linux-kernel - Re: [PATCH 09/14] perf diff: Update perf diff documentation for multiple data comparison

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Date:	Thu, 29 Nov 2012 20:52:18 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 09/14] perf diff: Update perf diff documentation for multiple data comparison

On Wed, 28 Nov 2012 14:52:44 +0100, Jiri Olsa wrote:
> +COMPARISON
> +----------
> +The comparison is governed by the baseline file. The baseline perf.data
> +file is iterated for samples. All other perf.data files specified on
> +the command line are searched for the baseline sample pair. If the pair
> +is found, specified computation is made and result is displayed.
> +
> +All samples from non-baseline perf.data files, that do not match any
> +baseline entry, are displayed with empty space within baseline column
> +and possible computation results (delta) in their related column.
> +
> +Example files samples:
> +- file A with samples f1, f2, f3, f4,    f6
> +- file B with samples     f2,     f4, f5
> +- file C with samples f1, f2,         f5
> +
> +Example output:
> +  x - computation takes place for pair
> +  b - baseline sample percentage
> +
> +- perf diff A B C
> +
> +  baseline/A compute/B compute/C  samples
> +  ---------------------------------------
> +  b                    x          f1
> +  b          x         x          f2
> +  b                               f3
> +  b          x                    f4
> +  b                               f6
> +             x         x          f5
> +
> +- perf diff B A C
> +
> +  baseline/B compute/A compute/C  samples
> +  ---------------------------------------
> +  b          x         x          f2
> +  b          x                    f4
> +  b                    x          f5
> +             x         x          f1
> +             x                    f3
> +             x                    f6
> +
> +- perf diff C B A
> +
> +  baseline/C compute/B compute/A  samples
> +  ---------------------------------------
> +  b                    x          f1
> +  b          x         x          f2
> +  b          x                    f5
> +                       x          f3
> +             x         x          f4
> +                       x          f6
> +

It seems not work this way.  When I test multiple diff, I didn't get
consecutive 'b's on the baseline column like your example in the cover
letter of this series.

Thanks,
Namhyung
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