linux-kernel - Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Message-Id: <1219826652.30209.12.camel@spike.firmix.at>
Date:	Wed, 27 Aug 2008 10:44:12 +0200
From:	Bernd Petrovitsch <bernd@...mix.at>
To:	Parag Warudkar <parag.lkml@...il.com>
Cc:	Greg Ungerer <gerg@...pgear.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, linux-embedded@...r.kernel.org
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c -
	bisected

On Tue, 2008-08-26 at 22:16 -0400, Parag Warudkar wrote:
[...]
> Well, sure  - but the industry as a whole seems to have gone the other

"The industry as a whole" doesn't exist on that low level. You can't
compare the laptop and/or desktop computer market (where one may buy
today hardware that runs in 3 years with the next generation/release of
the OS and applications) with the e.g. "WLAN router" market where - from
the commercial point of view - every Euro counts (and where the
requirements for the lifetime of the device are long frozen before the
thing gets in a shop).

> way - do more with more at the similar or lower price points!
> By that definition of less is better we should try and make the kernel
> memory pageable (or has someone already done that?) - Windows does it,

That doesn't help as in really small devices (like WLAN routers, cable
modems, etc.) you run without any means of paging/swapping. And even
binaries/read-only files are not necessarily executable in place (but
must be loaded into RAM). So you can't flush these pages.

And pageable kernel memory doesn't come for free - even if one only
counts the increased code and it's complexity.

> by default ;)

Which is more a sign that it is probably a very bad idea.

	Bernd
-- 
Firmix Software GmbH                   http://www.firmix.at/
mobil: +43 664 4416156                 fax: +43 1 7890849-55
          Embedded Linux Development and Services

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