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

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Date:	Fri, 03 Jul 2009 10:28:44 +0200
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	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

On Fri, 2009-07-03 at 10:15 +0200, Ingo Molnar wrote:
> * 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.

Cool.  I love free samples to bend/spindle/mutilate :)

	-Mike

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