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Re: Status Bits and Super Pages

From: Espen Skoglund
Subject: Re: Status Bits and Super Pages
Date: Thu, 23 Aug 2007 16:09:37 +0100

[Neal H Walfield]
> At Thu, 23 Aug 2007 13:54:56 +0200,
> Marcus Brinkmann wrote:
>> Yes.  However, there is a related problem that you can not unmap
>> selectively.  I vaguely remember that Espen had a selective unmap
>> proposal at some time as a small modification to the L4 X.2
>> interface.  But I don't remember any details.  Whatever that
>> proposal was should also provide an opportunity to do selective
>> status bit checking, shouldn't it?

> I think the problem was that the space had to be identified,
> however, as the original recipient can grant the mapping meaning
> that the mapping now exists in a different space, many complications
> ensue.

Yes.  One solution would be that a mapper always tags all the mappings
it makes so that it can use this tag later upon unmapping.  The tag
can not be changed when granting a page.


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