/* 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/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";