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RE: [Xen-devel] [RFC] i386 highmem assist hypercalls


  • To: "Jan Beulich" <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Thu, 24 Jul 2008 23:00:55 +0800
  • Cc:
  • Delivery-date: Thu, 24 Jul 2008 08:02:16 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcjtkMx0Rm9Sd6bLT/+ucbOKpVt+ywADNW2Q
  • Thread-topic: [Xen-devel] [RFC] i386 highmem assist hypercalls

>From: Jan Beulich
>Sent: 2008年7月24日 21:26
>
>While looking at the origin of very frequently executed hypercalls (as
>usual, kernel builds are what's being measured), I realized 
>that the high
>page accessor functions in Linux would be good candidates to handle
>in the hypervisor - clearing or copying to/from a high page is a pretty
>frequent operation (provided there's enough memory). However, the
>measured results aren't exactly as expected: While the number of
>hypercalls dropped by almost 20%, elapsed real time for the builds

Total hypercall nr, or just original kmap caused hypercall nr?

Thanks,
Kevin

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