We have to maintain a dirty bitmap because we don't have a paravirtual
graphics driver. IOW, someone needs to write an Xorg driver.
Ideally, we could just implement a Linux framebuffer device, right?
Well, we took that approach in Xen and that sucks even worse because the
Xorg framebuffer driver doesn't implement any of the optimizations that
the Linux framebuffer supports and the Xorg driver does not provide use
the kernel's interfaces for providing update regions.
Of course, we need to pull in X into the kernel to fix this, right?
Any sufficiently complicated piece of software is going to interact with
a lot of other projects. The solution is not to pull it all into one
massive repository. It's to build relationships and to find ways to
efficiently work with the various communities.
And we're working on this with X. We'll have a paravirtual graphics
driver very soon. There are no magic solutions. We need more
developers working on the hard problems.
Regards,
Anthony Liguori
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