[Yaffs] Why do I get a "gc prioritised" message?

Hello,

Does anyone know why, when unmounting a YAFFS partition, after reading
from it, I get the following messages?

yaffs block 250 gc prioritised
yaffs block 251 gc prioritised

These messages are generated from a recent YAFFS, CVS checkout. They do
not appear to be a problem but it does slow the performance while
umounting.

Thanks
Allen