2015-10-21 11:02:35 +08:00
|
|
|
/* 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>
|
2018-05-15 13:35:02 +08:00
|
|
|
#include <libbpf.h>
|
2015-10-21 11:02:35 +08:00
|
|
|
#include "bpf_load.h"
|
2016-12-09 10:46:19 +08:00
|
|
|
#include "perf-sys.h"
|
2018-04-29 13:28:13 +08:00
|
|
|
#include "trace_helpers.h"
|
2015-10-21 11:02:35 +08:00
|
|
|
|
|
|
|
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
|
|
|
|
|
2018-04-29 13:28:13 +08:00
|
|
|
static int print_bpf_output(void *data, int size)
|
2015-10-21 11:02:35 +08:00
|
|
|
{
|
|
|
|
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);
|
2018-05-11 01:24:40 +08:00
|
|
|
return LIBBPF_PERF_EVENT_ERROR;
|
2015-10-21 11:02:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
cnt++;
|
|
|
|
|
|
|
|
if (cnt == MAX_CNT) {
|
|
|
|
printf("recv %lld events per sec\n",
|
|
|
|
MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
|
2018-05-11 01:24:40 +08:00
|
|
|
return LIBBPF_PERF_EVENT_DONE;
|
2015-10-21 11:02:35 +08:00
|
|
|
}
|
2018-04-29 13:28:13 +08:00
|
|
|
|
2018-05-11 01:24:40 +08:00
|
|
|
return LIBBPF_PERF_EVENT_CONT;
|
2015-10-21 11:02:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
|
2016-12-09 10:46:19 +08:00
|
|
|
pmu_fd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
|
2015-10-21 11:02:35 +08:00
|
|
|
|
|
|
|
assert(pmu_fd >= 0);
|
samples/bpf: Make samples more libbpf-centric
Switch all of the sample code to use the function names from
tools/lib/bpf so that they're consistent with that, and to declare their
own log buffers. This allow the next commit to be purely devoted to
getting rid of the duplicate library in samples/bpf.
Committer notes:
Testing it:
On a fedora rawhide container, with clang/llvm 3.9, sharing the host
linux kernel git tree:
# make O=/tmp/build/linux/ headers_install
# make O=/tmp/build/linux -C samples/bpf/
Since I forgot to make it privileged, just tested it outside the
container, using what it generated:
# uname -a
Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux
# cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/
# ls -la offwaketime
-rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime
# file offwaketime
offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped
# readelf -SW offwaketime_kern.o | grep PROGBITS
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
[ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8
[ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8
[ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4
[ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1
[ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4
# ./offwaketime | head -5
swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106
CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2
Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5
firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13
JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2
#
Signed-off-by: Joe Stringer <joe@ovn.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-12-15 06:43:38 +08:00
|
|
|
assert(bpf_map_update_elem(map_fd[0], &key, &pmu_fd, BPF_ANY) == 0);
|
2015-10-21 11:02:35 +08:00
|
|
|
ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
char filename[256];
|
|
|
|
FILE *f;
|
2018-04-29 13:28:13 +08:00
|
|
|
int ret;
|
2015-10-21 11:02:35 +08:00
|
|
|
|
|
|
|
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();
|
2018-04-29 13:28:13 +08:00
|
|
|
ret = perf_event_poller(pmu_fd, print_bpf_output);
|
|
|
|
kill(0, SIGINT);
|
|
|
|
return ret;
|
2015-10-21 11:02:35 +08:00
|
|
|
}
|