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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 16 Feb 2021 17:23:18 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Shunsuke Nakamura <nakamura.shun@...fujitsu.com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        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>,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/3] perf tools: Add lexical definition of event name

On Mon, Feb 15, 2021 at 9:34 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> 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 this change makes the syntax ambiguous with numbers
and names. I don't think it's a good idea.

Is it possible to change the event names not having numbers
at the beginning like inst_commit0, inst_commit1 and so on?

Thanks,
Namhyung