linux-kernel - Re: [PATCH] Add an "-m" option to "perf buildid-list".

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Message-ID: <CAP-5=fXdC_opBmFRY_F5xXwVybnx3aagg3nv54ykfmpwYBknMg@mail.gmail.com>
Date:   Wed, 18 May 2022 21:47:35 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Blake Jones <blakejones@...gle.com>
Cc:     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>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add an "-m" option to "perf buildid-list".

On Tue, May 10, 2022 at 11:13 AM Blake Jones <blakejones@...gle.com> wrote:
>
> Thanks for taking a look at this!
>
> On Tue, May 10, 2022 at 9:46 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> > Em Tue, May 03, 2022 at 02:37:04PM -0700, Blake Jones escreveu:
> > > +-m::
> > > +--modules::
> > > +     Show buildid, start/end text address, and path of kernel and modules.
> >
> > Hi,
> >
> >         Wouldn't it be better to have -m show just modules, name +
> > buildid, then have -v show more verbose info, i.e. the start, end and
> > switch from just the module name to its full path?
> >
> >         Then to get what your patch produces now one would use:
> >
> >         $ perf buildid-list -kmv
> >
> >         That would be more flexible, wdyt?
>
> I'm open to using "-v" like this if you think it would be useful; is
> there a use case you have in mind for the non-verbose mode? For doing
> external symbolization of stack traces, the BuildID isn't useful without
> also knowing the starting and ending addresses.
>
> If "-m" only showed information about modules and not about the kernel,
> then "perf buildid-list -km" (without "-v") would have different output
> formats for the kernel and for the modules. So I'm inclined to have "-m"
> include information about the kernel as well as the modules.
>
> How does that sound?
>
> Blake

Using "-m" sounds okay to me, Arnaldo?

Thanks,
Ian