[Xen-devel] Re: [GIT PULL RFC] pvclock cleanups and pvclock vsyscall support

[Avi Kivity <avi@xxxxxxxxxx>]

On 10/18/2009 05:18 PM, Jeremy Fitzhardinge wrote:
> On 10/18/09 15:43, Avi Kivity wrote:
>    
> > On 10/16/2009 04:46 AM, Jeremy Fitzhardinge wrote:
> >      
> > > Care to cook up a patch to implement the kvm bits to make sure it all
> > > works OK for you?
> > >
> > >        
> > I've started to do that, but it occurs to me that we're missing out on
> > NUMA placement by forcing all clocks to be on the same page. OTOH, if
> > the clocks are heavily used, they'll stay in cache, and if not, who
> > cares.
> >      
> Yes, I'd say so.  I'd expect the data to be very close to read-only, so
> the lines should be shared pretty efficiently.
>
>    
There wouldn't be any sharing since each clock is on its own cache 
line.  But the point is valid regardless.
> On the other hand, there's nothing to stop us from moving to multiple
> pages in future (either to support NUMA placement, or just more than 64
> cpus).
>    
I'm already allocating multiple pages, so we'd just need to adjust the 
fixmap.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.


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