linux-kernel - [PATCH v4 0/2] perf header: Support HYBRID_TOPOLOGY and HYBRID_CPU_PMU

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Date:   Fri, 14 May 2021 20:29:46 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v4 0/2] perf header: Support HYBRID_TOPOLOGY and HYBRID_CPU_PMU_CAPS

AlderLake uses a hybrid architecture utilizing Golden Cove cores
(core cpu) and Gracemont cores (atom cpu). It would be useful to let user
know the hybrid topology, the HYBRID_TOPOLOGY feature in header indicates
which cpus are core cpus, and which cpus are atom cpus.

On hybrid platform, it may have several cpu pmus, such as, "cpu_core" and
"cpu_atom". The HYBRID_CPU_PMU_CAPS feature in perf header is created to
support multiple cpu pmus.

v4:
---
- Only minor update in '[PATCH v4 2/2] perf header: Support HYBRID_CPU_PMU_CAPS feature'.
  1. Directly return process_per_cpu_pmu_caps() in process_cpu_pmu_caps.
     Remove the variable 'ret'.
  2. Set 'ret = -1' if (!n->pmu_name) in process_hybrid_cpu_pmu_caps().

v3:
---
- For "[PATCH v3 1/2] perf header: Support HYBRID_TOPOLOGY feature",
  update HEADER_HYBRID_TOPOLOGY format in perf.data-file-format.txt.

- For "[PATCH v3 2/2] perf header: Support HYBRID_CPU_PMU_CAPS feature",
  Don't extend the original CPU_PMU_CAPS to support hybrid cpu pmus.
  Instead, create a new feature 'HYBRID_CPU_PMU_CAPS' in header.

v2:
---
- In "perf header: Support HYBRID_TOPOLOGY feature", don't use the n->map
  to print the cpu list, just use n->cpus.

- Separate hybrid CPU_PMU_CAPS support into two patches:
  perf header: Write hybrid CPU_PMU_CAPS
  perf header: Process hybrid CPU_PMU_CAPS

- Add some words to perf.data-file-format.txt for HYBRID_TOPOLOGY and
  hybrid CPU_PMU_CAPS.

Jin Yao (2):
  perf header: Support HYBRID_TOPOLOGY feature
  perf header: Support HYBRID_CPU_PMU_CAPS feature

 .../Documentation/perf.data-file-format.txt   |  33 +++
 tools/perf/util/cputopo.c                     |  80 ++++++
 tools/perf/util/cputopo.h                     |  13 +
 tools/perf/util/env.c                         |  12 +
 tools/perf/util/env.h                         |  16 ++
 tools/perf/util/header.c                      | 249 ++++++++++++++++--
 tools/perf/util/header.h                      |   2 +
 tools/perf/util/pmu-hybrid.h                  |  11 +
 8 files changed, 397 insertions(+), 19 deletions(-)

-- 
2.17.1