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read_result.c
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read_result.c
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/**
* Copyright (C) 2018 Jiajie Chen
*
* This file is part of hll_ebpf.
*
* hll_ebpf is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* hll_ebpf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with hll_ebpf. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/bpf.h>
#include <linux/bpf_common.h>
#include <sys/sysinfo.h>
#define _GNU_SOURCE
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
// Adapted from
// https://elixir.bootlin.com/linux/v4.9/source/samples/bpf/libbpf.c
// and its later versions
#define __NR_bpf 321
static inline __u64 ptr_to_u64(const void *ptr) {
return (__u64)(unsigned long)ptr;
}
static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
unsigned int size) {
return syscall(SYS_bpf, cmd, attr, size);
}
int bpf_obj_get(const char *pathname) {
union bpf_attr attr;
memset(&attr, 0, sizeof(attr));
attr.pathname = ptr_to_u64((void *)pathname);
return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
}
int bpf_map_lookup_elem(int fd, const void *key, void *value) {
union bpf_attr attr;
bzero(&attr, sizeof(attr));
attr.map_fd = fd;
attr.key = ptr_to_u64(key);
attr.value = ptr_to_u64(value);
return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
}
int bpf_map_update_elem(int fd, void *key, void *value,
unsigned long long flags) {
union bpf_attr attr = {
.map_fd = fd,
.key = ptr_to_u64(key),
.value = ptr_to_u64(value),
.flags = flags,
};
return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
}
const static int b = 6;
const static int m = 1 << b;
void clear_file(const char *file) {
int fd = bpf_obj_get(file);
if (fd < 0) {
perror("Failed to clear counters");
exit(1);
}
for (unsigned long i = 0; i < m; i++) {
unsigned long value[128] = {0};
bpf_map_update_elem(fd, &i, &value, 0);
}
}
long read_file(const char *file) {
int fd = bpf_obj_get(file);
if (fd < 0) {
perror("Failed to read from bpf");
exit(1);
}
int M[m] = {0};
int V = 0;
double sum = 0;
int nprocs = get_nprocs();
for (unsigned long i = 0; i < m; i++) {
unsigned long value[128] = {0};
bpf_map_lookup_elem(fd, &i, &value);
for (int j = 0; j < nprocs; j++) {
M[i] = M[i] > value[j] ? M[i] : value[j];
}
if (M[i] == 0)
V++;
sum += pow(2, -M[i]);
}
double E = 0.709 * m * m / sum;
if (E <= 5 * m / 2) {
if (V != 0) {
E = m * log(1.0 * m / V);
}
} else if (E > pow(2, 32) / 30) {
E = -pow(2, 32) * log(1 - E / pow(2, 32));
}
return lround(E);
}
void clear_all() {
clear_file("/sys/fs/bpf/tc/globals/hll_ebpf_in_saddr");
clear_file("/sys/fs/bpf/tc/globals/hll_ebpf_out_daddr");
}
void read_all() {
time_t now;
time(&now);
char buf[sizeof "2011-10-08T07:07:09Z"];
strftime(buf, sizeof buf, "%FT%TZ", gmtime(&now));
long in = read_file("/sys/fs/bpf/tc/globals/hll_ebpf_in_saddr"),
out = read_file("/sys/fs/bpf/tc/globals/hll_ebpf_out_daddr");
printf("In: %ld, Out: %ld\n", in, out);
FILE *fp = fopen("hll.log", "a");
if (fp != NULL) {
fprintf(fp, "%s,%ld,%ld\n", buf, in, out);
fclose(fp);
}
}
int main(int argc, char **argv) {
if (argc < 2 || strcmp(argv[1], "read") == 0) {
printf("Reading hll counter (read, write):\n");
read_all();
} else if (argc >= 2 && strcmp(argv[1], "sample") == 0) {
printf("Clearing hll counter.\n");
clear_all();
int time = 10;
if (argc == 3) {
time = atoi(argv[2]);
}
printf("Waiting for %d seconds\n", time);
sleep(time);
printf("Reading hll counter (read, write):\n");
read_all();
} else if (argc >= 2 && strcmp(argv[1], "watch") == 0) {
int time = 10;
if (argc == 3) {
time = atoi(argv[2]);
}
while (1) {
clear_all();
sleep(time);
printf("Reading hll counter (read, write):\n");
read_all();
}
} else {
printf("Usage: read_result [read|sample [nsecs]|watch [nsecs]]\n");
}
return 0;
}