linux-kernel - Re: [RFC] perf script: modify field selection option

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Message-ID: <20171121143629.GB2187@redhat.com>
Date:   Tue, 21 Nov 2017 12:36:29 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     Milian Wolff <milian.wolff@...b.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
        Andi Kleen <ak@...ux.intel.com>,
        David Ahern <dsahern@...il.com>
Subject: Re: [RFC] perf script: modify field selection option

Em Mon, Nov 20, 2017 at 03:21:01PM -0800, Stephane Eranian escreveu:
> On Mon, Nov 20, 2017 at 2:50 PM, Milian Wolff <milian.wolff@...b.com> wrote:
> > On Montag, 20. November 2017 21:53:04 CET Stephane Eranian wrote:
> >> Hi,
> >>
> >> I have been using the perf script -F option on the latest perf and I
> >> find it not very convenient to use. I appreciate the + and - prefix to
> >> field names to add or suppress them. But most of the time, I want to
> >> print only one or two fields and I have to guess which ones are there
> >> by default so I can suppress them. I think there should be a way to
> >> say: start from no fields. I understand why you have default to
> >> maintain compatibility with older perf script but I would like a
> >> syntax to say: remove defaults. For instance:
> >>
> >> $ perf script -F --,+ip,+syms .....
> >>
> >> Where -- would mean drop all defaults.
> >>
> >> Any better suggestions?
> >
> > Isn't `perf script -F ip,sym` what you want? Note the lack of any '+':
> >
> > $ perf script -F ip,sym | head -n 5
> >
> >                   206aad x86_pmu_enable
> >                   380591 ctx_resched
> >                   380b46 __perf_event_enable
> >                   378716 event_function
> >
> Ah, yes, looks like it.
> problem solved then.
> Thanks.

Even more intuitive :-)

- Arnaldo