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SubjectRe: [PATCH v6 04/12] Add memory slot versioning and use it to provide fast guest write interface
  On 10/07/2010 06:03 PM, Gleb Natapov wrote:
> > >
> > > Isn't SET_USER_MEMORY_REGION so slow that calling it 2^32 times
> > > isn't really feasible?
> >
> > Assuming it takes 1ms, it would take 49 days.
> >
> We may fail ioctl when max value is reached. The question is how much slot
> changes can we expect from real guest during its lifetime.
>

A normal guest has a 30 Hz timer for reading the vga framebuffer,
multiple slots. Let's assume 100 Hz frequency, that gives 490 days
until things stop working.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.



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