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

From: Alexander Shishkin
Date: Fri May 03 2019 - 04:58:15 EST

Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> 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.