[RFC][PATCH 0/7] sched: Optimize sched_clock bits

[Peter Zijlstra]

Hi all,

This series is supposed to optimize the kernel/sched/clock.c and x86
sched_clock() implementations.

So far its only been boot tested. So no clue if it really makes the thing
faster, but it does remove the need to disable IRQs.

I'm hoping Eliezer will test this with his benchmark where he could measure a
performance regression between using sched_clock() and local_clock().

It looks like ia64, the only other CONFIG_HAVE_UNSTABLE_SCHED_CLOCK user,
already matches the new expectations -- mostly not requiring IRQs disabled for
calling sched_clock().

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