mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 04:06:50 +07:00
39111695b1
Performance test and example of bpf_perf_event_output(). kprobe is attached to sys_write() and trivial bpf program streams pid+cookie into userspace via PERF_COUNT_SW_BPF_OUTPUT event. Usage: $ sudo ./bld_x64/samples/bpf/trace_output recv 2968913 events per sec Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
32 lines
642 B
C
32 lines
642 B
C
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
struct bpf_map_def SEC("maps") my_map = {
|
|
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(u32),
|
|
.max_entries = 2,
|
|
};
|
|
|
|
SEC("kprobe/sys_write")
|
|
int bpf_prog1(struct pt_regs *ctx)
|
|
{
|
|
struct S {
|
|
u64 pid;
|
|
u64 cookie;
|
|
} data;
|
|
|
|
memset(&data, 0, sizeof(data));
|
|
data.pid = bpf_get_current_pid_tgid();
|
|
data.cookie = 0x12345678;
|
|
|
|
bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
|
|
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|