TTM's role in score-based eviction

[Lauri Kasanen]

On Mon, 9 Dec 2013 23:45:12 +0100
Marek Olšák <maraeo at gmail.com> wrote:

> > Note that the hotness calculation will be in userspace, as only there
> > are the necessary counters available. So the finished hotness score
> > will be passed to the kernel, instead of sending all the necessary data
> > there. Ought to be less context switches that way.
> 
> This sounds good, but you will also need to update the DDX for
> everything up to and including Cayman. Hopefully the DDX doesn't emit
> IBs outside of glamor on Southern Islands and later chips.

Do you mean to pass an empty score (0) for 2d buffers, or that 2d
buffers should also get the calculation? I suppose this depends on
which ioctl is used to pass it.

IMHO for 2d use the current behavior is ok, so passing a dummy value
and falling back should be enough.

- Lauri