[plug] XFree86 - ridiculous memory consumption

[Craig Ringer]

> Depends on the card. I had a 16MB Banshee at one stage which "used 60MB of 
> RAM", and what was really happening was that the 16MB of card memory was 
> being mapped into RAM at three places to get access to it in 3 different 
> ways, so the process was using 12MB plus 3 images of the card.

In that case, the Total memory use should be high but I thought the RSS 
should still be at 12mb (the actual physical RAM in use). It certainly 
shouldn't "use" real RAM. Or have I misunderstood something?