linux-kernel - Re: [PATCH v1 0/7] Refactor cpuid and metric table lookup code

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Message-ID: <20241107082807.ipb7xzqvs24tto2e@hippo>
Date: Thu, 7 Nov 2024 17:03:30 +0800
From: Xu Yang <xu.yang_2@....com>
To: Ian Rogers <irogers@...gle.com>
Cc: John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	James Clark <james.clark@...aro.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>,
	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 v1 0/7] Refactor cpuid and metric table lookup code

Hi Ian Rogers,

On Wed, Nov 06, 2024 at 11:15:53PM -0800, 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
> 
>  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                  | 51 +++++++++++++++

Meet error when build perf tool:

  CC      util/levenshtein.o
  CC      tests/mem.o
  CC      util/mmap.o
bench/numa.c: In function ‘is_cpu_online’:
bench/numa.c:550:21: error: storage size of ‘statbuf’ isn’t known
  550 |         struct stat statbuf;
      |                     ^~~~~~~
bench/numa.c:554:13: error: implicit declaration of function ‘stat’; did you mean ‘strcat’? [-Werror=implicit-function-declaration]
  554 |         if (stat(buf, &statbuf) != 0)
      |             ^~~~
      |             strcat
bench/numa.c:578:13: error: implicit declaration of function ‘sysfs__read_str’ [-Werror=implicit-function-declaration]
  578 |         if (sysfs__read_str(buf, &str, &strlen) < 0)
      |             ^~~~~~~~~~~~~~~
bench/numa.c:550:21: error: unused variable ‘statbuf’ [-Werror=unused-variable]
  550 |         struct stat statbuf;
      |                     ^~~~~~~
  CC      tests/cpumap.o
  CC      tests/stat.o

After remove these errors, my issue is disappeared.

Thanks,
Xu Yang

>  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, 187 insertions(+), 229 deletions(-)
> 
> -- 
> 2.47.0.199.ga7371fff76-goog
>