linux-kernel - Re: [PATCH V7 1/1] perf tool:perf diff support for different binaries

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Date:	Thu, 26 Feb 2015 12:34:04 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	kan.liang@...el.com, jolsa@...hat.com, namhyung@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 1/1] perf tool:perf diff support for different binaries

> Having a nice explanation of the problem helps, as my first reaction to
> this patch was: "What? This is what this tool is supposed to do, to
> compare two versions of a binary, one that is being developed from the
> same source, the other with slight modifications, etc", while the
> description of the patch made it look as this was a feature that was now
> being introduced.

AFAIK it was actually to compare multiple runs of the same binary
with different setups: e.g. varying number of threads.

However in the Linux kernel development world it turns out comparing
multiple similar binaries is much more useful.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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