re: kern/55089: Possible kernel memory leak in radeondrmkms on 9.0

[matthew green <mrg%eterna.com.au@localhost>]

after running with this fix:

   http://mail-index.netbsd.org/source-changes/2021/06/27/msg130457.html

for a few days, i am convinced of two things:

- this was the main cause of leaking that i was seeing.

- unfortunately, it's clearly not the only one.


the leak rate is far less than previously (5-10x less), and the
consumed by "kmem-00192" increases if eg, i run make eg, xterm
very active, so i'm reasonably sure it's still leaking, but after
over 4 days, there are only 13k allocated pages (previously, it
would be at least 100k.)

this is not yet fully confirmed, i need to install a dtrace 
enabled world and dtrace it.


.mrg.