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Re: [PATCH net-next 1/3] perf, events: add non-linear data support for raw records

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On Wed, Jul 13, 2016 at 12:36:17AM +0200, Daniel Borkmann wrote:
> This patch adds support for non-linear data on raw records. It means
> that for such data, the newly introduced __output_custom() helper will
> be used instead of __output_copy(). __output_custom() will invoke
> whatever custom callback is passed in via struct perf_raw_record_frag
> to extract the data into the ring buffer slot.
> 
> To keep changes in perf_prepare_sample() and in perf_output_sample()
> minimal, size/size_head split was added to perf_raw_record that call
> sites fill out, so that two extra tests in fast-path can be avoided.
> 
> The few users of raw records are adapted to initialize their size_head
> and frag data; no change in behavior for them. Later patch will extend
> BPF side with a first user and callback for this facility, future users
> could be things like XDP BPF programs (that work on different context
> though and would thus have a different callback), etc.

Why? What problem are we solving?

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[PATCH net-next 0/3] BPF event output helper improvements Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 00:40 +0200
  [PATCH net-next 3/3] bpf: avoid stack copy and use skb ctx for event output Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 00:40 +0200
  [PATCH net-next 1/3] perf, events: add non-linear data support for raw records Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 00:40 +0200
    Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Peter Zijlstra <peterz@infradead.org> - 2016-07-13 10:00 +0200
      Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 11:30 +0200
        Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Peter Zijlstra <peterz@infradead.org> - 2016-07-13 14:20 +0200
          Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 15:20 +0200
    Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Peter Zijlstra <peterz@infradead.org> - 2016-07-13 15:50 +0200
      Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 16:10 +0200
        Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Peter Zijlstra <peterz@infradead.org> - 2016-07-13 18:50 +0200
          Re: [PATCH net-next 1/3] perf, events: add non-linear data support  for raw records Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 19:00 +0200
  [PATCH net-next 2/3] bpf, perf: split bpf_perf_event_output Daniel Borkmann <daniel@iogearbox.net> - 2016-07-13 00:40 +0200

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