linux-kernel - Re: [PATCH] perf, tools, script: Allow adding and removing fields

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Date:   Tue, 9 May 2017 14:18:25 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools, script: Allow adding and removing fields

On Mon, May 08, 2017 at 09:21:34AM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> With perf script it is common that we just want to add or remove a field.
> Currently this requires figuring out the long list of default fields and
> specifying them first, and then adding/removing the new field.
> 
> This patch adds a new + - syntax to merely add or remove fields,
> that allows more succint and clearer command lines
> 
> For example to remove the comm field from PMU samples:
> 
> Previously
> 
> perf script -F tid,cpu,time,event,sym,ip,dso,period
> 	    0 [000] 504345.383126:          1 cycles:  ffffffff90060c66 native_write_msr ([kernel.kallsyms])
> 
> with the new syntax
> 
> perf script -F -comm
> 	    0 [000] 504345.383126:          1 cycles:  ffffffff90060c66 native_write_msr ([kernel.kallsyms])
> 
> The new syntax cannot be mixed with normal overriding.

so the -F option for 'type:' does not have default set,
and it looks like the +- don't make sense there:

[jolsa@...va perf]$ ./perf script -F hw:+comm | head -3
              ex 
              ex 
              ex 


jirka