linux-kernel - Re: [PATCH 6/8] perf tools: Add new comm infrastructure

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Date:	Mon, 28 Oct 2013 17:05:30 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 6/8] perf tools: Add new comm infrastructure

On Mon, Oct 28, 2013 at 11:29:12AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Oct 28, 2013 at 09:43:09AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Oct 28, 2013 at 11:12:50AM +0100, Frederic Weisbecker escreveu:
> > > On Mon, Oct 28, 2013 at 06:15:26PM +0900, Namhyung Kim wrote:
> > > > On Mon, 28 Oct 2013 10:09:46 +0100, Frederic Weisbecker wrote:
> > > > > Ah cool! Could you please remind me the name of that branch so that I
> > > > > can do some tests and work on top of it?
> 
> > > >   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> > > >     perf/callchain-v5
> 
> > > Hmm, I tried to rebase on top of tip:perf/core and git is getting confused I guess with
> > > which is applied and which is out of tree. There have been a lot of changes since
> > > then and thus quite some conflicts.
> > > 
> > > If you don't mind, I would love if you rebase against latest tip:perf/core as you
> > > know better than me what has been applied and what hasn't.
>  
> > I'll try to do it now.
> 
> Can you please try with:
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
> 	  perf/comm
> 
> And share your results? I fixed up everything wrt recent flux in my
> perf/core branch, did just basic testing here, but so far it looks ok
> (and fast!).

Ok I tried perf report, perf script and perf top and it looks good.
In fact it looks better than the tip tree. I fixes some bugs that I can
see in tip:/perf/core:

     $ perf record perf bench sched messaging
     $ perf report --stdio -s comm
     write failure on standard output: Bad file descriptor

Not sure where that comes from, but it's fixed in your tree. May be that's
on the fixes before the comm patches in your tree.

Also it differentiate between pre-exec and post-fork events, which looks
more precise (and it fixes some comm mangling as well):


Before:

     # Overhead          Command
     # ........  ...............
     #
       100.00%  sched-me

After:

     # Overhead          Command
     # ........  ...............
     #
        99.89%  sched-messaging
        0.11%             perf


Thanks!
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