linux-kernel - Re: LBR callchains from tracepoints

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Message-ID: <20160426190724.GN3430@twins.programming.kicks-ass.net>
Date:	Tue, 26 Apr 2016 21:07:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Milian Wolff <milian.wolff@...b.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: LBR callchains from tracepoints

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.