linux-kernel - Re: [PATCH 0/3] perf top/tui: Fixes for percentage filter behavior

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Date:	Thu, 17 Apr 2014 20:52:58 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 0/3] perf top/tui: Fixes for percentage filter behavior

On Thu, Apr 17, 2014 at 10:38:19PM +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> 2014-04-17 (목), 14:00 +0200, Jiri Olsa:
> > On Thu, Apr 17, 2014 at 04:53:23PM +0900, Namhyung Kim wrote:
> > > Hi,
> > > 
> > > This is a small fixes for a bug in perf top I found during some tests.
> > > It gets segfault if symbol filter found no entries - accessing NULL
> > > pointer in that case.
> > 
> > yep, I hit that yesterday as well, but I ended up just with
> > the patch below, your changes seems more comprehensive ;-)
> > going to review..
> 
> Well, the end result will be same, but I think it should have 0
> nr_entries when there's no entry to show.

also I hit another issue ;-)

- running report on data with callchains, and the screen is populated to the middle
- press 'END' key and the cursor goes to the bottom of the screen (I can tell based
  on the scrollbar), but there are no entries

I could make the cursor appear by pressing UP arrow, I bisected to:
  f214833 perf report: Add --percentage option

not sure where's the problem

thanks,
jirka
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