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    SubjectRe: [PATCH net-next] trace_events_filter: conditional trace event (tcp_probe full=0)
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    From: Masami Hiramatsu <mhiramat@kernel.org>
    Date: Tue, 13 Feb 2018 01:29:03 +0900

    > On Mon, 12 Feb 2018 00:08:46 -0500
    > "Md. Islam" <mislam4@kent.edu> wrote:
    >
    >> Recently tcp_probe kernel module has been replaced by trace_event. Old
    >> tcp_probe had full=0 option where it only takes a snapshot only when
    >> congestion window is changed. However I did not find such
    >> functionality in trace_event.
    >
    > Yes, that seems broken to me. You should filter by using perf script or
    > bpf. I'm not so clear about network stack, but it seems that cwnd can be
    > set for each tcp connection. This means "current snd_cwnd" must be stored
    > for each connection.

    'bpf' is definitely the way to do custom stateful things like this.

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