linux-kernel - Re: Patches for REALLY TINY 386 kernels

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Message-ID: <20070718182021.GA3898@one.firstfloor.org>
Date:	Wed, 18 Jul 2007 20:20:21 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jonathan Campbell <jon@...dgrounds.com>,
	linux-kernel@...r.kernel.org, torvalds@...nsmeta.com
Subject: Re: Patches for REALLY TINY 386 kernels

On Wed, Jul 18, 2007 at 08:55:50AM -0700, H. Peter Anvin wrote:
> Andi Kleen wrote:
> > 
> >> Already with these patches I can compile a zImage kernel that is 450kb
> >> large (890kb decompressed)
> > 
> > The important part is not how big the vmlinux is, but how much
> > memory is actually used after boot. 
> > 
> > I expect concentrating some of the dynamic data structures would
> > be more fruitful in fact.
> > 
> 
> Well, how big the vmlinux file is matters if it doesn't fit in memory
> with enough time to get to the phase where it is dumping the init
> sections.  

If you don't have enough memory for a few tens of KB of init sections
you're very unlikely to have enough memory for user space.

-Andi
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