linux-kernel - [PATCH v4 0/4] perf: arm-spe: Decode SPE source and use for perf c2c

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Date:   Fri, 8 Apr 2022 19:53:39 +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 v4 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 the expected behavior of perf c2c on a system with
SPE where lines that are shared among multiple cores show up in perf c2c
output. 

These changes switch to use mem_lvl_num to encode the level information
instead of mem_lvl which is being deprecated, but I haven't found other
users of mem_lvl_num. 

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