linux-kernel - Re: [PATCH v2 0/8] Refactor cpuid and metric table lookup code

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Message-ID: <Zzj2usdkgdyZ9Z8I@x1>
Date: Sat, 16 Nov 2024 16:47:06 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: James Clark <james.clark@...aro.org>
Cc: Ian Rogers <irogers@...gle.com>, Xu Yang <xu.yang_2@....com>,
	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>, 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>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Huacai Chen <chenhuacai@...nel.org>, Bibo Mao <maobibo@...ngson.cn>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	Ben Zong-You Xie <ben717@...estech.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Sandipan Das <sandipan.das@....com>,
	Benjamin Gray <bgray@...ux.ibm.com>,
	Ravi Bangoria <ravi.bangoria@....com>,
	Clément Le Goffic <clement.legoffic@...s.st.com>,
	Yicong Yang <yangyicong@...ilicon.com>,
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
	Dima Kogan <dima@...retsauce.net>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 0/8] Refactor cpuid and metric table lookup code

On Fri, Nov 15, 2024 at 12:43:05PM -0300, Arnaldo Carvalho de Melo wrote:
> On Fri, Nov 15, 2024 at 03:35:55PM +0000, James Clark wrote:
> > 
> > 
> > On 07/11/2024 4:20 pm, Ian Rogers wrote:
> > > Xu Yang <xu.yang_2@....com> reported issues with the system metric
> > > lookup:
> > > https://lore.kernel.org/linux-perf-users/20241106085441.3945502-1-xu.yang_2@nxp.com/
> > > These patches remove a lot of the logic relating CPUIDs to PMUs so
> > > that the PMU isn't part of the question when finding a metric table.
> > > For time reasons, it doesn't go as far as allowing system metrics
> > > without a metric table as a metric table is needed for metrics to
> > > refer to other metrics, and the refactoring of that resolution is a
> > > hassle.
> > > 
> > > Ian Rogers (7):
> > >    perf header: Move is_cpu_online to numa bench
> > >    perf header: Refactor get_cpuid to take a CPU for ARM
> > >    perf arm64 header: Use cpu argument in get_cpuid
> > >    perf header: Avoid transitive PMU includes
> > >    perf header: Pass a perf_cpu rather than a PMU to get_cpuid_str
> > >    perf jevents: Add map_for_cpu
> > >    perf pmu: Move pmu_metrics_table__find and remove ARM override
> > > 
> > > Xu Yang (1):
> > >    perf jevents: fix breakage when do perf stat on system metric
> > > 
> > >   tools/perf/arch/arm64/util/arm-spe.c     | 14 +---
> > >   tools/perf/arch/arm64/util/header.c      | 73 ++++++++++-----------
> > >   tools/perf/arch/arm64/util/pmu.c         | 20 ------
> > >   tools/perf/arch/loongarch/util/header.c  |  4 +-
> > >   tools/perf/arch/powerpc/util/header.c    |  4 +-
> > >   tools/perf/arch/riscv/util/header.c      |  4 +-
> > >   tools/perf/arch/s390/util/header.c       |  6 +-
> > >   tools/perf/arch/x86/util/auxtrace.c      |  3 +-
> > >   tools/perf/arch/x86/util/header.c        |  5 +-
> > >   tools/perf/bench/numa.c                  | 53 +++++++++++++++
> > >   tools/perf/builtin-kvm.c                 |  4 +-
> > >   tools/perf/pmu-events/empty-pmu-events.c | 39 ++++++-----
> > >   tools/perf/pmu-events/jevents.py         | 39 ++++++-----
> > >   tools/perf/pmu-events/pmu-events.h       |  2 +-
> > >   tools/perf/tests/expr.c                  |  5 +-
> > >   tools/perf/util/env.c                    |  4 +-
> > >   tools/perf/util/expr.c                   |  6 +-
> > >   tools/perf/util/header.c                 | 82 ++++++++----------------
> > >   tools/perf/util/header.h                 | 23 +++----
> > >   tools/perf/util/pmu.c                    | 25 --------
> > >   tools/perf/util/pmu.h                    |  2 -
> > >   tools/perf/util/probe-event.c            |  1 +
> > >   22 files changed, 189 insertions(+), 229 deletions(-)
> > > 
> > 
> > Reviewed-by: James Clark <james.clark@...aro.org>
> 
> Thanks for reviewing James, I'm doing a round of tests to push what I
> have in tmp.perf-tools-next to perf-tools-next so that it gets test
> merged on linux-next and later today I'll escape from the holiday and
> take a last look on this series, apply and test.

Applied locally, pushing to tmp.perf-tools-next as I'm still testing the
hwmon case, building it on an 32-bit ARM machine:

processor	: 3
model name	: ARMv7 Processor rev 4 (v7l)
BogoMIPS	: 38.40
Features	: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 4

Hardware	: BCM2835
Revision	: a020d3
Serial		: 00000000783939e0
Model		: Raspberry Pi 3 Model B Plus Rev 1.3

- Arnaldo