This implements a very basic form of batch scheduling for 2.6.

Get the schedtools from here:
http://freshmeat.net/projects/schedtool/?topic_id=136

to manually specify batch tasks.

kernel compile with the same load
no_load		87.32user 10.74system 1:45.06elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k
normal_load	87.03user 10.62system 3:32.58elapsed 45%CPU (0avgtext+0avgdata 0maxresident)k
niced_load	87.07user 10.72system 1:54.52elapsed 85%CPU (0avgtext+0avgdata 0maxresident)k
batchload	87.00user 10.65system 1:44.75elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k

kernel compiled as batch task
batchrun	88.33user 10.82system 1:45.60elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k