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- /* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
- *
- * 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 <linux/version.h>
- #include <bpf/bpf_helpers.h>
- #include <uapi/linux/utsname.h>
- #include "trace_common.h"
- struct {
- __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY);
- __uint(key_size, sizeof(u32));
- __uint(value_size, sizeof(u32));
- __uint(max_entries, 1);
- } cgroup_map SEC(".maps");
- struct {
- __uint(type, BPF_MAP_TYPE_ARRAY);
- __type(key, u32);
- __type(value, u64);
- __uint(max_entries, 1);
- } perf_map SEC(".maps");
- /* Writes the last PID that called sync to a map at index 0 */
- SEC("kprobe/" SYSCALL(sys_sync))
- int bpf_prog1(struct pt_regs *ctx)
- {
- u64 pid = bpf_get_current_pid_tgid();
- int idx = 0;
- if (!bpf_current_task_under_cgroup(&cgroup_map, 0))
- return 0;
- bpf_map_update_elem(&perf_map, &idx, &pid, BPF_ANY);
- return 0;
- }
- char _license[] SEC("license") = "GPL";
- u32 _version SEC("version") = LINUX_VERSION_CODE;
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