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44 lines
1.1 KiB
44 lines
1.1 KiB
/* Copyright (c) 2016 Sargun Dhillon <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of version 2 of the GNU General Public |
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* License as published by the Free Software Foundation. |
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*/ |
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#include <linux/ptrace.h> |
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#include <uapi/linux/bpf.h> |
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#include <linux/version.h> |
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#include <bpf/bpf_helpers.h> |
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#include <uapi/linux/utsname.h> |
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#include "trace_common.h" |
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struct { |
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__uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); |
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__uint(key_size, sizeof(u32)); |
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__uint(value_size, sizeof(u32)); |
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__uint(max_entries, 1); |
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} cgroup_map SEC(".maps"); |
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struct { |
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__uint(type, BPF_MAP_TYPE_ARRAY); |
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__type(key, u32); |
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__type(value, u64); |
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__uint(max_entries, 1); |
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} perf_map SEC(".maps"); |
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/* Writes the last PID that called sync to a map at index 0 */ |
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SEC("kprobe/" SYSCALL(sys_sync)) |
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int bpf_prog1(struct pt_regs *ctx) |
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{ |
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u64 pid = bpf_get_current_pid_tgid(); |
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int idx = 0; |
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if (!bpf_current_task_under_cgroup(&cgroup_map, 0)) |
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return 0; |
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bpf_map_update_elem(&perf_map, &idx, &pid, BPF_ANY); |
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return 0; |
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} |
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char _license[] SEC("license") = "GPL"; |
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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