linux-kernel - Re: [PATCHSET 00/21] perf tools: Add support to accumulate hist periods (v8)

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Date:	Fri, 7 Feb 2014 03:31:10 +0000
From:	Rodrigo Campos <rodrigo@...g.com.ar>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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>,
	Arun Sharma <asharma@...com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCHSET 00/21] perf tools: Add support to accumulate hist
 periods (v8)

On Fri, Feb 07, 2014 at 10:35:02AM +0900, Namhyung Kim wrote:
> 
> Currently the perf enables both of --call-graph and --children when it
> finds callchains in the samples.  While this is useful for TUI or GTK,
> I'm not sure for stdio as it'd consume so much lines.
> 
> It does not handle all kind of cases like event groups and annotations
> yet, but I really want to release it and get reviews.
> 
> You can also get this series on 'perf/cumulate-v8' branch in my tree at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git


I've modified a little your example to link against two libraries dynamically
and see different cases of how is self vs children attributed when running with
"--sort dso" and it seems great.

I've tried simple examples just as: calling a lib1 function that calls lib2
function which uses lot of CPU, calling lib1 function that uses lot of CPU and
also calls lib2 func that uses lot of CPU. And things like that. Probably using
one lib was enough (I first played with only one) as it's a different symbol
from the main, but just in case some weird bug (was really easy) I tested with
two :-)

I might be able to test with more real world scenarios on Saturday, although I'm
sick now and I'm not sure how I will feel :S




Thanks a lot!
Rodrigo
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