Re: [PATCH v6 04/12] Add memory slot versioning and use it to providefast guest write interface

[Avi Kivity]

 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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