linux-kernel - [RFC 0/6] powerpc/perf: Add json file metric support for the hv

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Date:   Fri, 17 Jan 2020 18:16:14 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     acme@...nel.org, mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        anju@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com,
        ravi.bangoria@...ux.ibm.com, peterz@...radead.org,
        yao.jin@...ux.intel.com, ak@...ux.intel.com, jolsa@...nel.org,
        kan.liang@...ux.intel.com, jmario@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        paulus@...abs.org, namhyung@...nel.org, mpetlan@...hat.com,
        gregkh@...uxfoundation.org, kjain@...ux.ibm.com,
        benh@...nel.crashing.org
Subject: [RFC 0/6] powerpc/perf: Add json file metric support for the hv_24x7 socket/chip level events

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The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.

Patchset adds json file metric support for the hv_24x7 socket/chip level
events. "hv_24x7" pmu interface events needs system dependend parameter
like socket/chip/core. For example, hv_24x7 chip level events needs
specific chip-id to which the data is requested should be added as part
of pmu events.

So to enable JSON file support to "hv_24x7" interface, patchset expose
total number of sockets and chips per-socket details in sysfs
files (sockets, chips) under "/sys/devices/hv_24x7/interface/".

To get sockets and number of chips per sockets, patchset adds a rtas call
with token "PROCESSOR_MODULE_INFO" to get these details. Patchset also
handles partition migration case to re-init these system depended parameters
by adding proper calls in post_mobility_fixup() (mobility.c).

Patch 5 and 6 of the patchset handles perf tool plumbing needed to replace the "?"
character in the metric expression to proper value and hv_24x7 json metric file
for different Socket/chip resources.

Kajol Jain (6):
  powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor
    details
  powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show
    processor details
  Documentation/ABI: Add ABI documentation for chips and sockets
  powerpc/hv-24x7: Handle migration case of lpar for proper system
    information in sysfs
  perf/tools: Enhance JSON/metric infrastructure to handle "?"
  perf/tools/pmu-events/powerpc: Add hv_24x7 socket/chip level metric
    events

 .../sysfs-bus-event_source-devices-hv_24x7    |  14 +++
 arch/powerpc/perf/hv-24x7.c                   |  90 ++++++++++++++
 arch/powerpc/platforms/pseries/mobility.c     |  12 ++
 arch/powerpc/platforms/pseries/pseries.h      |   3 +
 tools/perf/arch/powerpc/util/header.c         |  40 ++++++
 .../arch/powerpc/power9/hv_24x7_metrics.json  |  64 ++++++++++
 tools/perf/util/expr.h                        |   1 +
 tools/perf/util/expr.y                        |  17 ++-
 tools/perf/util/metricgroup.c                 | 117 +++++++++++-------
 tools/perf/util/metricgroup.h                 |   1 +
 tools/perf/util/stat-shadow.c                 |   5 +
 11 files changed, 321 insertions(+), 43 deletions(-)
 create mode 100644 tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json

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2.18.1