Re: [RFC PATCH 0/2] Expose available KVM free memory slot count to help avoid aborts

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On Thu, Jan 27, 2011 at 11:21:47AM +0200, Avi Kivity wrote:
> On 01/26/2011 02:08 PM, Michael S. Tsirkin wrote:
> >>  >
> >>  >I just mean that once you fault you map sptes and then you can use them
> >>  >without exits.  mmio will cause exits each time. Right?
> >>
> >>  The swapper scanning sptes, ksmd, khugepaged, and swapping can all
> >>  cause a page to be unmapped.  Though it should certainly happen with
> >>  a much lower frequency than mmio.
> >
> >Right. That's why I say that sorting by size might not be optimal.
> >Maybe a cache ...
> 
> Why would it not be optimal?
> 
> If you have 16GB RAM in two slots and a few megabytes here and there
> scattered in some slots, you have three orders of magnitudes to
> spare.

Yes but you might not be accessing all that RAM.
Maybe your workset is just tens of megabytes.

> -- 
> error compiling committee.c: too many arguments to function
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