linux-kernel - [RFC] Add --show-total-period for perf annotate

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Message-ID: <555F3F8A.6000204@suse.cz>
Date:	Fri, 22 May 2015 16:39:06 +0200
From:	Martin Liška <mliska@...e.cz>
To:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: [RFC] Add --show-total-period for perf annotate

Hello.

I've been working on a new feature for perf annotate, which should be able to annotate
instructions with total spent time (compared to percentage usage).

Let's consider following use-case. You want to compare two different compilers
on the same code base and let's assume 90% of wall-time is spent in a single function.
Moreover, let's say that these compilers produce assembly of a totally different size.

In such case, it's very useful to get an approximation of spent time on a bunch of instructions,
which can be compared among other compilers. Otherwise, one has to somehow sum percentages and compare
it to size of a function.

Mail contains my experimental patch.

However, last missing thing is that I need to calculate portion of cycles a function
utilizes. May I ask you for help as perf annotate does not count these portions.

Thanks,
Martin

View attachment "0001-First-semi-working-version.patch" of type "text/x-patch" (6031 bytes)