forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
184 lines
3.7 KiB
184 lines
3.7 KiB
// 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 <sys/resource.h> |
|
|
|
#include <bpf/bpf.h> |
|
#include <bpf/libbpf.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 bpf_link *links[2]; |
|
struct bpf_program *prog; |
|
struct bpf_object *obj; |
|
char filename[256]; |
|
int map_fd, i, j = 0; |
|
|
|
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; |
|
} |
|
} |
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
|
obj = bpf_object__open_file(filename, NULL); |
|
if (libbpf_get_error(obj)) { |
|
fprintf(stderr, "ERROR: opening BPF object file failed\n"); |
|
return 0; |
|
} |
|
|
|
/* load BPF program */ |
|
if (bpf_object__load(obj)) { |
|
fprintf(stderr, "ERROR: loading BPF object file failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
map_fd = bpf_object__find_map_fd_by_name(obj, "lat_map"); |
|
if (map_fd < 0) { |
|
fprintf(stderr, "ERROR: finding a map in obj file failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
bpf_object__for_each_program(prog, obj) { |
|
links[j] = bpf_program__attach(prog); |
|
if (libbpf_get_error(links[j])) { |
|
fprintf(stderr, "ERROR: bpf_program__attach failed\n"); |
|
links[j] = NULL; |
|
goto cleanup; |
|
} |
|
j++; |
|
} |
|
|
|
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); |
|
sleep(2); |
|
} |
|
|
|
cleanup: |
|
for (j--; j >= 0; j--) |
|
bpf_link__destroy(links[j]); |
|
|
|
bpf_object__close(obj); |
|
return 0; |
|
}
|
|
|