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Subjectnull syscall latencies rock in 2.1.5 :)

2.0.21 getpid(): 219 cycles
2.1.5 getpid(): 158 cycles [on a 100MHz P54C+Neptun, hot caches]
^------- read: 1.5 usecs!

this is a 28% improvement! Great work Linus! :)

[ the hardware interrupt gate from ring 3 to ring 0 [and back] itself
accounts for 85 cycles ... really awesome numbers! ]

-- mingo



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