Hi Jens,

here is an optimization of the periodic sync_supers tread which
wakes up every 5 seconds no matter what. The optimization is
done against the 'writeback-v12' of your 'linux-2.6-block' tree.

Note, I have VFS/file-systems changes in a decomposed form, but
I folded that all into one patch to avoid flooding the mailing
list with many tiny patches.

What do you think about this?

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)