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Date: Tue, 26 Apr 2016 21:07:24 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        Stephane Eranian <eranian@google.com>, David Ahern <dsahern@gmail.com>,
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        Ingo Molnar <mingo@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: LBR callchains from tracepoints
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On Tue, Apr 26, 2016 at 03:20:32PM -0300, Arnaldo Carvalho de Melo wrote:
> Yeah, and that already works in perf, its just that it doesn't work from some
> points (PERF_TYPE_SOFTWARE, PERF_TYPE_TRACEPOINT, etc), as described in the
> changeset I mentioned.

Look at it the other way around, it _only_ works for intel cpu events,
_nothing_ else.

There is only a single PMU that supports LBR callgraph thingies, all the
others do not.