![Alexei Starovoitov](/assets/img/avatar_default.png)
Introduce BPF_PROG_TYPE_PERF_EVENT programs that can be attached to HW and SW perf events (PERF_TYPE_HARDWARE and PERF_TYPE_SOFTWARE correspondingly in uapi/linux/perf_event.h) The program visible context meta structure is struct bpf_perf_event_data { struct pt_regs regs; __u64 sample_period; }; which is accessible directly from the program: int bpf_prog(struct bpf_perf_event_data *ctx) { ... ctx->sample_period ... ... ctx->regs.ip ... } The bpf verifier rewrites the accesses into kernel internal struct bpf_perf_event_data_kern which allows changing struct perf_sample_data without affecting bpf programs. New fields can be added to the end of struct bpf_perf_event_data in the future. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
19 lines
483 B
C
19 lines
483 B
C
/* Copyright (c) 2016 Facebook
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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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#ifndef _UAPI__LINUX_BPF_PERF_EVENT_H__
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#define _UAPI__LINUX_BPF_PERF_EVENT_H__
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#include <linux/types.h>
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#include <linux/ptrace.h>
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struct bpf_perf_event_data {
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struct pt_regs regs;
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__u64 sample_period;
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};
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#endif /* _UAPI__LINUX_BPF_PERF_EVENT_H__ */
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