linux-kernel - Re: [patch 0/4] perf_counter tools: support annotation of live kernel modules

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Message-ID: <20090703081556.GA21833@elte.hu>
Date:	Fri, 3 Jul 2009 10:15:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch 0/4] perf_counter tools: support annotation of live
	kernel modules

* Mike Galbraith <efault@....de> wrote:

> > We need to calculate and cache the objdump annotation output 
> > once, but after that it should be pretty fast as we just display 
> > updated counts with the same lines over and over again. No 
> > repeated objdump runs are needed.
> 
> But active files follow symbols, which change on the fly.
> 
> Besides, as mentioned previously, while displayed annotation was 
> very cool, it took a lot of display space.  For me, top with the 
> ability to emit bic-disposable mini-reports would be my primary 
> perf tools usage. I'd only use big brothers when I needed their 
> power/detail.

Ok, then how about putting some sort of interactivity into perf top?

Up and down arrows would allow the walking of the histogram, and 
hitting enter on a symbol would show the annotated function? It 
would be way cool and more usable and more flexible than some 
side-channel for mini-reports.

PowerTop has a lot of good text interactivity code that might be 
reused. (assuming it's under a kernel compatible license?)

There's also the 'tig' tool - an interactive tool to walk Git 
trees/commits. If it's under a compatible license that would be a 
nice place to look for clues too - it has a very mature and 
well-thought-out TUI in my opinion.

	Ingo
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