From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net
Cc: Rob Landley <rob@landley.net>
Subject: Re: [uml-devel] Curiosity about nested UML invocations...
Date: Sun, 25 Sep 2005 19:59:48 +0200 [thread overview]
Message-ID: <200509251959.49639.blaisorblade@yahoo.it> (raw)
In-Reply-To: <200509241913.24060.rob@landley.net>
On Sunday 25 September 2005 02:13, Rob Landley wrote:
> So what does "nesting level" actually do, anyway?
For TT mode it's needed because, in the virtual address space, host kernel
uses 3G-4G, a normal TT mode UML uses 2.5 G - 3G *, so a nested UML must use
2.0G-2.5G.
* Note: the load address is decided at link time, so this is used even if you
just compile TT mode in. IOW, when you enable TT mode and you try using more
than 512M (actually 480M for various reasons), you'd need HIGHMEM, which is
slow. Disabling TT mode and running SKAS0 is better.
> Trying to run UML from
> within itself (giving the outer invocation mem=128M), I get the following
> error:
> sh-3.00# ./linux rootfstype=hostfs rw init=/bin/sh LD_ASSUME_KERNEL=2.4.1
> Checking for /proc/mm...not found
> Checking for the skas3 patch in the host...found
> UML running in SKAS0 mode
> os_mode_fd: No such file or directory
Strace would be of help, possibly is looking for some file inside /proc
(say /proc/cpuinfo, but it exists, so it must be another one).
> sh-3.00#
> Just playing around, really, but now I'm curious...
> Rob
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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prev parent reply other threads:[~2005-09-25 18:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-25 0:13 [uml-devel] Curiosity about nested UML invocations Rob Landley
2005-09-25 1:25 ` Jeff Dike
2005-09-25 17:59 ` Blaisorblade [this message]
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