[patch] sched-2.5.24-D3, batch/idle priority scheduling, SCHED_BATCH

[Ingo Molnar]

the sched-2.5.24-D3 patch is my current scheduler tree against 2.5.24,
which also includes the latest version of SCHED_BATCH support:

	http://redhat.com/~mingo/O(1)-scheduler/sched-2.5.24-D3

the setbatch utility can be found at:

	http://redhat.com/~mingo/O(1)-scheduler/setbatch.c

Changes relative to the previous SCHED_BATCH patch:

 - fix signal delivery - call the 'kick batch processes' code on UP as
   well.

 - simplify and speed up the batch queue handling code: the expired/active
   queues are merged into a single queue. If a SCHED_BATCH process uses up
   all its timeslices then it is queued to the tail of the batch-queue -
   otherwise it's queued to the head of the batch-queue. This simplifies
   the load-balancer as well.

 - add 'default context-switch locking' if prepare_arch_schedule() is not 
   defined. The majority of architectures thus do not have to define the
   context-switch locking macros.

bug reports, success reports, comments, suggestions are welcome,

	Ingo