linux-kernel - Re: [PATCH] perf parse: Allow names to start with digits

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Date:   Sat, 2 Jul 2022 18:49:31 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     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>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf parse: Allow names to start with digits

Hello,

just making sure my mail didn't get lost -- would anyone have time to
look at this?

I don't mind if it's slow or another solution is taken, I'd just like to
be able to use 9p probes with perf eventually :)

Thanks!

Dominique Martinet wrote on Sun, Jun 12, 2022 at 03:15:08PM +0900:
> Tracepoints can start with digits, although we don't have many of these:
> 
> $ rg -g '*.h' '\bTRACE_EVENT\([0-9]'
> net/mac802154/trace.h
> 53:TRACE_EVENT(802154_drv_return_int,
> ...
> 
> net/ieee802154/trace.h
> 66:TRACE_EVENT(802154_rdev_add_virtual_intf,
> ...
> 
> include/trace/events/9p.h
> 124:TRACE_EVENT(9p_client_req,
> ...
> 
> Just allow names to start with digits too so e.g. perf probe -e '9p:*'
> works
> 
> Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
> ---
>  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 5b6e4b5249cf..4133d6950d29 100644
> --- a/tools/perf/util/parse-events.l
> +++ b/tools/perf/util/parse-events.l
> @@ -211,7 +211,7 @@ 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_*?.\[\]!]*
>  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_*?\.:]+)?