forked from Minki/linux
28dbf861de
There is no functionality change in this patch. The common-purpose trace functions, including perf_event polling and ksym lookup, are moved from trace_output_user.c and bpf_load.c to selftests/bpf/trace_helpers.c so that these function can be reused later in selftests. Acked-by: Alexei Starovoitov <ast@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
/* 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 <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <poll.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/bpf.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <time.h>
|
|
#include <signal.h>
|
|
#include "libbpf.h"
|
|
#include "bpf_load.h"
|
|
#include "perf-sys.h"
|
|
#include "trace_helpers.h"
|
|
|
|
static int pmu_fd;
|
|
|
|
static __u64 time_get_ns(void)
|
|
{
|
|
struct timespec ts;
|
|
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return ts.tv_sec * 1000000000ull + ts.tv_nsec;
|
|
}
|
|
|
|
static __u64 start_time;
|
|
|
|
#define MAX_CNT 100000ll
|
|
|
|
static int print_bpf_output(void *data, int size)
|
|
{
|
|
static __u64 cnt;
|
|
struct {
|
|
__u64 pid;
|
|
__u64 cookie;
|
|
} *e = data;
|
|
|
|
if (e->cookie != 0x12345678) {
|
|
printf("BUG pid %llx cookie %llx sized %d\n",
|
|
e->pid, e->cookie, size);
|
|
return PERF_EVENT_ERROR;
|
|
}
|
|
|
|
cnt++;
|
|
|
|
if (cnt == MAX_CNT) {
|
|
printf("recv %lld events per sec\n",
|
|
MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
|
|
return PERF_EVENT_DONE;
|
|
}
|
|
|
|
return PERF_EVENT_CONT;
|
|
}
|
|
|
|
static void test_bpf_perf_event(void)
|
|
{
|
|
struct perf_event_attr attr = {
|
|
.sample_type = PERF_SAMPLE_RAW,
|
|
.type = PERF_TYPE_SOFTWARE,
|
|
.config = PERF_COUNT_SW_BPF_OUTPUT,
|
|
};
|
|
int key = 0;
|
|
|
|
pmu_fd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
|
|
|
|
assert(pmu_fd >= 0);
|
|
assert(bpf_map_update_elem(map_fd[0], &key, &pmu_fd, BPF_ANY) == 0);
|
|
ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char filename[256];
|
|
FILE *f;
|
|
int ret;
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
|
|
test_bpf_perf_event();
|
|
|
|
if (perf_event_mmap(pmu_fd) < 0)
|
|
return 1;
|
|
|
|
f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r");
|
|
(void) f;
|
|
|
|
start_time = time_get_ns();
|
|
ret = perf_event_poller(pmu_fd, print_bpf_output);
|
|
kill(0, SIGINT);
|
|
return ret;
|
|
}
|