linux-kernel - Re: perf top -g -U --sort=symbol --children == lalalalala?

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Date:	Thu, 11 Sep 2014 14:43:12 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf top -g -U --sort=symbol --children == lalalalala?

On Thu, 2014-09-11 at 17:09 +0900, Namhyung Kim wrote: 
> On Tue, Sep 9, 2014 at 10:37 PM, Arnaldo Carvalho de Melo
> <acme@...stprotocols.net> wrote:
> > Em Tue, Sep 09, 2014 at 01:54:01PM +0200, Mike Galbraith escreveu:
> >> Seems the now default on --children thingy doesn't like -U much.
> >
> > Namhyung, can you please take a look at this?
> 
> So what is the problem here?

Well, if you don't see anything wrong, I guess nothing at all.

> >> Samples: 5K of event 'cycles', Event count (approx.): 2268660922
> >>   Children      Self  Symbol
> >> +   46.42%     0.04%  [k] system_call_fastpath

I'll just turn it off until I figure out what cool stuff this is telling
me. why that symbol becomes the number one hit, and why total% > 100.

To me, it looks like top smoked it's breakfast, went to lala land ;-)

-Mike

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