linux-kernel - [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf c2c

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Date:   Wed, 4 May 2022 18:48:45 +0000
From:   Ali Saidi <alisaidi@...zon.com>
To:     <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <german.gomez@....com>,
        <leo.yan@...aro.org>, <acme@...nel.org>
CC:     <alisaidi@...zon.com>, <benh@...nel.crashing.org>,
        <Nick.Forrington@....com>, <alexander.shishkin@...ux.intel.com>,
        <andrew.kilroy@....com>, <james.clark@....com>,
        <john.garry@...wei.com>, <jolsa@...nel.org>, <kjain@...ux.ibm.com>,
        <lihuafei1@...wei.com>, <mark.rutland@....com>,
        <mathieu.poirier@...aro.org>, <mingo@...hat.com>,
        <namhyung@...nel.org>, <peterz@...radead.org>, <will@...nel.org>
Subject: [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf c2c

When synthesizing data from SPE, augment the type with source information
for Arm Neoverse cores so we can detect situtions like cache line
contention and transfers on Arm platforms. 

This changes enables future changes to c2c on a system with SPE where lines that
are shared among multiple cores show up in perf c2c output. 

Changes in v8:
 * Report NA for both mem_lvl and mem_lvl_num for stores where we have no
   information

Changes in v7:
 * Minor change requested by Leo Yan

Changes in v6:
  * Drop changes to c2c command which will come from Leo Yan

Changes in v5:
  * Add a new snooping type to disambiguate cache-to-cache transfers where
    we don't know if the data is clean or dirty.
  * Set snoop flags on all the data-source cases
  * Special case stores as we have no information on them

Changes in v4:
  * Bring-in the kernel's arch/arm64/include/asm/cputype.h into tools/ 
  * Add neoverse-v1 to the neoverse cores list

Ali Saidi (4):
  tools: arm64: Import cputype.h
  perf arm-spe: Use SPE data source for neoverse cores
  perf mem: Support mem_lvl_num in c2c command
  perf mem: Support HITM for when mem_lvl_num is any

 tools/arch/arm64/include/asm/cputype.h        | 258 ++++++++++++++++++
 .../util/arm-spe-decoder/arm-spe-decoder.c    |   1 +
 .../util/arm-spe-decoder/arm-spe-decoder.h    |  12 +
 tools/perf/util/arm-spe.c                     | 110 +++++++-
 tools/perf/util/mem-events.c                  |  20 +-
 5 files changed, 383 insertions(+), 18 deletions(-)
 create mode 100644 tools/arch/arm64/include/asm/cputype.h

-- 
2.32.0