voluntary-preempt-2.6.8.1-P5

i've uploaded the -P5 patch:

  http://redhat.com/~mingo/voluntary-preempt/voluntary-pree...

Changes since -P4:

 - increase PERCPU_ENOUGH_ROOM to avoid percpu overflow on SMP.
   (Mark H Johnson)

 - reduce ZAP_BLOCK_SIZE to 16 when vp != 0. This pushes the exit
   latency down to below 100 usecs on Lee Revell's box.

 - added a preempt_count field to /proc/latency_trace. This makes it
   easier to spot IRQ contexts and generally it gives a nice overview of
   how the preemption depth changes. It should also help us debug
   those 900usec weirdnesses related to cpu_idle. (if they still occur)

 - made the tcp packet-queue collapsing dependent on VOLUNTARY_PREEMPT.

 - fixed 10-20 msec latencies triggered by 'netstat', which occur when
   there are lots of sockets on a box.

 - rediffed against 2.6.8.1 for the patch to apply without fuzz

	Ingo
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