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

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Date:   Mon, 20 Nov 2017 23:50:27 +0100
From:   Milian Wolff <milian.wolff@...b.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...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

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

Cheers

-- 
Milian Wolff | milian.wolff@...b.com | Senior Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts