// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include <linux/ptrace.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(int)); __uint(value_size, sizeof(int)); } perf_buf_map SEC(".maps"); SEC("kprobe/sys_nanosleep") int BPF_KPROBE(handle_sys_nanosleep_entry) { int cpu = bpf_get_smp_processor_id(); bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU, &cpu, sizeof(cpu)); return 0; } char _license[] SEC("license") = "GPL";