Date: Fri, 7 Oct 2016 13:53:57 +0900
From: Namhyung Kim <namhyung@kernel.org>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
CC: <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>, Jiri Olsa <jolsa@kernel.org>
Subject: Re: Scrolling down broken with "perf top --hierarchy"
Message-ID: <20161007045357.GF31113@sejong>
References: <20161006163333.GC308@x4>
 <20161007011753.GA31113@sejong>
 <20161007035118.GA308@x4>
 <20161007042218.GE31113@sejong>
 <20161007043229.GB308@x4>
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Cc-ing perf maintainers,

On Fri, Oct 07, 2016 at 06:32:29AM +0200, Markus Trippelsdorf wrote:
> On 2016.10.07 at 13:22 +0900, Namhyung Kim wrote:
> > On Fri, Oct 07, 2016 at 05:51:18AM +0200, Markus Trippelsdorf wrote:
> > > On 2016.10.07 at 10:17 +0900, Namhyung Kim wrote:
> > > > On Thu, Oct 06, 2016 at 06:33:33PM +0200, Markus Trippelsdorf wrote:
> > > > > Scrolling down is broken when using "perf top --hierarchy".
> > > > > When it starts up everything is OK and one can scroll up and down to all
> > > > > entries. But as further and further new entries get added to the list,
> > > > > scrolling down is blocked (at the position of the last entry that was
> > > > > shown directly after startup).
> > > > 
> > > > I think below patch will fix the problem.  Please check.
> > > 
> > > Yes. It works fine now. Many thanks.
> > 
> > Good.  Can I add your Tested-by then?
> 
> Sure.

Ok, I'll send a formal patch with it.

> 
> (And in the long run you should think of making "perf top --hierarchy"
> the default for perf top, because it gives a much better (uncluttered)
> overview of what is going on.)

I think it's a matter of taste.  Some people prefer to see the top
single function or something (i.e. current behavior) while others
prefer to see a higher-level view.

But we can think again about the default at least for perf-top.  I
worried about changing default behavior because last time we did it
for children mode many people complained about it.  But I do think the
hierarchy mode is useful for many people though.

Hmm.. I thought that it already has a config option to enable hierarch
mode by default, but I cannot find it now.

Thanks,
Namhyung