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Re: [Xen-devel] map memory holes with same page
| To: | Tim Deegan <Tim.Deegan@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] map memory holes with same page |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Mon, 23 May 2011 13:03:34 +0200 |
| Cc: | Keir Fraser <keir.xen@xxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 23 May 2011 04:05:55 -0700 |
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On Mon, May 23, Tim Deegan wrote: > At 09:42 +0100 on 23 May (1306143771), Paul Durrant wrote: > > > -----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. > > But yes, there will be a performance impact because all accesses to the > missing page will be emulated by sending an ioreq to qemu, so it will > run _very_ slowly. Isnt that what I just "fixed" for kdump, the new get_mem_type hvmop? Could that be reused for this Windows issue? Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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