%
Total664100.00%2100.00%
Directory: samples/bpf
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