linux-kernel - Re: [PATCH 5/5] perf diff: Fix support for all --sort combinations

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Date:	Mon, 28 Dec 2009 22:54:29 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 5/5] perf diff: Fix support for all --sort combinations

Em Mon, Dec 28, 2009 at 10:48:36PM -0200, Arnaldo Carvalho de Melo escreveu:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> When we finish creating the hist_entries we _already_ have them sorted "by
> name", in fact by what is in --sort, that is exactly how we can find the pairs
> in perf_session__match_hists as 'comm', 'dso' & 'symbol' all are strings we
> need to find the matches in the baseline session.
> 
> So only do the sort by hits followed by a resort by --sort if we need to find
> the position for shwowing the --displacement of hist entries.
> 
> Now all these modes work correctly:
> 
> Example is a simple 'perf record -f find / > /dev/null' ran twice then followed
> by the following commands:
> 
>   $ perf diff -f --sort comm
>   # Baseline  Delta      Command
>   # ........ ..........  .......
>   #
>        0.00%   +100.00%     find

Dammit, of course this one needs some more love... will work on it
tomorrow, the others, humm, _should_ be right.

Its late, I should be having some rest already, I guess, or whatever
:-)

- Arnaldo
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