RE: [Xen-devel] map memory holes with same page

To:	James Harper <james.harper@xxxxxxxxxxxxxxxx>, Keir Fraser <keir.xen@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] map memory holes with same page
From:	Paul Durrant <Paul.Durrant@xxxxxxxxxx>
Date:	Mon, 23 May 2011 09:42:51 +0100
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Cc:	Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
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Thread-topic:	[Xen-devel] map memory holes with same page

> -----Original Message-----
[snip]
> 
> Should there be a performance impact if Windows tries to touch a
> page that I have previously given pack with decrease_reservation?
> Will that invoke the PoD sweep?
> 

No. The p2m entry will be 'invalid', not 'PoD'. IIRC the sweep should only be 
invoked if the cache is exhausted when trying to fix up a PoD entry.

  Paul

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RE: [Xen-devel] map memory holes with same page