From: Kip Macy <kmacy@eventdriven.org>
To: "Ronald G. Minnich" <rminnich@lanl.gov>
Cc: Steven Hand <Steven.Hand@cl.cam.ac.uk>,
Chengyuan Li <chengyuanli@gmail.com>,
xen-devel@lists.sourceforge.net
Subject: Re: What is machine address?
Date: Thu, 16 Sep 2004 11:33:19 -0700 (PDT) [thread overview]
Message-ID: <20040916113136.A99996@demos.bsdclusters.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0409161112500.11464@pinkish.lanl.gov>
How does Plan 9 efficiently handle a large number fragmented memory
ranges? FreeBSD can do it, but not well enough to eliminate the PA/MA
dichotomy?
-Kip
On Thu, 16 Sep 2004, Ronald G. Minnich wrote:
>
> MA = machine address
> PA = physical address
> VA = virtual
> On Thu, 16 Sep 2004, Steven Hand wrote:
>
> > Physical address = address of a piece of memory used by a guest operating
> > system (starting at 0 and going up to the amount of memory you have in
> > that particular virtual machine).
>
> On real machines, PAs == the real hardware.
>
> On Xen domains, PAs == not real hardware.
> Xen actually virtualize physical addresses, so although the PA range in an
> OS may be linear and contiguous, the underlying MAs are not.
>
> At some point I want to fix up Plan 9 to ignore PAs entirely and just VA
> and MA, but that's for later. The concept of a PA has no real meaning
> anyway at this point, so I see no reason to deal with it.
>
> ron
>
>
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next prev parent reply other threads:[~2004-09-16 18:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-16 8:08 What is machine address? Chengyuan Li
2004-09-16 8:27 ` Steven Hand
2004-09-16 17:14 ` Ronald G. Minnich
2004-09-16 18:33 ` Kip Macy [this message]
2004-09-16 22:43 ` Ronald G. Minnich
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