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

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Message-ID: <20171121143550.GA2187@redhat.com>
Date:   Tue, 21 Nov 2017 12:35:50 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     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 12:53:04PM -0800, Stephane Eranian escreveu:
> 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.

 $ perf script -F -*,+ip,+syms

But perhaps using a new option and do away with all those prefixes?

- Arnaldo