Re: [PATCH 22/27] perf tools: Enable --children option by default

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Tue, Jul 29, 2014 at 01:45:48PM +0200, Andres Freund escreveu:
> On 2014-07-29 15:52:46 +0900, Namhyung Kim wrote:
> > Yes, I knew it'd annoy some existing users like you :)

And me :-)

> > But I hoped it'd be useful for new and (at least, some of) old users
> > to see children/ cumulative overheads by default.  If it lies under
> > an option, it wouldn't have a chance to be used by normal users who
> > simply run perf record and report most of time.
 
> By that argument every new feature would need to be enabled by
> default. Which normally isn't what happens.
 
> > If you think it's entirely useless for you cases, you can set it to off
> > using ~/.perfconfig file:

> >   [report]
> >   children = false
 
> Already done that ;).

:-)
 
> The problem is still that I can't use --no-children on older systems, so
> I can't write benchmarking scripts anymore that don't take depend on the
> perf version...
 
> I guess it's too late to argue effectively though :)

yeah, changing the output people are used to in such a big way is not
nice.

Perhaps next time we should instead present a dialog box at 'perf
report' start allowing people to opt-in, having a nice explanation about
why one would want to switch the default while alowing people to say:

[x] No, Thanks

- Arnaldo