Question on scrollkeeper-update

[Chris Chabot <chabotc reviewboard com>]

At the end of the gnome-core (1.5.4) compile, it runs

   scrollkeeper-update -p /var/lib/scrollkeeper

This process takes longer then it takes some packes to compile (on my 
compile box anyways), and seems to do no heavy disk IO (according to 
vmstat and 'the human ear listening to the HDs'), and CPU usage is near 0.

What is it doing, and why is it taking so long?

   -- Chris