linux-kernel - Re: [PATCH v1 1/2] perf pmu: Make pmu_alias

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Message-ID: <aQL70qlYohRT7cT8@google.com>
Date: Wed, 29 Oct 2025 22:46:58 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	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>,
	James Clark <james.clark@...aro.org>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1 1/2] perf pmu: Make pmu_alias_terms weak again

Hi Ian,

On Wed, Oct 29, 2025 at 03:26:37PM -0700, Ian Rogers wrote:
> The terms for a json event should be weak so they don't override
> command line options.

Can you please give an example command line and the error?

Thanks,
Namhyung

> 
> Fixes: 84bae3af20d0 ("perf pmu: Don't eagerly parse event terms")
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/pmu.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index d597263fab4f..f14f2a12d061 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -802,6 +802,7 @@ static int pmu_aliases_parse_eager(struct perf_pmu *pmu, int sysfs_fd)
>  static int pmu_alias_terms(struct perf_pmu_alias *alias, struct list_head *terms)
>  {
>  	struct parse_events_terms alias_terms;
> +	struct parse_events_term *term;
>  	int ret;
>  
>  	parse_events_terms__init(&alias_terms);
> @@ -812,6 +813,13 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias, struct list_head *terms
>  		parse_events_terms__exit(&alias_terms);
>  		return ret;
>  	}
> +	list_for_each_entry(term, &alias_terms.terms, list) {
> +		/*
> +		 * Weak terms don't override command line options,
> +		 * which we don't want for implicit terms in aliases.
> +		 */
> +		term->weak = true;
> +	}
>  	list_splice_init(&alias_terms.terms, terms);
>  	parse_events_terms__exit(&alias_terms);
>  	return 0;
> -- 
> 2.51.1.851.g4ebd6896fd-goog
>