Ok, thanks for the update :)
Let me know if/when you have some patch to test.
Trying to refresh my memory. The issue was that under Xen, the DRM
modesetting with your radeon card (ES1000) would fail during the
ring buffer initialization. I provided a test-path that made it go
away, but now you get those Free Memory leak.
So is the Memory leak happening after running X for some time or
pretty much immediately?