linux-kernel - Re: [PATCH v1 1/6] perf parse-events: Fixes relating to no

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Message-ID: <c4833297-da67-3337-b3d1-b628b1282a8a@arm.com>
Date:   Tue, 5 Sep 2023 10:39:38 +0100
From:   James Clark <james.clark@....com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/6] perf parse-events: Fixes relating to no_value
 terms



On 02/09/2023 00:39, Ian Rogers wrote:
> A term may have no value in which case it is assumed to have a value
> of 1. It doesn't just apply to alias/event terms so change the
> parse_events_term__to_strbuf assert.
> 
> Commit 99e7138eb789 ("perf tools: Fail on using multiple bits long
> terms without value") made it so that no_value terms could only be for
> a single bit. Prior to commit 64199ae4b8a3 ("perf parse-events: Fix
> propagation of term's no_value when cloning") this missed a test case
> where config1 had no_value.
> 
> Fixes: 64199ae4b8a3 ("perf parse-events: Fix propagation of term's no_value when cloning")
> Signed-off-by: Ian Rogers <irogers@...gle.com>

For the whole set:

Reviewed-by: James Clark <james.clark@....com>

> ---
>  tools/perf/tests/parse-events.c | 2 +-
>  tools/perf/util/parse-events.c  | 2 +-
>  tools/perf/util/parse-events.h  | 4 ++--
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> index d86076d575ed..d47f1f871164 100644
> --- a/tools/perf/tests/parse-events.c
> +++ b/tools/perf/tests/parse-events.c
> @@ -2170,7 +2170,7 @@ static const struct evlist_test test__events[] = {
>  
>  static const struct evlist_test test__events_pmu[] = {
>  	{
> -		.name  = "cpu/config=10,config1,config2=3,period=1000/u",
> +		.name  = "cpu/config=10,config1=1,config2=3,period=1000/u",
>  		.valid = test__pmu_cpu_valid,
>  		.check = test__checkevent_pmu,
>  		/* 0 */
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 68fe2c4ff49f..65608a3cba81 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -2607,7 +2607,7 @@ int parse_events_term__to_strbuf(struct list_head *term_list, struct strbuf *sb)
>  
>  		if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
>  			if (term->no_value) {
> -				assert(term->type_term == PARSE_EVENTS__TERM_TYPE_USER);
> +				assert(term->val.num == 1);
>  				ret = strbuf_addf(sb, "%s", term->config);
>  			} else
>  				ret = strbuf_addf(sb, "%s=%#"PRIx64, term->config, term->val.num);
> diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> index 855b0725c5d4..594e5d2dc67f 100644
> --- a/tools/perf/util/parse-events.h
> +++ b/tools/perf/util/parse-events.h
> @@ -124,8 +124,8 @@ struct parse_events_term {
>  	 */
>  	bool weak;
>  	/**
> -	 * @no_value: Is there no value. TODO: this should really be part of
> -	 * type_val.
> +	 * @no_value: Is there no value. If a numeric term has no value then the
> +	 * value is assumed to be 1. An event name also has no value.
>  	 */
>  	bool no_value;
>  };