From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net, jcb62281@gmail.com
Subject: Re: [uml-devel] SKAS4 design question
Date: Wed, 18 Jan 2006 12:58:34 +0100 [thread overview]
Message-ID: <200601181258.34474.blaisorblade@yahoo.it> (raw)
In-Reply-To: <43CBF532.8020103@gmail.com>
On Monday 16 January 2006 20:34, Jacob Bachmeyer wrote:
> Has any thought been given to making SKAS4 suitably generic that it
> could be used for more than just UML?
Not yet, thoughts welcome.
> PS: If I understand correctly, UML with the current SKAS3 works by
> swapping processes into and out of a single "user" address space.
> I
> propose a system where many distinct "user" address spaces are
> maintained by the kernel and execution is placed whereever the user-mode
> scheduler says.
What you say is not clear, but the most obvious understanding of the above
sentence is that you propose what already happens.
However, SKAS3 and current ideas for SKAS4, with different APIs but similar
semantics, say: implement all guest processes as user-level threads (totally
implemented within UML) with the exception that we allow different address
spaces.
So we have "switch the guest proc to a different address
space" (PTRACE_SWITCH_MM, in arch/i386/kernel/ptrace.c), manipulate with
mmap/munmap/mprotect any of these address spaces, and destroy it (all in
mm/proc_mm.c).
--
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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next prev parent reply other threads:[~2006-01-18 11:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-16 19:34 [uml-devel] SKAS4 design question Jacob Bachmeyer
2006-01-18 11:58 ` Blaisorblade [this message]
2006-01-18 23:52 ` Jacob Bachmeyer
2006-01-19 0:37 ` Blaisorblade
2006-01-19 22:23 ` Jacob Bachmeyer
2006-01-20 16:41 ` Blaisorblade
2006-01-23 19:59 ` Jacob Bachmeyer
2006-01-30 11:09 ` Blaisorblade
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