linux-kernel - Re: [RFC PATCH v5 3/3] bpf: Introduce function for outputing trace event data

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Message-ID: <55A47D24.5010703@plumgrid.com>
Date:	Mon, 13 Jul 2015 20:08:20 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	He Kuang <hekuang@...wei.com>, rostedt@...dmis.org,
	masami.hiramatsu.pt@...achi.com, acme@...nel.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, namhyung@...nel.org,
	jolsa@...nel.org
CC:	wangnan0@...wei.com, pi3orama@....com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v5 3/3] bpf: Introduce function for outputing trace
 event data

On 7/13/15 6:59 PM, He Kuang wrote:
> There're scenarios that we need an eBPF program to record not only
> kprobe point args, but also the PMU counters, time latencies or the
> number of cache misses between two probe points and other information
> when the probe point is entered.
>
> This patch adds a new trace event to establish infrastruction for bpf to
> output data to perf. Userspace perf tools can detect and use this event
> as using the existing tracepoint events.
>
> New bpf trace event entry in debugfs:
>
>       /sys/kernel/debug/tracing/events/bpf/bpf_output_data
>
> Userspace perf tools detect the new tracepoint event as:
>
>       bpf:bpf_output_data                          [Tracepoint event]
>
> Data in ring-buffer of perf events added to this event will be polled
> out, sample types and other attributes can be adjusted to those events
> directly without touching the original kprobe events.
>
> The bpf helper function gives eBPF program ability to output data as
> perf sample event. This helper simple call the new trace event and
> userspace perf tools can record the BPF ftrace event to collect those
> records.
>
> Signed-off-by: He Kuang<hekuang@...wei.com>

Looks good to me.
Acked-by: Alexei Starovoitov <ast@...mgrid.com>

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