linux-kernel - Re: [PATCH v3 linux-trace 4/8] samples: bpf: simple tracing example in C

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Message-ID: <CAMEtUuyCmO+N2SOTNXfOVnRA59TWsZczPCJBWsB+h0E45NxHPA@mail.gmail.com>
Date:	Mon, 9 Feb 2015 21:47:42 -0800
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 linux-trace 4/8] samples: bpf: simple tracing example
 in C

On Mon, Feb 9, 2015 at 9:45 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
> I thought we already stated that.
> Here is the quote from perf_event.h:
>          *      # The RAW record below is opaque data wrt the ABI
>          *      #
>          *      # That is, the ABI doesn't make any promises wrt to
>          *      # the stability of its content, it may vary depending
>          *      # on event, hardware, kernel version and phase of
>          *      # the moon.
>          *      #
>          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
>
> and this example is reading PERF_SAMPLE_RAW events and
> uses locally defined structs to print them for simplicity.

to underline my point once more:
addition of bpf doesn't change at all what PERF_SAMPLE_RAW already
delivers to user space.
so no new ABIs anywhere.
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