linux-kernel - Re: [PATCH] perf sort: only insert overhead && overhead

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Date:   Fri, 2 Jun 2017 11:22:57 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     "Du, Changbin" <changbin.du@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf sort: only insert overhead && overhead_children
 when no overhead* field given

On Fri, Jun 02, 2017 at 10:52:24AM +0800, Du, Changbin wrote:
> On Thu, Jun 01, 2017 at 12:21:39PM +0200, Jiri Olsa wrote:
> > On Thu, Jun 01, 2017 at 05:03:21PM +0800, changbin.du@...el.com wrote:
> > > diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> > > index 5762ae4..69eea3a 100644
> > > --- a/tools/perf/util/sort.c
> > > +++ b/tools/perf/util/sort.c
> > > @@ -2635,6 +2635,9 @@ static char *setup_overhead(char *keys)
> > >  	if (sort__mode == SORT_MODE__DIFF)
> > >  		return keys;
> > >  
> > > +	if (strstr(keys, "overhead"))
> > > +		return keys;
> > > +
> > >  	keys = prefix_if_not_in("overhead", keys);
> > 
> > hum, you basicaly do what's at begining of prefix_if_not_in function:
> > 
> > static char *prefix_if_not_in(const char *pre, char *str)
> > {
> >         char *n;
> > 
> >         if (!str || strstr(str, pre))
> >                 return str;
> >         ...
> > 
> Thanks, will change it.
>
Misunderstood your words. This is not equal to prefix_if_not_in.
# perf record -ag
# perf report -s overhead,sym

Samples: 7K of event 'cycles', Event count (approx.): 865138253
  Children      Self  Symbol
  +   26.41%     0.00%  [k] verify_cpu
  +   26.37%     0.04%  [k] cpu_startup_entry
  +   25.93%     0.27%  [k] do_idle
  +   19.88%     0.00%  [k] start_secondary
  ....

'Children' should not be here.

> > 
> > could you please provide the example described in changelog?
> > 
> Will add example cmdline there, Thanks.
> 
> > jirka
> 
> -- 
> Thanks,
> Changbin Du



-- 
Thanks,
Changbin Du

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