linux-kernel - Re: [PATCH 0/2] perf, intel: Add support for PEBS output to Intel PT

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Date:   Fri, 03 May 2019 11:57:43 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        jolsa@...hat.com, adrian.hunter@...el.com,
        kan.liang@...ux.intel.com, alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH 0/2] perf, intel: Add support for PEBS output to Intel PT

Alexander Shishkin <alexander.shishkin@...ux.intel.com> writes:

> Hi Peter,
>
> New PEBS feature: output to Intel PT stream instead of the DS area. It's
> theoretically useful in virtualized environments, where DS area can't be
> used. It's also good for those who are interested in instruction trace for
> context of the PEBS events. As PEBS goes, it can provide LBR context with
> all the branch-related information that PT doesn't provide at the moment.
>
> PEBS records are packetized in the PT stream, so instead of extracting
> them in the PMI, we leave it to the perf tool, because real time PT
> decoding is not practical. Tooling patches are not included, but can be
> found here [1].
>
> Added is an attribute bit 'aux_source' to mean that an event is a source of
> AUX data. This bit enables PEBS output to PT.

Forgot to CC Kan.

Regards,
--
Alex