Re: [PATCH v3 linux-trace 4/8] samples: bpf: simple tracing example in C
From: Alexei Starovoitov
Date: Tue Feb 10 2015 - 00:48:09 EST
On Mon, Feb 9, 2015 at 9:45 PM, Alexei Starovoitov <ast@xxxxxxxxxxxx> 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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