linux-kernel - Re: [PATCH v6 2/3] perf tools: Add lexical definition of event name

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Date:   Mon, 15 Feb 2021 13:34:30 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Shunsuke Nakamura <nakamura.shun@...fujitsu.com>
Cc:     john.garry@...wei.com, will@...nel.org, mathieu.poirier@...aro.org,
        leo.yan@...aro.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/3] perf tools: Add lexical definition of event name

On Fri, Feb 12, 2021 at 06:03:17PM +0900, Shunsuke Nakamura wrote:
> Add the lexical definition of event name so that the numbers are recognizable.
> 
> A64FX defines an event name that starts with a number.
>  - 0inst_commit
>  - 1inst_commit
>  - 2inst_commit
>  - 3inst_commit
>  - 4inst_commit
> 
> Signed-off-by: Shunsuke Nakamura <nakamura.shun@...itsu.com>
> ---
>  tools/perf/util/parse-events.l | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> index 0b36285a9435..33f627187415 100644
> --- a/tools/perf/util/parse-events.l
> +++ b/tools/perf/util/parse-events.l
> @@ -205,7 +205,7 @@ bpf_source	[^,{}]+\.c[a-zA-Z0-9._]*
>  num_dec		[0-9]+
>  num_hex		0x[a-fA-F0-9]+
>  num_raw_hex	[a-fA-F0-9]+
> -name		[a-zA-Z_*?\[\]][a-zA-Z0-9_*?.\[\]]*
> +name		[a-zA-Z0-9_*?\[\]][a-zA-Z0-9_*?.\[\]]*

I can't see anything broken because of this change,
also numbers are defined few lines before so we should
be fine

but please add test for this to tests/parse-events.c,
if you could also add test for 'VALUE:VALUE' event,
that'd be fantastic ;-)

thanks,
jirka

>  name_tag	[\'][a-zA-Z_*?\[\]][a-zA-Z0-9_*?\-,\.\[\]:=]*[\']
>  name_minus	[a-zA-Z_*?][a-zA-Z0-9\-_*?.:]*
>  drv_cfg_term	[a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\.:]+)?
> -- 
> 2.25.1
>