linux-kernel - Re: [PATCH 2/2] perf top: Handle 'z' key for toggle zeroing samples in TUI

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Date:	Wed, 13 Aug 2014 17:37:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Namhyung Kim <namhyung@...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>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 2/2] perf top: Handle 'z' key for toggle zeroing samples
 in TUI

Em Wed, Aug 13, 2014 at 01:07:30AM +0200, Stephane Eranian escreveu:
> On Tue, Aug 12, 2014 at 10:16 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> > The perf top TUI lacks 'z' key support to toggle sample zeroing.
> > Add it.
> >
> Works for me.
> Tested-by: Stephane Eranian <eranian@...gle.com>

One thing that can be improved: Make it trigger a refresh in the right
after 'z' is pressed.

Also, this toggles the zeroing before each sample, it would be nice to
have a visual cue that this is in effect, probably in the first line in
the screen, perhaps on the far right, something like [z] when this is in
effect and nothing when not.

Right now the way to figure this out is to observe the number of
samples, if it increases monotonically, zeroing before refresh is not in
effect, if it goes from a high number to a smaller or vice versa,
zeroing is in effect :-)

Anyway, applied, people wanting this feature can figure this out, what I
suggested is just polishing.

Thanks!

- Arnaldo
 
> > Reported-by: Stephane Eranian <eranian@...gle.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/ui/browsers/hists.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> > index 045c1e16ac59..381c085a41b8 100644
> > --- a/tools/perf/ui/browsers/hists.c
> > +++ b/tools/perf/ui/browsers/hists.c
> > @@ -10,6 +10,7 @@
> >  #include "../../util/pstack.h"
> >  #include "../../util/sort.h"
> >  #include "../../util/util.h"
> > +#include "../../util/top.h"
> >  #include "../../arch/common.h"
> >
> >  #include "../browser.h"
> > @@ -1530,6 +1531,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
> >         "P             Print histograms to perf.hist.N\n"
> >         "t             Zoom into current Thread\n"
> >         "V             Verbose (DSO names in callchains, etc)\n"
> > +       "z             Toggle zeroing of samples\n"
> >         "/             Filter symbol by name";
> >
> >         if (browser == NULL)
> > @@ -1630,6 +1632,13 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
> >                 case 'F':
> >                         symbol_conf.filter_relative ^= 1;
> >                         continue;
> > +               case 'z':
> > +                       if (!is_report_browser(hbt)) {
> > +                               struct perf_top *top = hbt->arg;
> > +
> > +                               top->zero = !top->zero;
> > +                       }
> > +                       continue;
> >                 case K_F1:
> >                 case 'h':
> >                 case '?':
> > --
> > 2.0.0
> >
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