linux-kernel - Re: [RFC] Sort inclusive

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Message-ID: <20120306065753.GB5100@elte.hu>
Date:	Tue, 6 Mar 2012 07:57:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arun Sharma <asharma@...com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [RFC] Sort inclusive

* Arun Sharma <asharma@...com> wrote:

> Some of our users have been asking for the ability to sort 
> samples by inclusive time (time spent in the function + all of 
> the callees in the callgraph).

If this feature gets mature enough I'd even suggest that we make 
this the default output mode.

( Sidenote: the patched perf_evsel__add_hist_entry() function 
  seems a tad large now, it might make sense to factor out one 
  or two helper inline functions from it and thus clean up the 
  flow all around. )

Btw., assuming that you are profiling user-space applications 
via call-chains, how do you deal with the lack of dwarf decoding 
done by perf, in particular on 64-bit x86 systems where most 
distros don't compile call-chains into libraries and 
application? In what practical situations does that limitation 
hinder you and what do you do about it - rebuild your apps with 
frame pointers included?

Thanks,

	Ingo
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