mirror of https://gitee.com/openkylin/linux.git
40 lines
942 B
C
40 lines
942 B
C
/* Copyright 2016 Netflix, Inc.
|
|
*
|
|
* 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 <linux/version.h>
|
|
#include <linux/ptrace.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <uapi/linux/bpf_perf_event.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
#define MAX_IPS 8192
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__type(key, u64);
|
|
__type(value, u32);
|
|
__uint(max_entries, MAX_IPS);
|
|
} ip_map SEC(".maps");
|
|
|
|
SEC("perf_event")
|
|
int do_sample(struct bpf_perf_event_data *ctx)
|
|
{
|
|
u64 ip;
|
|
u32 *value, init_val = 1;
|
|
|
|
ip = PT_REGS_IP(&ctx->regs);
|
|
value = bpf_map_lookup_elem(&ip_map, &ip);
|
|
if (value)
|
|
*value += 1;
|
|
else
|
|
/* E2BIG not tested for this example only */
|
|
bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST);
|
|
|
|
return 0;
|
|
}
|
|
char _license[] SEC("license") = "GPL";
|