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

[Avi Kivity]

 On 10/07/2010 07:23 PM, Gleb Natapov wrote:
> On Thu, Oct 07, 2010 at 06:20:53PM +0200, Avi Kivity wrote:
> >   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.
> >
> And reading vga framebuffer needs slots changes because of dirty map
> tracking?

Yes.

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/