linux-kernel - Re: [PATCH V3 0/1] perf tools: Allow config terms with breakpoints

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Date:   Tue, 6 Jun 2023 16:22:18 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V3 0/1] perf tools: Allow config terms with breakpoints

Em Tue, Jun 06, 2023 at 03:15:59PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Jun 06, 2023 at 08:00:33AM +0300, Adrian Hunter escreveu:
> > On 25/05/23 11:29, Adrian Hunter wrote:
> > > Hi
> > > 
> > > Here is a patch (V3) to the event parser for breakpoint events.
> > > I am not that familiar with flex / bison, but it seemed to
> > > need trailing context to stop the mem event colon and slash
> > > delimiters from getting mixed up with delimiters for config
> > > terms or event modifiers.  Please look closely at that.
> > > 
> > > 
> > > Changes in V3:
> > > 
> > >       Add Ian's Reviewed-by
> > >       Re-base
> > 
> > Still applies.  Any more comments?
> 
> Tried it now, twice, once after removing the O= build dir:
> 
>   CC      /tmp/build/perf-tools-next/tests/event-times.o
>   CC      /tmp/build/perf-tools-next/tests/expr.o
>   BISON   /tmp/build/perf-tools-next/util/parse-events-bison.c
> util/parse-events.y:508.24-34: warning: unused value: $3 [-Wother]
>   508 | PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config
>       |                        ^~~~~~~~~~~
> util/parse-events.y:508.45-55: warning: unused value: $5 [-Wother]
>   508 | PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config
>       |                                             ^~~~~~~~~~~
> util/parse-events.y:526.24-34: warning: unused value: $3 [-Wother]
>   526 | PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE opt_event_config
>       |                        ^~~~~~~~~~~
> util/parse-events.y:543.24-34: warning: unused value: $3 [-Wother]
>   543 | PE_PREFIX_MEM PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config
>       |                        ^~~~~~~~~~~
>   CC      /tmp/build/perf-tools-next/tests/backward-ring-buffer.o

But it doesn't _break_ the build, just warns thiis when generating the
.c file, the next build it notices it is already generated, no warnings.

- Arnaldo
 
> 
> ⬢[acme@...lbox perf-tools-next]$ cat /etc/redhat-release
> Fedora release 36 (Thirty Six)
> 
> ⬢[acme@...lbox perf-tools-next]$ rpm -q bison
> bison-3.8.2-2.fc36.x86_64
> ⬢[acme@...lbox perf-tools-next]$ rpm -q flex
> flex-2.6.4-10.fc36.x86_64
> ⬢[acme@...lbox perf-tools-next]$
> 
> 
> - Arnaldo
>  
> > > 
> > > Changes in V2:
> > > 
> > >       Add comments to tools/perf/util/parse-events.l
> > >       Add a test for 2 mem events back to back with config terms
> > > 
> > > 
> > > Adrian Hunter (1):
> > >       perf tools: Allow config terms with breakpoints
> > > 
> > >  tools/perf/tests/parse-events.c | 157 ++++++++++++++++++++++++++++++++++++++++
> > >  tools/perf/util/parse-events.c  |  23 +++++-
> > >  tools/perf/util/parse-events.h  |   6 +-
> > >  tools/perf/util/parse-events.l  |  23 +++++-
> > >  tools/perf/util/parse-events.y  |  42 ++++++-----
> > >  5 files changed, 224 insertions(+), 27 deletions(-)
> > > 
> > > 
> > > Regards
> > > Adrian
> > 
> 
> -- 
> 
> - Arnaldo

-- 

- Arnaldo