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From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org, jolsa@redhat.com,
	adrian.hunter@intel.com, kan.liang@linux.intel.com,
	alexander.shishkin@linux.intel.com
Subject: Re: [PATCH 0/2] perf, intel: Add support for PEBS output to Intel PT
Date: Fri, 03 May 2019 11:57:43 +0300	[thread overview]
Message-ID: <87o94jykxk.fsf@ashishki-desk.ger.corp.intel.com> (raw)
In-Reply-To: <20190502105022.15534-1-alexander.shishkin@linux.intel.com>

Alexander Shishkin <alexander.shishkin@linux.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

  parent reply	other threads:[~2019-05-03  8:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-02 10:50 Alexander Shishkin
2019-05-02 10:50 ` [PATCH 1/2] perf: Allow normal events to be sources of AUX data Alexander Shishkin
2019-05-02 10:50 ` [PATCH 2/2] perf/x86/intel: Support PEBS output to PT Alexander Shishkin
2019-05-08  9:12   ` Peter Zijlstra
2019-05-08  9:18   ` Peter Zijlstra
2019-05-08  9:34   ` Peter Zijlstra
2019-05-03  8:57 ` Alexander Shishkin [this message]
2019-05-08 10:39 ` [PATCH 0/2] perf, intel: Add support for PEBS output to Intel PT Peter Zijlstra

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