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

[Andi Kleen]

On Tue, May 02, 2017 at 08:41:47AM +0200, Jiri Olsa wrote:
> On Mon, May 01, 2017 at 12:47:46PM -0700, Andi Kleen wrote:
> > From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> > 
> > 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 pid,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])
> 
> 
> I haven't checked deeply yet, but I'm getting different pids
> with the new syntax, perhaps some mixing with tids column?

Cannot reproduce. Do you have an exact command line?

The patch shouldn't really change any columns.

-Andi