linux-kernel - Re: perf regression testing. was Re: [PATCH 1/2] perf symbols: Fix inverted logic for showing kallsyms as the source of symbols

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Date:	Sat, 23 Jan 2010 13:52:54 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: perf regression testing. was Re: [PATCH 1/2] perf symbols: Fix
 inverted logic for showing kallsyms as the source of symbols

Em Sat, Jan 23, 2010 at 08:04:51AM +0100, Ingo Molnar escreveu:
> 
> * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> 
> > Em Fri, Jan 22, 2010 at 05:43:28PM +0100, Mike Galbraith escreveu:
> > > On Fri, 2010-01-22 at 14:35 -0200, Arnaldo Carvalho de Melo wrote:
> > > > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > > 
> > > > Only if we parsed /proc/kallsyms (or a copy found in the buildid cache)
> > > > we should set the dso long name to "[kernel.kallsyms]".
> > > 
> > > Yup, works just as well as my busted one :)
> > 
> > yeah :-)
> > 
> > I'll soon start working on 'perf regtest', to start accumulating regression 
> > tests a la 'perf bench', as these silly bugs are worrying me...
> 
> Excellent, it's much needed!
> 
> The best example i know about is KVM: they have built an impressive regression 
> test suite and add testcases for new regressions all the time.
> 
> The key is to have something simple to run, which developers (and 
> maintainers) can run after every new perf commit or so.

Yes, that is the idea, I'm finishing the first test (/proc/kallsyms
versus what we get from a auto-located vmlinux symtab) and will submit
it soon:

[acme@...pio linux-2.6-tip]$ perf regtest
 1: vmlinux symtab matches kallsyms... 
Segmentation fault
[acme@...pio linux-2.6-tip]$

Not quite working yet, tho :o)

- Arnaldo
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