linux-kernel - Re: [PATCH 7/7] perf hists/tui: Count callchain rows separately

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Date:	Wed, 23 Apr 2014 17:07:14 +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 7/7] perf hists/tui: Count callchain rows separately

On Wed, Apr 23, 2014 at 11:57:33PM +0900, Namhyung Kim wrote:
> 2014-04-23 (수), 16:29 +0200, Jiri Olsa:
> > On Wed, Apr 23, 2014 at 04:00:08PM +0900, Namhyung Kim wrote:
> > > When TUI hist browser expands/collapses callchains it accounted number
> > > of callchain nodes into total entries to show.  However this code
> > > ignores filtering so that it can make the cursor go to out of screen.
> > 
> > SNIP
> > 
> > hi,
> > I needed following patch, otherwise following test case would segfault
> > 
> > - record with -g
> > - report - unfold one symbol
> > - search for nonsense
> > 
> > the reason is that after unfolding the symbol the nr_callchain_rows
> > will get some number, which will cause the hist_browser__nr_entries
> > function return (entries != 0) actually (entries == nr_callchain_rows)
> > even if there's no entry passing the filter
> 
> Argh, right..  Thanks for spotting this.  I guess other filters (thread,
> dso) have same problem.
> 
> > 
> > fixing that by unfolding everything after the filter and reseting
> > the nr_callchain_rows number
> 
> Hmm.. I think hists__remove_entry_filter() already folds them so how
> about just setting ->nr_callchain_rows to 0 in hist_browser__reset()
> instead?

ok, sounds good

thanks,
jirka
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