linux-kernel - [PATCH V2 0/3] perf intel-pt: Add PEBS-via-PT side-band

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Message-Id: <20210701131732.31602-1-adrian.hunter@intel.com>
Date:   Thu,  1 Jul 2021 16:17:29 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
        Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 0/3] perf intel-pt: Add PEBS-via-PT side-band

Hi

PEBS output to Intel Processor Trace was introduced with Atom
processors based on Tremont.  Currently there is software support
only for a single PEBS-via-PT event.

Here is support for multiple PEBS-via-PT events.

The first patch is the kernel change which adds a new event,
namely PERF_RECORD_AUX_OUTPUT_HW_ID which contains the counter
index.  That is output when the PEBS-via-PT event is enabled in hardware.
There is an optimization, to report the index only when it changes
for the event.  That will work only so long as all PEBS-via-PT
events are scheduled together, which they are for a recording
session because they are in a single group.

Also no attribute bit is used to select the new event, so a new
kernel is not compatible with older perf tools.  The assumption
being that PEBS-via-PT is sufficiently esoteric that users will not
be troubled by this.

The second patch adds the usual boiler plate to perf tools for
a new event.

The third patch adds support for processing the new event by
perf tool's Intel PT decoder.

Changes in V2:
    perf/x86: Add new event for AUX output counter index
	Use callback from x86_assign_hw_event

Adrian Hunter (3):
      perf/x86: Add new event for AUX output counter index
      perf tools: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID
      perf intel-pt: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID

 arch/x86/events/core.c                     |  6 +++
 arch/x86/events/intel/core.c               |  7 +++
 arch/x86/events/perf_event.h               |  1 +
 include/linux/perf_event.h                 |  1 +
 include/uapi/linux/perf_event.h            | 15 ++++++
 kernel/events/core.c                       | 30 +++++++++++
 tools/include/uapi/linux/perf_event.h      | 15 ++++++
 tools/lib/perf/include/perf/event.h        |  6 +++
 tools/perf/Documentation/perf-intel-pt.txt |  7 ++-
 tools/perf/builtin-inject.c                |  4 +-
 tools/perf/builtin-record.c                |  2 +-
 tools/perf/util/event.c                    | 18 +++++++
 tools/perf/util/event.h                    |  5 ++
 tools/perf/util/intel-pt.c                 | 85 ++++++++++++++++++++++++++++--
 tools/perf/util/machine.c                  | 10 ++++
 tools/perf/util/machine.h                  |  2 +
 tools/perf/util/session.c                  |  5 ++
 tools/perf/util/tool.h                     |  1 +
 18 files changed, 213 insertions(+), 7 deletions(-)

Regards
Adrian