linux-kernel - [PATCH 0/7] perf stat: Make default perf stat command work on Arm big.LITTLE

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Message-Id: <20240813132323.98728-1-james.clark@linaro.org>
Date: Tue, 13 Aug 2024 14:23:08 +0100
From: James Clark <james.clark@...aro.org>
To: irogers@...gle.com,
	linux-perf-users@...r.kernel.org
Cc: James Clark <james.clark@...aro.org>,
	John Garry <john.g.garry@...cle.com>,
	Will Deacon <will@...nel.org>,
	Mike Leach <mike.leach@...aro.org>,
	Leo Yan <leo.yan@...ux.dev>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Yang Jihong <yangjihong1@...wei.com>,
	Ze Gao <zegao2021@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 0/7] perf stat: Make default perf stat command work on Arm big.LITTLE

The important patches are 3 and 5, the rest are tidyups and tests.

I don't think there is any interaction with the other open issues
about the uncore DSU cycles event or JSON/legacy hw event priorities
because only hw events on core PMUs are used for the default
stat command. And also just sharing the existing x86 code works so
no big changes are required.

For patch 3 the weak arch specific symbol has to continue to be used
rather than picking the implementation based on 
perf_pmus__supports_extended_type() like in patch 5. This is because
that function ends up calling evsel__hw_name() itself which results
in recursion. But at least one weak arch_* construct has been removed,
so it's better than nothing.


James Clark (7):
  perf stat: Initialize instead of overwriting clock event
  perf stat: Remove unused default_null_attrs
  perf evsel: Use the same arch_evsel__hw_name() on arm64 as x86
  perf evsel: Remove duplicated __evsel__hw_name() code
  perf evlist: Use hybrid default attrs whenever extended type is
    supported
  perf test: Make stat test work on DT devices
  perf test: Add a test for default perf stat command

 tools/perf/arch/arm64/util/Build   |  1 +
 tools/perf/arch/arm64/util/evsel.c |  7 ++++
 tools/perf/arch/x86/util/evlist.c  | 65 ------------------------------
 tools/perf/arch/x86/util/evsel.c   | 17 +-------
 tools/perf/builtin-stat.c          | 12 ++----
 tools/perf/tests/shell/stat.sh     | 33 ++++++++++++---
 tools/perf/util/evlist.c           | 65 ++++++++++++++++++++++++++----
 tools/perf/util/evlist.h           |  6 +--
 tools/perf/util/evsel.c            | 19 +++++++++
 tools/perf/util/evsel.h            |  2 +-
 10 files changed, 119 insertions(+), 108 deletions(-)
 create mode 100644 tools/perf/arch/arm64/util/evsel.c

-- 
2.34.1