linux-kernel - Re: [BUG] New Kernel Bugs

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Date:	Fri, 16 Nov 2007 09:20:02 +0100
From:	Romano Giannetti <romanol@...omillas.es>
To:	Daniel Barkalow <barkalow@...ervon.org>
Cc:	Theodore Tso <tytso@....edu>,
	Benoit Boissinot <bboissin@...il.com>, Mark Lord <liml@....ca>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, protasnb@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] New Kernel Bugs

(Cc: trimmed a bit).

On Thu, 2007-11-15 at 11:19 -0500, Daniel Barkalow wrote:
> On Thu, 15 Nov 2007, Theodore Tso wrote:
[...]
> > A full kernel build with everything selected can take good 30 minutes or 
> > more, and that's on a fast dual-core machine with 4gigs of memory and 
> > 7200rpm disk drives. On a slower, memory limited laptop, doing a single 
> > kernel build can take more time than the user has patiences; multiply 
> > that by 7 or 8 build and test boots, and it starts to get tiresome.
> 
> None of this is going to take as long, 

Well, the compile phase can. Especially if the first time you try to
compile the kernel with EXTRAVERSION=`git describe` which force almost a
full rebuild every time...

But the worst problem is that a full recompile, with a distro .config,
will take hours on my 2.66GHz/CoreDuo/1G ram. Trimming down .config is
fundamental to be able to bisect effectively, but it's not an easy thing
to do for an unexperienced user (and a painful one for all the rest of
us). 

What would be an invaluable help would be a tool that generates
a .config with all the modules and subsystems I am using *now*. Should
be possible in principle by parsing KConfig and Makefiles and using as
input the current .config and lsmod... is it possible to map the kernel
object name to the option enabling it?

Romano 

-- 
Sorry for the disclaimer --- ¡I cannot stop it!

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