linux-kernel - [PATCH v3 0/4] perf arm-spe: Track pid/tid for Arm SPE samples

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Date:   Thu, 11 Nov 2021 13:36:21 +0000
From:   German Gomez <german.gomez@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     German Gomez <german.gomez@....com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 0/4] perf arm-spe: Track pid/tid for Arm SPE samples

The following patchset is an iteration on RFC [1] where pid/tid info is
assigned to the Arm SPE synthesized samples. Two methods of tracking
pids are considered: hardware-based (using Arm SPE CONTEXT packets), and
context-switch events (from perf) as fallback.

  - Patch #1 enables pid tracking using RECORD_SWITCH* events from perf.
  - Patch #2 updates perf-record documentation and arm-spe recording so
    that they are consistent.
  - Patch #3 saves the value of SPE CONTEXT packet to the arm_spe_record
    struct.
  - Patch #4 enables hardware-based pid tracking using SPE CONTEXT
    packets.

---

Changes since v2:

  - [PATCH 4/4] Set pid to '-1' in hardware-based pid&tid tracking.

Changes since v1:

  - [PATCH 1/4] Fix authorship of commit.
  - [PATCH 2/4] (New patch) Updated perf-record docs to reflect the
    behavior of Arm SPE introduced by the previous patch.
  - [PATCH 3/4] update initialization of context_id field to (u64)-1.
  - [PATCH 4/4] Update handling of pid/tid tracking fallback following
    Leo Yan's suggestion. Don't consider per-thread mode on this patch.

[1] https://lore.kernel.org/lkml/f877cfa6-9b25-6445-3806-ca44a4042eaf@arm.com/T/#m8a9890e929d2eab54cd51296837ece5d1a473349

German Gomez (3):
  perf arm-spe: Update --switch-events docs in perf-record
  perf arm-spe: Save context ID in record
  perf arm-spe: Support hardware-based PID tracing

Namhyung Kim (1):
  perf arm-spe: Track task context switch for cpu-mode events

 tools/perf/Documentation/perf-record.txt      |   2 +-
 tools/perf/arch/arm64/util/arm-spe.c          |   8 +-
 .../util/arm-spe-decoder/arm-spe-decoder.c    |   2 +
 .../util/arm-spe-decoder/arm-spe-decoder.h    |   1 +
 tools/perf/util/arm-spe.c                     | 120 ++++++++++++++----
 5 files changed, 104 insertions(+), 29 deletions(-)

-- 
2.25.1