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

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Message-ID: <20090703085344.GB4933@nowhere>
Date:	Fri, 3 Jul 2009 10:53:45 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	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, Jul 03, 2009 at 10:28:44AM +0200, Mike Galbraith wrote:
> 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


The same interactivity could also apply to perf report, by dynamically
expanding callchains, linking to more details with annotate, etc...

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