linux-kernel - [BUG] perf record: GROUP_DESC not supported in pipe mode

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Date:   Mon, 12 Mar 2018 18:06:54 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
        Andi Kleen <ak@...ux.intel.com>
Subject: [BUG] perf record: GROUP_DESC not supported in pipe mode

Hi,

I ran into a problem trying to group events in perf record while in pipe mode.
If I do:

$ perf record --group -e '{cycles, instructions}' -o - | perf report
-i - --group

I do not get the profiles grouped together. Instead I get two profiles.

Looking at the code in util/header.c I see that a bunch of features and not
supported in pipe mode (synthesized method). It is not clear to me why.
Clearly grouping should be supported. This is a very commonly used mode.

Am I missing something?
Thanks.