linux-kernel - [PATCH v3 0/4] Add mem_hops field in perf_mem_data

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Date:   Wed,  6 Oct 2021 19:36:50 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, jolsa@...nel.org,
        namhyung@...nel.org, ak@...ux.intel.com
Cc:     linux-perf-users@...r.kernel.org, maddy@...ux.ibm.com,
        atrajeev@...ux.vnet.ibm.com, rnsastry@...ux.ibm.com,
        yao.jin@...ux.intel.com, ast@...nel.org, daniel@...earbox.net,
        songliubraving@...com, kan.liang@...ux.intel.com,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        paulus@...ba.org, kjain@...ux.ibm.com
Subject: [PATCH v3 0/4] Add mem_hops field in perf_mem_data_src structure

Patch set adds a new field called 'mem_hops' in the perf_mem_data_src structure
which can be used to represent intra-node/package or inter-node/off-package
details. This field is of size 3 bits where PERF_MEM_HOPS_{NA, 0..6} value
can be used to present different hop levels data.

Patch 1 of the patch-set adds a comment about current state of
PERF_MEM_LVL_* namespace and remove an extra line present in
perf_mem__lvl_scnprintf function.

Patch 2 & 3 adds tool and kernel side changes to add mem_hops field.

Patch 4 of the patch-set fix the data source encodings to represent
L2.1/L3.1 cache access data for powerpc platform.

Changelog:
v2 -> v3
- Since added field HOPS related to NUMA, update the data presented
  by HOPS_0 to denotes accesses from 'remote core, same node' as
  suggested by Peter Zijlstra.

- Link to the patchset v2: https://lkml.org/lkml/2021/10/5/271

v1 -> v2:
- Rather then adding new macros for L2.1/L3.1 (same chip, different
  core) entries as part of field lvlnum, we are introducing new field
  called 'mem_hops' which can be used to get hops
  level data(intra-chip/package or inter-chip/off-package details).
  As suggested by Peter Zijlstra.

- Using OnChip to denote data accesses from 'another core of same chip'
  is not too clear. Update it to 'remote core, same chip' as pointed by
  Michael Ellerman.

- Update the fix patch of correcting data source encodings to use new
  added field 'mem_hops'

- Link to the patchset v1: https://lkml.org/lkml/2021/9/4/37

Kajol Jain (4):
  perf: Add comment about current state of PERF_MEM_LVL_* namespace and
    remove an extra line
  perf: Add mem_hops field in perf_mem_data_src structure
  tools/perf: Add mem_hops field in perf_mem_data_src structure
  powerpc/perf: Fix data source encodings for L2.1 and L3.1 accesses

 arch/powerpc/perf/isa207-common.c     | 26 +++++++++++++++++++++-----
 arch/powerpc/perf/isa207-common.h     |  2 ++
 include/uapi/linux/perf_event.h       | 19 ++++++++++++++++---
 tools/include/uapi/linux/perf_event.h | 19 ++++++++++++++++---
 tools/perf/util/mem-events.c          | 20 ++++++++++++++++++--
 5 files changed, 73 insertions(+), 13 deletions(-)

-- 
2.26.2