netdev - Re: Reporting bugs and bisection

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Message-ID: <20080416201606.GS1677@cs181133002.pp.htv.fi>
Date:	Wed, 16 Apr 2008 23:16:06 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	sverre@...belier.nl
Cc:	git@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, david@...g.hm,
	Stephen Clark <sclark46@...thlink.net>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tilman Schmidt <tilman@...p.cc>,
	Valdis.Kletnieks@...edu, Mark Lord <lkml@....ca>,
	David Miller <davem@...emloft.net>, jesper.juhl@...il.com,
	yoshfuji@...ux-ipv6.org, jeff@...zik.org, netdev@...r.kernel.org,
	David Newall <davidn@...idnewall.com>
Subject: Re: Reporting bugs and bisection

On Wed, Apr 16, 2008 at 09:39:41PM +0200, Sverre Rabbelier wrote:
> On Wed, Apr 16, 2008 at 3:26 PM, Adrian Bunk <bunk@...nel.org> wrote:
>...
> >  E.g. if you look at commit f743d04dcfbeda7439b78802d35305781999aa11
> >  (ide/legacy/q40ide.c: add MODULE_LICENSE), how could you determine
> >  automatically that it is a bugfix, and the commit that introduced
> >  the bug?
> 
> Well, a dead giveaway would be:
> "http://bugzilla.kernel.org/show_bug.cgi?id=10124"

Which could be "There is no driver for my TV card in the kernel."

> >  You can always get some data, but if you want to get usable statistics
> >  you need explicit tags in the commits, not some algorithm that tries
> >  to guess.
> 
> As said above, I don't agree, you can 'guess' very reliably on a large
> dataset. Also, most commits are already 'tagged' in some way or
> another. The trick is to find the pattern in this tagging and use it.
> 
> I hope this clears things up a bit,

I hope you are aware of the non-technical implications if the results 
don't match reality?

E.g. I am proud that my commits do virtually never introduce bugs, so 
any results someone publishes about what I do should better be right
or my first thoughts are somewhere between "fist" and "lawyer". [1]

> Cheers,
> 
> Sverre Rabbelier

cu
Adrian

[1] my actual reaction might only be an angry email, but I hope you
    get the point that wrong results can really piss off people

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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