165 lines
3.2 KiB
C
165 lines
3.2 KiB
C
/* 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 <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;
|
|
}
|